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Author :
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (31 download)
Download or read book Seismic Retrofit of Existing Concrete Frame Structures Using Viscoelastic Damping Devices written by and published by . This book was released on 1995 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (227 download)
Download or read book Seismic Retrofit of Existing Concrete Frame Structures Using Viscoelastic Damping Devices: A Research-in-Progress Update written by and published by . This book was released on 1995 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Army and Air Force have large inventories of concrete frame buildings built before the 1971 San Francisco earthquake, when seismic provisions in U.S. building codes were enhanced. Consequently, many of these buildings may not safely withstand the ground motions associated with large intensity earthquakes. The U.S. Army Construction Engineering Research Laboratories (USACERL) has developed a program to provide improved technologies for mitigating seismic hazards in older military buildings. This study investigated the effectiveness of a nonintrusive rehabilitation technique involving the addition of viscoelastic damping devices to a concrete structure. A one-third scale model of a concrete building was built and placed on the USACERL shaking table. The building was earthquake-tested using two sizes of dampers, and with no dampers in place. Preliminary observations showed that the model with dampers sustained only minimal damage. More detailed analysis continues.
Author :
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (318 download)
Download or read book Proceedings written by and published by . This book was released on 1995 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John R. Hayes
Publisher :
ISBN 13 :
Total Pages : 921 pages
Book Rating : 4.:/5 (412 download)
Download or read book Investigation of the Use of Viscoelastic Damping Devices to Rehabilitate a Lightly Reinforced Concrete Slab- Column Structure written by John R. Hayes and published by . This book was released on 1998 with total page 921 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to develop improved understanding of the seismic behavior of a lightly reinforced concrete (LRC) slab-column structure seismically retrofitted with viscoelastic dampers (VEDs). The feasibility of using VEDs to rehabilitate existing LRC slab-column structures was explored, and implications for structural design were considered. A model of a section of a 1950s-era three-story military barracks building was fabricated for testing. A rehabilitation scheme using VEDs was designed and implemented. This section model was subjected to a series of earthquake simulations on the shaking table at the U.S. Army Construction Engineering Research Laboratories (CERL). Experimental measurements included floor and VED displacements, floor accelerations, VED forces, and reinforcement strains. The earthquake simulations comprised a series of gradually increasing intensity replications of two commonly used earthquake records, first on the frame fitted with VEDs, then on the frame without VEDs. Interpretations of the testing results are provided through the use of linear models of the type that might be used in the design office. These analytical models also were used to assess the applicability of the linear modeling procedures that have been recommended in Federal Emergency Management Agency document 273, "NEHRP Guidelines for the Seismic Rehabilitation of Buildings."
Author : Sachin Kuckian
Publisher : GRIN Verlag
ISBN 13 : 3668992762
Total Pages : 90 pages
Book Rating : 4.6/5 (689 download)
Download or read book A study on seismic response of reinforced structures retrofitted with fluid viscous dampers in shear walls written by Sachin Kuckian and published by GRIN Verlag. This book was released on 2019-08-05 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2015 in the subject Engineering - Geotechnology, grade: 9.44, , course: Masters (Structural Engineering), language: English, abstract: The present study investigates the seismic behavior of multi-story building using damping devices strategically located within the lateral load resisting elements. It concentrates on a retrofitting strategy with passive energy dissipation device known as Fluid Viscous Damper (FVD) which will be applicable to new design as well as retrofitting existing buildings to ensure seismic safety by fitting damping devices which can transform a wall panel into a damping element. The first study involves analysis of a nine-story model having cut-outs and the use of the dampers of different configuration in these structures. The second study involves the use the diagonal brace configuration dampers provided in the cutout sections of 2D 9, 18, 27 storey structures and 3D 27 storey with core wall structure at three consecutive story levels each. For the second study, the cut out locations is varied depending on their relative positions. The relative position is the ratio of the total height of the structure to the upper edge of the topmost cut-out. These structures were initially modeled and time history analysis was performed on the structure without FVD and the structure retrofitted with FVD. Three different ground motions were used for the analysis. Results of the un- retrofitted structures are then compared with a retrofitted structure in terms of peak story displacements, roof accelerations, and pseudo-spectral accelerations. Study shows that there has been a significant reduction in seismic demands for a structure retrofitted with FVD in terms of peak storey displacements, pseudo-spectral accelerations and roof accelerations when the dampers are placed at lower three cut outs i.e. with high relative position. It is also observed that damping coefficient value obtained is least for upper toggle-brace configuration out of the four different damper configurations and with maximum reduction compared to other configurations. For modeling and analysis purpose the software SAP2000® is used. Through the study it could be concluded that FVD significantly reduces the seismic demands of the structure in terms of peak storey displacements, pseudo-spectral accelerations and roof accelerations. This suggests that FVDs can be efficiently used in retrofitting. Also damping coefficient value obtained is least for upper toggle-brace configuration out of the four different damper configurations suggesting this is the most efficient configuration for retrofitting.
