The purpose of this study is to investigate the seismic performance of reinforced concrete bridge columns that have lap splices in the plastic hinge region when subjected to impulsive near-fault ground motions. For this purpose, the paper presents the results of shaking table tests on four reinforced concrete bridge columns. By using a sophisticated non-linear finite-element analysis program, the accuracy and objectivity of the assessment process can be enhanced. A computer program, the RCAHEST (reinforced concrete analysis in higher evaluation system technology), was used for the analysis of reinforced concrete structures. A lap-spliced bar element was used to predict the inelastic behaviours of lap splices. The solution to the seismic response of reinforced concrete bridge columns was obtained by numerical integration of the non-linear equations of motion using the Hilber–Hughes–Taylor (HHT) algorithm. The proposed numerical method for the seismic performance assessment of reinforced concrete bridge col...
The current paper aims to assess analytically the seismic performance of reinforced concrete bridge columns under variable axial load. Variable axial load is very important to the ductility, strength, stiffness and energy dissipation of reinforced concrete bridge columns. The effects of variable axial loads on bridge columns are analysed to obtain a more realistic characterisation of the actual performance and capacity of bridge columns. A computer program, RCAHEST (reinforced concrete analysis ...
Last. H.M. Shin(SKKU: Sungkyunkwan University)H-Index: 1
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This study aims to analytically assess the seismic performance of reinforced concrete bridge piers with lap splices in longitudinal reinforcing bars, and to provide data for developing improved seismic design criteria. The accuracy and objectivity of the assessment process can be enhanced by using a sophisticated nonlinear finite element analysis program. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), is used to analyze reinforced concrete stru...
Last. Hyun-Mock Shin(SKKU: Sungkyunkwan University)H-Index: 8
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This paper presents a nonlinear finite element analysis procedure for the seismic damage assessment of reinforced concrete bridge columns. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. A damage index based on the predicted hysteretic behavior of a reinforced concrete bridge column is defined. Damage indices aim to provide a means of quantifying numerically the damage in reinfor...
Last. Hyun Mock Shin(SKKU: Sungkyunkwan University)H-Index: 9
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Analytical models for the inelastic behavior and ductility capacity of reinforced concrete bridge piers under earthquake are presented. The models for material nonlinearity include tensile, compressive, and shear models for cracked concrete and a model of reinforcing steel where the smeared crack approach is incorporated. An interface element is used to account for local discontinuous deformations at the boundary plane caused by abrupt changes in stiffness where members with different thicknesse...
This research sought a solution to reduce residual displacements of reinforced concrete (RC) bridge piers after earthquake excitations. Because prestressed concrete (PC) members normally show recovery from elastic stiffness during unloading, this work proposes the possibility of using PC to minimize the residual displacements. However, prestressed members will have reduced ductility. Therefore, a new technique that employs partially prestressed concrete (PPC) for the bridge piers is examined in ...
This paper discusses results of dynamic tests on 6 half-scale reinforced concrete bridge column-cap beam joints. The loading protocol used included the effects of impulsive near-field ground motions. Cyclic loading with increasing amplitudes followed this impulsive loading. Three of the specimens incorporated nominally ductile reinforcement details typical of pre-1971 construction practice in California. The other 3 specimens incorporated ductile reinforcement details typical of current design p...
In spite of important differences in structural response to near-fault and far-fault ground motions, this paper aims at extending well-known concepts and results, based on elastic and inelastic response spectra for far-fault motions, to near-fault motions. Compared are certain aspects of the response of elastic and inelastic SDF systems to the two types of motions in the context of the acceleration-, velocity-, and displacement-sensitive regions of the response spectrum, leading to the following...
This paper describes an experimental investigation into the behavior of short reinforced high-strength concrete columns. Thirty reinforced concrete columns, either 240 mm diameter circular or 240 mm square and 720 mm high, containing different confining reinforcement configurations, yield strengths of transverse reinforcement, and concrete compressive strengths, were subjected to concentric loads to failure at different strain rates. Results presented include an assessment of the effect of strai...
This study was conducted to investigate the flexural and shear performance of older columns for purposes of seismic assessment and retrofit design, particularly with regard to assessing the residual strengths present in degraded hinge regions. In this first of a two-part paper, experimental observations and results of tests on eight reduced-scale specimens that incorporated deficiencies present in older bridge columns are presented. The columns were fixed against rotation at both the top and bot...
The purpose of this study is to assess the seismic performance of reinforced concrete wall piers for out-of-plane seismic loads, and to provide a method for developing a new evaluation procedure. A...
The aim of this study is to analytically assess the seismic performance of hollow reinforced-concrete bridge columns using a novel damage index, and to provide data for developing next generation d...
Last. Katrin Beyer(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 22
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Spliced longitudinal reinforcement may result in a reduction of both strength and displacement capacity of reinforced concrete (RC) members. This applies in particular when lap splices are located in regions where inelastic deformations concentrate, such as the plastic zone at the base of RC walls. This paper introduces a simple numerical model suitable for engineering practice to simulate the force-displacement response of RC walls with lap splices. Based on experimental data from 16 test units...
The purpose of this study was to investigate the seismic performance of novel hollow and solid reinforced-concrete (RC) columns with triangular reinforcement details when subjected to impulsive near-fault ground motions. The results of numerical simulations of shaking table tests on six hollow columns and six solid columns are presented. The developed reinforcement details are shown to be economically feasible and rational, and they facilitate shorter construction periods. The use of a sophistic...
This study investigates the seismic performance of new hollow reinforced concrete (RC) bridge piers with triangular reinforcement details. The developed triangular reinforcement details are economically feasible and rational, and facilitate shorter construction periods. We tested a model of new hollow RC bridge piers with triangular reinforcement details under a constant axial load and a quasi-static, cyclically reversed horizontal load. We used a computer program, Reinforced Concrete Analysis i...
This study investigates the performance of advanced hollow reinforced concrete (RC) bridge column sections with triangular reinforcement details. Hollow column sections are based on economic considerations of cost savings associated with reduced material and design moments, as against increased construction complexity, and hence increased labor costs. The proposed innovative reinforcement details are economically feasible and rational, and facilitate shorter construction periods. We tested a mod...
The purpose of this study is to investigate the behavior characteristics of new hollow reinforced concrete (RC) bridge pier sections with triangular reinforcement details and to provide the details and reference data. Among the numerous parameters, this study concentrates on the shape of the section, the reinforcement details and the spacing of the transverse reinforcement. Additional eight column section specimens were tested under quasi-static monotonic loading. In this study, the computer pro...
#2Jang-Woon Baek(SNU: Seoul National University)H-Index: 1
Last. Hyun-Mock Shin(SNU: Seoul National University)H-Index: 2
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In the construction of nuclear power plants using massive walls, the use of high-strength reinforcing bars for shear design is necessary to enhance the constructibility and economy. In this study, low-rise walls (aspect ratio of 1.0) with Grade 550 MPa (80 ksi) reinforcing bars were tested to investigate the shear capacity and deformation capacity under cyclic loading. The test parameters were the grade of horizontal reinforcement, concrete strength, web bar ratios, use of boundary hoop, shape o...