Equivalent static wind load estimation in wind-resistant design of single-layer reticulated shells
Equivalent static wind load estimation in wind-resistant design of single-layer reticulated shells
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DOI：
10.12989/was.2005.8.6.443
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发表时间：
2005-11
影响因子：
1.6
通讯作者：
Yuanqi Li;Y. Tamura
中科院分区：
文献类型：
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作者：
Yuanqi Li;Y. Tamura
对于大跨度单层网壳来说，风荷载是非常重要的，在某些情况下甚至占主导地位。目前，在结构设计中，与低层建筑的抗风设计一样，通常采用基于拟稳定假设的静力等效方法。然而，要确定一个合适的等效静力风荷载，以便充分考虑风的脉动分量对结构性能，特别是对结构稳定性的影响，并不是一件容易的事。根据风洞中同步测量的风压分布，研究了风荷载脉动分量对单层球面网壳模型稳定性的影响。综述了等效静力抗风设计中估算等效静力风荷载分布的几种方法。从稳定性的角度出发，提出了一种考虑脉动分量对壳体稳定性影响的最不利风荷载分布估计方法。最后，通过不同方法的对比分析，验证了该方法在单层网壳结构抗风分析中的有效性。
Wind loading is very important, even dominant in some cases, to large-span single-layer reticulated shells. At present, usually equivalent static methods based on quasi-steady assumption, as the same as the wind-resistant design of low-rise buildings, are used in the structural design. However, it is not easy to estimate a suitable equivalent static wind load so that the effects of fluctuating component of wind on the structural behaviors, especially on structural stability, can be well considered. In this paper, the effects of fluctuating component of wind load on the stability of a single-layer reticulated spherical shell model are investigated based on wind pressure distribution measured simultaneously in the wind tunnel. Several methods used to estimate the equivalent static wind load distribution for equivalent static wind-resistant design are reviewed. A new simple method from the stability point of view is presented to estimate the most unfavorable wind load distribution considering the effects of fluctuating component on the stability of shells. Finally, with comparisive analyses using different methods, the efficiency of the presented method for wind-resistant analysis of single-layer reticulated shells is established.