Seismic Analysis Of Pre-tress Continuous Box-girder Curved Bridge

With the rapid development of transport network construction in China, bridge projects have been being constructed as the throat of city traffic, and especially the curved beam bridge have been being widely used cause of its flexible layout, beautiful appearance characteristics. Many times disastrous earthquake in the past confirms the significance of bridge project as an urban transportation lifeline constantly. Only to ensure that the bridge can still be used normally after the earthquake, the urban lifeline can keep its unhindered. Particularly the curved girder bridge with spatial characteristic is of great significance for its seismic analysis.Using finite element analysis software Midas/Civil for Seismic analysis of Pre-tress Continuous Box Girder Curved Bridge, relying on Xiaodongjiang pre-tress continuous box-girder curved bridge in Wuchuan City, Guangdong Province. Establish the finite element models of pre-stressed continuous curved box girder bridges with different radius of curvature,and carry out the following analysis:(1) Analyzing the self-vibration characteristics, vibration mode and coupling mode of pre-tress continuous box-girder curved bridge to study the law as its variation of the radius of curvature.(2)Analyzing the pre-tress continuous box-girder curved bridge under all of constant load,the longitudinal and transverse direction vibrate-load with seismic response spectrum for study its change of inter-force and search the effects of its inter-force under single load of three.(3)Choosing the Elcent wave after PGA adjusted as the input ground motion of the time history analysis to study the change of internal force of pre-tress continuous box-girder curved as alteration of radius of curvature under the interaction of three direction seismic wave. and search the effects of its inter-force under single direction seismic wave of three.(4)Establish a pile-soil-structure interaction finite element model to compare with the model of pier-consolidated under the function of seismic response spectrum base on Xiaodongjiang bridge sample. In order to study the different of vibration characteristics, internal force and displacement between two models.According to the seismic analysis result of normal continuous curved pre-stressed box-girder bridge, the law obtained have a certain reference value for similar pre-stressedconcrete continuous box-girder bridge and be helpful to the real bridge engineering.