Seismic Performance Of Reinforced Concrete Nonconforming Columns
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Seismic Performance Of Reinforced Concrete Nonconforming Columns
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Author : Farah Falah Dameh
language : en
Publisher:
Release Date : 2021
Seismic Performance Of Reinforced Concrete Nonconforming Columns written by Farah Falah Dameh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
The estimation of deformation indices and strength capacities of reinforced concrete structural members is neither a simple nor a systematic unique approach. Several analytical models for such estimations have evolved over the years (Park and Paulay (1975), Lehman et al. (1998), Panagiotakos and Fardis (2001), FEMA 273 (1997), Priestley et al. (1996)) and some are an essential part of todays Seismic Codes of Assessment in the form of acceptance criteria (e.g. EC8-III 2020, ASCE/SEI 41-17). However, significant dispersion still exists between experimental data and code-based analytical estimates, especially when assessing structures built prior to the consolidation of capacity-design provisions in international codes (before the 1980s). These structures -referred to as nonconforming - consist primarily of structural members that possess deficiencies in the quality of concrete and steel, and in the transverse and/or longitudinal reinforcement detailing. Deficiencies in longitudinal detailing consists of presence of lap splice at the base of the column or inadequate development lengths, and sparse and poorly anchored transverse reinforcement. In the present work a comparative study was conducted using advanced nonlinear finite element simulations (using software ATENA, https://www.cervenka.cz/) for a benchmark set of columns modelling older detailing practices. Pushover analyses were conducted on the column models in order to determine the parametric sensitivity of the deformation indices, failure mode and associated strength of these benchmark cases to their basic design properties (such as longitudinal and transverse reinforcement ratios and arrangement, axial load ratio and anchorage/lap-splice geometries). It was found that deformation capacities of columns deteriorate significantly in the presence of lap splice or insufficient anchorage length in critical regions.Stirrup yielding and shear failure are suppressed in the case of adequate confinement and may only appear with higher axial compression. Yield penetration and pull out failure dominates the failure mechanism at low axial loads limiting the deformation capacity significantly in the absence of good confinement. The analytical results are calibrated against The design expressions used in the assessment codes illustrating the limits of the applicability and the discord between the different approaches used by current codes to define the so-called acceptance criteria in the seismic assessment practice. The simulation results are also used to vet the various assumptions that underlie the simple mechanistic models used in deriving seismic design expressions for yield and the ultimate deformation capacities, shear strength, and the rate of its degradation with increasing ductility.
Design Of Reinforced Concrete Buildings For Seismic Performance
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Author : Mark Aschheim
language : en
Publisher: CRC Press
Release Date : 2019-04-05
Design Of Reinforced Concrete Buildings For Seismic Performance written by Mark Aschheim and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-05 with Technology & Engineering categories.
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.
Seismic Performance Of Concrete Buildings
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Author : Liviu Crainic
language : en
Publisher: CRC Press
Release Date : 2012-12-10
Seismic Performance Of Concrete Buildings written by Liviu Crainic and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-10 with Technology & Engineering categories.
This book examines and presents essential aspects of the behavior, analysis, design and detailing of reinforced concrete buildings subjected to strong seismic activity. Seismic design is an extremely complex problem that has seen spectacular development in the last decades. The present volume tries to show how the principles and methods of earthqua
Seismic Performance Of Full Scale Reinforced Concrete Columns
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Author : Sungjin Bae
language : en
Publisher:
Release Date : 2005
Seismic Performance Of Full Scale Reinforced Concrete Columns written by Sungjin Bae and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Columns, Concrete categories.
Seismic Assessment And Retrofit Of Reinforced Concrete Columns
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Author : Konstantinos G. Megalooikonomou
language : en
Publisher: Cambridge Scholars Publishing
Release Date : 2019-02-27
Seismic Assessment And Retrofit Of Reinforced Concrete Columns written by Konstantinos G. Megalooikonomou and has been published by Cambridge Scholars Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-27 with Technology & Engineering categories.
Reinforced concrete columns play a very important role in structural performance. As such, it is essential to apply a suitable analytical tool to estimate their structural behaviour considering all failure mechanisms such as axial, shear, and flexural failures. This book highlights the development of a fiber beam-column element accounting for shear effects and the effect of tension stiffening through reinforcement-to-concrete bond, along with the employment of suitable constitutive material laws.
Analysis Of Sustained Load Effects On The Seismic Performance Of Reinforced Concrete Columns
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Author : Luis Ernesto Rey
language : en
Publisher:
Release Date : 1991
Analysis Of Sustained Load Effects On The Seismic Performance Of Reinforced Concrete Columns written by Luis Ernesto Rey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Seismic Performance Of Circular Reinforced Concrete Columns Under Varying Axial Load
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Author : Gianmario Benzoni
language : en
Publisher:
Release Date : 1996
Seismic Performance Of Circular Reinforced Concrete Columns Under Varying Axial Load written by Gianmario Benzoni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Bridges categories.
