Seismic Response Verification Of Reinforced Concrete Structural Wall Systems

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Seismic Response Verification of Reinforced Concrete Structural Wall Systems

Author : Rodolfo Alvarez Sanchez
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis Seismic Response Verification of Reinforced Concrete Structural Wall Systems by : Rodolfo Alvarez Sanchez

Download or read book Seismic Response Verification of Reinforced Concrete Structural Wall Systems written by Rodolfo Alvarez Sanchez and published by . This book was released on 2020 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete structural walls are frequently used as a lateral load resisting system in buildings. In some buildings affected by relatively recent seismic events, the response of the structural walls, traditionally labeled as excellent, has been somewhat unexpected and deserves attention.This dissertation focuses on enhanced numerical methodologies for the verification of the seismic response, including softening, of reinforced concrete structural wall systems. First, a Truss Model for reinforced concrete coupled structural walls is developed. Bar bond-slip, dowel action, and confining effect of the foundation are considered. Two cyclic tests, on scaled seven-story coupled walls (from literature), are used for validation. It is shown that the compressed wall piers resist most of the base shear force and that the coupling beams at lower levels develop the largest shear forces. Second, using the same benchmark test specimens, two models for the nonlinear cyclic analysis of reinforced concrete coupled walls are developed, i.e., Modified Beam-Truss Model and Enhanced Beam-Truss Model. The role of the strain penetration in diagonally reinforced coupling beams on the hysteretic energy dissipated is studied. It is verified that the computational-efficient proposed models predict well the overall response and the sliding shear failures of coupling beams. Third, the Beam-Truss Model developed in a previous study for the nonlinear cyclic analysis of reinforced concrete components is extended to compute out-of-plane buckling in structural walls. The novel Beam-Truss Model computes accurately the force-displacement responses and the buckling behavior of three test specimens reported in literature used for validation. Finally, the Beam-Truss Model is enhanced to compute the out-of-plane nonlinear shear response of wall piers in the analysis of Core-Wall-Building systems. Using the proposed model and pushover analyses, a comprehensive study on a 14-story archetype Core-Wall building is carried out. It is shown that the in-plane shear response has a large influence on the lateral strength and displacement capacity, whereas the out-of-plane shear response mainly influences the displacement capacity.

Design of Reinforced Concrete Buildings for Seismic Performance

Author : Mark Aschheim
Publisher : CRC Press
ISBN 13 : 1315354810
Total Pages : 622 pages
Book Rating : 4.3/5 (153 download)

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Book Synopsis Design of Reinforced Concrete Buildings for Seismic Performance by : Mark Aschheim

Download or read book Design of Reinforced Concrete Buildings for Seismic Performance written by Mark Aschheim and published by CRC Press. This book was released on 2019-04-05 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: The costs of inadequate earthquake engineering are huge, especially for reinforced concrete buildings. This book presents the principles of earthquake-resistant structural engineering, and uses the latest tools and techniques to give practical design guidance to address single or multiple seismic performance levels. It presents an elegant, simple and theoretically coherent design framework. Required strength is determined on the basis of an estimated yield displacement and desired limits of system ductility and drift demands. A simple deterministic approach is presented along with its elaboration into a probabilistic treatment that allows for design to limit annual probabilities of failure. The design method allows the seismic force resisting system to be designed on the basis of elastic analysis results, while nonlinear analysis is used for performance verification. Detailing requirements of ACI 318 and Eurocode 8 are presented. Students will benefit from the coverage of seismology, structural dynamics, reinforced concrete, and capacity design approaches, which allows the book to be used as a foundation text in earthquake engineering.

