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借助三分力系数的桥梁颤振稳定性评价

, PP. 68-73

Keywords: 桥梁工程,颤振,试验研究,三分力系数,悬索桥,气动阻尼

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Abstract:

?为了借助简单的测力试验结果快速评价桥梁结构的颤振稳定性,利用理论分析方法给出影响桥梁颤振稳定性的系统牵连扭转运动阻尼比的简化表达式。采用Fung公式计算颤振导数A2*,利用Scanlan公式计算颤振导数A1*和H3*,可以较好地将三分力系数与颤振导数联系起来。结果表明:三分力系数斜率与桥梁颤振稳定性有一定关系,主梁断面的升力系数斜率与升力矩系数斜率乘积C'LC'M越小,越有利于桥梁的颤振稳定性;当颤振导数A1*H3*为负值时,有利于减小气动负阻尼,对结构起到稳定作用;应用此方法可以快速对比不同方案的颤振性能,便于气动选型。

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