摘要
为研究顶底角钢自复位梁柱节点在主余震作用下的抗震性能,通过连续的拟静力试验加载以模拟主余震作用,分析了节点的滞回性能、承载力、初始转动刚度、耗能能力、残余变形及钢绞线拉力,并通过有限元分析比较了顶底角钢半刚性节点与自复位节点在重复循环荷载作用下的抗震性能。研究结果表明:顶底角钢自复位节点在主余震作用下依然具有损伤可控性,塑性变形仅存在于角钢中;相比于单独主震的情况,主余震作用会明显降低节点的耗能能力及初始转动刚度,且节点经历的主震强度越大其在余震作用下的总体抗弯能力会越低;与相同尺寸的顶底角钢半刚性节点相比,顶底角钢自复位节点在单独主震与主余震作用下的抗震能力均更优。
To investigate the seismic behavior of self-centering beam-to-column connections with top-and-seat angles under mainshock-aftershock sequences,continuous pseudo static tests on an experimental specimen were conducted.The hysteretic performance,bearing and energy dissipation capacities,initial rotational stiffness,residual deformation,and strand tension of the specimen were analyzed,respectively.The seismic performance of a semi-rigid connection with top-and-seat angles was compared with that of the self-centering connection using the method of finite element simulation.It was shown that plastic deformation is only found in the angles of the specimen,which indicates that the connection has damage controllability under mainshock-aftershock sequences.Compared with the single main shock,the hysteretic performance,energy dissipation capacity,and initial rotational stiffness of the connection are significantly reduced under the action of mainshock-aftershock sequences,while the tension of steel strands is less affected.The higher the main shock intensity is,the smaller the bearing capacity of the connection is under the aftershock.Compared with semi-rigid connections with top-and-seat angles,the self-centering connection has better seismic performance whether under the action of a single main shock or mainshock-aftershock sequences.
作者
俞昊然
李维滨
郎泰申
郑鑫
YU Haoran;LI Weibin;LANG Taishen;ZHENG Xin(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第12期238-246,共9页
Journal of Vibration and Shock
基金
江苏高校优势学科建设工程资助项目(CE02-1-51)。
关键词
自复位梁柱节点
主余震
拟静力试验
抗震性能
顶底角钢
预应力钢绞线
self-centering beam-to-column connection
mainshock-aftershock sequences
pseudo static test
seismic behavior
top-and-seat angles
prestressed strand
