Seismic Analysis And The Parameter Optimization Of Bridge Pier For Continuous Rigid Frame Bridge

In the recent years, with the fast development of transportation enterprise. Prestressed conerete continuous rigid frame bridge is commonly built in China, owning to that the integrity of the structure is better and the dosage of material is less, also the structure can able to adapt the displacement which caused by the prestress of reinforced, shrinkage and creep of concrete and the change of temperature. While the selection of design parameters is crucial in the design of the bridge, the rationality of the design parameters directly affect the self-respect and force performance of structure. Therefore, the research of the design parameters of continuous rigid frame bridge is of grate significance.Based on the engineering background of the bridge of South-to-North water diversion, this thesis focuses on the seismic response and the selection of design parameters of continuous rigid frame bridge with double thin-wall piers. The main work and conclusion is summarized as follows:Firstly, The text explores the research status of continuous rigid frame bridge with double thin-wall piers and the analysis method of bridge seismic response. Then, adopting the large-scale finite element software, the spatial calculation model of the bridge of South-to-North water diversion is established. And according to the theory of response spectrum and the theory of dynamic time-history analysis, the thesis make the checking computations to this bridge of aseismatic performance. This text makes the elasticity seismic analysis and un-elasticity seismic analysis of this bridge on the basis of new code, and show that under the seismic response the bridge of South-to-North water diversion could able to meet the requirements of code.Then, research on the rationality of rigidity the piers of prestressed conerete continuous rigid frame bridge, combined with the engineering practice. Established10different modes with different thickness of single thin-wall piers, and on the basis of model calculating, compared the results about internal force and deformation under the still load and motive power, as well as the stability of bridge. It is also to the spacing of double thin-wall piers. Though the analysis above, the design parameters of the double thin-wall Piers has been optimized, in order to optimize the conformation of this bridge.Finally, according to the influencing factor of parameter of double thin-wall piers, compared the results about internal force of piers with different parameters, which is the different main spans, the different height of piers, different thickness of single thin-wall piers and the different spacing of double thin-wall piers. Though the analysis above, and according to the analysis datas and the datas of bridge which has already built, this text get the formula of reasonable design parameters of double thin-wall piers, by using the theory of Multiple linear regression analysis. So as to a reference for engineering.The work carried out in this paper not only optimize the conformation of the bridge of South-to-North water diversion, but also provides a reference design for the bridge parameters.