局部贯穿开洞对高层建筑风致响应的研究
发布时间：2018-12-15 03:02
【摘要】：风灾造成的损失是各种自然灾害中最大的,同时风能作为可再生资源,可在楼层壁面高处设置贯穿开洞以安置风能发电机为高层建筑提供能源支持,成绿色节能建筑。壁面局部贯穿开洞增加了高层建筑物风场特性的复杂程度,风荷载作为高层建筑结构一种控制性水平荷载,实际工程对受壁面局部贯穿开洞影响的高层建筑结构抗风性能研究的需求提高。鉴于工程抗风实际需要,本文首先建立4组缩尺比为1：300的不同壁面贯穿开洞方式(短边侧面,长边侧面和两侧面贯穿开洞模型)的刚性模型,采用风洞试验方法模拟在国家荷荷载(GB5009-2012)规定的B类地貌条件的风场特性；其次建立全尺寸数值刚性壁面模型,运用大涡模型(LES)开展模拟试验,并对不同洞口宽度(洞口与壁面宽度比K/L为20%,30%,40%)的高层建筑风场特性展开讨论。本文共设置7组不同工况对壁面局部贯穿开洞高层建筑物模型的风场特性展开研究。主要开展以下研究：1、高层建筑不同壁面贯穿开洞方式对风压系数的影响；2、不同壁面贯穿开洞方式对高层建筑周边流场特性的影响；3、不同壁面贯穿开洞方式对洞口内风速发展的影响；4、壁面局部贯穿开洞对高层建筑的影响范围；5、不同洞口宽度对高层建筑物风场特性的影响。通过对比分析,得出以下几点结论：1、采用的数值模拟方法有效模拟高层建筑壁面局部贯穿开洞的风场特性。2、壁面贯穿洞口中线(F截面)的风压系数,在单侧开洞模型迎风面受贯穿开洞影响的区域大小接近洞口本身的大小；两侧开洞模型的洞口周边两侧的风压系数呈现与单侧相似的发展趋势,但风压系数的影响幅度要小于相同测点的单侧局部贯穿开洞模型。相比风洞试验迎风面,数值模拟获得风压系数两边受影响更明显,呈现更大的不规律性,尤其是两侧壁面局部开洞模型两边受呈现更大的不规律性。4组壁面局部贯穿开洞模型在另外两侧与风洞试验值相似(除洞口外),其值波动较小,并且模拟值的绝对值要大于实验值。工况4(风向角45度)下影响程度最大,为最不利工况。3、F截面测点的风压系数Cpi最大值受影响不明显,但Cpi最小值影响较大,两侧壁面局部贯穿开洞模型的测点受到影响幅度介于单侧壁面局部贯穿开洞之间；4、洞口内的风速要明显高于同一高度处风速亦高于在屋顶处风速值,达到了1.5-1.8倍；5、各工况下,不同洞口宽度的数值模型与来流方向成较小交叉角度主要呈现先递增、趋于稳定后递减的发展趋势,不同洞口宽度数值模型的F截面出口范围内,以数值模型M6(K/L=40%)减幅最大,M3(K/L=30%)最小。
[Abstract]:The damage caused by wind disaster is the biggest among all kinds of natural disasters, and wind energy, as a renewable resource, can be set up through holes in the wall of the floor to provide energy support for high-rise buildings and become a green energy-saving building. The complexity of wind field characteristics of high-rise building is increased by local perforation of wall. Wind load is regarded as a kind of controlled horizontal load for high-rise building structure. The research on the wind resistance of high-rise building structures affected by the local perforating holes on the wall is required in practical engineering. In view of the actual need of engineering wind resistance, this paper first establishes four groups of rigid models of different wall perforation modes (short side, long side and two side piercing model) with a scale ratio of 1: 300. Wind tunnel test method is used to simulate the wind field characteristics of class B geomorphological conditions under national load (GB5009-2012). Secondly, the full-scale numerical rigid wall model is established and the wind field characteristics of high-rise buildings with different orifice widths (K / L = 20 / 40%) are discussed by using large eddy model (LES). In this paper, seven groups of wind field characteristics of the wall local perforated high-rise building model are studied under different working conditions. The main research work is as follows: 1, the influence of different wall perforation ways on wind pressure coefficient of high-rise buildings, 2, the influence of different wall perforation modes on the characteristics of flow field around high-rise buildings; 3, the influence of different wall perforation modes on the wind velocity development in the hole; 4, the influence range of the wall local perforation on the high-rise building; 5, the influence of the different opening width on the wind field characteristics of the high-rise building. By comparison and analysis, the following conclusions are drawn: 1. The numerical simulation method is used to simulate the wind field characteristics of the wall of high-rise building. 2, the wind pressure coefficient of the middle line (F section) of the wall through the opening of the hole. The size of the region affected by the piercing hole on the upwind surface of the unilateral opening model is close to the size of the opening itself. The wind pressure coefficient of both sides of the tunnel opening model is similar to that of one side, but the influence range of the wind pressure coefficient is smaller than that of the single side local perforation model with the same measuring point. Compared with the upwind surface of wind tunnel test, the two sides of the wind pressure coefficient obtained by numerical simulation are affected more obviously and show greater irregularity. In particular, there is a greater irregularity on both sides of the local hole opening model on both sides of the wall. On the other side of the model, the local perforation model is similar to the wind tunnel test value (except for the hole opening), and the fluctuation of the value is relatively small. And the absolute value of the simulated value is larger than the experimental value. Under condition 4 (wind direction angle 45 degrees), the influence degree is the biggest, which is the most unfavorable condition. The maximum value of wind pressure coefficient (Cpi) at the measurement point of 3F section is not affected obviously, but the minimum value of Cpi has a great influence on it. The influence of local penetration on both sides of the wall is between one side and one side. (4) the wind speed in the hole is obviously higher than that at the same height and also higher than that at the roof, reaching 1.5-1.8 times; 5. Under different working conditions, the numerical model with different orifice width and the direction of the inlet flow show a small cross angle which increases first, tends to stabilize and then decreases, and in the range of the F-section exit of the numerical model of different orifice width, The numerical model M6 (K / L 40%) has the largest decrease, and M 3 (K / L 30%) is the smallest.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.213
