不同加载路径下外露式钢柱脚抗震性能数值模拟分析  

Numerical simulation analysis of seismic performance of exposed steel column base under different loading paths

作　　者：杨晨潇 钟燕 于新[2] 崔瑶[1] YANG Chenxiao;ZHONG Yan;YU Xin;CUI Yao(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;School of Civil Engineering,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室,辽宁大连116024 [2]辽宁科技大学土木工程学院,辽宁鞍山114051

出　　处：《世界地震工程》2025年第1期145-153,共9页World Earthquake Engineering

基　　金：柱脚抬升式摇摆钢框架整体抗震性能及设计方法研究(ZX20230719)。

摘　　要：通过精细化有限元模型模拟了工字形截面外露式钢柱脚在不同加载路径下的滞回性能。首先将试验数据与有限元计算结果进行对比分析,验证有限元结果的准确性。以加载角度0°、15°、30°、45°、60°、75°、90°以及方形加载、菱形加载、圆形加载、蝶形加载为参数共进行了11组模拟。模拟结果表明:柱脚的破坏模式与加载路径相关,单向加载中,0°加载的滞回曲线主要呈现旗帜型,90°加载时由于弱轴侧钢柱翼缘底部出现损伤,滞回曲线主要呈梭型,随着加载角度的增加,滞回曲线逐渐由旗帜型转变为梭型;双向加载中,相比于蝶形加载,方形加载承载力降低7%,延性更差,等效黏滞阻尼系数相差不大,而菱形和圆形加载相对于蝶形加载,承载力一致,等效黏滞阻尼系数较小,但延性更好。The hysteresis performance of I-section exposed steel column base under different loading paths was simulated by refined finite element model.The tests data were firstly compared and analysed with the finite element calculations results to verify the accuracy of the finite element results.A total of 11 sets of simulations were carried out with the loading angles of 0°,15°,30°,45°,60°,75°,90°,and the parameters of square loading,rhombus loading,circle loading and butterfly loading.The simulation results show that the damage mode of the column base is related to the loading path,in unidirectional loading,the hysteresis curve of 0°loading mainly shows flag type,and the hysteresis curve mainly shows shuttle type due to the damage at the bottom of the weak-axis side of the column flange when loading at 90°,and the hysteresis curve is gradually transformed from flag type to shuttle type with the increase of the loading angle.In bi-directional loading,compared with butterfly loading,square loading has 7%lower load capacity and worse ductility,with little difference in equivalent viscous damping coefficient,while rhombus and circle loading have the same load capacity and smaller equivalent viscous damping coefficient relative to butterfly loading,but better ductility.

关 键 词：外露式柱脚 加载路径 蝶形加载 抗震性能 数值模拟 

分 类 号：TU391[建筑科学—结构工程]