The Research On The Analysis Method For The Structure Of Multi-Span High-Rise Construction Machinery

This subject comes from National Key Technology R&D Program in the 11th Five year Plan of china, which called the research and industrialization development of the high-rise constructron lift. The Project Number is 2006BAJ12B04-03. In construction of project, towering construction equipment is becoming more and more widely applied. The research on this structure is very meaningful. Until now, it hadn't yet to suggest the design of the stiffness of attachment device in related references both at home and abroad. At the same time it hadn't obtained the calculation formula of the lateral displacement and maximum adhesion. There hadn't put forward a reliable reference to the stiffness of attached device effecting on torsion deformation, the overall structure of the lateral displacement and maximum adhesion. This paper tries to build a reasonable model, combined with Second-order precise finite element theory and differential equation related knowledge to research the above questions, which tries to put forward a reliably industry for reference.According to the characteristics of span continuous beam structure of model and the second-precise finite element theory, it conducts ban equivalent to the bottom structure. Processing block tridiagonal matrix and draw bottom equivalent stiffness, calculating tall structures reasonable position and Reasonable overhanging length relative to the size of the biggest independent height. According to the requirements of the stability on multi-span flexible support structure that balance stiffness matrix determinant equal to zero, it calculated the stiffness of support which meet the engineering practical requirements and drew the range of common attachment structure.On the analysis of elastic supporting cantilever beam, elastic support for beam functions as vertical elastic supporting and torsional elastic supporting constraint function. This paper studied the second-order effect and axial force on the project when elastic supporting cantilevers nonlinear deformation calculation method.On the base of calculating the equivalent torsional rigidity of multi-span flexible support structure, It use the method of successive included in the bearing deflection and the differential equation of bending beam derived general nonlinear deformation calculation. Based on this, the supporting counterforce of elastic supporting equals the product of Stiffness and deflection. By calculation formula, it discussed the lateral displacement influencing factors and analyzed the stiffness of cantilever end deflection and each fulcrum reverse force and displacement influence. It also discussesed the support distance and supporting number's influence on reverse force and Cantilever end deflection. Through comparing, it drew the conclusion that it is necessary to considering elastic supporting.