Shear Strength and Seismic Performance of Non-seismically Designed Reinforced Concrete Beam-column Joints

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ISBN 13 :
Total Pages : 682 pages
Book Rating : 4.:/5 (68 download)

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Book Synopsis Shear Strength and Seismic Performance of Non-seismically Designed Reinforced Concrete Beam-column Joints by : Ho Fai Wong

Download or read book Shear Strength and Seismic Performance of Non-seismically Designed Reinforced Concrete Beam-column Joints written by Ho Fai Wong and published by . This book was released on 2005 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Evaluation and Prediction of Shear Behavior of Reinforced Concrete Beam-column Joints

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ISBN 13 :
Total Pages : 310 pages
Book Rating : 4.:/5 (232 download)

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Book Synopsis Evaluation and Prediction of Shear Behavior of Reinforced Concrete Beam-column Joints by : Firat Alemdar

Download or read book Evaluation and Prediction of Shear Behavior of Reinforced Concrete Beam-column Joints written by Firat Alemdar and published by . This book was released on 2007 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Beam-column joints are one of the most critical elements of reinforced concrete moment resisting frames subjected to lateral seismic loading. The older reinforced concrete buildings designed before the introduction of modern seismic codes in the early 1970's, in general, do not meet the current design code requirements. In particular, the beam-column joints in such existing buildings do not have appropriate detailing which leads to insufficient lateral strength or ductility to withstand the effects of a severe earthquake loading. Therefore, evaluation of the lateral load carrying capacity of existing buildings for subsequent retrofit is very important for the safety of the buildings. The economical aspect should also be considered during the design of a structure which is only possible if the behavior of the structure during an earthquake can be predicted. The focus of this research is to evaluate the shear behavior of reinforced concrete beam-column joints and to develop a suitable model that would predict the lateral load carrying capacity. Previous experimental studies and results have shown that the shear strength of beam-column joints depends on several variables including concrete strength, axial load ratio, joint geometry joint transverse reinforcement ratio, and displacement ductility. However, the current codes include the effects of all of these parameters in beam-column joint design. Therefore, previous analytical research is examined and this information is used to develop a shear strength model. The proposed model is mainly based on the shear strength model for columns developed by Sezen and Moehle (2004). The proposed shear strength model is verified with experimental test results. Overall, the model did a reasonable job of predicting the shear strength of reinforced concrete beam-column joints. The proposed model provides a simply tool for the analysis of existing reinforced concrete buildings subjected to lateral loading and to determine the amount of remediation necessary for satisfactory seismic performance.

Seismic Performance and Shear Strength of Reinforced Concrete Beam-column Knee Joints

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ISBN 13 :
Total Pages : 245 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Seismic Performance and Shear Strength of Reinforced Concrete Beam-column Knee Joints by : Nan Zhang

Download or read book Seismic Performance and Shear Strength of Reinforced Concrete Beam-column Knee Joints written by Nan Zhang and published by . This book was released on 2017 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:

State-of-the-art Review of Seismic Behavior of Deficient and Retrofitted Reinforced Concrete Beam Column Joints

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ISBN 13 : 9781124677545
Total Pages : 158 pages
Book Rating : 4.6/5 (775 download)

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Book Synopsis State-of-the-art Review of Seismic Behavior of Deficient and Retrofitted Reinforced Concrete Beam Column Joints by : Robert B. Lotus

