大跨柱面网壳结构风荷载试验研究
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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,因此风荷载是结构设计中不可忽视的问题。该文以某热电厂大跨度柱面网壳煤棚工程项目为背景,为了获得准确的用于结构设计的风荷载数据,进行了刚性模型测压风洞试验,考虑了风向角、煤堆以及周边建筑的气动干扰等因素对煤棚体型系数的影响。结果表明:来流风作用在端部山墙上呈90°～120°夹角时,测点的体型系数较大。在90°来流风时,半封闭端部山墙对结构是非常不利的,来流对煤棚顶部会有更大的风荷载。根据研究发现,模型的顶部体型系数相对较大,在建设煤棚时应对其顶部进行加固。
Light-quality roof is usually adopted in the structure of a dry coal shed, which is a typical wind sensitive structure. The wind load is a problem that cannot be ignored. In order to obtain accurate wind load data for the structural design, the pressure measurements of a wind tunnel test on a rigid structural model have been carried out based on a thermal power plant coal shed project with a large span cylindrical reticulated shell. The aerodynamic influence of wind angle and surrounding buildings on the coal shed shape coefficient is investigated.The results show that the shape coefficient value at measure points is larger when the intersection angle between the wind and the mountain wall is 90°～120°. A larger wind load acts on the semi-closed gable end of the structure when the intersection angle is 90°, and the coal roof will have greater wind loading. According to the research, the shape coefficient is relatively large at the top of a coal model, the roof structure of the coal shed should be strengthened.
Light-quality roof is usually adopted in the structure of a dry coal shed, which is a typical wind sensitive structure. The wind load is a problem that cannot be ignored. In order to obtain accurate wind load data for the structural design, the pressure measurements of a wind tunnel test on a rigid structural model have been carried out based on a thermal power plant coal shed project with a large span cylindrical reticulated shell. The aerodynamic influence of wind angle and surrounding buildings on the coal shed shape coefficient is investigated.The results show that the shape coefficient value at measure points is larger when the intersection angle between the wind and the mountain wall is 90°～120°. A larger wind load acts on the semi-closed gable end of the structure when the intersection angle is 90°, and the coal roof will have greater wind loading. According to the research, the shape coefficient is relatively large at the top of a coal model, the roof structure of the coal shed should be strengthened.
引文
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[2]齐月芹,李皓玉.大跨度干煤棚网壳结构风载试验研究[J].空间结构,2010,16(4):55―59.Qi Yueqin,Li Haoyu.Large span dry coal shed net shell structure wind load test research[J].Space Structure,2010,16(4):55―59.(in Chinese)
[3]GB 50009―2012,建筑结构荷载规范[S].北京:中国建筑工业出版社,2012.GB 50009―2012,Load code for building structures[S].Beijing:China Construction Industry Press,2012.(in Chinese)
[4]钟奇,兰志昆,黄鹏,等.端部开口和封闭的干煤棚风荷载试验研究[J].建筑结构,2016,6(46):963―968.Zhong Qi,Lan Zhikun,Huang Peng,et al.Experimental study on wind loads on open and closed dry coal shed[J].Building Structure,2016,6(46):963―968.(in Chinese)
[5]齐月芹,张婷,徐步青.基于风洞试验成果的大跨度网壳结构优化[J].空间结构,2011,17(2):30―34.Qi Yueqin,Zhang Ting,Xu Buqing.Optimization of large-span latticed shell structures based on wind tunnel test results[J].Space Structure,2011,17(2):30―34.(in Chinese)
[6]齐月芹,刘灵灵.干煤棚结构风荷载风洞试验研究[J].工业建筑,2011(7):120―124.Qi Yueqin,Liu Linlin.Wind tunnel test study on wind load of dry coal shed structure[J].Industrial Building,2011(7):120―124.(in Chinese)
[7]黄鹏,兰志昆,顾明.干煤棚柱面网壳结构多参数试验研究[J].建筑结构,2015,45(17):92―98.Huang Peng,Lan Zhikun,Gu Ming.The dry coal shed cylindrical reticulated shell multi-parameter experimental study[J].Building Structure,2015,45(17):92―98.(in Chinese)
[8]马文勇,刘庆宽,肖彬,等.三心圆柱面网壳结构风荷载分布规律[J].工程力学,2011,28(2):166―170.Ma Wenyong,Liu Qingkuan,Xiao Bin,et al.Three hearts cylindrical veil shell structure wind load distribution[J].Engineering Mechanics,2011,28(2):166―170.(in Chinese)
[9]李元齐,Tamura Yukio,沈祖炎.柱面壳体表面风压分布特性风洞试验研究[J].同济大学学报(自然科学版),2006,34(11):1457―1463.Li Yuanqi,Tamura Yukio,Shen Zuyan.Cylindrical shell surface wind tunnel tests of wind pressure distribution characteristics research[J].Journal of Tongji University(Natural Science Edition),2006,34(11):1457―1463.(in Chinese)
[10]叶孟洋,顾明,黄鹏.大跨度干煤棚结构表面体型系数试验研究[J].结构工程师,2007,1(2):62―66.Ye Mengyang,Gu Ming,Huang Peng.Experimental study on surface shape coefficient of large span dry coal shed[J].Structural Engineer,2007,1(2):62―66.(in Chinese)