Study On Seismic Performance Of Assembly Bridge Piers

With the development of technology and national economy, industrial production degree of commodity is getting higher and higher. The pursuit of short-term, high efficient and high quality have become new trend of development of bridge construction, at the same time, people for environmental requirements of the construction are also raised. In recent years, with the continuous developments of the bridge design technology and the emergence of new materials, bridge pier structure towards the direction of lightweight, high strength and rapid construction. At present, the upper structure of bridge in our country mostly can be prefabricated, there also has related specification and national standards, and the scale of production has been initially formed industrialization. But the substructure, such as bridge pier is at the preliminary stage of development, which application scope is very small. During the viaduct construction process in the city, because of the backward construction technology and long construction cycle, it has been causing traffic congestion and environmental pollution, this problem has become the major one that restricts the development of economy and society. Nowadays, in our country, lotsof city viaduct bridges have used prefabricated beams, substructure are still using the method of cast-in-situ, it is such large-scale site construction in the urban, brought about a series of problems to the city traffic and people’s life. Therefore, how to design the assembled bridge piers, how to determine the design index and how to evaluate assembled piers become particularly important, also be of more practical and social benefits.The annular section of externally pre-stressed segmental bridge piers are studied in this paper, which include the following four parts:(1) With the narrative of main test results and theory results obtained in the research at domestic and abroad, to understand the technology characteristics of segmental bridge piers, and the experience and problems obtained in theoretical and experimental study at domestic and abroad.(2) To establish the finite element model of annular segment assembled bridge piers in according to the experimental prototype by the finite element software ABAQUS, carry on the static analysis, and verify the consistency of the test results and model results. Then joining energy dissipating bars in the assembly pier, research its influence on seismic performance of assembled piers, and then analyzes the force under horizontal cyclic loading analysis, determinate the indicators such as stress and deflection conformed to the specification requirements or not.(3) According to the literature research to determine the parameters which affecting the seismic performance of assembled piers, analyzing the parameters of pre-stressed degree, energy dissipation ratio and pre-stressed reinforcement ratio. By changing one parameter with other parameters’ unchanged, to research each parameter, get horizontal load-displacement curve, energy dissipation, stiffness and viscous damping ratio curve under different parameters, analyze the effect of various parameters on the seismic performance of prefabricated bridge pier.(4) Through the research on seismic performance, get the rational parameters to meet seismic performance and the optimal economic of assembly bridge pier, and put forward the method to improve the seismic performance of the assembly bridge pier.Through the research on the assembled piers in this paper, it verify the rationality of the structure, proves the correctness of simulation of the finite element software ABAQUS, and get the reasonable parameters to achieve the optimal design which meet seismic performance and economy, to provide the reference for similar bridge design.