Static And Dynamic Analyses Of Steel And Prestressed Concrete Composite Continuous Girder Bridge

In this thesis, the constitution, application and characteristics of steel and concrete composite girder bridge are reviewed firstly. Based on a55m+90m+55m spans steel and prestressed concrete composite continuous girder bridge, a dimensional finite element model of bridge is established by utilizing finite element analysis software MIDAS/CIVIL2012.The construction process of steel girder’s assembly, each segment of concrete deck and its inner prestressing are simulated. The static analyses of each procedure are carried out respectively. Besides, the single and combined effects of dead load, live load, system temperature and temperature gradient are investigated. As to the structural dynamics, free vibration characteristics, spectrum and time history seismic responses are analyzed. Also, the stability factors and their corresponding buckling modes are given in detail. Lastly, another construction method called prebended girder is put forward and discussed by some trail computations under different prebended forces for prestressing concrete deck.