干扰条件下煤棚结构风致干扰特性研究

邻近煤棚及内部煤堆的干扰导致干煤棚结构的风致响应特性非常复杂.基于刚性模型风洞试验的结果,采用平稳激励下随机振动的模态叠加法(CQC法)计算了干煤棚结构的风致响应.研究了有(无)干扰条件下干煤棚的风致响应特性.首先分析了无干扰状态下煤棚结构的风致响应,指出当风向与正方向偏向30°～45°时峰值响应出现最大绝对值.接着定义了位移峰值干扰因子,研究了不同风向时,在外界干扰及不同风场影响下干扰效应的特点,指出了干扰效应比较显著的情况.同时发现尽管存在干扰很大的情况,但对于起控制性的工况,外界干扰的存在仅仅使最大峰值响应相对无干扰时略为增大.

Interference effects on wind-induced responses of dry coal sheds

The interference effects of neighboring dry-coal sheds and the internal coal stacks within the investigated dry-coal shed probably make the wind-induced responses of the dry-coal shed more complicated. In order to provide a systematic method to study the characteristics of dry-coal sheds with/without interference condition, wind-induced responses are calculated in this paper. The wind-induced dynamic responses are calculated in frequency domain using mode superposition method (CQC method), based on the wind pressure distributions on roof from wind tunnel tests on the rigid models. The wind-induced responses under no-interference conditions are firstly analyzed, and the results show that the responses of some typical nodes are largest when the structure is subjected to skew wind. Through the analysis of interference factors, the characteristics of interference effects under different interference conditions and wind directions are investigated, the cases where the interference effects are stronger are pointed out. Meanwhile, it is found that interferences only had small effect on the largest total peak displacement for the control condition.