某汽车4S店钢结构展厅加固设计案例分析

Case study on reinforcement design of steel structure exhibition hall in a 4S shop of an automobile

轻型钢结构屋面空旷,经常作为安装光伏板的第一选择。然而,屋面增加光伏板后,经常会遇到钢结构屋面承载力、变形不满足规范要求的情况,需要对原结构进行加固。针对某汽车4S店钢结构屋面增加光伏板进行了加固改造。主要措施为钢桁架平面外增加系杆以减小杆件的平面外计算长度,腹杆采取增大截面的方式提高承载力,下弦设置水平拉杆以减小竖向节点位移。加固后,在荷载基本组合作用下,上弦杆最大应力比为0.8<1.0,下弦杆最大应力比为0.74<1.0;在荷载标准组合作用下,跨中最大位移为40 mm<50 mm,桁架承载力和竖向位移均满足要求。

Light steel roof is empty,which is often used as the first choice for installing photovoltaic panels.However,after adding photovoltaic panels to the roof,the bearing capacity and deformation of steel roof often fail to meet the requirements of the code,and the original structure needs to be strengthened.In this paper,the steel roof of a 4S shop of an automobile was strengthened by adding photovoltaic panels.The main measures are adding tie bars out of the plane of steel truss to reduce the out-of-plane calculation length of members,increasing the cross section of web members to improve the bearing capacity,and setting horizontal tie bars in the lower chord to reduce the displacement of vertical nodes.After reinforcement,the maximum stress ratio of the upper chord is 0.8<1.0,and the maximum stress ratio of the lower chord is 0.74<1.0 under the basic combination of loads.Under the load standard combination,the maximum displacement in the span is 40 mm<50 mm,and the bearing capacity and vertical displacement of the truss meet the requirements.