Research On Seismic Response Of Long Span Hybrid Beam Cable-Stayed Bridges

In this thesis, a long-span hybrid beam cable-stayed bridge——Edong Changjiang river highway bridge is investigated, basing on the basic theory of the seismic response analysis and making use of finite element analysis program ANSYS, maked spectrum response analysis, time-history analysis and travelling wave effects analysis adopting this two method. 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 hybrid beam cable-stayed bridge is established, using the finite element analysis program ANSYS. The dynamic characteristics of two models are analyzed, including hybrid beam cable-stayed bridge with piles and non-pile hybrid cable-stayed bridge.2. The hybrid beam cable-stayed bridge model are analized by the finite element analysis program ANSYS under two different boundary conditions:with or without piers, adopting standard spectrum in pecification and employing response spectrum method, to discuss the influnce of the interaction of pile-soil.3. The hybrid beam cable-stayed bridge model are analized under two different boundary conditions:with or without piers, adopting synthetic seismic waves and employing time history analysis method, to discuss the influnce of the interaction of pile-soil and compare the result analized by response spectrum method and time history analysis method.4. The non-pile hybrid beam cable-stayed bridge model under travelling wave effects is analyzed, using large mass method, to research the influnce of non-uniform excitation for long-span hybrid beam cable-stayed bridge. Through the above analysis, providing reference for seismic design and analysis of hybrid beam cable-stayed bridge.5. Based on the Edong bridge, four finite element models with different positions of Steel-concrete combination section is established referencing on its design values,to anslysis the changes of different model's dynamic behavior and seismic response influenced by the position of its steel-concrete combination section,and providing reference on the selection of steel-concrete combination section's position in the same type bridges.