柱端设置L形连接件滑移摩擦节点单层钢框架抗震性能研究  

Seismic performance of single-story steel frames with L-shaped connectors slip friction joints at column ends

作　　者：李成玉[1,3] 马延港 陈焰周[2] 吴东平[1,3] LI Chengyu;MA Yangang;CHEN Yanzhou;WU Dongping(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Central-South Architectural Design Institute Co.,Ltd.,Wuhan 430071,China;Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan University of Science and Technology,Wuhan 430065,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]中南建筑设计院股份有限公司,湖北武汉430071 [3]武汉科技大学城市更新湖北省工程研究中心,湖北武汉430065

出　　处：《世界地震工程》2023年第3期56-67,共12页World Earthquake Engineering

基　　金：国家自然科学基金项目(51878522)。

摘　　要：基于损伤控制的理念,研究柱端设置L形连接件滑移摩擦节点(LCSFJ)钢框架的抗震性能和损伤情况。设计并制作了2个1/2缩尺的单层单跨梁贯通式钢框架试件,其中:一个为柱端设置LCSFJ钢框架试件;另一个为普通钢框架试件,对其进行拟静力加载试验。普通钢框架试验结束后柱脚屈曲严重,柱顶翼缘轻微屈曲。柱端设置LCSFJ的钢框架,在试验过程中,LCSFJ如期发生转动,进行摩擦耗能;试验结束后,LCSFJ连接件发生弯曲变形,黄铜摩擦片出现磨损,钢柱无明显损伤变形,利于震后修复;柱端设置LCSFJ钢框架滞回曲线饱满,表现出良好的抗震性能。试验结果表明:设置LCSFJ钢框架可以通过LCSF滑移摩擦和连接件屈服进行耗散地震能量,使梁柱等主体结构保持弹性。为提高柱端设置LCSFJ钢框架的抗震性能,建立有限元模型做进一步分析,配置隅撑的LCSFJ钢框架承载能力和耗能能力均有提升。有限元结果表明:配置隅撑可以在保证LCSFJ工作性能的前提下,显著提高柱端设置LCSFJ钢框架的承载能力和耗能能力,增强抗震性能。Based on the concept of damage control,the seismic performance and damage of steel frames with L-shaped connector slip friction joints(LCSFJ)at column ends were investigated.Two single-story and single-span beam-through frame specimens of 1/2 scale were designed and fabricated,one of which was a steel frame specimen with LCSFJ at column ends and the other was a normal steel frame specimen,which were subjected to quasi-static loading tests.At the end of test,the column bases buckled severely and the top flange of the column buckled slightly.For steel frame with LCSFJ at the ends of columns,during the test,the LCSFJ rotated as expected and carried out frictional energy dissipation.When test finished,connectors of the LCSFJ were bent and deformed and brass friction plates were worn,but columns had no obvious damage and deformation,which was convenient for post-earthquake repair.The hysteresis curve of steel frame with the LCSFJ was full and showed good seismic performance.The test results show that the LCSFJ steel frame can dissipate the seismic energy through the LCSF slip friction and the yield of the connectors,so that the main structures such as beams and columns can remain elastic.In order to improve the seismic performance of LCSFJ steel frame,a finite element model is established for further analysis.The bearing capacity and energy dissipation capacity of LCSFJ steel frame with corner braces are improved.Simulation results show that under the premise of ensuring the working performance of LCSFJ,corner bracing can significantly improve the bearing capacity,energy consumption capacity and seismic performance of steel frame with LCSFJ at column ends.

关 键 词：损伤控制 滑移摩擦耗能 L形连接件 梁贯通 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程]