Author : Matthew Fox
Publisher : Emerald Group Publishing
ISBN 13 : 1835498345
Total Pages : 309 pages
Book Rating : 4.8/5 (354 download)
Download or read book Seismic Retrofit of Existing Buildings written by Matthew Fox and published by Emerald Group Publishing. This book was released on 2024-09-19 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic Retrofit of Existing Buildings is a concise and easy-to-use guideline for practising engineers to assess and design successful seismic retrofit interventions for existing vulnerable buildings. It offers readers guidance on both conceptual design strategies and relevant detailed design considerations.
Author :
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.3/5 (91 download)
Download or read book Guidelines for Seismic Retrofit of Existing Buildings written by and published by . This book was released on 2001 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This renamed version of the former Uniform code for building conservation guidelines for retrofitting unreinforced masonry bearing wall buildings, reinforced concrete and reinforced masonry buildings, wood frame residential buildings, and concrete with masonry infill buildings.
Author : Sarven Akçelyan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Seismic Retrofit of Existing Steel Tall Buildings with Supplemental Damping Devices written by Sarven Akçelyan and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "A number of existing tall steel buildings in seismic regions may have potential deficiencies to seismic events with low probability of occurrence. It is understood that the seismic performance of such buildings should be evaluated thoroughly such that effective retrofit solutions can be proposed. In this thesis, the emphasis is on the implementation of supplemental damping devices, particularly, nonlinear viscous damper (NVDs), oil dampers with relief valves (ODs) and buckling-restrained braces (BRBs). In the context of performance based design there is an increased need to improve the reliability of state-of-art and simplified evaluation methods for tall buildings equipped with supplemental damping devices. This research presents enhanced models and algorithms for the numerical simulation of NVDs, ODs and BRBs within a nonlinear finite element program. Adaptive algorithms are implemented for computing high-precision solutions for NVDs and ODs that are typically represented mathematically with a nonlinear Maxwell model. Furthermore, a novel rate-dependent material model for BRBs and its calibration procedure with experimental data is developed. The applicability and computational efficiency of the numerical models is demonstrated through a number of validation examples with data that involve component experimentation as well as the utilization of full-scale shake table tests of a 5-story steel building equipped with supplemental damping devices. Based on a comparison of various engineering demand parameters with experimental data, it is shown that linear and nonlinear static procedures as per ASCE 41-13 may be unconservative for the evaluation of frame buildings with BRBs or NVDs, while the performance curves and P-Spectra methods provide more reliable predictions. In order to enhance current design methods for dampers in tall buildings, a practical multi-degree-of-freedom (MDF) performance curves tool is developed. The advantage of this tool over currently used methods is that the designer can directly obtain story-based EDPs for a range of design solutions, which do not contain typical errors due to transformation, (i.e. SDF idealization, higher modes, flexural deformations, irregular damping distribution) and linearization. A comprehensive study related to the seismic performance assessment of a benchmark existing 40-story steel building with moment-resisting frames that represents typical 1970s construction in North America is presented. Supplemental damping provided by ODs is utilized to design an efficient seismic retrofit system for the 40-story steel building under consideration. Multiple retrofit solutions are designed based on three damping levels. It is shown that the formation of local story collapse mechanisms can be prevented and the drift distribution can be controlled along the height of the building. The efficiency of vertical damping distribution methods varies with the level of the frame inelasticity." --
Author :
Publisher :
ISBN 13 : 9781642241815
Total Pages : 375 pages
Book Rating : 4.2/5 (418 download)
Download or read book Strengthening and Retrofitting of Existing Structures written by and published by . This book was released on 2018-05 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. The planning of changes to existing buildings differs from new planning through an important condition; the existing construction must be taken as the basis of all planning and building actions. The need for seismic retrofitting of an existing building can arise due to several reasons like: building not designed to code, subsequent updating of code and design practice, subsequent upgrading of seismic zone, deterioration of strength and aging, modification of existing structure, change in use of the building, etc. Seismic retrofit is primarily applied to achieve public safety, with various levels of structure and material survivability determined by economic considerations. In recent years, an increased urgency has been felt to strengthen the deficient buildings, as part of active disaster mitigation, and to work out the modifications that may be made to an existing structure to improve the structural performance during an earthquake. Seismic retrofitting schemes can be either global or local, based on how many members of the structures they are used for. Global Retrofit methods include conventional methods (increase seismic resistance of existing structures) or non-conventional methods (reduction of seismic demand). Strengthening and Retrofitting of Existing Structures is a compendium of cutting-edge trends of the research and existing practices in strengthening and retrofitting of structural elements, as well as the findings of a research endeavor initiated by the authors to investigate and develop a robust structural retrofitting scheme by utilizing elastomeric polymers to enhance the resistance of reinforced concrete (RC) structures. It addresses in detail specific techniques for the strengthening of traditional constructions, reinforced concrete buildings, bridges and their foundations. It also presents insight into the key issues relevant to seismic retrofit of concrete frame buildings. Many guidelines are reviewed regarding seismic rehabilitation of school, office, hospital and apartment buildings.
