Optimum Design And Experiment Study On The Construction Totall Process Of Suspendome

Prestressed space steel structure is a kind of new structured style which is produced form the combination prestressed technology and space structure system. It was proved to be of good property of load carrying capacity. Suspend dome structure(SDS) is a new type of prestressed space steel structured style which has developed since the late 20 years. With the prestress acting on lower chord, the internal force and displacement produced by the upper reticulated shell is of opposite direction of loading, which strengthen the overall stability of structure. Compared with the cable dome system. SDS is of lower degree of prestress, furthermore, the upper reticulated shell itself is a statically indeterminate structure, with the rigidity exist in it, the cable prestress is much easier to be be exerted it.As the shortage of practical project of SDS and the lack of construction experience for it, it is necessary to do analysis of construction process and prestress optimization. In the dissertation, the writer summarizes the characteristics of SDS and the achievement which has been got around the world. In addition, it introduces the non-linear finite-element analysis and solution method which are used in the construction process of SDS. Taking the badminton gymnasium project of 2008 Olympics as an example, the writer carries out theoretical analysis and experimental research on the construction process of SDS.The construction forming analysis of SDS consists of shape-finding analysis and the process of cable stretching analysis. On basis of non-linear finite-element principle, for the structure, differentiating the initial state, geometrically zero state and loading state, it change process from geometrically zero state to initial state by adopting the method of tensile relaxation. The finite-element program-Anasys is used in emulating analysis of structural forming process. It analyses the member internal force, joint displacement and the prestressing variation of SDS among different cables with the increase of cable forces in the process of construction forming.By comparison of 4results of stretching schemes which indicate the member internal force and joint displacement, it analyzes the influence of different stretching sequence on structures. Finally, the writer adopt the strentching scheme which an much evener variation of internal force and lower joint displacement in upper chord member could be achieved. On the basis of it, considering the feasibility of construction, the scheme of lower prestressed stretching control value is adopted.Based on the theoretical analysis, this dissertation carries out the stretching test on the model to be analyzed, by the comparison of experiment results and theorerical calculated results, the feasibility of stretching scheme, the validity of theoretical analysis model and the accuracy of finite-element calculation are verified. The experimental analysis indicates that the internal force and deformation of SDS in the process of stretching are obviously different from that of applying phase, thus the most harmful force capacity during the process of stretching should be considered in the design.