部分包覆钢-混凝土十字形和T形截面组合柱抗震性能及轴压比限值分析  

Seismic performance and limit values of axial ratio for partially encased composite steel-concrete cross-shaped and T-shaped section columns

作　　者：李补拴 周伟 赵根田 祁德志[1] 李雨颉 LI Bushuan;ZHOU Wei;ZHAO Gentian;QI Dezhi;LI Yujie(School of Civil Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010 [2]内蒙古科技大学内蒙古自治区土木工程安全与耐久重点实验室,内蒙古包头014010

出　　处：《建筑结构学报》2023年第8期99-109,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51268042,52168024);内蒙古科技大学创新基金项目(2019QDL-S08);内蒙古科技大学建筑科学研究所开放基金项目(JYSJJ-2021M15)。

摘　　要：为解决传统矩形截面柱柱楞突出墙面及柱梁在弱轴方向连接的复杂问题,以试验轴压比为参数,完成了3个十字形和3个T形截面的部分包覆钢-混凝土组合柱拟静力试验,分析其破坏形态和抗震性能指标。建立ABAQUS数值分析模型,并以加载角度、轴压比为参数开展轴压比限值分析。研究结果表明:两类异形截面柱最终均呈现压弯破坏,滞回曲线饱满,承载力稳定,延性和耗能性能良好;十字形和T形截面柱最不利加载角度均为45°。提出了部分包覆钢-混凝土组合柱的试验轴压比与设计轴压比换算关系,以位移延性系数为衡量标准,在抗震等级为一、二、三级时,建议十字形截面柱的设计轴压比限值分别取0.6、0.7、0.8,T形截面柱分别取0.35、0.45、0.55。To solve the complex problems of traditional rectangular section columns protruding from the wall and beam-column connection in the weak axis direction,the quasi-static tests were completed with three cross-shaped and three T-shaped sections partially encased composite steel-concrete columns with the test axial compression ratio as the variable parameter.The damage patterns and seismic performance indexes were analyzed.The numerical analysis model was established by ABAQUS,and the axial compression ratio limits were analyzed considering the loading angle and axial compression ratio as parameters.The research results show that the final damage pattern of both types of columns exhibit compression-bending damage,the hysteresis curves are plump,the bearing capacity is stable,and ductility and energy dissipation performance are excellent.The least favorable loading angle is found at 45°for columns with cross-shaped and T-shaped sections.The conversion relationship between tested and design axial compression ratios for partially encased composite steel-concrete columns was proposed.Using the displacement ductility coefficient as a measure,it is suggested that when the seismic classes areⅠ,ⅡandⅢ,the design axial compression ratio limits are 0.6,0.7 and 0.8 for cross-section columns while 0.35,0.45,and 0.55 for T-section columns,respectively.

关 键 词：部分包覆混凝土组合柱 异形截面 有限元模拟 抗震性能 轴压比限值 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1TU311.41