Q690D钢材箱形截面框架柱抗震性能  

Seismic Performance of Q690D Steel Box-section Frame Columns

作　　者：杨志军 王彦博[2] 杨国涛 YANG Zhijun;WANG Yanbo;YANG Guotao(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520 [2]同济大学土木工程学院,上海200092

出　　处：《湖南大学学报（自然科学版）》2023年第9期69-78,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51978351);同济大学土木工程防灾国家重点实验室开放基金项目(SLDRCE17-02)。

摘　　要：为了评价Q690D钢材箱形截面框架柱的抗震性能,在对3个焊接箱形截面钢柱进行低周往复加载试验的基础上,利用经试验结果验证的有限元建模方法,建立30个覆盖4个抗震等级的不同板件宽厚比的有限元数值模型,分别从滞回反应、骨架曲线、延性系数以及塑性发展等方面进行抗震性能分析.结果表明,Q690D钢材箱形截面框架柱的延性系数较小,在1.68~2.55之间,当轴压比较大时,极限层间位移角会出现小于0.02的情况,不能满足《建筑抗震设计规范》(GB 50011—2010)中对钢结构弹塑性位移角限值1/50的要求,在高强钢应用于抗震设计时建议限制轴压比最大不超过0.5;截面塑性发展系数以及构件延性会随着壁板宽厚比以及轴压比的增大而减小.《建筑抗震设计规范》(GB 50011—2010)仅采用壁板宽厚比来区分抗震等级是不合理的,需考虑轴压比不同对抗震性能的影响.To evaluate the seismic performance of Q690D steel box-section frame columns,based on a lowcycle horizontal reciprocating loading test on three welded box-section steel columns,the finite element modeling method verified by the test results was used to establish 30 FE models with different width-to-thickness ratios under four seismic grades.The seismic performance was analyzed from the aspects of the hysteretic response,skeleton curve,ductility coefficient,and the development of cross-section plasticity.The results show that the ductility coefficient of the Q690D steel box-section frame column is small,which is between 1.68 and 2.55.When the axial compression ratio is large,the ultimate inter-story drift angle is less than 0.02,which does not meet the required limit value of 1/50 of elastic-plastic drift angle in GB 50011―2010 Code for Seismic Design of Buildings.So,it is recommended that the limit value of the axial compression ratio should not exceed 0.5 in seismic design for high-strength steel structures.The plastic development coefficient and component ductility decrease with the increase of width-to-thickness ratio and axial compression ratio.It is unreasonable that the seismic code only uses the width-tothickness ratio as the only factor to distinguish the seismic grade,and the influence of the axial compression ratio on seismic performance needs to be considered.

关 键 词：高强钢 箱形截面 宽厚比 轴压比 抗震反应 

分 类 号：TU391[建筑科学—结构工程]