风荷载下轻质木框架房屋结构的有限元分析

Finite element analysis of light wood frame structure under wind load

轻质木框架房屋墙体主要承受竖向荷载以及地震或风作用下的水平荷载.作者利用ANSYS软件对风荷载作用下轻质木框架房屋进行有限元模拟,通过模拟分析剪力墙体中水平剪应力分布状况,发现在风荷载直接作用下与风荷载方向平行的墙体(纵墙)起到主要抗剪作用,与风荷载方向垂直的墙体(横墙)所起的抗剪作用较小;如果墙体中存在洞口,则洞口上方墙体可以承担和传递剪力;如果房屋结构重心与平面形心不重合,则风荷载作用下房屋结构体系会产生扭转,扭转产生的附加剪应力使得部分墙体中剪应力增大.

The wall of light wood frame building mainly bear vertical load and horizontal load caused by earthquake or wind. In this paper, ANSYS, a finite element software, is used to simulated the light wood structure building under wind. The horizontal shear stress distribution situation of shear wall is analyzed through simulation results. The wall parallel to wind load direction （longitudinal wall） plays a major role in shearing under wind load. The wall vertical to wind load direction （transverse shear wall） plays a slight role in shearing under wind load. If there is a hole in the wall, the wall above the hole can bear and transfer shear forces. The building is twisted under wind load if the building structure focus is not consistent with the plane centroid, and the additional shear stress caused by torsion makes parts of building walls shear stress increase.