低层冷弯薄壁型钢结构住宅体系抗震性能研究

Research on Seismic Behavior of Cold-formed Thin-walled Steel Framing System of Low-rise Residential Buildings

研究低层冷弯薄壁型钢结构住宅体系的抗震性能是进行该类结构体系推广应用的关键。本文基于ANSYS软件建立了低层冷弯薄壁型钢结构房屋体系骨架的有限元模型,考虑了冷弯薄壁型钢构件及楼板等构件。分别分析了该结构体系在考虑设防烈度为7度、8度多遇地震组合下结构的弹性时程反应,以及结构在设防烈度为7度、8度罕遇地震组合下的弹塑性时程反应。结果表明,考虑7度、8度多遇地震作用组合时,结构的弹性层间位移由风荷载起控制作用,而在罕遇地震作用下,结构弹塑性层间侧移则由地震作用控制。总体上,该类结构在7度、8度多遇及罕遇地震作用下其弹性及弹塑性层间侧移均可满足现行规范要求,该类结构体系具有良好的抗震性能。

It is key issue to study the seismic behavior of cold-formed thin-walled steel framing system of low-rise residential buildings for application of the structural system.The finite element method（FEM） is developed to simulate the performance of the cold-formed thin-walled steel framing system of low-rise residential buildings using ANSYS,and the cold-formed thin-walled steel members and slab are considered.Elastic dynamic time history analysis is performed under frequent earthquake based on the design earthquake intensity 7 and 8,respectively,and elastic-plastic dynamic time history analysis is performed under rare earthquake based on the design earthquake intensity 7 and 8,respectively.It is shown that the elastic story-drift of the structure is determined by the wind loads mainly under the loading combination with frequent earthquake action,and the elastic-plastic story-drift of the structure is determined by the earthquake action under the loading combination with rare earthquake action.The elastic and elastic-plastic story-drift of the structure satisfies with the limitation of the current design code in general.This type of structural system exhibits favorable seismic behavior.