本文编号：2379847
[Abstract]:The damage caused by wind disaster is the biggest among all kinds of natural disasters, and wind energy, as a renewable resource, can be set up through holes in the wall of the floor to provide energy support for high-rise buildings and become a green energy-saving building. The complexity of wind field characteristics of high-rise building is increased by local perforation of wall. Wind load is regarded as a kind of controlled horizontal load for high-rise building structure. The research on the wind resistance of high-rise building structures affected by the local perforating holes on the wall is required in practical engineering. In view of the actual need of engineering wind resistance, this paper first establishes four groups of rigid models of different wall perforation modes (short side, long side and two side piercing model) with a scale ratio of 1: 300. Wind tunnel test method is used to simulate the wind field characteristics of class B geomorphological conditions under national load (GB5009-2012). Secondly, the full-scale numerical rigid wall model is established and the wind field characteristics of high-rise buildings with different orifice widths (K / L = 20 / 40%) are discussed by using large eddy model (LES). In this paper, seven groups of wind field characteristics of the wall local perforated high-rise building model are studied under different working conditions. The main research work is as follows: 1, the influence of different wall perforation ways on wind pressure coefficient of high-rise buildings, 2, the influence of different wall perforation modes on the characteristics of flow field around high-rise buildings; 3, the influence of different wall perforation modes on the wind velocity development in the hole; 4, the influence range of the wall local perforation on the high-rise building; 5, the influence of the different opening width on the wind field characteristics of the high-rise building. By comparison and analysis, the following conclusions are drawn: 1. The numerical simulation method is used to simulate the wind field characteristics of the wall of high-rise building. 2, the wind pressure coefficient of the middle line (F section) of the wall through the opening of the hole. The size of the region affected by the piercing hole on the upwind surface of the unilateral opening model is close to the size of the opening itself. The wind pressure coefficient of both sides of the tunnel opening model is similar to that of one side, but the influence range of the wind pressure coefficient is smaller than that of the single side local perforation model with the same measuring point. Compared with the upwind surface of wind tunnel test, the two sides of the wind pressure coefficient obtained by numerical simulation are affected more obviously and show greater irregularity. In particular, there is a greater irregularity on both sides of the local hole opening model on both sides of the wall. On the other side of the model, the local perforation model is similar to the wind tunnel test value (except for the hole opening), and the fluctuation of the value is relatively small. And the absolute value of the simulated value is larger than the experimental value. Under condition 4 (wind direction angle 45 degrees), the influence degree is the biggest, which is the most unfavorable condition. The maximum value of wind pressure coefficient (Cpi) at the measurement point of 3F section is not affected obviously, but the minimum value of Cpi has a great influence on it. The influence of local penetration on both sides of the wall is between one side and one side. (4) the wind speed in the hole is obviously higher than that at the same height and also higher than that at the roof, reaching 1.5-1.8 times; 5. Under different working conditions, the numerical model with different orifice width and the direction of the inlet flow show a small cross angle which increases first, tends to stabilize and then decreases, and in the range of the F-section exit of the numerical model of different orifice width, The numerical model M6 (K / L 40%) has the largest decrease, and M 3 (K / L 30%) is the smallest.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.213
【参考文献】
相关期刊论文 前1条
1 陈水福,孙炳楠,唐锦春;建筑风载的数值模拟及其在微机上的实现[J];计算力学学报;1997年03期
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