Download or read book State-of-the-art Review of Seismic Behavior of Deficient and Retrofitted Reinforced Concrete Beam Column Joints written by Robert B. Lotus and published by . This book was released on 2011 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beam-column joint is considered a critical region in a structure when subjected to seismic load. Past earthquakes have shown that many of these structures behaved poorly and exhibited a combination of brittle failure at the joint and pullout of the beam longitudinal steel, leading to a rapid degradation of the joint and a precursor to a catastrophic collapse of a structure. Review of existing structures built prior to 1976 have determined concrete joints typically have little or no transverse reinforcement, discontinuous bottom beam reinforcement with insufficient embedment depth, and a common occurrence of column lap splice above the beam-column interface. Previous studies of rebar bond slip behavior, joint shear response, and joint interface - shear response were reviewed culminating in a study of various joint models simulating the behavior of deficient concrete beam-column joint subjected to a seismic load. An experimental test program consisting of three specimens was developed to test the behavior of deficient concrete beam-column joints. Specimen AB1 consists of deficient shear reinforcement at the joint, and will be tested to evaluate the behavior of a deficient reinforced concrete beam-column joint solely on insufficient shear reinforcement. Specimen AB2 is designed according to pre-1976 building standard and lacks sufficient rebar embedment of longitudinal beam reinforcement at the joint and has no shear reinforcement within the joint area. Specimen ACI318 is designed per the specifications of ACI 318-08, and will be used as the control specimen. Experimental results of the test program will eventually be applied as a baseline comparison to proposed state-of-the-art retrofit schemes aimed at enhancing the overall seismic performance of deficient reinforced concrete beam-column joints.

Design of Beam-column Joints for Seismic Resistance

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Publisher :
ISBN 13 :
Total Pages : 546 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Design of Beam-column Joints for Seismic Resistance by : James Otis Jirsa

Download or read book Design of Beam-column Joints for Seismic Resistance written by James Otis Jirsa and published by . This book was released on 1991 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Improving the Performance of Reinforced Concrete Beam-column Joints Designed for Seismic Resistance

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Publisher :
ISBN 13 :
Total Pages : 506 pages
Book Rating : 4.:/5 (761 download)

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Book Synopsis Improving the Performance of Reinforced Concrete Beam-column Joints Designed for Seismic Resistance by : Nicholas J. Brooke

Download or read book Improving the Performance of Reinforced Concrete Beam-column Joints Designed for Seismic Resistance written by Nicholas J. Brooke and published by . This book was released on 2011 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: The testing of thirteen large scale beam-column joints forms the framework for the content of this thesis. The thirteen tests were divided into three series, each of which investigated an aspect of earthquake resistant design of moment resisting frames. The results obtained from testing the first series of four beam-column joints contradicted the conclusion of earlier research that design criterion specifying the ratio of column depth to bar diameter required to anchor beam longitudinal reinforcement at interior beam-column joints was non-conservative when applied to Grade 500E reinforcement. As a result, a database of approximately 100 beam-column joints was assembled and used to parametrically develop an improved design criterion that was shown to satisfactorily predict experimental performance based on the anchorage length provided. It was also shown in the first part of the thesis that the flexural overstrength factor should be the same irrespective of whether Grade 300E or Grade 500E longitudinal reinforcement is used in a beam. This finding contradicts current New Zealand practice, which specifies a higher flexural overstrength factor for Grade 500E reinforcement. The second set of four tests assessed the performance of beam-column joints constructed using inorganic polymer concrete. The properties of inorganic polymer concrete are similar to those of concrete produced using Portland cement, but the production of inorganic polymer concrete releases 80% less "greenhouse gases" into the atmosphere than the production of Portland cement concrete. The results of these tests showed that satisfactory performance can be expected from beam-column joints designed using existing New Zealand standards but constructed using inorganic polymer concrete. The final series of five tests were conducted to assess the performance of beam-column joints when the joint core was constructed using high performance fibre reinforced cementitious composites (HPFRCC) and contained no conventional transverse reinforcement. The results of this testing showed that satisfactory performance could be achieved when the magnitude of the joint core shear stress was commensurate with the strength of the HPFRCC used. It was also evident that HPFRCC is significantly superior to plain concrete with regards to the anchorage of reinforcement within the joint core. A number of comments were made regarding the practicalities of using HPFRCC joint cores in real structures, from which it was concluded that for most structures HPFRCC joint cores are unlikely to be a practical alternative to conventionally reinforced joint cores.

Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints Without Transverse Reinforcement in Concrete Buildings

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Publisher :
ISBN 13 :
Total Pages : 998 pages
Book Rating : 4.:/5 (769 download)

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Book Synopsis Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints Without Transverse Reinforcement in Concrete Buildings by : Wael M. Hassan

Download or read book Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints Without Transverse Reinforcement in Concrete Buildings written by Wael M. Hassan and published by . This book was released on 2011 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints without Transverse Reinforcement in Concrete Buildings by Wael Mohamed Hassan Doctor of Philosophy in Engineering - Civil and Environmental Engineering University of California, Berkeley Professor Jack P. Moehle, Chair Beam-column joints in concrete buildings are key components to ensure structural integrity of building performance under seismic loading. Earthquake reconnaissance has reported the substantial damage that can result from inadequate beam-column joints. In some cases, failure of older-type corner joints appears to have led to building collapse. Since the 1960s, many advances have been made to improve seismic performance of building components, including beam-column joints. New design and detailing approaches are expected to produce new construction that will perform satisfactorily during strong earthquake shaking. Much less attention has been focused on beam-column joints of older construction that may be seismically vulnerable. Concrete buildings constructed prior to developing details for ductility in the 1970s normally lack joint transverse reinforcement. The available literature concerning the performance of such joints is relatively limited, but concerns about performance exist. The current study aimed to improve understanding and assessment of seismic performance of unconfined exterior and corner beam-column joints in existing buildings. An extensive literature survey was performed, leading to development of a database of about a hundred tests. Study of the data enabled identification of the most important parameters and the effect of each parameter on the seismic performance. The available analytical models and guidelines for strength and deformability assessment of unconfined joints were surveyed and evaluated. In particular, The ASCE 41 existing building document proved to be substantially conservative in joint shear strength estimation. Upon identifying deficiencies in these models, two new joint shear strength models, a bond capacity model, and two axial capacity models designed and tailored specifically for unconfined beamcolumn joints were developed. The proposed models strongly correlated with previous test results. In the laboratory testing phase of the current study, four full-scale corner beam-column joint subassemblies, with slab included, were designed, built, instrumented, tested, and analyzed. The specimens were tested under unidirectional and bidirectional displacement-controlled quasi-static loading that incorporated varying axial loads that simulated overturning seismic moment effects. The axial loads varied between tension and high compression loads reaching about 50% of the column axial capacity. The test parameters were axial load level, loading history, joint aspect ratio, and beam reinforcement ratio. The test results proved that high axial load increases joint shear strength and decreases the deformability of joints failing in pure shear failure mode without beam yielding. On the contrary, high axial load did not affect the strength of joints failing in shear after significant beam yielding; however, it substantially increased their displacement ductility. Joint aspect ratio proved to be instrumental in deciding joint shear strength; that is the deeper the joint the lower the shear strength. Bidirectional loading reduced the apparent strength of the joint in the uniaxial principal axes. However, circular shear strength interaction is an appropriate approximation to predict the biaxial strength. The developed shear strength models predicted successfully the strength of test specimens. Based on the literature database investigation, the shear and axial capacity models developed and the test results of the current study, an analytical finite element component model based on a proposed joint shear stress-rotation backbone constitutive curve was developed to represent the behavior of unconfined beam-column joints in computer numerical simulations of concrete frame buildings. The proposed finite element model included the effect of axial load, mode of joint failure, joint aspect ratio and axial capacity of joint. The proposed backbone curve along with the developed joint element exhibited high accuracy in simulating the test response of the current test specimens as well as previous test joints. Finally, a parametric study was conducted to assess the axial failure vulnerability of unconfined beam-column joints based on the developed shear and axial capacity models. This parametric study compared the axial failure potential of unconfined beam-column joint with that of shear critical columns to provide a preliminary insight into the axial collapse vulnerability of older-type buildings during intense ground shaking.

