Seismic Response Analysis Of Long-Span Six-Tower Cable-Stayed Bridges

It is well kown that the long-span bridge is one of the most important traffic life line projects, once destroyed, it will lead to huge economic lost, and heavily influence to the earthquake disaster relief work and repair of disaster areas damaged in an earthquake. Therefore the correct and effective design of earthquake resistance is of great importance to the safety of cable-stayed bridges.In this thesis, a long-span six-tower cable-stayed bridge—Jiashao Bridge is investigated, based on the basic theory of the seismic response analysis, making spectrum response analysis, time-history analysis and travelling wave effects analysis. The main contents in this thesis as follows:1. Based on the theory of finite element, a spatial finite element model of a long-span six-tower cable-stayed bridge is established, using the finite element analysis program ANSYS. The dynamic characteristics of three models are analyzed, including six-tower cable-stayed bridge with rigid hinge and piles, non-pile six-tower cable-stayed bridge with rigid hinge and six-tower cable-stayed bridge without rigid hinge and piles.2. The six-tower cable-stayed bridge model with rigid hinge are analized under two different boundary conditions:with or without piers, employing response spectrum method, to discuss the influnce of the interaction of pile-soil. The non-pile six-tower cable-stayed bridge model with or without rigid hinge are analized employing time history analysis method, to discuss the seismic response of rigid hinge. Through the above analysis, providing reference for seismic design and analysis of multi-tower cable-stayed bridge.3. The non-pile six-tower cable-stayed bridge model with rigid hinge under travelling wave is analyzed, using large mass method, to research the influnce of non-uniform excitation for long-span cable-stayed bridge.4. Rigid hinge is a key sectione to solve the temperature loading problem of the pylon of the multi-tower cable-stayed bridge, the safety and rationality of the rigid hinge structure is presented by analyzing the seismic capability of the six-tower cable-stayed bridge with rigid hinge.