Prediction of the Seismic Responses of R/C Frame-coupled Wall Structures

Author : A. E. Aktan
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Prediction of the Seismic Responses of R/C Frame-coupled Wall Structures by : A. E. Aktan

Download or read book Prediction of the Seismic Responses of R/C Frame-coupled Wall Structures written by A. E. Aktan and published by . This book was released on 1982 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Seismic Performance of Slender Reinforced Concrete Structural Walls

Author : Anna C. Birely
Publisher :
ISBN 13 :
Total Pages : 932 pages
Book Rating : 4.:/5 (874 download)

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Book Synopsis Seismic Performance of Slender Reinforced Concrete Structural Walls by : Anna C. Birely

Download or read book Seismic Performance of Slender Reinforced Concrete Structural Walls written by Anna C. Birely and published by . This book was released on 2012 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete structural walls are one of the most common lateral-load resisting systems found in mid-rise buildings. They are stiff and strong, easily incorporated into architectural layouts, and, when well designed and detailed, generally considered to perform well under earthquake loading. However, damage to mid-rise walled buildings in the 2010 Chilean earthquake has reminded the engineering community that structural walls can sustain serious damage and that consequently there is a need to improve understanding of wall performance. Research presented seeks to address this need through experimental testing of slender planar walls and evaluation of performance-assessment tools for performance-based earthquake engineering. Despite the engineering community's reliance on reinforced concrete structural walls, relatively few experimental tests have been done to investigate the seismic performance of modern, code-compliant walls. Those tests that have been conducted provide a limited amount of data to support development of performance-based seismic design tools. To address this lack of data, a large experimental test program was undertaken by researchers at the Universities of Washington, Illinois, and California. As a portion of this program, four large-scale planar (rectangular) walls representative of mid-rise West Coast construction were tested and a large number of data were collected. Data analysis was done to provide improved understanding of earthquake response and performance of rectangular walls and support the validation of numerical models. Collected experimental data included detailed damage data. These data, along with documented damage from previous experimental tests, were used to develop performance-prediction tools. These tools, known as fragility functions, relate engineering demand parameters such as strain, rotation, or drift, to the likelihood of specific damage occurring. Damage sustained by buildings during the 2010 Chile earthquake provided a unique opportunity to evaluate performance-based design tools. Several mid-rise buildings that sustained damage in the earthquake were studied, with a focus on evaluating the fragility functions developed from experimental data and evaluating the ASCE/SEI 31/41 standards for the seismic evaluation of existing structures. Evaluation of the ASCE standards involved the use of both linear and nonlinear models. Results of the building evaluations indicate aspects of the procedures that require improvements.

ASCE Standard, ASCE/SEI, 41-17, Seismic Evaluation and Retrofit of Existing Buildings

Author : American Society of Civil Engineers
Publisher :
ISBN 13 : 9780784414859
Total Pages : 550 pages
Book Rating : 4.4/5 (148 download)

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Book Synopsis ASCE Standard, ASCE/SEI, 41-17, Seismic Evaluation and Retrofit of Existing Buildings by : American Society of Civil Engineers

Download or read book ASCE Standard, ASCE/SEI, 41-17, Seismic Evaluation and Retrofit of Existing Buildings written by American Society of Civil Engineers and published by . This book was released on 2017 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Standard ASCE/SEI 41-17 describes deficiency-based and systematic procedures that use performance-based principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes.

Earthquake-resistant Design Of Masonry Buildings

Author : Miha Tomazevic
Publisher : World Scientific
ISBN 13 : 1783262524
Total Pages : 281 pages
Book Rating : 4.7/5 (832 download)

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Book Synopsis Earthquake-resistant Design Of Masonry Buildings by : Miha Tomazevic

Download or read book Earthquake-resistant Design Of Masonry Buildings written by Miha Tomazevic and published by World Scientific. This book was released on 1999-07-05 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few decades, a considerable amount of experimental and analytical research on the seismic behaviour of masonry walls and buildings has been carried out. The investigations resulted in the development of methods for seismic analysis and design, as well as new technologies and construction systems. After many centuries of traditional use and decades of allowable stress design, clear concepts for limit state verification of masonry buildings under earthquake loading have recently been introduced in codes of practice.Although this book is not a review of the state-of-the-art of masonry structures in earthquake zones, an attempt has been made to balance the discussion on recent code requirements, state-of-the-art methods of earthquake-resistant design and the author's research work, in order to render the book useful for a broader application in design practice. An attempt has also been made to present, in a condensed but easy to understand way, all the information needed for earthquake-resistant design of masonry buildings constructed using traditional systems. The basic concepts of limit state verification are presented and equations for seismic resistance verification of masonry walls of all types of construction, (unreinforced, confined and reinforced) as well as masonry-infilled reinforced concrete frames, are addressed. A method for seismic resistance verification, compatible with recent code requirements, is also discussed. In all cases, experimental results are used to explain the proposed methods and equations.An important part of this book is dedicated to the discussion of the problems of repair, retrofit and rehabilitation of existing masonry buildings, including historical structures in urban centres. Methods of strengthening masonry walls as well as improving the structural integrity of existing buildings are described in detail. Wherever possible, experimental evidence regarding the effectiveness of the proposed strengthening methods is given.

