Stress Optimum For Rigid Joint Of Arch Foot Of Rigid-Framed Tied Arch Bridge With Seagull Shape

Guangya Bridge locates at Liuzhou city, the main bridge is a half-through and rigid-framed tied arch bridge with a shape looks like a seagull. Its span layout is 63+210+210+63m and total length is 546m. Numerous rigid joints are applied to connect all kinds of members. The rigid joint locates between steel-box arch foot filled by concrete and arch abutment casted by concrete has very complicated structural and mechanical properties and its construction details are very difficult to be simulated in the finite element analysis of the whole bridge. It is necessary to carry out the local stress research for the rigid joint on the basis of the analysis of the whole bridge, and then find out the stress distribution rule and improve its detail design. The main work have been done as follows:(1) The feature of the beam-arch combination bridge is introduced and the research status of the rigid joint of tied arch bridge is summarized, and then the importance of stress distribution mechanism of the rigid joint of the rigid-framed tied arch bridge is maked clear.(2) The importance of the local analysis is discussed and the basic method of the local analysis is researched, and then the local model is intercepted and established and the boundary condition are also applied on the basis of the Saint-Venant's Principle.(3) The finite element model of local rigid joint of arch foot is accurately established to analysis stress results and explore the stress distribution mechanism of each member in local region, and then the advantage and the disadvantage of the local region are evaluated by the stress results.(4) The shortage of the detail design of the rigid joint of arch foot is pointed out by the calculation results, and then various construction measures are used to improve the local construction of the rigid point of arch foot. The results show that the stress distribution mechanism of rigid joint of arch foot improved by various measures is more reasonable than before.