风压作用下底层架空的多层建筑对迎背风面压差的影响

Impacts of Wind Pressure Effects on the Total Pressure Differences between the Windward Face and the Leeward Face of a Bottom Overhead Multistory Construction

目的分析底层架空的多层建筑与底层非架空的多层建筑风场的分布,探讨底层架空建筑对周围风场分布的影响.方法以计算流体力学理论为基础,采用数值的方法定性的分析其迎风面与背风面的总压力之差,并与宽度和高度相同的非架空的多层建筑周围风环境进行了比较分析.结果得到了底层架空的多层建筑和底层非架空的多层建筑周围速度场、压力场、迹线图的分布情况,并对结果进行了对比、分析.结论非架空的多层建筑的迎背风面总压差随着高度增加而增加;而底层架空的多层建筑的迎背风面总压差随着高度增加而降低.在同一位置上,底层架空的多层建筑的迎背风总压差基本上都大于非架空的多层建筑的迎背风面总压差.该结论可作为底层架空的多层建筑周围风环境研究的前期指导和风洞验证.

This paper compared the wind field pressure distributions of a bottom overhead construction and a non- bottom overhead construction, discussed the effects of the bottom overhead construction to its surrounding wind field. This paper based on the method of computational fluid dynamics, simulated the wind field, analyzed the total pressure differences between windward face and leeward face, and compared these with those of the non- bottom overhead construction of the same width and height. This paper gets the distributions of velocity field, pressure field and trace line chart of the bottom overhead multistory construction and the non - bottom overhead multistory construction, and analyzed and compared their results. The total pressure differences between the windward face and the leeward face of the bottom overhead multistory construction, go up as the altitude goes up, while the total pressure differences of the non - bottom overhead multistory construction, go down as the altitude goes up. At the same altitude, the total pressure differences of the bottom overhead multistory construction are always larger than those of the non - bottom overhead multistory construction. These conclusions can be used as the wind environment research＇s guiding of the bottom overhead multistory construction and can be certified by a wind tunnel experiment.