The Static And Dynamic Analysis Of Traffic Bridge On The Shimen Reservoir Dam

Bridge is a kind of critical joint,which connects the transportation and water conservancy construction across the river,valley,or other obstacles.It can be extended to ensure transport system smooth,and it's carrying and traffic capacity is the key point through the line.Currently,there are many studies on bridges.However,little investigation was conducted on the bridge traffic of dam crest.With the development of the economy,there are more and more shapes and types of bridges,some dams cannot be avoided by using a new type of bridge in design.Therefore,it is of great significance to understand and master the new bridge.The bridge on Shimen reservoir dam is a large tied arch bridge,which is a typical new bridge on the crest.In this paper,the static and dynamic analysis of the Shimen reservoir crest bridge is carried out by ABAQUS.The main contents are as follows:(1)The whole finite element model of bridge and spillway dam is established.The structure is modeled according to the content of the design data.The beam and rod elements are used in the bridge modeling,and the solid element is used in the overflow dam and the pier.In this paper,a unified theory is applied to study the arch rib of composite structure in bridge structure.The hanger prestress in bridge structure is loaded by cooling method.(2)Static design evaluation of bridge.The stress state of bridges under different static conditions is simulated,the deformation and stress of the bridge are calculated respectively,and compared with the specifications.(3)The structure vibration mode and natural frequency are analyzed.The finite element modal analysis method is used to calculate the natural frequencies and structural modes of the structures.It is found that the natural frequencies of the bridge and the spillway are quite different,and the resonance phenomenon will not occur.(4)Dynamic design evaluation of bridge.In this paper,the time history analysis method is used to analyze the seismic action of the structure.The two conditions of the bridge are located at the top of the dam and on the ground respectively.It is found that the existence of the spillway increases the vibration of the bridge Z and the vibration attenuation of the bridge is slow,but the bridge dynamic design is reasonable and safe in the reasonable range.