方形截面钢构件基于应变的抗震性能评价指标研究  

Research on Seismic Performance Evaluation Indexes of Box-Section Steel Members Based on Strains

作　　者：王立波 舒赣平[1] 张谨 付亨利 陈展鹏 Libo Wang;Ganping Shu;Jin Zhang;Hengli Fu;Zhanpeng Chen(School of Civil Engineering,Southeast University,Nanjing 211189,China;ARTS Group Co.,Ltd.,Suzhou 215123,China)

机构地区：[1]东南大学土木工程学院,南京211189 [2]中衡设计集团股份有限公司,江苏苏州215123

出　　处：《钢结构(中英文)》2024年第12期20-28,共9页Steel Construction(Chinese & English)

摘　　要：为精确评估方形截面钢构件的变形能力,提出基于塑性区应变的抗震性能评价指标,对6个方形截面钢构件开展了低周往复试验,研究试件的破坏模式和滞回性能,提取试件极限变形和塑性区长度以获得试件应变延性系数。试验结果表明:所有试件破坏形式为翼缘和腹板依次出现局部屈曲变形,两者的变形过程相互协调;滞回曲线均呈梭形且较为饱满,耗能能力较好;方形截面钢构件极限应变和应变延性系数随着板件宽厚比和轴压比的增大逐渐减小。基于试验结果验证了有限元模型的有效性,通过开展参数化分析研究了翼缘宽厚比、腹板高宽比和轴压比对应变延性系数的影响。研究表明:方形截面钢构件应变延性系数随着翼缘宽厚比、腹板高厚比和轴压比的增大呈现下降趋势。通过回归分析提出应变延性系数的建议计算式,验证了计算式的有效性。The study aimed to evaluate the deformation capacity of box-section steel members.The strain ductility coefficient,a stain-based evaluation index,was proposed for box-section steel members.tests quasi-static were conducted oedsix box-section steed mombers,the experimental failure modes and hysteretic responses were investigated,and the ultimate deformation and plastic zome length of the specimers were extracted to obtain the strain dultility coefficients.The results show that the failure mode of all specimens involved local buckling deformation of both the flanges and webs,and the deformation processes of the two were coordinated with ench other.All specimens had full hysteresis curves with no significant pinching phenomenon,demonstrating good ductility and energy dissipation capacity.The ultimate strains and strain ductility coefficients of box sections decreased with the increase of the width-to-thickness ratio and axial compression ratio.Based on the test results,validated and reliable finite element models were established,and parametric studies were conducted to investigate the effects of flange width-to-thickness ratio,web height-to-thickness ratio,and axial compression ratio on the strain ductility coefficients.The results indicated that the strain ductility coefficients of box-section steel members exhibitsed a decreasing trend with the increase in flange width-to-thickness ratio,web height-to-thickness ratio,and axial compression ratio.The regression analysis was conducted to establish a calculation recommendation formula for the strain ductility coefficients.The validity of the formula was verified.

关 键 词：方形截面 应变延性系数 低周往复试验 宽厚比 轴压比 

分 类 号：TU391[建筑科学—结构工程] TU352.11