基于损伤的多层冷弯薄壁型钢结构房屋抗震性能及设计方法  

Research on Seismic Performance and Design Method of Cold-Formed Thin-Walled Steel Buildings Based on Damage

作　　者：褚云朋[1] 钟燕 罗萍[1] CHU Yunpeng;ZHONG Yan;LUO Ping(Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学,四川绵阳621010

出　　处：《工业建筑》2022年第4期50-55,90,共7页Industrial Construction

基　　金：国家自然科学基金项目(51278236);四川省工程材料与结构冲击振动实验室项目(19kfgk09);四川省科技厅基础研究项目(2019YJ0322)。

摘　　要：低层冷弯薄壁型钢结构房屋抗震性能良好,但当结构体系由低层转向多层房屋时,其抗震性能不明确。此外,地震作用随着建筑高度的增加而增大,因此需要有明确抗震设计方法以保证多层冷弯薄壁型钢结构安全。结合开展的双层组合墙体及组合墙体-楼板节点试验,借助已有足尺房屋振动台试验结果,确定结构表征损伤参数,建立损伤判定准则。并且,采用等代拉杆法建立结构简化力学分析模型,通过SAP 2000对4~6层结构进行抗震性能分析,得到其在不同罕遇地震作用下结构损伤指数、层间位移角等。之后,借助损伤判定准则,依据“三水准”抗震设防要求,调整恢复力骨架曲线特征值,完成结构抗震设计。主要结论为:1)7度及8度罕遇地震作用下结构发生“中等破坏”,顶层位移角满足限值;9度罕遇地震作用下,层间位移角超过“严重破坏”限值,须进行层间加强,以满足“大震不倒”的设防要求。2)通过增设桁架加强部件能提高结构抗震能力,满足结构抗震设防要求。The seismic performance of low-rise cold-formed thin-walled steel buildings is good,it is not clear when the structural system changes from low-rise building to multi-story building.In addition,the seismic action increased with the increase of building height.Thus,to ensure the safety of multi-story cold-formed thin-walled steel structures,a definite seismic design method is necessary.In the paper,the damage structural parameters were determined and the damage criterion was established based on the results of existing shaking table tests of full-scale buildings,combined with tests of the double-layer composite wall and the joint of composite wall and floor.Furthermore,the simplified mechanical analysis model of the structure was established by using the equivalent rod method.The SAP 2000 was adopted to analyze the seismic performance of 4-6 stories structure,and the damage indexes and displacement angles of the structure under different rare earthquakes were obtained.Then,according to the damage criterion and the requirements of“three-level”seismic fortification,the seismic design of the structure was completed by adjusting the characteristic values of the restoring force skeleton curves.The main results were shown that:1)under the action of 7 degree or 8 degree rare earthquakes,the structure appeared“medium damage”and the top displacement angle satisfied the limit value.Under the action of 9 degree rare earthquake,the interlayer displacement angle exceeded the limit value of“serious damage”.Therefore,the interlayer strengthening was required to satisfy the requirements of“large earthquake no collapse”under large earthquake.2)The seismic capacity of the structure could be improved by adding truss strengthening components to meet the seismic fortification requirements of the structure.

关 键 词：损伤状态 结构简化力学分析模型 地震作用 抗震性能 设计方法 

分 类 号：TU352.11[建筑科学—结构工程] TU392.1