Static And Dynamic Analysis Of Highway Continuous Rigid-framed Concrete Bridge And Discussion On Long Term Downwarping

The general development of continuous rigid-framed bridges at home and abroad were introduced in this thesis firstly,the structural and mechanical characteristics of such bridges were summarized,and several bridges with typical excessive deflections for a long time and the corresponding reasons were listed.For the prestressed concrete continuous rigid-framed bridge with span of(75+130+130)m,the parameters and construction scheme of the bridge were introduced in detail.The finite element software MIDAS/CIVIL was used to establish the finite element model of the whole bridge based on the beam element,the pile-soil interaction was simulated.The internal force,stress and deformation of the bridge in each construction stage were calculated.The bridge effects under dead load,vehicle load,general temperature change,temperature gradient and various load combinations are calculated and analyzed in detail.Pier-water interaction was simulated and the Lanczos vector iteration method was used to analyze the natural vibration characteristics of the completed bridge.The response of the structure to E1 earthquake and E2 earthquake was calculated based on the response spectrum method and time history analysis method,respectively.The general finite element software MIDAS/FEA was used to establish the detailed model of the zero block based on solid elements,and the complex stress of the zero block was calculated and analyzed in the maximum cantilever state and in the operational stage.Finally,the long term deformation of the bridge was calculated and analyzed based on the influences of concrete creep effect,prestress loss and live load overload.