| Due to its large span and reasonable force,the space structure is widely used in the construction field,especially in the industrial field.Due to the increasing span of the spatial structure,the dynamic load has a significant impact on the structural stability.Domestic and foreign scholars have carried out more research on the dynamic stability analysis under seismic loading,but the research on the field of structural damage caused by super unexpected wind load.Still very limited.In recent years,strong winds have caused structural damage accidents,causing major economic losses to China.According to the investigation of past accidents,the results show that the main cause of the damage is that the structure is subject to excessive wind pressure exceeding the design load value and the structural shape design exists.Irrationality,in which the large-span structure is a high-flexibility structure,and the wind-bearing area is large.For this reason,the collapse analysis of the large-span truss structure under strong wind is taken as the research goal,and the actual engineering case is taken as the research background,through the mathematical language.The random wind load is simulated and applied to the structure.Based on the structural dynamics principle and the structural collapse criterion,the collapse process of the grid structure is studied based on the structural displacement response and the plastic hinge failure result.Further,the reinforcement measures are proposed within a reasonable range.The specific research contents are as follows: :(1)Using MATLAB language to simulate random wind load,load it into the relevant node position of dry coal shed structure by formula,adjust the parameter to control the load wind load value,and realize the simulation of wind load on the random action process of structure.(2)Based on the BR criterion,the criteria for collapse of the truss structure are proposed.The finite element software is used to establish the dry coal shed structure model.The static response analysis is used to study the structural response under single load conditions to find the structural weak link and the most unfavorable load combination..Further dynamic time history analysis is carried out to obtain the displacement response results of the structure under different wind directions and the development of plastic hinges.Based on this,the critical wind speed of the collapse of the dry coal shed structure is judged.(3)It’s proposed to use the viscous damper to effectively strengthen the structural members,thereby improving the overall wind resistance of the structure.Several damper arrangements are set up,and the dynamic time history analysis is carried out respectively to compare the displacement response of the joint under different working conditions with the uncontrolled condition.At the same time,the energy consumption of the structure and the damper is obtained,and finally the optimal arrangement of the structural damper reinforcement measures is obtained.Program. |
