The Simulation Analysis On Fatigue Problem And Dynamic Responses Of Flat-Panel Grid Structure With Bolt-Sphere Joints Under Suspenede Crane

There are many studies on the flat-panel grid structure with the bolt-sphere joints dynamic responses at home and abroad,but for the study of the flat-panel grid structure under the suspended crane fatigue simulation analysis is not yet mature enough.In fact, the crane load is different from the wind loads and seismic loads, which is composed of three stages, namely lifting stage, the operation stage and unloading stage.The various stages of the load have different characteristics.The fatigue problems of the grid are the the result of working together by the three stages's loads.The study of fatigue is important,therefore, the simulation fatigue analysis and dynamic responses on the flat-panel grid structure with the suspended crane is imperative.Based on ANSYS, this paper conducted the simulation modeling and a lot of analysis on the flat-panel grid, studied the dynamic response characteristics of grid structure under the crane loads,discussed part of factors of grid overall fatigue, verified the analysis results and rules of some fatigue problems,put forward some methods and views on fatigue analysis,and stressed this view that "about general grid under normal dynamic load, the fatigue problem is not the overall fatigue, but lowed by the overall grid reliability caused by fatigue damage of hanging point grid".