Experiments and Analyses to Study the Seismic Response of Reinforced Concrete Frame-wall Structures with Yielding Columns

Author : Marc Olivier Eberhard
Publisher :
ISBN 13 :
Total Pages : 454 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Experiments and Analyses to Study the Seismic Response of Reinforced Concrete Frame-wall Structures with Yielding Columns by : Marc Olivier Eberhard

Download or read book Experiments and Analyses to Study the Seismic Response of Reinforced Concrete Frame-wall Structures with Yielding Columns written by Marc Olivier Eberhard and published by . This book was released on 1989 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Seismic Design, Testing and Analysis of Reinforced Concrete Wall Buildings

Author : Marios Panagiotou
Publisher :
ISBN 13 :
Total Pages : 247 pages
Book Rating : 4.:/5 (244 download)

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Book Synopsis Seismic Design, Testing and Analysis of Reinforced Concrete Wall Buildings by : Marios Panagiotou

Download or read book Seismic Design, Testing and Analysis of Reinforced Concrete Wall Buildings written by Marios Panagiotou and published by . This book was released on 2008 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large investments have recently been made for the construction of new medium- and high-rise buildings in California. In many cases performance-based designs have been the preferred method for these buildings. A main consideration in performance-based seismic design is the estimation of the likely development of structural and nonstructural damage limit-states given a hazard level. For this type of buildings efficient modeling techniques are required able to compute the response at different performance states. A research work was conducted at University of California San Diego (UCSD) on the i) seismic design, ii) experimental response and iii) computational modeling of medium- and high-rise reinforced concrete wall buildings. In the first part of this work a displacement-based seismic design method for use within performance-based is developed. Capacity design is used to control the mechanism of inelastic deformation. Based on principles of plastic analysis and structural dynamics the new formulation allows the computation of the effects of system overstrength and of the higher modes of response. Equal emphasis is given to displacement, force and acceleration demand parameters. The ground motion destructiveness potential is also determined. Application of the method to reinforced concrete wall buildings is discussed. The method is validated with the experimental response of a full-scale 7 story building. In addition a dual plastic hinge design concept for improving the performance and optimizing the construction of high-rise buildings is presented. The second part presents the experimental research program, with extensive shake table tests, of a full-scale 7-story reinforced concrete wall building slice, that was conducted at UCSD. The base shear coefficient obtained by the proposed method, of the first part of the research work, described above was 50% of that required by the equivalent static method prescribed by the ASCE-7 code. In spite of the reduced amount of longitudinal reinforcing steel, all performance objectives were met. The response of the building was significantly influenced, as expected, by the interaction of the main lateral force resisting wall with other structural elements (kinematic overstrength) and by the higher modes of response. Finally the third part presents a dynamic nonlinear strut-and-tie modeling approach developed for the analysis and evaluation of damage limit-states in reinforced concrete walls. The modeling approach is verified with the response of the UCSD 7-story building test.

Seismic Design of Reinforced Concrete Buildings

Author : Jack Moehle
Publisher : McGraw Hill Professional
ISBN 13 : 0071839453
Total Pages : 783 pages
Book Rating : 4.0/5 (718 download)

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Book Synopsis Seismic Design of Reinforced Concrete Buildings by : Jack Moehle

