一种新型自复位耗能段的力学性能试验研究  

Experiment on the Mechanical Property of a Novel Self-centering Shear Link

作　　者：张波 贾益纲[2,3] 吴光宇 李大浪[1] 胡淑军 ZHANG Bo;JIA Yigang;WU Guangyu;LI Dalang;HU Shujun(China Nerin Engineering Co.,Ltd.,Nanchang 330036,China;Design and Research Institute of Nanchang University,Nanchang 330001,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]中国瑞林工程技术股份有限公司,南昌330036 [2]南昌大学设计研究院,南昌330001 [3]南昌大学工程建设学院,南昌330031

出　　处：《建筑钢结构进展》2024年第10期1-9,19,共10页Progress in Steel Building Structures

基　　金：国家自然科学基金(52468025,51908268);江西省自然科学基金(20224BAB204062)。

摘　　要：基于扩孔螺栓连接型耗能段和自复位SMA支撑,提出一种新型自复位耗能段,具有强耗能、高延性、低残余变形和低损伤等特点,可进一步提高偏心支撑结构的抗震性能和震后功能恢复能力。分别设计3个考虑摩擦滑移的自复位耗能段和1个普通自复位耗能段试验试件,并进行往复加载研究,得到其变形或破坏模式、滞回曲线和骨架曲线等。结果表明,滑移阶段耗能段处于相对静止状态,所有构件均处于弹性状态;非滑移阶段耗能段依次发生滑移、屈服、翼缘和腹板屈曲现象,整个过程中自复位SMA支撑中的SMA受拉,并为自复位耗能段提供承载力、耗能能力和复位力。自复位耗能段的骨架曲线主要包括弹性阶段、弹塑性阶段、强化阶段。最后,基于校正的有限元法对自复位耗能段进行分析,阐明自复位耗能段在不同阶段的耗能机理。A novel self-centering shear link(SC-SL)that has an advantage of good energy dissipation capacity,high ductility,low damage and low residual deformation was developed,which combines the advantages of very short shear link with shear slotted bolted connection(VSSL-SSBC)and self-centering SMA braces,so the seismic performance and seismic resilience capacity of eccentrically braced frame with SC-SL will be further improved.Cyclic tests were carried on three SC-SL specimens with friction slip and one SC-SL specimen with ultimate deformation,so the failure modes,hysteresis curves and skeleton curves can be obtained.The test results show that the very short shear link is in the relative static,and all the components in the SC-SL remain elastic during the slip stage.However,in the non-slip stage,four kinds of development process for very short shear link appear sequentially:slip,yield,flange buckling and web buckling.In the whole loading processes,the SMA in the self-centering SMA brace is always subjected to elongation,thus increasing the bearing capacity,energy dissipation capacity and self-centering capacity for SC-SL.As for the skeleton curve,the SC-SL mainly contains elastic,elastic-plastic and strengthening stage.Finally,the validated finite element method has been used to analyze the energy dissipation mechanism of SC-SL during different loading stages.

关 键 词：自复位耗能段 力学性能 剪切扩孔型螺栓连接 滞回曲线 耗能机理 

分 类 号：TU352.11[建筑科学—结构工程] TU391