复杂环境中玻璃幕墙设计风压风洞试验

Wind tunnel test for design wind pressure of glass curtain wall in complex environment

风荷载是引起玻璃幕墙结构破坏的主要荷载之一,目前相应规范在玻璃幕墙设计风压取值上尚未考虑相邻建筑物的影响,其结果已经不能完全覆盖处于特定风场中的幕墙设计要求。通过风洞试验,得到了处于复杂环境中的玻璃幕墙设计风压值,介绍了目前中美两国规范关于玻璃幕墙风荷载取值的计算方法,探讨了试验值与中美两国规范计算值之间的差异。分析结果表明:对于处在复杂环境中的玻璃幕墙,现有规范设计风压的取值不是偏大就是偏小,尤其是在建筑底部的局部区域可能出现远大于规范计算值的负风压。所得结果可供同类幕墙工程设计参考。

The wind load is the main destructive cause of glass curtain-walls, while present codes about the value of wind load on the glass curtain-walls do not consider the effect of the adjacent buildings, therefore, the relative regulation do not contain all the design demand of the glass curtain-walls in particular wind field. So this paper, based on the wind tunnel test, obtained the wind pressure of glass curtain-walls, then introduced the calculation method of wind load on glass curtain walls and discussed the difference between the values from test and code calculation. The results indicate that for the glass curtain-walls in complex enviromnent, the design wind pressure in present Code is either larger or smaller, and local area of the building bottom would has very large wind suction. The results from the analysis can also give reference to other same kind of projects.