圆截面型钢不同强度混凝土巨柱的抗震性能  

Seismic performance of circular H-section SRC mega columns with different concrete strength

作　　者：董宏英[1] 郭华镇 曹万林[1] 赵洋[1] 陈钱佳 宋钰[1] DONG Hongying;GUO Huazhen;CAO Wanlin;ZHAO Yang;CHEN Qianjia;SONG Yu(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,北京100124

出　　处：《地震工程与工程振动》2021年第2期35-42,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52078014)。

摘　　要：结合国内某超高层建筑型钢混凝土巨型柱为工程背景,进行了2个圆截面内置H型钢混凝土巨型柱试件的低周反复荷载试验,2个试件混凝土强度等级分别为C70和C50,截面尺寸、配钢率及配筋率等完全一致。研究了混凝土强度对其抗震性能的影响,比较分析了2个试件的破坏特征、滞回曲线、承载力、变形、刚度退化过程及耗能,推导了承载力计算公式,采用ABAQUS软件进行了有限元模拟。结果表明:2个试件最终呈现出以弯曲为主的破坏特征;滞回曲线均较为饱满,承载力下降缓慢,极限位移角达到5%,表现出良好的耗能能力和抗震性能;混凝土强度较高的试件承载力较高,刚度退化较慢,具有更好的抗震耗能性能;承载力计算结果及有限元数值模拟结果均与实测符合较好。Combined with the practical engineering background of SRC mega columns in a super high-rise building in China,the low cyclic loading tests of 2 circular H-section SRC mega columns specimens were carried out.The concrete strength of the 2 specimens is C70 and C50,respectively.The section size,steel distribution ratio,and reinforcement ratio are the same for all specimens.The influence of concrete strength on the seismic performance is studied.And the failure characteristics,hysteresis curves,bearing capacity,deformation,stiffness degradation process and energy dissipation of the 2 specimens are compared and discussed.The calculation formula of bearing capacity is improved,and the finite element simulation is carried out by ABAQUS software.Results show that the ultimate failure characteristics of the 2 specimens are mainly bending;the hysteretic curves are relatively full,the bearing capacity decreases slowly,and the ultimate drift angle reaches 5%,which shows good energy dissipation capacity and seismic capacity;the bearing capacity of the specimen with higher concrete strength is higher,its stiffness degradation is slower,and has better seismic energy dissipation capacity.The bearing capacity calculation results and the numerical simulation results are in good agreement with the test results.

关 键 词：圆截面 H型钢混凝土 混凝土强度 抗震性能 试验研究 

分 类 号：TU398[建筑科学—结构工程] X9[环境科学与工程—安全科学]