李正農 范濤 康建彬 程杰 吳濤 謝俊軍



摘要:根據剛性模型風洞測壓試驗所得數據,研究了不同的周邊干擾條件下柜體表面平均風壓系數的變化規律,對比分析了不同柜體間距時干擾效應的變化情況。研究結果表明:干擾煤氣柜位于柜體的正前方時,柜體迎風面平均風壓系數顯著減小;干擾煤氣柜位于柜體的正后方時,柜體背風面平均風壓系數會增大;兩煤氣柜相互平行時,柜體背風面平均風壓系數會減小;柜體間距會對干擾效應產生影響,干擾效應隨著柜體間距的變化而發生變化;在迎風面與側風面,規范值有較高的安全儲備;而在背風面,其安全儲備略有不足。
關鍵詞:煤氣柜;干擾;風洞試驗;平均風壓;柜體間距
中圖分類號:TU973
文獻標志碼:A 文章編號: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
大型煤氣柜屬于特種鋼結構,由于有較大的儲氣量要求,往往設計成外壁薄且尺寸巨大的懸臂圓筒型結構,其風荷載作用的效應非常明顯,可能成為煤氣柜設計的控制荷載。中國現行《建筑結構荷載規范》中的風荷載條文以及傳統的抗風設計方法均不適用于大型煤氣柜這類特種鋼結構[1-3],風洞試驗是確定煤氣柜抗風設計所需風荷載參數的主要手段。
近年來,許多學者對煤氣柜的抗風問題進行了研究。陳寅等[4]通過風洞試驗分析煤氣柜表面風壓分布狀況,并將不同高度處的平均風壓系數值與規范值進行對比,得出把荷載規范所規定值直接用于此類特殊結構將偏于保守的結論。……