【摘要】 研究外荷载为长期非平稳随机过程。考虑长期荷载的特性 ,采用 1个概率谱密度函数来反映长期非平稳随机荷载及其特征 ;概率谱密度函数是基于大量的一般谱密度函数的统计特性获得。以延长结构的抗疲劳使用寿命为目标函数 ,提出了调谐质量减振阻尼器的优化设计方法 ,这在实际工程中有着极为广阔的应用前景。本文旨在从理论上发展长期非平稳随机荷载作用下调谐质量减振阻尼器的优化设计方法 ;文中采用长期波浪实测数据 ,给出了 1个数值算例说明整个设计过程。更多还原

【Abstract】 In this paper the random process with the loading being nonstationary for a long term is considered.An obvious engineering application of the new consideration is to design a tuned mass damper (TMD) to prolong the fatigue life of a structure, and in the case long term loading characteristics must be considered. The long term nonstationary loading is characterized by using a probabilistic power spectral density (PPSD) function. The PPSD should be derived from thousands of ordinary power spectral density functions. The main objective is to develop the theoretical optimal design of a TMD undera a long term nonstationary loading. A numerical example is also presented to illustrate the developed design procedure.更多还原