高层建筑地震非平稳随机阻尼控制研究
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摘要
运用复模态分析方法,推导出受阻尼器控制具有非比例阻尼特性的高层建筑在地震作用下体系响应的时变功率谱密度函数矩阵;构造一动力结构体系,将非平稳随机问题转化为确定性问题。为了避免复数运算和减少计算工作量,又把不能解耦的构造方程转化为控制方程求解。最后把传统的实模态叠加法和迭代法相结合,求解控制方程的解,计算各楼层响应的时变方差。算例表明,取结构前3~4个振型便能得到很好的精度,且收敛速度快。
A modal iterative method for the seismic response analysis of non-proportional damped systems subjected to nonstationary random excitations is presented in this paper . The auto-and cross-PSD function matrix of the structural resporses is described firstly by means of the complex modal method because of the evident damping levels of the damping - controllers . The non- proportional damping matrix is divided into two parts : the proportional part for dissipation of energy and the non-proportttonal part for transformation of energy . The coupled equations in generalized coordinates are solved by an iterative process in which the coupling terrns are treated as pseudctforces . Numerical examples show the good convergence characteristics of the process and . the good accuracy of the obtained results.
引文
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