Seismic Performance of GFRP-RC Exterior Beam-column Joints with Lateral Beams

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Publisher :
ISBN 13 :
Total Pages : 420 pages
Book Rating : 4.:/5 (915 download)

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Book Synopsis Seismic Performance of GFRP-RC Exterior Beam-column Joints with Lateral Beams by : Shervin Khalili Ghomi

Download or read book Seismic Performance of GFRP-RC Exterior Beam-column Joints with Lateral Beams written by Shervin Khalili Ghomi and published by . This book was released on 2014 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beam-column joints -- seismic design -- connections -- joint shear capacity -- edge beams -- FRP reinforced concrete.

Seismic Rehabilitation of Existing Buildings

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Publisher : ASCE Publications
ISBN 13 :
Total Pages : 436 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Seismic Rehabilitation of Existing Buildings by : American Society of Civil Engineers

Download or read book Seismic Rehabilitation of Existing Buildings written by American Society of Civil Engineers and published by ASCE Publications. This book was released on 2007 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Standard ASCE/SEI 41-06 presents the latest generation of performance-based seismic rehabilitation methodology.

Investigation of Sand Lightweight Concrete Beam-column Joints Subjected to Quasi-static Loading

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Publisher :
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.:/5 (945 download)

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Book Synopsis Investigation of Sand Lightweight Concrete Beam-column Joints Subjected to Quasi-static Loading by : Curtis L. Decker

Download or read book Investigation of Sand Lightweight Concrete Beam-column Joints Subjected to Quasi-static Loading written by Curtis L. Decker and published by . This book was released on 2012 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of sand-lightweight concrete made with expanded shale aggregate is prevalent throughout the United States and other developed countries. Sand-lightweight concrete is approximately twenty percent lighter than its normalweight counterpart. Lateral earthquake forces applied to a building structure are directly proportional to its mass, so the potential for better seismic performance is clear. Unfortunately, concrete made with lightweight aggregate behaves differently in key aspects when compared to normalweight concrete that can negate its design force reducing advantage. Specifically, lightweight concrete is more brittle in nature than normalweight concrete and as such is less ductile. Ductility is key in seismic design because the structure must be able to absorb the energy produced by the earthquake. This study focused on determining the particular behavior of reinforced sand-lightweight concrete beam-column joints of moment frame buildings under a quasi-static cyclical loading that simulated a seismic event. Six half-scale experimental test specimens and sixty-five non-linear finite element models were used to evaluate the performance of the joints. The experimental portion of this study found that if designed and detailed in accordance with ACI 318-11 standards and if joint shear stress is kept within a reasonable limit, sand-lightweight beam column joints can perform as well as similarly built normalweight concrete specimens. This finding was true even for concrete compressive strengths up to 8000 pounds per square inch. The parametric finite element modeling portion of this study showed the effect on joint performance by varying the following four key parameters: the compressive strength of concrete, the amount of joint shear reinforcement, the longitudinal beam steel reinforcement ratio, and the axial load applied to the column.

Seismic Assessment and Retrofit of Reinforced Concrete Buildings

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Publisher : fib Fédération internationale du béton
ISBN 13 : 9782883940642
Total Pages : 322 pages
Book Rating : 4.9/5 (46 download)

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Book Synopsis Seismic Assessment and Retrofit of Reinforced Concrete Buildings by : fib Fédération internationale du béton

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

Experimental Study on Steel-concrete Composite NPS System Beam Column Joints Under Reversed Cyclic Earthquake Loading

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Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)

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Book Synopsis Experimental Study on Steel-concrete Composite NPS System Beam Column Joints Under Reversed Cyclic Earthquake Loading by : Jenifer Ann Albright

