Research And Simulation Of Integral Lifting Technology Of Single Layer Latticed Shell

In large-scale buildings,with the wide application of reticulated shell structure in large area,steel structure installation has become the key field of common discussion and research in the industry,and the construction methods suitable for different structure installation are born.Among them,the emergence of computer automatic integrated control hydraulic integral lifting technology fills in the blank of overall lifting technology and solves the construction problems of space steel structure lifting,which has important engineering practice significance in the construction field of large steel structure.In this paper,the whole lifting and installation of single-layer welded spherical reticulated shell structure roof of a memorial hall is simulated and analyzed,which is used to guide the construction technology design and solve the key technical problems of integral lifting.The roof of the memorial hall is a single-layer welded spherical reticulated shell structure with multi-point support.The structural plane is circular with a radius of 22.0m.There are 28 supports in total.The maximum rise height of the reticulated shell structure is 6m and the maximum installation elevation is 24.25 m.The reticulated shell structure is a single-layer structure,the number of nodes in the structure is large,and some members can not be lifted as a whole.Therefore,it is difficult to set the lifting points during the integral lifting,and the structural deformation should be considered at the same time.The software analysis method is used to model the lifting process one by one with SAP2000 finite element analysis software,and the combination of self weight and wind load during construction is considered.The results show that the minimum safety factor of the critical load is 1.27(greater than 1),which meets the requirements of the specification;six lifting points are set and the overall stress ratio of the shell is 0.3-0.6 to meet the lifting safety requirements;the maximum deformation of30 mm is calculated in the middle of the span,and the maximum deformation is 1 / 1266 of the span,which is far less than the specification The results show that the maximum lifting force of the latticed shell in the two stages of opening and filling the gap should be selected as the basis for the selection of lifting equipment.Combined with the weight of the lifting unit,the hydraulic lifter and steel strand specifications are selected.Through simulation analysis,it is known that the stress ratio of each member meets the requirements in these two stages On this basis,it guides the design and installation of lifting platform,lower lifting point and embedded parts.To sum up,this paper uses the finite element software to simulate the key position of each lifting stage,calculates the internal force and displacement,reasonably arranges the lifting points,and provides the basis for the design of the overall lifting support system,flexible sling and horizontal tension.