Download or read book Seismic Design of Reinforced Concrete Buildings written by Jack Moehle and published by McGraw Hill Professional. This book was released on 2014-10-06 with total page 783 pages. Available in PDF, EPUB and Kindle. Book excerpt: Complete coverage of earthquake-resistant concrete building design Written by a renowned seismic engineering expert, this authoritative resource discusses the theory and practice for the design and evaluation of earthquakeresisting reinforced concrete buildings. The book addresses the behavior of reinforced concrete materials, components, and systems subjected to routine and extreme loads, with an emphasis on response to earthquake loading. Design methods, both at a basic level as required by current building codes and at an advanced level needed for special problems such as seismic performance assessment, are described. Data and models useful for analyzing reinforced concrete structures as well as numerous illustrations, tables, and equations are included in this detailed reference. Seismic Design of Reinforced Concrete Buildings covers: Seismic design and performance verification Steel reinforcement Concrete Confined concrete Axially loaded members Moment and axial force Shear in beams, columns, and walls Development and anchorage Beam-column connections Slab-column and slab-wall connections Seismic design overview Special moment frames Special structural walls Gravity framing Diaphragms and collectors Foundations

Seismic Design, Assessment and Retrofitting of Concrete Buildings

Author : Michael N. Fardis
Publisher : Springer Science & Business Media
ISBN 13 : 1402098421
Total Pages : 757 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Seismic Design, Assessment and Retrofitting of Concrete Buildings by : Michael N. Fardis

Download or read book Seismic Design, Assessment and Retrofitting of Concrete Buildings written by Michael N. Fardis and published by Springer Science & Business Media. This book was released on 2009-07-25 with total page 757 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting the historic first European seismic code, this professional book focuses on seismic design, assessment and retrofitting of concrete buildings, with thorough reference to, and application of, EN-Eurocode 8. Following the publication of EN-Eurocode 8 in 2004-05, 30 countries are now introducing this European standard for seismic design, for application in parallel with existing national standards (till March 2010) and exclusively after that. Eurocode 8 is also expected to influence standards in countries outside Europe, or at the least, to be applied there for important facilities. Owing to the increasing awareness of the threat posed by existing buildings substandard and deficient buildings and the lack of national or international standards for assessment and retrofitting, its impact in that field is expected to be major. Written by the lead person in the development of the EN-Eurocode 8, the present handbook explains the principles and rationale of seismic design according to modern codes and provides thorough guidance for the conceptual seismic design of concrete buildings and their foundations. It examines the experimental behaviour of concrete members under cyclic loading and modelling for design and analysis purposes; it develops the essentials of linear or nonlinear seismic analysis for the purposes of design, assessment and retrofitting (especially using Eurocode 8); and gives detailed guidance for modelling concrete buildings at the member and at the system level. Moreover, readers gain access to overviews of provisions of Eurocode 8, plus an understanding for them on the basis of the simple models of the element behaviour presented in the book. Also examined are the modern trends in performance- and displacement-based seismic assessment of existing buildings, comparing the relevant provisions of Eurocode 8 with those of new US prestandards, and details of the most common and popular seismic retrofitting techniques for concrete buildings and guidance for retrofitting strategies at the system level. Comprehensive walk-through examples of detailed design elucidate the application of Eurocode 8 to common situations in practical design. Examples and case studies of seismic assessment and retrofitting of a few real buildings are also presented. From the reviews: "This is a massive book that has no equal in the published literature, as far as the reviewer knows. It is dense and comprehensive and leaves nothing to chance. It is certainly taxing on the reader and the potential user, but without it, use of Eurocode 8 will be that much more difficult. In short, this is a must-read book for researchers and practitioners in Europe, and of use to readers outside of Europe too. This book will remain an indispensable backup to Eurocode 8 and its existing Designers’ Guide to EN 1998-1 and EN 1998-5 (published in 2005), for many years to come. Congratulations to the author for a very well planned scope and contents, and for a flawless execution of the plan". AMR S. ELNASHAI "The book is an impressive source of information to understand the response of reinforced concrete buildings under seismic loads with the ultimate goal of presenting and explaining the state of the art of seismic design. Underlying the contents of the book is the in-depth knowledge of the author in this field and in particular his extremely important contribution to the development of the European Design Standard EN 1998 - Eurocode 8: Design of structures for earthquake resistance. However, although Eurocode 8 is at the core of the book, many comparisons are made to other design practices, namely from the US and from Japan, thus enriching the contents and interest of the book". EDUARDO C. CARVALHO

Numerical Modeling Strategies for Sustainable Concrete Structures

Author : Pierre Rossi
Publisher : Springer Nature
ISBN 13 : 3031077466
Total Pages : 397 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Numerical Modeling Strategies for Sustainable Concrete Structures by : Pierre Rossi

