建筑结构学报2018，Vol.39Issue(1)：52-60,9.DOI:10.14006/j.jzjgxb.2018.01.007
双向加载路径下型钢-混凝土组合柱抗震性能试验研究
Experimental study on seismic behavior of steel-concrete composite columns under bidirectional loading paths
摘要
Abstract
The behavior of 8 steel-concrete composite columns was investigated experimentally under low cyclic loading.The effects of the steel configuration and loading path on the failure process,hysteretic characteristics,stiffness degradation,ductility and cumulative energy dissipation were studied,as well as the stress level of the longitudinal reinforcing bars and steel.The research results indicate that at the same steel ratio the deformation capacity of square steel tube reinforced concrete columns is better than that of cross steel reinforced concrete columns,and the ultimate failure drift ratio is increased by 24％ approximately.Loading paths can affect hysteretic characteristics of the specimens significantly.Under asymmetrical loading path,hysteretic characteristics of the specimens are also asymmetry.Compared with specimens under unidirectional cyclic loading,specimens subjected to bidirectional cyclic loading have small peak load,fast stiffness degradation,small yielding displacement,poor ductility and small ultimate failure drift ratio.However,cumulative energy dissipation of specimens under bidirectional cyclic loading is larger than those under unidirectional cyclic loading.Longitudinal reinforcement yielding occurs before the peak load,while steel yielding occurs at the peak load.During late displacement loading,strain of longitudinal reinforcing bars and steel of bidirectional loading specimens increase faster than those of specimens subjected to unidirectional loading.Therefore,the bidirectional loading path has great influence on the seismic performance such as load carrying capacity,deformation performance and cumulative energy dissipation,which should be considered in the design.关键词
型钢-混凝土组合柱/高强混凝土/低周往复加载试验/双向加载/耦合作用/抗震性能Key words
steel-concrete composite column/high-strength concrete/low cycle loading test/bidirectional loading/coupling effect/seismic behavior分类
建筑与水利引用本文复制引用
王朋,史庆轩,王峰,张挺..双向加载路径下型钢-混凝土组合柱抗震性能试验研究[J].建筑结构学报,2018,39(1):52-60,9.基金项目
国家自然科学基金项目(51608434,51478382),陕西省自然科学基础研究计划项目(2016JQ5082),陕西省高校科协青年人才托举计划项目(20160219). （51608434,51478382）
