大跨度屋盖结构等效静力风荷载中共振分量的确定方法研究

STUDY OF THE RESONANT COMPONENT OF EQUIVALENT STATIC WIND LOADS ON LARGE SPAN ROOFS

大跨度屋盖结构等效静力风荷载中的共振分量确定,包括对结构共振响应的准确计算以及如何将其等效为静力风荷载这两个主要问题。针对第一个问题,提出Ritz-POD法分析该类结构的风振响应,以解决在结构风振响应分析中存在的多振型参与结构振动且高阶振型对结构风振响应贡献可能较大这一问题;针对第二个问题,将等效静力风荷载的共振分量表示为各Ritz向量的等效惯性力的组合。对一鞍型索网结构的等效静力风荷载分布情况进行了分析;结果表明,能够有效地解决大跨度屋盖结构等效静力风荷载的确定问题。

It is important to determine the wind-induced response accurately and formulate the component of equivalent static wind loads of large span roofs reasonably. Ritz Vector Method and Proper Orthogonal Decomposition （POD） technique are employed to analyze wind-induced response of these structures, in order to take into account the multimode buffeting response and the case that structures vibrate with high frequency modes. The resonant component of equivalent static wind load can be formulated in terms of these modal inertia loadings. Moreover, the resonant component of equivalent static wind loads is analyzed for a saddle-shape cable structures with this method. The result shows that it is effective and efficient to solve these problems with this method .