APP下载

周边干扰对煤气柜表面风压的影响

2016-07-11李正农范涛康建彬程杰吴涛谢俊军

土木建筑与环境工程 2016年3期

李正农 范涛 康建彬 程杰 吴涛 谢俊军

摘要:根据刚性模型风洞测压试验所得数据,研究了不同的周边干扰条件下柜体表面平均风压系数的变化规律,对比分析了不同柜体间距时干扰效应的变化情况。研究结果表明:干扰煤气柜位于柜体的正前方时,柜体迎风面平均风压系数显著减小;干扰煤气柜位于柜体的正后方时,柜体背风面平均风压系数会增大;两煤气柜相互平行时,柜体背风面平均风压系数会减小;柜体间距会对干扰效应产生影响,干扰效应随着柜体间距的变化而发生变化;在迎风面与侧风面,规范值有较高的安全储备;而在背风面,其安全储备略有不足。

关键词:煤气柜;干扰;风洞试验;平均风压;柜体间距

中图分类号:TU973

文献标志码:A 文章编号:16744764(2016)03000111

Abstract:In order to study the variation regularity of mean wind pressure coefficients on gasholder with interference and the transformation of different distance of interference effect , pressure measurements were conducted in wind tunnel on a rigid structural model . Results showed that in the case the interferential gasholder was located in the front, the mean wind pressure coefficients of windward side would dramatically decrease; the interferential gasholder was located in the rear, the mean wind pressure coefficients of lee side would increase; two gasholder were parallel to each other, the mean wind pressure coefficients of windward side would decrease; distance had a influence on the interference effect, interference effect varid with changes of distance; the safety reserve of code values was sufficient on windward and crosswind side but slightly insufficient in windward side.

Keywords:gasholder;interference; wind tunnels; mean wind pressure; distance between gasholder

大型煤气柜属于特种钢结构,由于有较大的储气量要求,往往设计成外壁薄且尺寸巨大的悬臂圆筒型结构,其风荷载作用的效应非常明显,可能成为煤气柜设计的控制荷载。中国现行《建筑结构荷载规范》中的风荷载条文以及传统的抗风设计方法均不适用于大型煤气柜这类特种钢结构[1-3],风洞试验是确定煤气柜抗风设计所需风荷载参数的主要手段。

近年来,许多学者对煤气柜的抗风问题进行了研究。陈寅等[4]通过风洞试验分析煤气柜表面风压分布状况,并将不同高度处的平均风压系数值与规范值进行对比,得出把荷载规范所规定值直接用于此类特殊结构将偏于保守的结论。……

登录APP查看全文