The Construction Simulation Of A Tensioned Membrane Structure In The Side Cable Slip Cases

Cable-membrane structure is a new large-span space structure. Different from the traditional rigid structure, the stiffness and reasonable shape of cable-membrane structure are mainly guaranteed through the reasonable prestress distribution inside the structure. The prestress distribution is affected significantly by the process of construction, so it is particularly important to track and control for the construction of a cable-membrane structure. In the actual process of construction, cable film slippage often leads to some differences with the prestress distribution from our expectations, thus making the membrane surface wrinkle, or even being destroyed. In order to accurately simulate the construction process of a cable-membrane space structure, one of the prerequisites is to deal effectively with the problem of sliding and friction between cable films.The MSM is especially suitable for solving problems in simulation of construction of the cable-membrane structure with "large rotation" and strong geometric nonlinear characteristics.Therefore in this paper, a new spring-mass model was introduced into the analysis of the tracking simulation of construction of the tensioned cable-membrane structure with consideration of cable film slippage, and the main work goes like this:1. A new mass-spring model was introduced into the analysis of construction simulation of the cable-membrane structure system, and a large deformation incremental algorithm that is suitable for cable-membrane structure was established based on the new spring-mass model.2. A numerical simulation method for calculation when the cable slips in the mid-support was put forward based on the spring-mass model, that is to simulate the process of cable slippage, by holding the co-node of the cable and the mid-support and changing the original length per unit of the sliding cable, so as to avoid the difficulty of redrawing the unit after the cable slips. Thereby an analysis method for film sliding iterative calculation in the construction of a cable-membrane structure was established.3. A method for analysis and calculation of the construction of a tensioned membrane structure was established based on the new spring-mass model, and a comparison was made upon the typical saddle-shaped cable-membrane structure when it took consideration of film slipping and when it not, so as to reveal the change in its spatial structure and stress state.4. Upon the completion of the analysis of the construction of a cable-membrane space structure, first of all, the analysis of the construction of a cable-membrane structure with construction errors of the boundary cable was initiated. Besides, a research is done, under consideration of cable slippage, about the influence of boundary cable errors upon the change of its spatial form and stress state. Then the influence of film slipping and different preset prestress upon the molded structure of the cable-membrane structure was also discussed.The outcome of this study specified the link between the design and construction, revealed the impact of cable-membrane slip and other construction errors, as well as different initial prestress, upon the stress state of a large span spatial structure. This will help to refine the design theory of cable-membrane space structures, and provide a theoretical approach for analysis and safety monitoring of the construction of a membrane structure.