The Dynamic Performance and Stability Analysis of Prestressed Arch-supported Net Shell Structures

摘要

Based on the structural features of net shell and prestressed arch structures, prestressed arch-supported net shell structures have been developed as a new large space structural system. Dynamical performances and stability of a real prestressed arch-supported net shell structure are analyzed in this paper by using ANSYS. The structure vibration frequency and natural conditions are extracted using dynamical modal analysis method. Because of the bigger ratio between the span and the thickness and smaller critical load values, significant stress advanced phenomenon of some truss bars will appear in the influence of construction when prestress cables are introduced to the space structures (especially for the combination of truss arch and net shell). These effects will make link nodes keep certain stress. Literature survey shows that the research on how the residual stress influences the stability of the structure is very still insufficient. Therefore, the overall stability analysis of the prestressed arch-supported net shell structure is very necessary. The result of research shows that the vibration frequency of prestressed arch-supported net shell structures is enhanced continually with the stronger overall stiffness. Vibration models are significantly different for diverse different structure forms. Result of this study also shows that the stress makes the buckling ultimate load of prestressed arch-supported net shell structure be improved markedly and the stability of prestressed arch-supported net shell structure be enhanced. As a result, the overall performance of this new hybrid structure system is better and it has a certain application prospect.