施扰建筑高度对主建筑层升力影响的试验研究

利用刚性模型测压试验,研究了施扰建筑相对高度变化对主建筑层升力系数和层脉动升力功率谱的影响规律.试验包含了3个并列位置、5个串列位置和3个斜列位置.结果表明:建筑物并列时,高度比越大则层平均升力系数大,层脉动升力功率谱受影响的范围大;建筑物串列时,高度比对层平均升力系数的影响很小,对层脉动升力系数的大小及沿高分布形式有显著影响,施扰建筑高度超过受扰建筑时层脉动升力功率谱受到的影响很大,尤其是顶部区域;斜列工况时,并列间距比对影响规律起主导作用.

Experimental Study of Impact of Changes in Relative Height of Interfering Building on Main Building Layer Lift Force

The impact of changes in the relative height of a interfering building on main building layer lift force coefficients and lift force power spectrum was studied by rigid model pressure tests. Three side by side positions,five tandem positions and three oblique positions were considered. The results show that in the side by side cases the greater the relative height, the bigger the mean layer lift force coefficients, so as the affected height of lift force power spectrum. In the tandem cases, the relative height of the interfering building has little effect on the mean layer lift force coefficients, but it has great impact on the root mean square(RMS) of layer lift force coefficients. When the height of the interfering building exceeds that of the main building, the impact on lift force power spectrum is great, especially in the top area. In the oblique cases, the across wind spacing ratio plays a leading role in the interference law.