基于Midas的悬臂钢桁梁有限元分析及螺栓刚度识别

Finite Element Analysis to a Cantilever Steel Truss Girder and Study on Bolt Connection Stiffness Recognition Based on Midas

采用Midas Civil有限元软件中螺栓连接的建模方法,对螺栓连接的钢桁梁桥悬臂拼装施工状态进行有限元模拟,并将实测结构静力位移和有限元建模试算进行对比,对螺栓连接刚度进行识别。结果表明:将螺栓完全采用刚性连接模拟是不合理的,应采用一般弹性连接进行模拟。通过有限元建模试算,间接识别得到的螺栓连接刚度取值是合理的,位移预测误差为1.5%,获得了钢桁梁悬臂拼装施工状态较准确的有限元基准模型。

In order to simulate the cantilever construction state of steel truss girder that is connected by bolts is studied by using finite element method（ FEM）. The finite element software Midas Civil is applied. By comparing the measured results of static displacement and the results by FEM calculation, the bolted connection stiffness is identified successfully. The results demonstrate that the simulation by rigid connection of bolt is completely unreasonable,and it should be simulated by using the general elastic connection. The selection of the bolted connection stiffness identified by FEM pilot calculation is reasonable. The prediction error of static displacements is only 1. 5%. It obtains the more accurate finite element benchmark model for the steel truss girder.