外伸端板SMA螺栓连接自复位钢框架去柱抗倒塌性能分析  

Collapse resistance of the self-centering steel frame by extended end-plate connections equipped with shape memory alloy bolts under a column removal scenario

作　　者：刘文渊[1,2] 冷捷 陈力[2,3] Liu Wenyuan;Leng Jie;Chen Li(Taizhou Institute of Science and Technology,Nanjing University of Science and Technology,Taizhou 225300,China;Sate Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University,Nanjing 210007,China;School of Civil Engineering of Southeast University,Nanjing 211810,China)

机构地区：[1]南京理工大学泰州科技学院,江苏泰州225300 [2]陆军工程大学爆炸冲击与防灾减灾国家重点实验室,江苏南京210007 [3]东南大学土木工程学院,江苏南京211810

出　　处：《建筑科学》2020年第3期25-32,共8页Building Science

基　　金：国家重点研发计划(2016YFC0305200);江苏省自然科学基金(BK20161369);江苏高校“青蓝工程”(2017)。

摘　　要：为明晰外伸端板形状记忆金属(Shape memory alloy,简称SMA)螺栓梁柱连接自复位钢框架去柱后结构的抗倒塌性能,采用ANSYS软件建立了梁、实体混合单元模型。在验证有限元模型合理的基础上,进行外伸端板SMA螺栓、高强度螺栓柱连接去柱子结构竖向加载分析,并对比两类试件的受力性能及复位效果。研究表明:两类试件应力(应变)分布相似,且应力集中在外伸端板上侧及梁翼缘与端板连接处;中柱竖向力-位移曲线呈三段式分布,SMA螺栓连接试件加载后期悬链作用显著,且竖向承载力高于高强度螺栓连接试件;SMA螺栓连接可有效减小结构残余变形,降低结构的修复难度,提高修复的经济性。To investigate the collapse resistance of the self-centering steel frame by extended end-plate connections equipped with shape memory alloy bolts subjected to sudden column removal scenario,finite element model with beam and solid mixture elements is carried out using ANSYS software. After the rationality of the finite element model is verified,the beam-column connection substructures of steel frame equipped with shape memory alloy bolts and high strength steel bolts are designed,and analyzed under a column removal scenario by nonlinear static analysis. Then the mechanical performances and self-centering effect of the two specimens are compared. The results indicate that the stress( strain) distribution of both specimens is similar,and the stress is concentrated on the top side of the extended end plate and connection between beam flange and end plate. The vertical forcedisplacement curve of the middle column shows a three-segment distribution,the catenary effect of the SMA bolt connection specimens is significant at the last loading stage,and the vertical bearing capacity is higher than the high strength bolted connection specimen. Connection with shape memory alloy bolts can effectively eliminate the residual deformation,reduce the difficulty of repairing,and improve the economy of repairing.

关 键 词：形状记忆金属 外伸端板连接 自复位钢框架 悬链作用 抗倒塌性能 

分 类 号：TU352.1[建筑科学—结构工程]