Download or read book Experimental Study on Steel-concrete Composite NPS System Beam Column Joints Under Reversed Cyclic Earthquake Loading written by Jenifer Ann Albright and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced concrete (RC) moment resisting frames (MRF) have traditionally been one of the most common structural systems used to resist lateral loads induced by seismic activities. Earthquake ground-shaking seismic loads cause displacement of the building, also known as “sway” or “drift”, over multiple displacement cycles. The RC MRF, which consists of beams, columns, and beam-column joints, is designed to achieve a ductile response through optimized detailing and proportioning to resist flexural, axial, and shear forces transferred into the structure during building sway. The current accepted design procedure for seismically active locations is to provide capacity protected members. This theory states that the columns of the beam-column system should be stronger than the beams, such that during ultimate design loads the beams will fail prior to the columns, which is a ductile failure mechanism.There is an abundant desire to improve reliability, safety, economic costs, efficiency, and performance of MRFs. To that end, many innovative MRF solutions have been proposed over the years, including precast or partially precast systems, steel braced RC joints, and concrete-steel composite systems. Among the many novel suggestions, the NPS system represents a recent and promising solution which aims to be unique, advanced, and technologically efficient to attain ductile MRFs capable of high seismic performance. The NPS system is a steel concrete composite system, consisting of a steel HSS square, circular, or rectangular cross sectional column with self-supporting beams made of a flexural steel plate bottom chord with a welded truss (to act as the beam shear reinforcement) and undeformed top rebar steel. The system is completed with concrete cast in-situ. Use of partially prefabricated elements as well as in-place elements represents a delicate challenge of providing adequate moment continuity of the beam-column joint while ensuring the integrity of the joint region. To attempt to solve this challenge and achieve moment continuity, integrative steel elements are inserted through the joint after the beam trusses have been set in position but before the concrete is cast. Prior to this project, no experimental evidence was available to support the dependability of this moment continuity configuration. This thesis presents and discusses the results of an experimental program of nine (five interior and four exterior) full-scale 2D concrete-steel composite NPS beam column joints, and two traditionally Eurocode compliant reinforced concrete beam-column joints (one interior and one exterior). This program was developed to investigate and ultimately assess the seismic performance of the NPS system with specific consideration to the integrative steel elements providing moment continuity. The different moment continuity solutions adopted included the use of integrated truss elements (i.e., continuity trusses) and straight or hooked deformed bars (i.e., continuity bars). Additional variables considered included the level of shear protection of the joint “panel” region and the presence/absence of additional shear reinforcement in the beam end-regions (i.e., the “critical” or “plastic hinge” length). This thesis provides a detailed discussion of the experimental outcomes and a careful analysis of the observed response mechanisms and any subsequent design implications. The results of the experimental investigation were extrapolated to assess the performance of the specimen in terms of shear stress and shear strain in the joint, sub-component contribution to the total drift, energy dissipation, peak and residual strength, initial and residual stiffness, and ductility. The response of the NPS specimens was compared against a tangible target performance from the traditionally Eurocode compliant RC specimens. The experimental results demonstrated that, in at least one configuration, the NPS system can effectively achieve modern proficient seismic performance objectives. This can be seen through equivalent or superior performance criteria comparison to their traditional RC counterparts.

Guidelines for earthquake resistant non-engineered construction

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Author :
Publisher : UNESCO
ISBN 13 : 9230000329
Total Pages : 191 pages
Book Rating : 4.2/5 (3 download)

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Book Synopsis Guidelines for earthquake resistant non-engineered construction by : Arya, Anand S

Download or read book Guidelines for earthquake resistant non-engineered construction written by Arya, Anand S and published by UNESCO. This book was released on 2014-08-25 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Seismic Design of Reinforced Concrete Buildings

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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 Performance of Reinforced Concrete Beam-column Joints Strengthened by Ferrocement Jackets

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Publisher :
ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Seismic Performance of Reinforced Concrete Beam-column Joints Strengthened by Ferrocement Jackets by : Bo Li

Download or read book Seismic Performance of Reinforced Concrete Beam-column Joints Strengthened by Ferrocement Jackets written by Bo Li and published by . This book was released on 2014 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Gravity and Seismic Analysis and Design of Beam-column Joints

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (85 download)

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Book Synopsis The Gravity and Seismic Analysis and Design of Beam-column Joints by : Pelin Gündeş Bakır

