Q345FR和Q460FR焊接箱形截面柱抗震性能研究  

Research on seismic performance of weld box-shaped columns fabricated of Q345FR and Q460FR steel

作　　者：王彦博[1,2] 许司仪 海乐天 WANG Yanbo;XU Siyi;HAI Letian(College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家实验室,上海200092 [3]重庆交通大学土木工程学院,重庆400074 [4]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2024年第12期111-124,共14页Journal of Building Structures

基　　金：国家自然科学基金面上项目(51878474)。

摘　　要：为推动耐火钢在抗震设防区的应用,开展Q345FR和Q460FR两种耐火钢焊接箱形截面柱的抗震性能试验研究,并采用经试验验证的有限元模型,对耐火钢箱形截面柱的抗震性能进行影响参数分析,研究长细比、轴压比和板件宽厚比等参数对其抗震性能指标的影响。结果表明:耐火钢材随着塑性累积发生循环软化;截面类型属于GB 50011—2010《建筑抗震设计规范》中“一级抗震”的耐火钢箱形截面柱,破坏模式为板件弹塑性局部屈曲,且滞回曲线饱满,极限层间位移角大于GB 50011—2010中规定的限值,具有良好的抗震性能和变形能力;耐火钢柱的抗震性能与已有的Q460C高强钢焊接截面柱抗震性能研究结果较为接近;轴压比和板件宽厚比的增大能够显著降低耐火钢柱的受弯承载性能与耗能能力。基于试验和有限元分析结果,建立了Q345FR和Q460FR耐火钢箱形截面柱的正则化柱底弯矩-曲率理论模型,模型中考虑了累积损伤效应,且能够反映轴压比和板件宽厚比的影响,可较为准确地预测耐火钢柱的滞回性能。This paper conducted an experimental study on seismic performance of weld box-shaped columns made of Q345FR and Q460FR fire-resistant steels to enhance the application of fire-resistant steel structure in seismic regions.Through a validated numerical model,a parametric study was subsequently performed to clarify the influence of axial load ratio,slenderness and plate width-to-thickness ratio on the seismic behavior.The fire-resistant steels demonstrate an obvious cyclic-softening behavior.Columns with cross-section of‘Level 1’in GB 50011—2010 exhibit a failure mode of elastic-plastic local buckling in plate components.The hysteretic curves and drift angle are favorable for utilization in steel frames.The columns studied herein exhibit similar seismic performance with that of existing Q460C weld columns.The increase in plate slenderness and axial load ratio tends to decrease the flexural capacity and energy-dissipation ability.Based on the test and numerical results,a normalized hysteretic model for the columns was established studied.The proposed model can provide a reasonable prediction accuracy due to the consideration of cumulative damage,axial load ratio and plate slenderness.

关 键 词：耐火钢结构 Q345FR钢 Q460FR钢 箱形截面柱 有限元分析 抗震性能 滞回模型 

分 类 号：TU391[建筑科学—结构工程]