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Parametric vibration of stay cables induced by axial white noise excitation
Author(s): 
Pages: 535-541
Year: Issue:  6
Journal: Journal of Vibration Engineering

Keyword:  斜拉索白噪声参数激振统计矩截断法数值模拟;
Abstract: 建立了在考虑垂度以及拉索张力沿索长变化时拉索的参激随机微分方程,给出了在白噪声随机激励下预测拉索响应的近似理论解--用统计矩截断法求解矩方程,获得高斯闭合解和一阶非高斯闭合解.并采用数值模拟方法进行验证.随后以南京长江二桥A20拉索为研究对象,采用MonteCarlo数值方法对近似理论解进行验证.最后分析了白噪声激励强度、拉索阻尼及拉索张力对响应的影响.结果表明,斜拉索在零均值随机位移激励下的响应为非零均值;在高斯白噪声激励下的一阶位移响应随激励强度的增大而增大.随拉索阻尼和张力增大而减小.
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