Download or read book Numerical Modeling Strategies for Sustainable Concrete Structures written by Pierre Rossi and published by Springer Nature. This book was released on 2022-06-30 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume highlights the latest advances, innovations, and applications in the field of sustainable concrete structures, as presented by scientists and engineers at the RILEM International Conference on Numerical Modeling Strategies for Sustainable Concrete Structures (SSCS), held in Marseille, France, on July 4-6, 2022. It demonstrates that numerical methods (finite elements, finite volumes, finite differences) are a relevant response to the challenge to optimize the utilization of cement in concrete constructions while checking that these constructions have a lifespan compatible with the stakes of sustainable development. They are indeed accurate tools for an optimized design of concrete constructions, and allow us to consider all types of complexities: for example, those linked to rheological, physicochemical and mechanical properties of concrete, those linked to the geometry of the structures or even to the environmental boundary conditions. This optimization must also respect constraints of time, money, security, energy, CO2 emissions, and, more generally, life cycle more reliably than the codes and analytical approaches currently used. Numerical methods are, undoubtedly, the best calculation tools at the service of concrete eco-construction. The contributions present traditional and new ideas that will open novel research directions and foster multidisciplinary collaboration between different specialists.

Seismic design of reinforced concrete structures for controlled inelastic response design concepts

Author : FIB – International Federation for Structural Concrete
Publisher : FIB - International Federation for Structural Concrete
ISBN 13 : 2883940355
Total Pages : 213 pages
Book Rating : 4.8/5 (839 download)

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Book Synopsis Seismic design of reinforced concrete structures for controlled inelastic response design concepts by : FIB – International Federation for Structural Concrete

Download or read book Seismic design of reinforced concrete structures for controlled inelastic response design concepts written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1997-03-01 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Seismic Response of Vertical Concrete Façade Systems in Reinforced Concrete Prefabricated Buildings

Author : Giovanni Menichini
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Seismic Response of Vertical Concrete Façade Systems in Reinforced Concrete Prefabricated Buildings by : Giovanni Menichini

Download or read book Seismic Response of Vertical Concrete Façade Systems in Reinforced Concrete Prefabricated Buildings written by Giovanni Menichini and published by . This book was released on 2020 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of "non-structural" elements, including the cladding panels for precast RC buildings, plays a key role in the building seismic response. The large damages that occurred in precast RC buildings, during the recent earthquakes in southern Europe were mainly caused by the collapse of the cladding panels. Therefore, is required to revise, to revise the technological and design philosophy the panel-to-structure connection devices in RC precast structures. Starting from these considerations, the main topic of this thesis is the investigation of such connection devices. Deeply understanding the working principle of these systems makes it possible to open a way to solve the problem. The influence of the panels to the global response of precast structure is studied for different types of panel-to-structure connections (two types of hammer-head straps) and panels-tofoundation connections (fixed and rocking panels). Numerical models for the in-plane response of connection devices are developed using both existing experimental data from shaking table test performed by University of Ljubljana and result of new tests carried out at the Structures and Materials Testing Laboratory of University of Florence A new connection device, which better uncouples the in-plane seismic response, is developed and studied analytically and experimentally. The study highlights that traditional devices fail due to their limited in-plane displacement capacity while the new device has much better behaviour. The study showed that in-plane direction was critical for connection compared to the out-of-plane one. It also showed that fixed-base panels provide a better seismic performance of connection devices.

Simple and Complex Models for Nonlinear Seismic Response of Reinforced Concrete Structures

Author : Mehdi Saiidi
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Simple and Complex Models for Nonlinear Seismic Response of Reinforced Concrete Structures by : Mehdi Saiidi

Download or read book Simple and Complex Models for Nonlinear Seismic Response of Reinforced Concrete Structures written by Mehdi Saiidi and published by . This book was released on 1979 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Three-dimensional Seismic Analysis of Reinforced Concrete Wall Buildings at Near-fault Sites

Author : Yuan Jie Lu
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (919 download)

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Book Synopsis Three-dimensional Seismic Analysis of Reinforced Concrete Wall Buildings at Near-fault Sites by : Yuan Jie Lu

