Cooperative Analysis Theory And Wind-Induced Vibration Of Cable-Strut-Membrane Space Structures

Cable-strut-membrane space structures (CSMSS) is a new style of space structures which composed of cable, strut and membrane elements, and the structures are geometrical stable and stiffened only under prestress. Because of its novel shape, ingenious idea and efficiencies, it is widely used in practical projects. However, for membrane structures and cable-strut structures are always analyzed separately, the cooperative studies on cable-strut-membrane space structures are rare. Some research work on the theory and experiment of CSMSS is carried out in this thesis.Firstly based on reading many literatures, the development history and present situation of CSMSS is introduced and an explicit definition of CSMSS is defined.The nonlinear finite element method equations are presented in detail, considering the orthotropic material property of the membrane and the wrinkled or relax properties of elements. Based on the equilibrium equation, the states of self-stress and the modes of inextensional mechanisms are solved by the singular value decomposition method. And the equilibrium equation can be solved by the generalized inverse method. The force density method is proposed. The analysis programs of these methods are developed.The force density method and the nonlinear finite element method are used together to do form-finding analysis of the membrane structures. The SVD method is used to solve the prestress in the cable-strut structures. The equilibrium on current state method and the fictitious-true structures coupling method are established to cooperatively analyze the CSMSS. The examples prove the theory presented is correct. Compared with the cooperative analysis, the non-cooperative analysis leads to the defect result about the geometry shape and the prestress. The distinction between the cooperative analysis and the non-cooperative analysis is presented.The cooperative analysis is studied on the static load problem and the wrinkled or relax properties are described. By the comparison between the cooperative analysis and the non-cooperative analysis, it can be concluded that the soft roof will reduce the structure stiffwhile the stiff roof can stiffen the structure, so the non-cooperative analysis about the CSMSS will make the structural design unsafe.A model experiment is carried out. The contents are design, construction process, and the static loading test which is compared with the result from the theory. Another project is achieved in Hangzhou. The theory and the programs are verified and the construction process is studied during these projects.Two methods are discussed in the research of the wind-induced vibration. One is non-linear random finite element method in time domain. Based on the linear filter technology of random process, artificial wind speed processes are generated with the autogressive-type simulation method, which consider time and spatial correlativity. Then the time history record of fluctuating wind pressures are obtained considering the velocities coupling and the added air mass. The example shows the strong non-linear property of the CSMSS and the non-cooperative method is unsafe. The parameter analysis is done and the structural response factor is provided. Another method is the fluid-structure interaction emulation using the computational fluid dynamics (CFD) and the computational structure dynamics (CSD). The wind movement and the wind pressures are obtained by CFD. By compared with the norm, the result from CFD is proved correct. The fluid-structure interaction emulation analysis shows the large displacement of the structure will affect the fluid movement and the wind pressures.At the end of the thesis some conclusions are summarized and the problems that should be studied further are put forward.