背景和共振分量在风振时频域计算中的分离方法

为深入分析结构风振响应时域计算结果,提出了一种在时域计算中分离背景和共振分量的方法。在结构动力响应频域和时域计算理论分析的基础上,分别以弹簧振子和悬臂杆件这两个单、多自由度结构的风振响应为例,通过时域计算对所提出的方法进行了验证,并与传统的频域结果进行了对比。经理论分析和单自由度算例验证对比,证实所提出的方法概念清晰且简单有效,可以从总动力响应时程中准确分离得到纯粹的共振响应时程,并且对多自由度结构也可得到准确的共振分量。另外,对风振计算中的背景和共振耦合分量也进行了分析。

A Method of Separating the Background and Resonant Components of Wind Dynamic Effects in Time Domain

To further interpret the dynamic results in time domain, a method of separating the background and resonant components in time domain is proposed. Based on the theory of dynamic calculation in frequency and time domains, the proposed method is examined through a SDOF oscillator and a MDOF cantilever beam under dynamic wind actions, and the results are also compared with those from the calculation in frequency domain. According to the theoretical analysis and example illustration, it is proved that with clear concept and simple application, the new method can separate the resonant component from the total dynamic responses precisely for MDOF structures. Moreover, the coup? ling component between the background and resonant components is also studied.