屋面坡度小于5%（2.86度）即为平屋面。 坡屋面和平屋面的划分以坡度大小而定，平屋面并不是绝对的平，也是有坡度的，只是很小而已，否则无法排出屋面积水。尚无法规严格界定，防水界认为坡度大于10%（5°48'）即为坡屋面。屋面坡度小于5%（2°54'）系为平屋面。
关键词：坡屋面、平屋面、结构方案、斜梁 [gap=547]Key words: sloping roof, flat roof, structural scheme, pitched rafter ...
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常规屋面结构大多数为钢筋混凝土现浇或装置式的平屋面。
Routine roof covering structure great majority are that the armoured concrete shows the dyadic flat Ao Yu device roof covering.
双层屋顶设计是为了解决平屋面容易渗漏、隔热和保温差及水资源利用问题。
The double roofs is designed for the anti seepage, heat insulation and insulation. The roof rainwater can be collected for ordinary use.
屋面刚度及来流风速对大跨度平屋面的竖向风振响应影响比较大，但对位移风振系数的影响不太明显；
The influences of roof stiffness and wind velocity on wind-induced dynamic response are considerably large, while the influences on wind load factor are slight.
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