摘要
干煤棚结构一般采用轻质屋面体系,是一种典型的风敏感结构。因此,风荷载是控制结构设计的主要侧向荷载之一,是进行结构设计不可忽视的问题。本文对两个矢跨比相同而分别在端截面采用开口形式和采用半球形网壳封闭形式的干煤棚(柱面和球面网壳组合式干煤棚)进行了刚性模型风洞测压试验,对干煤棚结构表面的平均风压的分布特征、极值风压系数随风向角的变化以及周边的干扰效应进行了研究。同时,就端部开口及端部封闭对风荷载分布的影响进行了比较和分析。研究发现,端部半球形封闭使得干煤棚整体结构转接过渡自然,表面不存在尖锐棱角,不会出现大的旋涡脱落,可有效减小干煤棚边缘处20%~40%的平均风荷载,其结果可以供设计同类工程修建或扩建时参考。
Dry coal shed is typical wind-sensitive structure because of the light-weight roof. Wind load is one of the control loads of dry coal shed,and can't be ignored in structure design. Based on the rigid wind tunnel tests of two kinds of dry coal sheds,whose rise-span-ratiosare samewhile withdifferent end section( one is open,and the other one uses the combination of hemispherical reticulated and cylindrical shell). The distribution characteristics ofthe mean wind pressure coefficients and variation of the extreme wind pressure coefficient with wind direction angleson dry coal sheds arestudied.The interference effects of the surrounding structures are also considered. In the meantime,the influence of coal shed open-end and closed-end to the wind load distributionisdiscussed. It is found that the hemispherical shape makestransition nature,and there is no sharp edge on the surface,so wind loads are smaller. The closed-end design effectivelyreducesof the average windpressure coefficients by 20% to 40%. By data analysis,the experiment results can be used for dry coal shedexpanding or similar projects.
出处
《建筑结构》
CSCD
北大核心
2016年第S1期963-968,共6页
Building Structure
基金
国家自然科学基金资助项目(51178352
51378396)
关键词
干煤棚
风洞试验
网壳结构
风压系数
端截面
coalshed structure
wind tunnel test
network shell structure
windpressure coefficient
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