论文部分内容阅读
考虑大跨度悬索桥结构的几何非线性因素,建立了风-列车-桥梁耦合系统动力分析模型。为了考虑结构大位移非线性因素的影响,在有限元建模时考虑悬索桥主缆自重垂度及缆索初始内力的作用,在动力平衡微分方程中增加了几何刚度矩阵,通过自编计算程序,研究了列车与风荷载同时作用下主跨1120 m的五峰山悬索桥设计方案的线性及非线性振动响应。计算结果表明,考虑结构的大位移非线性因素对桥梁位移及加速度时程曲线变化趋势的影响不大,但会使其响应极值减小,非线性因素对桥梁加速度产生的误差影响较大而对位移的误差影响较小。
Considering the geometric nonlinearity of the long-span suspension bridge, a dynamic analysis model of the wind-train-bridge coupling system is established. In order to consider the influence of nonlinear factors of large displacement of structure, the function of vertical self-weight of main cable and cable initial internal force of suspension bridge is considered in finite element modeling. The geometric stiffness matrix is added to dynamic equilibrium differential equation. By self-designed calculation program, Linear and Nonlinear Vibration Response of the Design Scheme of Wufengshan Suspension Bridge with 1120 m of Main Span under Train Simultaneous with Wind Load. The calculation results show that considering the large displacement nonlinearity of the structure has little effect on the displacement trend of the bridge and the trend of the acceleration time history curve, the extreme value of the response will decrease, and the nonlinear factor will greatly affect the error of the bridge acceleration The error of displacement is less affected.