Nonlinear aerostatic stability analysis of suspension bridges
Nonlinear aerostatic stability analysis of suspension bridges
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DOI：
10.1016/j.engstruct.2005.10.008
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发表时间：
2006-04
影响因子：
5.5
通讯作者：
V. Boonyapinyo;Yingsak Lauhatanon;P. Lukkunaprasit
中科院分区：
文献类型：
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作者：
V. Boonyapinyo;Yingsak Lauhatanon;P. Lukkunaprasit
通过直接包括以下三种组合效应来研究大跨度悬索桥的非线性空气静力稳定性分析：(1) 非线性三分量位移相关风荷载、(2) 几何非线性和 (3) 材料非线性。非线性三分量位移相关风载荷包含在作为攻角函数的静态空气动力系数中。使用单元几何刚度矩阵考虑各种结构屈曲，例如弯曲屈曲、扭转屈曲和弯曲扭转屈曲。使用集中塑性铰模型控制材料非线性。风致空气静力不稳定的分析模型是使用有限元方法建立的，考虑了位移相关风荷载的三个分量以及几何和材料非线性。数值算例是在主跨长度为 1990 米的明石海峡大桥的三维有限元模型上进行的。结果表明，大跨悬索桥的空气静力失稳是由这三种因素共同作用造成的。结果还表明，非线性空气静力不稳定的临界风速明显低于弹性颤振速度。
Nonlinear aerostatic stability analysis of long-span suspension bridges is studied by including directly the three combined effects of: (1) nonlinear three-component displacement-dependent wind loads, (2) geometric nonlinearity, and (3) material nonlinearity. The nonlinear three-component displacement-dependent wind loads are included through the static aerodynamic coefficients as a function of angle of attack. The various structural bucklings, such as flexural buckling, torsional buckling and flexural-torsional buckling, are considered using the element geometric stiffness matrix. Material nonlinearity is controlled using the concentrated plastic hinge model. The analytical modeling of wind-induced aerostatic instability is formulated using the finite-element method, taking into account the three components of displacement-dependent wind load as well as geometric and material nonlinearities. The numerical examples are performed on a three-dimensional finite-element model of the Akashi Kaikyo Bridge with a main span length of 1990 m. The results show that the aerostatic instability of the long-span suspension bridge is caused by the three combined effects. The results also indicate that the critical wind velocity for nonlinear aerostatic instability is significantly lower than the elastic flutter velocity.