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[提要]通過對寶安體育館進(jìn)行風(fēng)洞試驗(yàn)，對體育館懸挑屋蓋的平均風(fēng)壓和脈動風(fēng)壓分布以及總升力進(jìn)行了分析討論，并進(jìn)一步對體育館屋蓋的測點(diǎn)脈動風(fēng)壓功率譜進(jìn)行了分析。屋蓋懸臂梁的迎風(fēng)面和背風(fēng)面的測點(diǎn)脈動風(fēng)壓功率譜表現(xiàn)出顯著的差異，迎風(fēng)面測點(diǎn)的脈動風(fēng)壓功率譜曲線在較低的頻率出現(xiàn)駝峰，而背風(fēng)面測點(diǎn)的脈動風(fēng)壓功率譜曲線在較高的頻率出現(xiàn)駝峰。測點(diǎn)脈動風(fēng)壓功率譜曲線上出現(xiàn)的駝峰可能與測點(diǎn)所在區(qū)域的漩渦的脫落有關(guān)。有關(guān)結(jié)論對進(jìn)一步開展大跨屋蓋的研究提供了+定的參考依據(jù)。

[關(guān)鍵詞] 大跨懸挑屋蓋 平均風(fēng)壓 脈動風(fēng)壓 功率譜密度

Abstract:Surface pressure distribution on a flat gymnasium roof is discussed. Mean pressure and fluctuating pressure coefficients on the roof were measured by wind tunnel experiment. Meanwhile, maximum and minimum peak pressure coefficients on the roof were determinedly. Furthermore, the power spectra of fluctuating wind pressures on the roof were also analyzed. The results show that the spectra of windward pressure taps are significantly different with those of leeward pressure taps. Humps on spectra are observed at lower frequency at windward taps, while those are observed at higher frequency at leeward taps. These humps may be related with the vortex shedding at those regions.