The Analysis Of Collapse Of A Welded Hollow Ball Rack Workshop

Welding net structure is a kind of space grid structure. In recent years, as a mature system of large-span spatial structure is widely used in industrial and civil and other fields. But in the use of engineering, all kinds of collapse appear constantly, this had to cause people’s attention to the cause of the accident.Based on an actual overhaul shop welding net collapse for the topic background. Overall dimensions, weld quality, degree of corrosion and static performance of the collapse rack bar, steel ball and tube ball node has carried on the comprehensive test, And use the MIDAS finite element program and MST software network frame of the original design of the spatial grid structure, overall stability, deformation and seismic performance and other related question has carried on the analysis and summary, Mainly in the following work:1、At the scene of the accident collapse, partial collapse welding net was collected, Select a representative part of welding net was cut by the gas welding. Considering the collapse of the different reasons, cutting department is corroded seriously parts respectively, larger bent parts, rack bar stress bearing and serious destruction.2、For welding net from the field components are related tests. Overall dimensions, weld quality, degree of corrosion and static performance of the accident rack bar, steel ball and tube ball node was tested, through the measured data under normal use environment corrosion data. 3、The grid steel material test. The material of the test consists two parts of standard specimens and pipe. Standard test to select corrosion serious bar as the specimen of base metal, a tubular part according to the standard selection, at the same time the grid node by stress strain test.4、The collapse of welding ball rack failure analysis. According to the actual condition, were simulated and analyzed by using MIDAS finite element program and MST software overall stability, structure of the original design of space of the force, the deformation of the grid structure and seismic performance, combined with the site conditions and test data from the truss rod, ball and welding seam of three point of view, Analysis of the causes of failure of grid structure.Through the relevant research of collapse welding ball rack, I feel butt welding ball grid collapse the necessity of research and research status based on the safety status and steel structure corrosion current use of welding ball rack and puts forward some proposals.