The Simulation Analysis Of The Equivalent Load For High-piers And Long-span Concrete Bridges

As long span bridges are constantly emerging, the speed and load of vehicles are increasing, Coupled vibration of vehicle-bridge problems become more prominent. At present, home and abroad, establishing specific methods for load model can be divided into three methods:the measured statistics, theoretical analysis and experimental-theoretical combination. However, regardless of measured vehicle load spectrum, the random traffic which was obtained through the theoretical analysis, or by studying the frequency of the measured value of the traffic load spectrum, because the number of vehicles and vehicle restrictions, can not be directly applied to coupled vibration analysis well. Therefore, it is very necessary to find a Method to simulate reality generated by the bridge under vehicle loads, and to facilitate the calculation of Coupling Vibration Analysis.To be a part of the western traffic technology project'vehicle-bridge coupled vibration for high-piers and long-span concrete bridges', in this paper, by doing the typical one-week road investigation and analysis of traffic, modeling the measured vehicle load flow. To continuous beam bridge, continuous rigid frame bridge and rigid-continuous three kinds of span concrete bridges, based on finite element analysis software ANSYS, calculation model was established. Through the preparation of parametric design language APDL and its transient dynamic analysis capabilities were measured on the three bridges were under vehicle load flow analysis of the deformation. The typical day is divided into four periods, bridge deflection in 28 hours is given with the time schedule curve. Based on the principle that the deflections of observation section are equivalent. The equivalent load model is given for the most adverse load on the main beam deflection effects. The equivalent load model is given for the most adverse load on the main beam deflection effects.Paper based on FEM analysis software and the realization structure of equivalent deformation, realize the simulation of equivalent load. The results can provide a useful reference for coupled vibration of vehicle-bridge.