Investigation Of Seismic Responson Of High Piers And Long Span Continuous Rigid Frame Bridges

In recent years, the destructive earthquakes in the world are frequently occurred, and the damage and the secondary damage of the earthquake caused a catastrophic loss. to the human life and property of people. At the same time, it has brought a profound revelation to people, and it has made a new thinking for the seismic design of the bridge. The bridge seismic response analysis has become the focus of the bridge design. With the rapid development of China’s economic construction and transportation, high pier long-span continuous rigid frame bridge because of its beautiful appearance, light weight, material saving, both beam bridge and arch bridge characteristics when acrossing the deep gully has been more and more widely used. The research of seismic response of high pier and long-span continuous rigid frame bridge has very important significance. In this paper, a high pier and long span continuous rigid frame bridge is studied, and the bridge seismic principle and seismic method are discussed. The seismic performance of the bridge is analyzed by using the response spectrum and time history analysis method for the E1 and E2 two level earthquake. The basic characteristics and laws of the seismic response of high pier and long-span continuous rigid frame bridge are obtained. The main research work of this paper is as follows:1. In the first chapter, the significance and background of this study are discussed, and the main design contents and design principles of seismic design of bridge damage and bridge are summarized. This paper introduces the present situation of the domestic and international research on the key problem of bridge seismic resistance and the design method of the use of it, and puts forward the main research contents and the research direction of this paper.2. The second chapter mainly introduces the basic analysis method of bridge seismic response, including static method, elastic plastic analysis, response spectrum analysis, linear time history analysis and nonlinear time history analysis.3. In the third chapter, the basic principle and method of the finite element analysis of bridge dynamic characteristics are summarized, and the engineering example of a high pier and large span continuous rigid frame bridge is established.4 The fourth chapter on the established finite element model of engineering examples, the earthquake response spectrum and response spectrum corresponding to the artificial time histories of wave, the response spectrum and linear time history seismic response analysis methods of bridges in seismic response analysis, high pier long-span continuous rigid frame bridge with typical seismic response characteristics. The seismic response results and the seismic code values are compared and calculated, and the structure is safe and reliable. By means of the peak amplitude modulation method of ground motion, the plastic hinge characteristics and the law of plastic hinge of plastic hinge are studied by means of cross section fiber hinge.5 In the fifth chapter, according to the theory summary and the high pier and long span continuous rigid frame bridge project, this paper puts forward some conclusions, and puts forward the corresponding suggestions, in order to provide theoretical support and calculation basis for the seismic response analysis and structural safety design of high pier and long span continuous rigid frame bridge.