Research and Application of Shape and Force Control in Steel Structure Hoisting Process
Combined with theoretical calculation and finite element analysis,the hoisting form,force state and stability control of super-long truss and super-large grid are discussed.The relationship between the internal force,deflection,end rotation angle and the hoisting point position of the super-long truss during single machine hoisting is calculated,and the corresponding optimal hoisting point position is proposed and verified by finite element analysis.The optimal hoisting point position of the super-long truss in the double machine hoisting is analyzed,and the setting range of the hoisting point when all the ropes are normally involved in the work is put forward.The out-of-plan stability problem of the super-long truss hoisting process is discussed.The stability curve when the hoisting point position and the rope inclination angle change is drawn,and the influence of multiple hoisting points on the out-of-plan stability is compared.The results show that the double machine hoisting does not increase the peak value of the stability curve compared with the single machine hoisting,but it can effectively increase the minimum value of the stability curve.The shape and force state control of the hoisting process for the super-large grid are analyzed,and the corresponding hoisting point positions when the internal force absolute value is the minimum,the deflection value is the minimum,and the end rotation angle is 0 are obtained respectively.By comparing the influence of the plan size of the grid,it is found that the length-width ratio of the grid only affects the lifting point position when the internal force absolute value is the minimum,but has no obvious influence on the lifting point position corresponding to the deflection absolute value is the minimum and the end rotation angle is 0.Combined with a practical project,the finite element model of the corresponding truss and grid structure is established to verify the accuracy and applicability of the analysis results.
steel structurestrussesgridshoiststheoretical calculationfinite element analysisstability
万方数据
维普
