摘要
通过2个基于目标位移角分别为1.0%和1.5%设计的、轴压比为0.4的T形截面剪力墙拟静力试验,研究T形截面剪力墙基于目标位移角设计方法的有效性,以及研究基于不同目标位移角设计的剪力墙的破坏形态、滞回性能及变形能力等抗震性能。试验结果表明:2个试件的破坏形态均为压弯破坏,受拉端纵筋屈服,腹板端混凝土压溃及纵筋压曲、拉断,翼缘端少量混凝土保护层脱落;试件的顶点水平力-位移滞回曲线较为饱满,峰值承载力试验值大于规范计算值,翼缘受拉时承载力更大,翼缘受压时等效刚度退化较缓慢;试件翼缘端未设置约束边缘构件,腹板端约束边缘构件的长度小于现行规范的规定,2个试件的极限位移角试验值分别为按材料强度实测值计算的目标位移角的1.33倍和1.25倍;可采用基于目标位移角的方法,设计高轴压比T形截面剪力墙约束边缘构件的长度及配箍特征值。
In order to study the effectiveness of the design method of target drift ratio,as well as the seismic behavior of shear wall based on different target drift design,such as failure mode,hysteretic performance and deformation capacity,two T-shaped shear walls with axial load ratio of 0.4 and target drift design of 1.0%and 1.5%were tested under cyclic loading.The test results showed that the failure modes of the two specimens were flexure failure,the longitudinal reinforcement at the tension end yielded,the concrete crushed and the longitudinal reinforcement buckled and fractured at the web end,and only minor spalling of cover concrete at both ends of the flange was observed.The horizontal force-displacement hysteretic curve of the specimen is relatively full,the test value of the peak bearing capacity is greater than the value calculated by the code,the bearing capacity is larger when the flange is under tension,while the equivalent stiffness degradation is slower when the flange is under compression.No boundary elements were provided at the flange end,and the length of the boundary element at the web end was less than that specified in the current code.The ultimate drift ratio test values of the two specimens are 1.33 times and 1.25 times of the target drift ratio calculated according to the measured value of material strength.The method based on the target drift ratio can be used to design the length and hoop characteristic values of the boundary elements of the T-shaped section shear wall with high axial load.
作者
张微敬
柳超
闫怡雯
ZHANG Weijing;LIU Chao;YAN Yiwen(Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124)
出处
《地震工程与工程振动》
CSCD
北大核心
2019年第5期113-120,共8页
Earthquake Engineering and Engineering Dynamics
基金
城市与工程安全减灾教育部重点实验室和工程抗震与结构诊治
北京市重点实验室项目(USDE201402)
北京工业大学国际科研合作种子基金项目(2018A5)~~
关键词
目标位移角
T形截面剪力墙
高轴压比
拟静力试验
抗震性能
target drift ratio
T-shaped section shear walls
high axial ratio
cyclic loading test
seismic behavior
