Nonlinear Seismic Analysis Of Passenger Dedicated RailwayBridge

Passenger dedicated railway bridge structures are very complex, and dimensions of piers are much more larger than other common railway bridges.So their lateral and longitudinal rigidity is more bigger.The whole construction costs are also increared much more.It is very important to guarantee seismic safety of such structures because of the particularity and importance of them. At the same time,the ductile seismic design is needed by passenger dedicated railway bridges in earthquake zones.Nonlinear time history analysis method suggested by seismic code is complex for engineers . Push-over analytical method is regarded as a new seismic evaluation method and also as a simplified one. This method is an efficient tool in performance-based design method which pushes structures with some kind of load patterns until target displacement is reached.This method can evaluate the structural performance under earthquake events. Push-over analysis can get more information than static elastic analysis, and it is easy to operate in most cases. Seismic performance of Xinkaihe River extra major bridge on Beijing-Tianjin intercity rail transit is evaluated using nonlinear time history analysis method and push-over method. The results obtained by two methods are compared in detail.The basic principles and concepts of the push-over analysis method and nonlinear time-history are systemically discussed. Two time-history analysis calculate methods and the distributing patterns of lateral loads are studied, and several push-over methods are compared.The capacity spectrum method is emphasized. Finally, according to the true bridge Xinkaihe River extra major bridge is used to demonstrate the rationality of the push-over analytical method on passenger dedicated railway bridges by comparing with nonlinear time-history analysis method. We also analysis the seismic performance of the passenger dedicated railway bridge.It can be concluded that push-over analytical method is a reasonable method for seismic evaluation of passenger dedicated railway bridges. There are 69 diagrams, 12 tables and 60 references in this paper.