Simulation Analysis of Single-layer Aluminum Alloy Spherical Shell Jacking Construction Process
Single-layer reticulated shell structure is a popular structure for large-span aluminum alloy building roof.However,there are few researches on single-layer aluminum alloy spherical shell jacking.In this paper,combining with the project construction process and simulation analysis,the single-layer spherical latticed shell structure constructed by monolithic jacking method with four jacking schemes.Through the comparative analysis of the forctors such as net shell deflection,rod stress,jacking point support reaction force and displacement under the working condition of four jacking schemes,a 12-point jacking scheme of a single circle was initially selected.By analysing four reticulated shell jacking structures based on the ratio between the diameter of the projection circle in the horizontal plane and the diameter of the circle where the reticulated shell support is located(Dd/D0),it is concluded that jacking schemeis the bestone atDd/D0=3/5.The simulation analysis results of the jacking bracket using MIDAS show that the compressive ultimate bearing capacity is 478kN,which is 5.7 times of the maximum support reaction force at the jacking point,and can meet the jacking requirements.Through the simulation analysis of support conversion,it is proposed that the jacking height exceeds the design elevation by 0.200m,and temporary measures such as increasing bull legs,limit plates and rollers can meet the requirements of support conversion and mesh shell shape finding.By carrying out the analysis of the influence of temperature on the structure and rods of the mesh shell,the reasonableness of adopting the annual weighted average temperature as the reference temperature is verified.
万方数据
维普
