Wind-induced aerostatic instability of cable-supported bridges by a two-stage geometric nonlinear analysis
Wind-induced aerostatic instability of cable-supported bridges by a two-stage geometric nonlinear analysis
复制标题
DOI：
10.12989/imm.2008.1.3.381
复制
发表时间：
2008-09
期刊：
影响因子：
--
通讯作者：
Yeong-Bin Yang;J. Tsay
中科院分区：
文献类型：
--
作者：
Yeong-Bin Yang;J. Tsay
研究了斜拉桥的空气静力失稳问题，重点研究了斜拉桥各构件的几何非线性效应。对于垂度较大或较小的斜拉索，采用比桁架单元更合理的两节点悬链线单元进行模拟。空气静载荷用平均阻力系数、升力系数和俯仰力矩系数表示。在恒载和风荷载分两阶段施加的情况下，进行了几何非线性分析。以桥面俯仰角为无界条件，得到了空气静力失稳的临界风速。与文献中存在的那些不同，增量迭代过程的每个中间步骤都被清楚地给出和解释。因此，得到的桥梁解被认为比现有的解更合理。并对所研究的实例进行了比较和讨论。
The aerostatic instability of cable-supported bridges is studied, with emphasis placed on modeling of the geometric nonlinear effects of various components of cable-supported bridges. Two-node catenary cable elements, which are more rational than truss elements, are adopted for simulating cables with large or small sags. Aerostatic loads are expressed in terms of the mean drag, lift and pitching moment coefficients. The geometric nonlinear analysis is performed with the dead loads and wind loads applied in two stages. The critical wind velocity for aerostatic instability is obtained as the condition when the pitching angle of the bridge deck becomes unbounded. Unlike those existing in the literature, each intermediate step of the incremental-iterative procedure is clearly given and interpreted. As such, the solutions obtained for the bridges are believed to be more rational than existing ones. Comparisons and discussions are given for the examples studied.