冷弯薄壁型钢房屋骨架拟动力试验研究  

Pseudo Dynamic Test on a Cold-Formed Thin-Walled Steel Housing Structure

作　　者：孙海粟[1] 邢永辉 王新武[1] 陈易飞 布欣[1] SUN Haisu;XING Yonghui;WANG Xinwu;CHEN Yifei;BU Xin(College of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]洛阳理工学院土木工程学院,河南洛阳471023 [2]重庆大学土木工程学院,重庆400045 [3]北京工业大学建筑工程学院,北京100124

出　　处：《工业建筑》2023年第8期65-73,共9页Industrial Construction

基　　金：国家自然科学基金项目(51678284);河南省科技创新杰出人才项目(184200510016)。

摘　　要：为了研究冷弯薄壁型钢房屋结构在地震下的整体响应及破坏模式,对一栋高3 m的足尺模型进行不同地震波下的拟动力试验,分析地震作用下房屋的位移响应、滞回性能、刚度退化和墙体骨架破坏模式等,且引入了对骨架破坏程度评估方法,为冷弯型钢房屋破坏程度评估提供了参考。研究表明:加载方向平面内墙体节点破坏模式多为弯扭破坏,且斜撑布置方式对结构内力分布具有较大影响,设计时应给予考虑;房屋加载方向平面内各墙体中间一排节点与门窗洞口处为最薄弱位置,建议利用加固件提升节点开孔处横杆翼缘的整体性或者改变斜撑布置形式等方法提高节点的承载能力;在El Centro波和Northridge波作用下,按照现行GB 50011—2010《建筑抗震设计规范》给出的最大层间位移角参考控制值对结构竖向构件破坏状态的划分方法同样适用于冷弯薄壁型钢结构体系;结构在各地震波作用下,最大层间位移角未超过GB 50011—2010规定的限值,满足“小震不坏,中震可修,大震不倒”的设计目标。In order to study the overall response and damage form of a cold-formed thin-walled steel housing structure under earthquake,the pseudo-dynamic test was carried out on a full-scale model with a height of 3m,analyzing the displacement response,hysteretic performance,stiffness degradation and the failure form of wall skeleton under earthquake action,and the evaluation method of the damage degree of the skeleton was introduced,which could provide a reference for the evaluation of the damage degree of the cold-formed steel buildings.The research showed that the failure mode of joints of in-plane wall parallel to the loading direction were mostly bending and torsion failure,and the arrangement mode of diagonal braces had a great influence on the distribution of internal forces of the structure,which should be considered in the design.The middle row of joints in the walls parallel to the loading direction and the entrance of doors and windows were the most vulnerable positions of the structure,and it was suggested to improve the bearing capacity of the joint by adding the reinforcer to improve the integrity of the flange of the transverse bar at the opening of joint or changing the arrangement of diagonal braces.Under the El Centro wave and Northridge wave,the failure state of the vertical members of the structure was divided according to the reference control value of the maximum inter-storey displacement angle given in the current Code for Seismic Design of Buildings(GB 50011—2010),which could be also applicable to the cold-formed thin-walled steel structure system.The maximum inter-storey displacement angle of the structure under the action of each seismic wave did not exceed the limit value specified in the code,meeting the design goal of“small earthquake is not bad,middle earthquake can repair,big earthquake does not fall”.

关 键 词：冷弯薄壁型钢 拟动力 破坏模式 抗震性能 开洞墙体 

分 类 号：TU392.1[建筑科学—结构工程]