Author : Stelios Antoniou
Publisher : John Wiley & Sons
ISBN 13 : 1119987326
Total Pages : 549 pages
Book Rating : 4.1/5 (199 download)
Download or read book Seismic Retrofit of Existing Reinforced Concrete Buildings written by Stelios Antoniou and published by John Wiley & Sons. This book was released on 2023-04-24 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seismic Retrofit of Existing Reinforced Concrete Buildings Understand the complexities and challenges of retrofitting building infrastructure Across the world, buildings are gradually becoming structurally unsound. Many were constructed before seismic load capacity was a mandatory component of building standards, and were often built with low-quality materials or using unsafe construction practices. Many more are simply aging, with materials degrading, and steel corroding. As a result, efforts are ongoing to retrofit existing structures, and to develop new techniques for assessing and enhancing seismic load capacity in order to create a safer building infrastructure worldwide. Seismic Retrofit of Existing Reinforced Concrete Buildings provides a thorough book-length discussion of these techniques and their applications. Balancing theory and practice, the book provides engineers with a broad base of knowledge from which to approach real-world seismic assessments and retrofitting projects. It incorporates knowledge and experience frequently omitted from the building design process for a fuller account of this critical engineering subfield. Seismic Retrofit of Existing Reinforced Concrete Buildings readers will also find: Detailed treatment of each available strengthening technique, complete with advantages and disadvantages In-depth guidelines to select a specific technique for a given building type and/or engineering scenario Step-by-step guidance through the assessment/retrofitting process Seismic Retrofit of Existing Reinforced Concrete Buildings is an ideal reference for civil and structural engineering professionals and advanced students, particularly those working in seismically active areas.
Author :
Publisher :
ISBN 13 :
Total Pages : 654 pages
Book Rating : 4.:/5 (319 download)
Download or read book Corps of Engineers Structural Engineering Conference written by and published by . This book was released on 1996 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert D. Hanson
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (321 download)
Download or read book Seismic Design with Supplemental Energy Dissipation Devices written by Robert D. Hanson and published by . This book was released on 2001 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this monograph is to impart basic concepts of the supplemental energy dissipation technology to design engineers, architects, and building officials so they can understand its benefits and limitations in structural applications. The approach is introductory. References are cited throughout the monograph for readers who wish to study the subject in more depth.Supplemental energy dissipation systems are recent innovations to improve earthquake building performance. Research has led to a better understanding of the effects of supplemental energy dissipation on the earthquake response of buildings. Over the last 20 years, significant progress has been made in developing manufactured systems. They are being reliably designed and installed in new as well as existing buildings.Development of design codes and standards for energy dissipation systems has progressed slowly. This monograph summarizes information on their use in designing new earthquake-resistant buildings and upgrading the seismic performance of existing buildings. The following areas are covered:? The physical consequences of adding energy dissipation systems to a structure for various types of input motion? Summary of generic energy dissipation device characteristics? Summary of pros and cons of specific device characteristics in meeting selected design objectives? Seismic design limits for selecting energy dissipation systems? Design approaches for the limits of elastic or inelastic response
Author : John R. Hayes
Publisher :
ISBN 13 :
Total Pages : 921 pages
Book Rating : 4.:/5 (412 download)
Download or read book Investigation of the Use of Viscoelastic Damping Devices to Rehabilitate a Lightly Reinforced Concrete Slab-column Structure written by John R. Hayes and published by . This book was released on 1998 with total page 921 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to develop improved understanding of the seismic behavior of a lightly reinforced concrete (LRC) slab-column structure seismically retrofitted with viscoelastic dampers (VEDs). The feasibility of using VEDs to rehabilitate existing LRC slab-column structures was explored, and implications for structural design were considered. A model of a section of a 1950s-era three-story military barracks building was fabricated for testing. A rehabilitation scheme using VEDs was designed and implemented. This section model was subjected to a series of earthquake simulations on the shaking table at the U.S. Army Construction Engineering Research Laboratories (CERL). Experimental measurements included floor and VED displacements, floor accelerations, VED forces, and reinforcement strains. The earthquake simulations comprised a series of gradually increasing intensity replications of two commonly used earthquake records, first on the frame fitted with VEDs, then on the frame without VEDs. Interpretations of the testing results are provided through the use of linear models of the type that might be used in the design office. These analytical models also were used to assess the applicability of the linear modeling procedures that have been recommended in Federal Emergency Management Agency document 273, "NEHRP Guidelines for the Seismic Rehabilitation of Buildings."
