Research On The Some Key Problems Of Long Span P.C.Continuous Rigid Frame Bridge With High Pier And Thin Wall

With the development of technology and transportation enterprise, the continuous rigid frame bridges develop rapidly and grow towards long span and more flexibility. It makes the analysis of the stability, temperature and seism more important. So it is necessary to study the structural behavior of the continuous rigid frame bridge with long span and high piers.The text aim at the continuous rigid frame bridges, the theory of bridge's stabilization with long span and high pier and bridge's temperature effect is generally introduced, The theoretical formulation of temperature affect continuous rigid frame bridges is acquired by displacement method, it indicate that inner force produced by temperature relate with stiffness and length of pier and beam etc. Then study the thin wall and high pier stabilization combined with temperature, at the same time, take the Bei-shan Bridge as an example, use large general program, establish space finite element model to calculate and analyse temperature affect on stabilization, the result indicate that temperature affect on stabilization is little, and analyse the stress produced by temperature on the thin wall and high pier, it is indicate that the stress in pier's top and bottom is very large. And follow the theoretical calculation formulation of stability coefficient X of high pier, cantilever casting construction on the continuous rigid frame bridge is acquired by energy methods, and validated by large finite element program. And then analyse non-linear stability of high pier and long span continuous rigid frame bridge's cantilever casting construction and analyse the initial eccentricity and defect that may exist during construction of the continuous rigid frame bridges affect on stabilization, it is indicae that the non-linear is quite evidence on high pier and long span continuous rigid frame bridge, the initial eccentricity has little effect on linear stabilization and large on non-linear stabilization, the initial defect has little effect on linear stabilization. And last calculate and analyse dynamic characteristics of Beishan Bridge, and use dynamic response history analysis method calculate and analyse the influence of thin wall and high pier's response innerforce under seismic excitation with structure-earth effect and wave-passage effect be separately considered, the result indicate that should take into account structure-earth efifect and wave-passage effect when carry on seismic design of high pier and long span continuous rigid frame bridge.