Research on damage behavior and quantitative indexes for #br# steel reinforced concrete column with irregular section
Xue Jianyang1,2 Zhou Chaofeng1,3 Liu Zuqiang1,2 Du Zhenyu1
1. College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. Key Lab of Structural Engineering and Earthquake Resistance of the Ministry of Education, Xi’an University of Architecture
and Technology, Xi’an 710055, China;3. Henan University of Technology, Zhengzhou 450001, China
Abstract： In order to study the damage behavior of steel reinforced concrete (SRC) columns with irregular section under different horizontal loadings, the experiment research was carried out on 15 SRC with irregular section columns, including 9 T-shaped section columns, 3 L-shaped section columns and 3 +shaped section columns.The loading scheme by parallel four-connecting rods device was used, in which the axial compression ratio and steel ratio were taken as the analysis parameters.The failure modes of specimens were observed and the loading-displacement (P-Δ) curve were analyzed.The test results indicate that the specimens mainly show bending failure accompanied by bond failure.The loading-displacement curve is full and symmetrical without obvious pinch under the low cyclic reversed loading.The ductility coefficient ranges from 4.16 to 9.44, indicating that these specimens have excellent deformation ability, especially the specimen under the monotonous loading. Based on the experiment results, a damage model with double parameter was proposed by considering the effect of concrete cracking, loading path and effective energy consumption on the damage, and the damage index at each characteristic point was calculated.Meanwhile, the seismic performance level for SRC with irregular section column was divided into five levels, namely normal use, basically normal use, temporary use, post-repair use, near severe damage.According to the statistical analysis of displacement ratio at each characteristic point for 41 SRC with irregular section columns, the quantitative index of displacement ratio and corresponding limitvalue of damage index are established for different seismic performance levels.The research results can provide reference for the design based on the seismic performance and the post-earthquake repair.