Author : fib Fédération internationale du béton
Publisher : fib Fédération internationale du béton
ISBN 13 : 9782883940642
Total Pages : 322 pages
Book Rating : 4.9/5 (46 download)
Download or read book Seismic Assessment and Retrofit of Reinforced Concrete Buildings written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2003-08-01 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: In most parts of the developed world, the building stock and the civil infrastructure are ageing and in constant need of maintenance, repair and upgrading. Moreover, in the light of our current knowledge and of modern codes, the majority of buildings stock and other types of structures in many parts of the world are substandard and deficient. This is especially so in earthquake-prone regions, as, even there, seismic design of structures is relatively recent. In those regions the major part of the seismic threat to human life and property comes from old buildings. Due to the infrastructure's increasing decay, frequently combined with the need for structural upgrading to meet more stringent design requirements (especially against seismic loads), structural retrofitting is becoming more and more important and receives today considerable emphasis throughout the world. In response to this need, a major part of the fib Model Code 2005, currently under development, is being devoted to structural conservation and maintenance. More importantly, in recognition of the importance of the seismic threat arising from existing substandard buildings, the first standards for structural upgrading to be promoted by the international engineering community and by regulatory authorities alike are for seismic rehabilitation of buildings. This is the case, for example, of Part 3: Strengthening and Repair of Buildings of Eurocode 8 (i. e. of the draft European Standard for earthquake-resistant design), and which is the only one among the current (2003) set of 58 Eurocodes attempting to address the problem of structural upgrading. It is also the case of the recent (2001) ASCE draft standard on Seismic evaluation of existing buildings and of the 1996 Law for promotion of seismic strengthening of existing reinforced concrete structures in Japan. As noted in Chapter 1 of this Bulletin, fib - as CEB and FIP did before - has placed considerable emphasis on assessment and rehabilitation of existing structures. The present Bulletin is a culmination of this effort in the special but very important field of seismic assessment and rehabilitation. It has been elaborated over a period of 4 years by Task Group 7.1 Assessment and retrofit of existing structures of fib Commission 7 Seismic design, a truly international team of experts, representing the expertise and experience of all the important seismic regions of the world. In the course of its work the team had six plenary two-day meetings: in January 1999 in Pavia, Italy; in August 1999 in Raleigh, North Carolina; in February 2000 in Queenstown, New Zealand; in July 2000 in Patras, Greece; in March 2001 in Lausanne, Switzerland; and in August 2001 in Seattle, Washington. In October 2002 the final draft of the Bulletin was presented to public during the 1st fib Congress in Osaka. It was also there that it was approved by fib Commission 7 Seismic Design. The contents is structured into main chapters as follows: 1 Introduction - 2 Performance objectives and system considerations - 3 Review of seismic assessment procedures - 4 Strength and deformation capacity of non-seismically detailed components - 5 Seismic retrofitting techniques - 6 Probabilistic concepts and methods - 7 Case studies
Author :
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.E/5 ( download)
Download or read book Technical Report written by and published by . This book was released on 1987 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chih-Ping Fan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (48 download)
Download or read book Seismic Analysis, Behavior, and Retrofit of Non-ductile Reinforced Concrete Frame Buildings with Viscoelastic Dampers written by Chih-Ping Fan and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rajesh Shankar Rao
Publisher :
ISBN 13 :
Total Pages : 602 pages
Book Rating : 4.E/5 ( download)
Download or read book Seismic Retrofit of Non-ductile RC Frames Using Friction Dampers written by Rajesh Shankar Rao and published by . This book was released on 1996 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
