基于多参考振型的Rayleigh阻尼系数计算方法在单层柱面网壳中的应用

Application of the multiple reference modes based computation method of Rayleigh damping coefficients in single-layer cylindrical latticed shell

传统的Rayleigh阻尼系数计算法(两参考振型法)并不总是适用于单层柱面网壳的地震时程分析,对基于多参考振型的Rayleigh阻尼系数计算方法在单层柱面网壳中的应用进行了研究.分析结果表明,在某些地震波作用下,主要贡献振型数目较多,分布较为离散,且频率值相差较大,此种情况下基于多参考振型的计算方法比两参考振型法更为合理;而在另外一些地震波下,结构的主要贡献振型数目较少,分布较为集中,且频率值较为接近,此时基于多参考振型的计算方法和两参考振型法都可以应用.

Traditional computation method（two reference modes method）of Rayleigh damping coefficients is not always suitable for the single-layer cylindrical latticed shell.So the application of the multi-mode based computation method in single-layer cylindrical latticed shell was studied.The results show that when there are many dominant modes distributing loosely and taking a wide range of frequencies under some ground motions,the multi-mode based computation method is better than the two reference modes method.And when there are few dominant modes distributing densely and taking a narrow range of frequencies under other ground motions,both the multi-mode based computation method and the two reference modes method are applicable.