偏心支撑钢框架可替换剪切连接件试验研究  

Experimental study of replaceable shear links for eccentrically braced steel frames

作　　者：殷占忠[1,2] 李锦铭 董龙光 许继祥[1,2] YIN Zhanzhong;LI Jinming;DONG Longguang;XU Jixiang(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of China Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《建筑结构学报》2019年第9期157-165,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51368037,51568040);甘肃省高等学校基本科研业务费专项(1404ZTB256);甘肃省建设科技建筑节能项目(JK2014-11)

摘　　要：将偏心支撑钢框架中的耗能梁段从框架梁中分离,作为可替换剪切连接件,不仅能达到将结构塑性变形集中于耗能梁段区域的目的,也能实现震后损坏耗能梁段易于替换的目标。为此,对9根不同参数的可替换剪切连接件进行循环加载试验,并对剪切连接件的滞回曲线、骨架曲线、承载力、塑性转角及刚度退化等进行分析。结果表明:可替换剪切连接件的滞回曲线饱满,性能稳定,塑性转角均满足对于耗能梁段极限塑性转角大于0.08rad的限值要求,具有良好的塑性性能,满足罕遇地震作用下的变形要求;承载能力和初始刚度随着长度、加劲肋间距的减小而增大;有焊接工艺孔的连接件刚度退化更加明显,塑性性能得到充分发挥,耗能能力良好;通过参数分析发现截面尺寸、长度比、加劲肋间距及焊接工艺孔构造等是影响剪切连接件抗震性能的主要因素。The replaceable shear links are used as the energy dissipation beam section in the eccentrically braced steel frame and separate from the frame beam.Not only concentrated the inelastic deformation of structure on the energy dissipation beam section,but also achieved the goal that the damaged energy dissipation links can be replaced easily and the repair cost can be reduced after the earthquake.In this paper,the replaceable shear links are researched independently from eccentrically braced steel frames.The experimental study on nine replaceable shear links with different parameters under cyclic loading was carried out.The hysteretic loops,skeleton curve,bearing capacity,displacement ratio,and stiffness degradation of shear links were analyzed.The results show that the hysteretic loops of the replaceable shear links are full and stable.The plastic rotation angles are larger than the limit requirement of 0.08 rad for the energy-dissipating beam section under rare earthquakes,indicating good plastic properties.With the decrease of length and stiffener spacing,the bearing capacity and initial stiffness are improved.The existence of welding holes makes the plastic properties of the specimens be fully developed,so the stiffness degradation is more obvious and the energy dissipation performance is good.The influences of geometric parameters such as section dimension,length ratio,welding hole,and stiffener spacing on the seismic performance of shear links were obtained by parametric analysis.

关 键 词：可替换剪切连接件 拟静力试验 承载力 滞回性能 耗能能力 

分 类 号：TU391[建筑科学—结构工程] TU317.1