Download or read book Three-dimensional Seismic Analysis of Reinforced Concrete Wall Buildings at Near-fault Sites written by Yuan Jie Lu and published by . This book was released on 2014 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation approaches the subject of three-dimensional (3D) seismic analysis of reinforced concrete (RC) wall buildings at near-fault sites by first studying two main problems separately: (1) the characterization of base excitation for buildings located at near-fault sites, and (2) modeling the behavior of RC buildings accurately including inelastic behavior and the failure mode. The dissertation culminates with the 3D response history analysis of two 20-story RC core wall buildings models, including the slabs and columns, subject to a strong near-fault ground motion record. First, the presence and characteristics of multiple pulses [with dominant period TP between 0.5 and 12 s] in historical near-fault ground motion records is studied. An iterative method for extracting multiple strong pulses imbedded in a ground motion is presented. The method is used to extract multiple strong velocity pulses from the fault-normal horizontal component of 40 pulse-like ground motion records from 17 historical earthquakes, with magnitudes ranging from MW6.3 to MW7.9, recorded at a distance less than 10 km from the fault rupture with a peak ground velocity greater than 0.6 m / s. The relationships between the dominant period of the extracted pulses, associated amplitudes, and earthquake magnitude are presented, indicating that the amplitude of the strongest pulses with 1.5 s ≤ TP ≤ 5 s, does not depend significantly on the earthquake magnitude. Next, the effect of soil-foundation-structure interaction (SFSI) for a 20-story core wall building with a caisson foundation subject to single pulse motions is investigated using two-dimensional (2D) nonlinear finite-elements and fiber beam-column elements; nonlinear site effects on the free-field motion and structural response is discussed. The nonlinear site effects for free-field motions result in a de-amplification of peak surface acceleration due to soil yielding, and a maximum of 64% amplification of peak acceleration and velocity of at specific pulse periods for deep soils. SFSI, after removing the nonlinear site effect, has a negligible effect on the maximum value of peak roof acceleration and peak roof drift ratio over the pulse periods considered; however, the effect of the increased flexibility due to SFSI is observed in the peak drift ratio and peak base shear response. A couple of chapters of this dissertation are dedicated to the development and verification of a three-dimensional nonlinear cyclic modelling method for non-planar reinforced concrete walls and slabs. This modeling approached - called the beam-truss model (BTM) - consists of (i) nonlinear Euler-Bernoulli fiber-section beam elements representing the steel and concrete in the vertical and horizontal direction, and (ii) nonlinear trusses representing the concrete in the diagonal directions. The model represents the effects of flexure-shear interaction (FSI) by computing the stress and strains in the horizontal and vertical directions and by considering biaxial effects on the behavior of concrete diagonals. In addition, the BTM explicitly models diagonal compression and tension failures (shear failures) under cyclic or dynamic loading. The BTM is first validated by comparing the experimentally measured and numerically computed response of eight RC walls subjected to static cyclic loading, including two non-planar RC walls under biaxial cyclic loading. Then, the BTM is extended to modeling slabs and validated with a two-bay slab-column specimen. Finally, the BTM is validated by comparing the experimentally measured and numerically computed response and failure mode of a 5-story coupled wall RC building under seismic base excitation. The final chapter presents the 3D response history analysis of two 20-story RC core wall buildings subject to a strong near-fault ground motion record. The 20-story building model includes the RC core wall, post-tensioned slabs, and columns; the core wall and slabs are modeled using the developed BTM while the columns are modeled with fiber-section beam-column elements. The two 20-story RC core wall buildings considered have similar geometry: one is conventionally designed to develop plastic hinging at the base of the core-wall, and the second is designed with a damage resistant structural system that combines two seismic isolation planes. Analysis is conducted using the two horizontal components of the historical TCU52 ground motion recorded 0.7 km from the fault plane of the MW7.6 1999 Chi-chi, Taiwan earthquake. The seismic response and damage of the two buildings is discussed.

