某试验厂房屋顶垮塌分析研究

Analysis and research on the roof collapse of a experiment plant

某试验厂房在屋面保护层施工时突然垮塌。为判断推演现场情况,分析垮塌原因,核查、分析了设计图纸、施工质量、现场情况、设备施工安装等情况;检测了未垮塌部分钢屋架、屋面板、支撑、排架柱的制作、施工、安装质量;验算了钢屋架杆件截面受力情况。检测发现:造成事故的主要原因是屋面施工时荷载剧增,屋架个别杆件加工制作截面尺寸不足,屋面板支撑点未布置在屋架节点上;从而造成屋架杆件承载力不足,屋架发生屈曲、失稳,进而发生垮塌事故。最后,根据检测报告,制定了厂房结构重建实施方案,为相关工程提供参考。

A experiment plant suddenly collapsed during the construction of roof protection layer.In order to deduce the situation of the accident and analyze the cause of the collapse,the design drawings,construction quality,site conditions,and installation of equipment were checked and analyzed.The quality of manufacture,construction and installation of some steel roof truss,roof panels,braces and bent columns which was not collapsed was tested.The cross section force of steel roof truss has been calculated.The inspection founds that:the main causes of the accident are the sharp increase of load during the roof construction;the insufficient manufacturing section size of individual members of the roof truss;the roof panel support points are not arranged on the roof truss node.As a result,the bearing capacity of roof truss members is insufficient,the roof truss buckling,instability,and then collapse.Finally,according to the test report,the implementation plan of the plant structure reconstruction was made,which can provide reference for the related projects.