Download or read book The Gravity and Seismic Analysis and Design of Beam-column Joints written by Pelin Gündeş Bakır and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 1- Overview vof the thesis This thesis has three original contributions. The first is the proposal for a new design equation for predicting the joint shear strength. The second is the proposal for a new methodology for predicting the failure modes of joints and the third is the proposal for a new strut and tie model for joints. 2. The Proposed Design Equation Several parametric studies are carried out on an experimental database. The results have shown that the joint shear strength increases as the concrete cylinder strength the beam longitudinal reinforcement ratio and the stirrup ratio increases. The joint shear strength decreases when the joint aspect ratio increases and the shear strength is independent of the column axial stress and the column longitudinal reinforcement ratio. 1. It realistically models the contribution of stirrups in the joint. 2. It takes the influences of beam longitudinal reinforcement ratio into account.3 .It realistically models the influence of the joint aspect ratio.4. It realistically models the influence of concrete cylinder strength. 5. The equation is simple and accurately predicts the joint shear strength. 3. The proposed strut and tie model The author's simplified strut and tie model is shown in Figure 1. The model gives accurate predictions of the failure loads. Parametric studies are carried out to investigate the influence of the concrete cylinder strength, column longitudinal reinforcement ratio, column axial stress and the joint aspect ratio in joints with and without stirrups. 1. The model predicted that the joint shear strength normalized by the concrete cylinder strength, V /be hc fc, slightly decreased due to increasing concrete cylinder strength in joints without stirrups. This prediction is in agreement with the test data because the joint shear strength, in reality, is proportional to the square root of the concrete cylinder strength. 2. The model predicted that the joint shear strength, normalized by the concrete cylinder strength: V /be hc fc, slightly decreased due to increasing concrete cylinder strength in joints with stirrups. This prediction is in agreement with the test data because the joint shear strength, in reality, is proportional to the square root of the concrete cylinder strength, fc not to fc. 3. In joints without stirrups, the model predicted that the joint shear strength is independent of the column axial stress as the test data suggests. 4. In joints with stirrups, the model predicted that the joint shear strength is independent of the column axial stress as the test data suggests. 5. In joints without stirrups, the model predicted that the joint shear strength is independent of the column longitudinal reinforcement ratio as the test data suggests. 6. In joints with stirrups, the model predicted that the joint shear strength is independent of the column longitudinal reinforcement ratio as the test data suggests. 7. In joints without stirrups, the model predicted that the joint shear strength decreased with increasing joint aspect ratio. This is in agreement with the test data. 8. In joints with stirrups, the model predicted that the joint shear strength decreased with increasing joint aspect ratio. This is in agreement with the test data. As apparent from the parametric studies. the model is in good agreement with the test data. 4. The Proposed Methodology for Failure Modes In this part of the thesis, a new methodology for predicting the failure modes of joints is presented as shown in Figs. 2 and 3. The proposed methodology is different for joints without significant amount of stirrups and for joints with medium or high amount of stirrups.

Artificial Intelligence and Machine Learning Techniques for Civil Engineering

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Author :
Publisher : IGI Global
ISBN 13 : 1668456443
Total Pages : 404 pages
Book Rating : 4.6/5 (684 download)

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Book Synopsis Artificial Intelligence and Machine Learning Techniques for Civil Engineering by : Plevris, Vagelis

Download or read book Artificial Intelligence and Machine Learning Techniques for Civil Engineering written by Plevris, Vagelis and published by IGI Global. This book was released on 2023-06-05 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, artificial intelligence (AI) has drawn significant attention with respect to its applications in several scientific fields, varying from big data handling to medical diagnosis. A tremendous transformation has taken place with the emerging application of AI. AI can provide a wide range of solutions to address many challenges in civil engineering. Artificial Intelligence and Machine Learning Techniques for Civil Engineering highlights the latest technologies and applications of AI in structural engineering, transportation engineering, geotechnical engineering, and more. It features a collection of innovative research on the methods and implementation of AI and machine learning in multiple facets of civil engineering. Covering topics such as damage inspection, safety risk management, and information modeling, this premier reference source is an essential resource for engineers, government officials, business leaders and executives, construction managers, students and faculty of higher education, librarians, researchers, and academicians.