封闭形式对大跨度煤棚风荷载影响研究
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摘要
煤棚属于风敏感结构,为了控制工程安全,该文进行了风荷载研究。该文通过刚性模型测压试验,分析了风向角对典型测点和分块区域体型系数和极值风压系数的影响规律,研究了全封闭状态(两端山墙)和半封闭状态(只有一端山墙)对体型系数和极值风压系数的影响规律。研究表明:与全封闭状态相比,半封闭状态下,内压对风压分布的影响程度增大,并且当开口处于迎风区,内压为正值;当开口处于背风区,内压为负值,易引起主体风荷载在某些风向角范围内产生较大力矩,将导致分块区域的极值风荷载增大。
A coal shed is a wind-sensitive structure for the sake of its characteristics of a long span, large flexibility and small damping. The study on wind load is of important engineering significance. In this paper, a rigid model manometry test was conducted to analyze the influence of the wind direction angle on the shape coefficients and the extreme wind pressure coefficients of typical measurement points and blocks. And the influences of the enclosed state(both ends of the gable) and the semi-closed state(one end gable) on shape coefficients and extreme wind pressure coefficients were studied. The results show that internal pressure will influence the wind pressure distribution more remarkably in a semi-closed state. And when the opening is in the windward area, the internal pressure is positive. when the opening is in the leeward zone, the internal pressure is negative, which easily causes a main wind load to generate a large torque in some wind direction angles, may resulting in the increase of a extreme wind load in the block area at the same time.
A coal shed is a wind-sensitive structure for the sake of its characteristics of a long span, large flexibility and small damping. The study on wind load is of important engineering significance. In this paper, a rigid model manometry test was conducted to analyze the influence of the wind direction angle on the shape coefficients and the extreme wind pressure coefficients of typical measurement points and blocks. And the influences of the enclosed state(both ends of the gable) and the semi-closed state(one end gable) on shape coefficients and extreme wind pressure coefficients were studied. The results show that internal pressure will influence the wind pressure distribution more remarkably in a semi-closed state. And when the opening is in the windward area, the internal pressure is positive. when the opening is in the leeward zone, the internal pressure is negative, which easily causes a main wind load to generate a large torque in some wind direction angles, may resulting in the increase of a extreme wind load in the block area at the same time.
引文
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[3]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 based on wind tunnel test results[J].Spatial Structures,2011,17(2):30-34.(in Chinese)
[4]马昌勤,苏晓文,邓东升.基于风洞模拟试验的干煤棚网壳结构表面风压分析[J].安徽建筑,2011,18(4):140-142.Ma Changqin,Su Xiaowen,Deng Dongsheng.Analysis of wind pressure on surface of the dry coal shed based on wind tunnel test[J].Anhui Architecture,2011,18(4):140-142.(in Chinese)
[5]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,2007,01(1):62-66.Ye Mengyang,Gu Ming,Huang Peng.Wind tunnel experimental study on shape coefficient of large-span dry-coal-sheds[J].Structural Engineers,2007,01(1):62-66.(in Chinese)
[6]周晅毅,顾明,米福生,等.干扰条件下煤棚结构风致干扰特性研究[J].振动工程学报,2009,22(6):652-658.Zhou Xuanyi,Gu Ming,Mi Fusheng,et al.Interference effects on wind-induced responses of dry coal sheds[J].Journal of Vibration Engineering,2009,22(6):652-658.(in Chinese)
[7]周晅毅,顾明,米福生,等.干扰效应下煤棚结构风致响应研究[J].同济大学学报(自然科学版),2010,22(6):652-658.Zhou Xuanyi,Gu Ming,Mi Fusheng,et al.Analysis of wind-induced responses of dry coal sheds under interference condition[J].Journal of Tongji University(Natural Science),2010,22(6):652-658.(in Chinese)
[8]黄鹏,顾明,叶孟洋.干煤棚柱面网壳结构风荷载试验研究[J].建筑结构,2011,41(增刊1):1432-1437.Huang Peng,Gu Ming,Ye Mengyang.Experimental study on wind loads on cylindrical reticulated shells[J].Building Structure,2011,41(Suppl 1):1432-1437.(in Chinese)
[9]黄鹏,兰志昆,顾明.干煤棚柱面网壳结构多参数风荷载试验研究[J].建筑结构,2015,45(17):92-98.Huang Peng,Lan Zhikun,Gu Ming.Multi-parameter experimental research of wind loads on cylindrical reticulated shell structures of dry-coal sheds[J].Building Structure,2015,45(17):92-98.(in Chinese)
[10]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,2016,46(增刊1):963-968.Zhong Qi,Lan Zhikun,Huang Peng,et al.Experimental study of wind loads on open-end and closed-end dry coal shed structures[J].Building Structure,2016,46(Suppl 1):963-968.(in Chinese)