Study On The Performance-Based Seismic Structural Measure For Long-span Prestressed Concrete Continuous Beam Bridge Of High-speed Railway

In this paper, the typical long-span prestressed concrete continuous beam bridge of Chinese high-speed railway is taken as a research object to carry out study of the performance-based seismic structural measure by means of theoretical, numerical and experimental research. The main research work is as follows:(1) A design form of collapse-proof devices which can be used to long-span prestressed concrete continuous beam bridge of high-speed railway is studied based on the research of the present situation and existing deficiencies of seismic isolation technique and seismic structural measures of domestic and foreign bridges.(2) A 48+80+48m long-span prestressed concrete continuous beam bridge of high-speed railway is taken as an example, the finite element model of the bridge is built. Through the research on the earthquake response of the multi-earthquake, design-earthquake and rare-earthquake action, response spectrum analysis, linear and nonlinear time-history analysis are carried out to obtain the seismic response characteristics of this kind of representative bridge.(3) The design idea of cable-collapse-proof devices is proposed according to the structure characteristics of long-span prestressed concrete continuous beam bridge of high-speed railway. By carrying out a large number of nonlinear time-history analysis, the collapse-proof effect and the reasonable value of cable design parameters (cable stiffness, cable initial gap) of cable-collapse-proof devices are be researched. The general method and process of the design of cable-collapse-proof devices are put forward.(4) Through numerical simulation and full bridge shaking table test, to verify the rationality and effectiveness of collapse-proof design, getting the effect of seismic isolation and achieving the purpose of collapse-proof, Providing a reference for the seismic design structure of long-span prestressed concrete continuous beam bridge of high-speed railway in China.