The behavior of four circular reinforced concrete bridge columns, with different axial load regimes, is investigated. The first unit was tested under constant compressive axial load corresponding to an axial load ratio of 0.35. The second specimen was subjected to a constant tensile axial force equivalent to 0.087 axial load ratio. Two specimens were tested under varying regime of axial load, ranging between the two previous load limits, in order to simulate realistic seismic conditions of outer columns of multi-column bents. Extended comparison between experimental and predicted shear response, from different current equations, is provided.
Seismic Performance Of Composite Beam Columns
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Author : Shannon D. Paboojian
language : en
Publisher:
Release Date : 1993
Seismic Performance Of Composite Beam Columns written by Shannon D. Paboojian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Columns categories.
Abstract: "An experimental study was undertaken to investigate the cyclic strength and ductility of composite columns subjected to simulatedseismic loading conditions. Eight two-thirds scale specimens were tested, each consisting of a structural steel shape encased in reinforcedconcrete. Parameters studied in the test program included: the degree of concrete confinement required to achieve adequate ductility; the effectiveness of shear studs for developing flexural stiffness and capacity under combined loading; the distribution of transverse shear resistance among the elements of the composite column; and concrete compressive strength. The results of the test program indicate that composite columns possess exceptional ductility and strength under cyclic loading if the buckling of longitudinal reinforcement is inhibited. Furthermore, the steel shape provides the primary resistance to transverse shear during overloading, and shear studs are not effective in enhancing the resistance against lateral loading. The elastic secant stiffness of the composite section corresponding to initial yielding of the longitudinal reinforcement was found to be well approximated by using one-half the gross moment of inertia (0.5I[subscript g]) in conjunction with Young's modulus for concrete. A prediction method based on superimposing the individual strengths of the reinforced concrete and structural steel shape was found to provide good agreement with test results. Current AISC LRFD provisions were determined to grossly underestimate the flexural capacity of the test specimens, which were axially loaded to 20% of their nominal pure axial load capacity [sic]."
Seismic Performance Of Steel Reinforced Concrete Composite Columns Of Older And Modern Construction
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Author : Mayer Gerges Farag
language : en
Publisher:
Release Date : 2017
Seismic Performance Of Steel Reinforced Concrete Composite Columns Of Older And Modern Construction written by Mayer Gerges Farag and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Buildings categories.
Abstract: Existing concrete buildings lacking seismic details are well known to cause most losses during earthquakes so there is no wonder they are nicknamed killer buildings. In every new earthquake we see more evidence of their vulnerability. Ordinary building are taking the most focus of researchers from all over the world because of the majority of building are reinforced concrete. But one of the most widely used structure system contains steel reinforced concrete (SRC) composite columns. This type has been used since early of 1950 and nowadays most high rise or non-prismatic buildings are built using SRC composite columns. This Experimental study presented addresses the seismic performance of (SRC) composite columns experiencing shear and flexural failures using different concrete grades and confinement details to mimic both existing buildings with old construction details and modern buildings designed and built according to modern codes and construction practices. Test specimens represent exterior columns modeled based on a typical seismic design of a 30-story prototype new core wall-frame tall building and a 20-story prototype gravity existing building. Test parameters considered in this study are target failure mode, axial load ratio, percentage of longitudinal steel, structural steel section, concrete grade, and the transverse reinforcement volumetric ratio. Tests aim to characterize and compare the cyclic response of SRC columns with old and modern construction details. In particular, shear capacity, flexural capacity, residual axial capacity, deformation capacity and engineering demand parameters under different test variables are sought. Backbone curves for numerical simulation of seismic performance of SRC columns are presented. There are fourteen tested specimens divided to three groups; four specimens were tested as pilot, three specimens were tested representing modern building flexure deficient column and seven specimens for old building: five shear deficient specimens and two flexure deficient specimens. This work came out with many conclusions and recommendations for old and modern buildings to overcome the deficiency of SRC composite column. Retrofitting shear deficient SRC columns under high axial loads (>40%) and flexure deficient columns under high axial loads (higher than the balanced load, i.e. compression controlled failure) experiencing moderate to strong ground shaking seems inevitable.
Accuracy Of Seismic Performance Methodologies For Rectangular Reinforced Concrete Columns
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Author : Myles M. Parrish
language : en
Publisher:
Release Date : 2001
Accuracy Of Seismic Performance Methodologies For Rectangular Reinforced Concrete Columns written by Myles M. Parrish and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Columns, Concrete categories.