安庆铁路长江大桥基准动力有限元模型研究

Baseline dynamic finite element modeling of Anqing Railway Yangtze River Bridge

文章探讨了大跨度斜拉桥建模中的几个关键问题,即初始平衡构型、斜拉索垂度效应、恒载几何非线性和正交异性桥面板简化,为安庆铁路长江大桥的基准动力有限元模型的建立提供指导;介绍了该桥的现场环境振动试验以及峰值法和随机子空间法的模态参数识别结果。安庆铁路长江大桥有限元模型动力特性的计算结果与实测结果吻合很好,表明建立的有限元模型可作为该桥的基准动力有限元模型。

The modeling factors in finite element model of long-span cable-stayed bridge are studied, in- cluding the initial equilibrium configuration, cable sag, orthotropic deck simplification and geometrical nonlinearities, aiming at providing guidance for constructing a baseline finite element model of Anqing Railway Yangtze River Bridge. The field ambient vibration tests as well as modal identification of peak picking method and stochastic subspace identification method are presented. The excellent agreement between modal identification results and finite element model derived results is obtained, which dem- onstrates that the constructed finite element model can be the baseline dynamic finite element model of Anqing Railway Yangtze River Bridge.