This research is a part of a research program to verify the seismic performance of circular reinforced concrete bridge columns with respect to longitudinal steel ratio and transverse steel ratio under cyclic lateral load. In this paper, describes mainly displacement ductility of circular reinforced concrete bridge columns with respect to test variables.

This research is a part of a research program to verify the flexural shear behavior of circular reinforced concrete bridge columns with respect to longitudinal steel ratio and transverse steel ratio under cyclic lateral load. In this paper, describes mainly failure behavior of circular reinforced concrete bridge columns with respect to test variables.

The purpose of this study was to evaluate the seismic performance of high-performance steel. For this study, the hysteretic behavior and deformation shape of steel beam-to-column connections with SM570TMC was investigated using non-linear finite element analysis. The non-linear finite element analysis was carried out using ANSYS. The displacement analysis of steel beam-to-column connections was conducted according to the qualifying procedures of current korean building code(KBC2009).

To evaluate the ductility of high strength steel beam-to-column connections, Cycle loading connection test was conducted targeting HSA800 steel being developed in Korea and parameter is connection details. According to the study, The non-scallop detail and improved horizontal rib reinforcement detail used in this study enhanced deformation capacity of high strength steel connections which have brittle tendency by stress relaxation.

Connection details were developed for the composite column using high strength steel angles. Load-carrying capacity, deformation capacity, and load transfer mechanism of three beam-to-column joint specimens were evaluated under cyclic load tests. In the experiments, mega columns were used for the application in high-rise buildings

Under cyclic loading, the shear capacity of reinforced concrete (RC) beam-column connections is significantly decreased by the joint bond-slip and shear cracking as deformation increases. In the present study, Joint shear strength model on the basis of bond-slip was developed to evaluate deformability at the joint shear failure.

In this study, experimental research was carried out to study the high strength RC exterior beam-column joints regions, without the shear reinforcement, using high ductile fiber-reinforced mortar. Test results showed that specimen BCJNSP1.0 were increased th maximum load-carrying capacity and showed stable hysteresis behavior and satisfactory crack pattern in comparison with th specimen BCJNS without shear reinforcement in the beam-column joint region.

In this study, experimental research was carried out to study the high strength RC exterior beam-column joints regions, without the shear reinforcement, using high ductile fiber-reinforced mortar. Specimens designed by retrofitting the exterior beam-column joint regions of existing reinforced concrete building showed a stable mode of failure and an increase in shear strength capacity due to the effect of enhancing dispersion of crack control at the time of initial loading and bridging of fiber from retrofitting new high ductile materials during testing.

To evaluate the confinement effect of aramid sheet in RC column end, structural tests are performed. Test variables are aramid sheet warping length as 300mm, 600mm. From test results, aramid sheet warped 600mm specimen shows good performance in strength capacity and ductile behavior

To evaluate the resistance performance of RC building, progressive collapse analyses are conducted with the parameters of reinforcement patterns. Especially, these analyses use Reinforcement Contact function in Ansys Workbench to reduce the quantity of elements and analysis time. This method can be an effective technique to analyze large scale structures

In this paper, a moment resisting precast concrete beam-to-column connection is proposed for high seismic zones using bolt type connection. An experimental study was carried out to investigate the behavior of the proposed connection subjected to cyclic loading

The objective of this research is to evaluate the fireproof covering thickness of concrete-filled tube columns(CFT) by finite element results using ABAQUS package program. As a result of this study, there is a huge difference between the analytical results and Korean fire resistance criterion

Part of the domestic construction practice and non-destructive inspection technology world level is often inadequate to provide the test results to serve as a basis for evaluating the safety of the structure. Therefore, in this study, is intended to provide basic data for legislation nondestructive inspection in Japan, estimates the size of the column using a technique reverberation impact manufactured column member or this purpose. 3% maximum error rate, the result was 1% minimum error rate. The average error rate is 1.6%, revealed as well as the size of the columns that have been measured

형상비 4.5인 축소모형 원형기둥 실험체 8개를 제작하여 일정한 축력 하에서 반복횡하중을 가력하는 실험을 수행하였다. 실험체의 주요변수는 횡방향철근비, 축방향철근비 (2.017%, 3.161%), 축력비 (0, 0.07, 0.15)이다. 모든 실험체의 횡방향 나선철근 체적비는 소성힌지 구간에서 0.3352~0.8938%의 값을 갖는다. 이 값은 도로교설계기준에서 요구하는 최소 심부구속철근 요구량의 39.7~122.3%에 해당하며, 이는 내진설계가 되지 않은 기존 교각이나 내진설계개념으로 설계되는 교각을 나타낸다. 본 연구의 최종목적은 실험적 기초자료의 제공과 함께 성능단계별 균열, 철근의 항복, 파단 등 정량적 수치와 경향을 제공하기 위한 것이다. 본 논문에서는 실험결과를 통해 분석된 실험변수에 따른 교각의 파괴거동, 강도저감거동, 변위연성도에 대해 중점적으로 기술하였다.

In this study, experimental research was carried out to study the structural performance of slab-column joints designed by the application of reducing of joint regions damage using steel fiber reinforced concrete. Test results showed that specimens(RCFPS series) were increased the maximum load-carrying capacity by 1.12~1.23 times and showed stable hysteresis behavior in comparison with the standard specimen(SRCFP).

The objective of this research is to investigate the inelastic behaviour, failure mode and depth of neutral axis of square reinforced concrete bridge piers with hollow cross section under constant axial load. The nonlinear analysis computer program, named RCCOL, for the analysis of reinforced concrete column was used.

The objective of this research is to investigate the seismic performance of square reinforced concrete bridge piers with solid and hollow cross section. Test specimens were nonseismically designed with the aspect ratio 4.5 Two reinforced concrete columns were tested under constant axial load while subjected to lateral load reversals with increasing drift levels.

In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced concrete beam-column joint using carbon fiber sheets in existing reinforced concrete building. Test result shows that retrofitting specimen(LBCJ-CS1, CS2) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.26～1.35 times in comparison with the standard specimen.

본 연구에서는 비내진 교각의 내진성능과 휨-전단 거동을 파악하고자 형상비 4.5인 정사각형의 중실 및 중공단면 철근콘크리트 교각실험체를 제작하여 일정한 축력하에서 변위비 등급을 증가시켜 가면서 횡하중을 가력하는 실험을 수행하였다. 본 연구는 철근콘크리트 교각의 한정연성 내진설계를 위한 실험적 기초자료의 제공과 함께 성능단계별 교각성능 및 손상평가를 위한 정량적 수치와 경향을 제공하기 위한 것이며, 파괴거동, 극한변위, 극한드리프트비율, 변위연성도, 응답수정계수, 등가점성감쇠비, 잔류변형지수, 유효강성, 철근 변형률 등의 주요 내진성능 인자들에 대한 분석결과와 비선형 해석 결과를 나타내었다.