Experimental study on wind load characteristics of double-sided spherical shell roof subjected to downburst

Liufeng Su

《International Core Journal of Engineering》 5卷10期 (2019/09) Pp. 40-46

https://doi.org/10.6919/ICJE.201909_5(10).0007

摘要

In order to study the roof wind pressure distribution characteristics of the double-sided spherical shell-type large-span roof structure under the flat terrain conditions under the action of the downburst, a double-sided spherical shell type large-span roof rigid scale model was fabricated based on the similarity criterion, and the impact jet was utilized. The device simulates the downburst wind field, and studies the influence of the change of the flow field position on the wind pressure distribution of the upper and lower roofs, the extreme position of the wind pressure and its numerical value. The test results show that with the increase of the radial distance under the flat working conditions, the windward surface of the roof gradually changes from positive pressure to negative pressure, and the negative pressure extreme value appears at the edge of the windward surface. The wind pressure on the lower roof wind gradually increases. Decrease, but always maintain a positive pressure. The position of the double-sided spherical shell roof model in the wind field has a great influence on the positive and negative wind pressure transition of the upper and lower roof, the position where the extreme wind pressure appears, and the numerical value of the wind pressure distribution. The closer the model is to the impact At the jet center, the vertical wind pressure is more obvious.

關鍵字

Double-sided spherical shell roof ； downbrust ； wind tunnel test ； wind pressure characteristic

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