Spatial Dynamic Behavior Of Long-span Steel Truss Girder Suspension Bridge Under Two-way Multi-lane Stochastic Traffic Flow

Suspension bridge is a strong competitor in long-span bridges and super long-span bridges, because of its explicit force, beautiful structure mode and great spanning capacity. After Taco Ma damaged by wind, the stiffening girder plate bridge exited the stage of history, which makes the structure of steel truss bridge continuous development. In this paper, sidu river bridge in Hubei is taken as the background, circling round the analysis of dynamic characteristics of long-span suspension bridge. On the basis of existing research, the paper carries out some meaningful research.Firstly, summarize the international development of suspension bridges and then,generalize calculation and analysis theory and dynamic characteristics of suspension bridges to provide a static and dynamic analysis for the suspension bridges.Secondly, the paper introduces the static and dynamic load tests of sidu river bridge. It uses large general-purpose software ANSYS finite element model for calculation of static conditions in the response and its vibration characteristics, and then compares theoretical analysis results with the measured results to verify the accuracy of the finite element model. It lays a good foundation for static and dynamic model updating based on a bridge benchmark finite element model.Thirdly, elaborated optimization algorithm based on ANSYS finite element model updating. Based on the frequency set of objective function, and other static and dynamic information as a constraint Correction Method and implementation of model updating of a suspension bridge. On this basis, the preparation of static and dynamic load testing of bridge analysis software BDANS, the revised model as a bridge to cross the river four ANSYS input file into BDANS, the combination of static and dynamic tests of the measured data to verify the accuracy of the BDANS. At the same time based on OpenGL technology developed BDANS visualization and animation capabilities, to achieve the bridge system in the calculation of the dynamic visualization.Fourthly, choosing different values of the expansion joint stiffness beam longitudinal stiffness of the joints span steel truss bridge static and dynamic characteristics; comparison of different forms of the central buckle under the suspension bridge and driving the vibration characteristics of the dynamic state features can improve the central buckle obtained the overall stiffness of suspension bridges, limiting the vertical displacement of beam end and to avoid injury vertical boom useful conclusions; on bridge health monitoring data obtained from the investigation and analysis of traffic statistics, extraction time of two typical random traffic, effects of different suspension bridges under random traffic flow dynamic response, obtained under intensive operations than dynamic response of bridge response under normal operating state values; and bridges in the state of intensive operations such as the amplitude of the larger beneficial conclusion.