City Interchange Seismic Response Analysis Of Continuous Box Girder Bridge

In the system of modern city's transport, city interchange continuous box girder bridge was used more and more. Once destroyed in the earthquake, it will bring in huge direct and indirect economic losses. Therefore, the research of mastering the reaction that the city interchange continuous box girder bridge in the region of high intensity earthquake is the scientific basis to establish a rational system and take effective measures for resisting earthquake.This paper use Bridge overpass in Xi'an whose structure is continuous box girder bridge for the engineering background and research the reaction that the city interchange continuous box girder bridge in the region of high intensity earthquake. The main contents are as follows.ridge interchange of typical continuous box girder bridge structure selected, five Spans the main line and three Spans the ramp, respectively, the finite element analysis and dynamic characteristics of the test load test,the results show that the dynamic stiffness of the bridge has a certain meet the design requirements, and there is a certain safety margin.Discusses the main changes in the bridge longitudinal dynamic characteristics and seismic response of its impact, the establishment of four different longitudinal models, the size of longitudinal (longitudinal discussed in the context(?)5%) on the bridge structure dynamic characteristics of large and the impact on the seismic response of large. Analysis of the curvature radius of the bridge ramp continuous curved beam bridge structure dynamic characteristics and seismic response, the establishment of six different radius of curvature of the model, the results show that the radius of curvature of the bridge structure dynamic characteristics and seismic response of large. The curve of the bridge response spectrum input direction of the problem, generally supported by two torsional center of the bridge connecting the vertical direction, the direction perpendicular to the transverse direction as the input response spectrum. In the design of earthquake intensity, using dynamic time history analysis method, calculation and analysis of the basic model the main line and the ramp bridge under seismic excitation in the one-way time-history analysis and response spectrum analysis and its results were analyzed, error of 20% in less, to meet the Highway bridge seismic design details. The basic model are calculated and analyzed the main line, in considering the vertical and 0.3 horizontal excitation, lateral and 0.3 longitudinal seismic wave excitation input, and check the results of seismic excitation compared.