Nonlinear Seismic Response of Small Reinforced-concrete Shear Wall Structures

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Nonlinear Seismic Response of Small Reinforced-concrete Shear Wall Structures by :

Download or read book Nonlinear Seismic Response of Small Reinforced-concrete Shear Wall Structures written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper describes dynamic tests on small shear wall structures. The purpose of the tests was to obtain information on the behavior of reinforced concrete structures loaded into their nonlinear range. The small shear wall structures were subjected to classical sine-sweep vibration tests and to generated earthquake records. The results indicate that sine-sweep tests on degrading structures do not yield useful results because of fatigue effects and because steady-state motions cannot be achieved; however, the earthquake tests did yield useful information. From the earthquake tests results, responses were obtained that were plotted on computed linear and nonlinear non-dimensionalized response spectra. For loading within the linear range, the data indicate that the equivalent viscous damping for the test structures is about 12.5%. The test results also indicate that, in general, manipulation of the viscous damping coefficient cannot be used to predict nonlinear behavior. The more significant observation was that the effective stiffness of the shear wall structures, as determined from the dynamic tests, was only about 1/5 to 1/7 of the stiffness calculated using standard calculation methods.

Hybrid Simulation of the Seismic Response of Squat Reinforced Concrete Shear Walls

Author : Catherine Alexandra Whyte
Publisher :
ISBN 13 :
Total Pages : 442 pages
Book Rating : 4.:/5 (839 download)

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Book Synopsis Hybrid Simulation of the Seismic Response of Squat Reinforced Concrete Shear Walls by : Catherine Alexandra Whyte

Download or read book Hybrid Simulation of the Seismic Response of Squat Reinforced Concrete Shear Walls written by Catherine Alexandra Whyte and published by . This book was released on 2012 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most industrial and nuclear facilities rely on reinforced concrete structural walls as their primary seismic lateral-force-resisting components. These walls commonly have an aspect ratio smaller than 0.5 and have a very high stiffness and strength. There is a significant uncertainty regarding the behavior of these walls under earthquake loading, their failure modes, and their expected strengths and deformation capacities. Hybrid simulation is an effective experimental method to examine these issues: it enables simulation of the seismic response of squat and thick shear walls without the need to recreate the, often very large, mass associated with the rest of the prototype structure. A new method for hybrid simulation of the earthquake response of stiff specimens using a high-precision displacement encoder was developed and verified in this study. This method was implemented for hybrid simulation of seismic response of two large-scale squat reinforced concrete shear walls. In order to examine the response of squat reinforced concrete walls to earthquake ground motion and to investigate the effect of ground motion sequence, two nominally identically 8 in thick models of a prototype 36 in thick structural wall, typically found in nuclear facility structures, were tested. Each wall experienced a different ground motion level loading sequence. After an initial combined shear and flexural response, a sliding shear failure occurred at the base of the walls. This response was quasi-brittle: the walls rapidly lost strength with small increments of post-peak strength deformation. A nominally identical specimen was tested at the State University of New York at Buffalo. Though the quasi-static cyclic test method has been shown to accurately predict the seismic failure modes of ductile, often flexure-dominated, specimens, there is considerable uncertainty associated with the predictive ability of the quasi-static cyclic test method when the tested specimens have brittle or quasi-brittle failure modes. In these cases, the effect of load magnitude history is so significant that it alters the deformation demand and the sequence of seismic failure modes. The quasi-static cyclic test at Buffalo was compared to the hybrid seismic response simulation experiments at Berkeley to evaluate its effectiveness with capturing the wall response to ground motion sequences. The findings from the hybrid simulation tests were that displacement control hybrid simulation using a high-precision encoder for displacement feedback is an effective way to perform large-scale hybrid tests of stiff specimens. This new method is useful to address the shortcomings with understanding the dynamic behavior of these types of specimens. The results of the two wall hybrid simulation tests indicate that different earthquake magnitude sequences do not have a significant effect on the force-deformation response and the failure mode sequence of squat walls. After comparing the hybrid simulation test results to the quasi-static cyclic test at Buffalo, the quasi-static cyclic test was determined to be adequate for testing the quasi-brittle wall specimens. It effectively captured the global response of the squat shear walls in earthquake ground motion sequences. Comparison of wall response to code based predictive equations showed that the code equations overpredict the peak shear strength of these squat rectangular walls by factors as large as 2. Modifications to code recommendations for the initial stiffness and peak shear strength of these walls are offered, and a definition for the "essentially elastic" region, used in nuclear facility design, is also suggested.