- 摘 要
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沈國輝， 孫炳楠， 樓文娟
(浙江大學土木系，杭州 310027)[摘要] 分析了封閉型和敞開型兩種大跨結構屋面風荷載的分布特征。對于封閉型，屋面的迎風區(qū)域由于受柱狀渦和錐形渦的作用而產生極大的負風壓，其他區(qū)域風壓較??；對于敞開型，迎風時上下表面呈“上吸下頂”的風壓疊加組合，背風時呈“上吸下吸”的風壓抵消組合。同時討論了附近的構筑物對屋面風荷載的氣動干擾作用，在不同的風向下，干擾體與屋面的相對位置產生不同的干擾效果。
[關鍵詞] 大跨屋蓋；風洞試驗；風壓分布；干擾效應Characteristic of wind load on long-span roof
Shen Guohui, Sun Bingnan, Lou Wenjuan
(Department of Civil Engineering, Zhejiang University, HangZhou 310027, China)Abstract: The two elementary categories of long-span roof, which are closed and open, are studied to decide the fundamental regularity of wind load on the roof by the wind tunnel tests on various roof shapes. As to the closed type, the windward region of the roof will suffer high suctions caused by cylindrical and conical vortices while the rest regjon suffer small wind load. As to the open type, the cantilevered canopy will suffer the most severe wind load with the combination of suction on upper surface and pushing on lower surface in windward direction. And in leeward direction the canopy will suffer small wind load due to the counteracting effect of suction on both surfaces. The influence of nearby interfering object to the roof is investigated.
Keywords: long-span roof; wind tunnel test; wind pressure distribution; interfering effect
