青洲斜拉桥的基准动力有限元模型

讨论了斜拉桥有限元动力分析模型,给出了基于环境振动试验结果建立大跨度斜拉桥基准有限元模型的步骤;讨论了桥面初始平衡构型、几何非线性、桥面板、混凝土桥面板与钢梁的剪力连接和端部纵向约束对模型的影响。经通车前现场环境振动试验结果验证的青洲闽江斜拉桥三维有限元模型,反映了桥梁在运营前的真实动力行为,可作为该桥各种复杂响应分析和长期健康监测、使用状态评估的基准。

Baseline dynamic finite element model of Qingzhou cable-stayed bridge

The current finite element models of cable-stayed bridges in structural dynamics are discussed.An ambient vibration measurement based procedure is presented to develop a baseline finite element model of the newly constructed Qingzhou cable-stayed bridge.Some important issues,such as the initial equilibrium configuration,geometrical nonlinearities,concrete slab,shear connection of the composite deck,and longitudinal restraints of the end expansion joints,have been clarified in the modeling of the bridge.The developed full three-dimensional finite element model is validated by the results of field ambient vibration tests.The model that reflects the bridge built-up structural conditions can be served as a baseline finite element model for the succeeding dynamic analysis,long-term health monitoring and service condition assessment of the target cable-stayed bridge.