复杂体型大跨屋盖结构的风荷载分布  

WIND PRESSURE DISTRIBUTION ON LONG-SPAN BUILDINGS OF IRREGULAR SHAPE

作　　者：沈国辉[1] 孙炳楠[1] 楼文娟[1] 

机构地区：[1]浙江大学,杭州市310027

出　　处：《土木工程学报》2005年第10期39-43,60,共6页China Civil Engineering Journal

基　　金：国家自然科学基金项目(59978044)

摘　　要：以某航站楼为例,结合平屋面分析复杂体型的屋面对风压分布的影响;结合规范值探讨幕墙外表面的附着物和周围建筑对其体型系数的影响。得出的主要结论:屋面受风最不利的位置在由柱状涡或锥形涡控制的迎风区域;屋面形状对风压影响很大,凸出部分负风压较大,凹进部分负风压很小;悬挑屋面在迎风时产生“上吸下顶”的叠加作用,其他风向为“上吸下吸”的抵消作用;幕墙外表面的附着物和周围U形排列的房屋都会增加幕墙的正风压。This paper studies the general characteristics of wind pressure distribution on the roof and curtain wall of long - span buildings with complex shape, through the analysis of a terminal building. The influence of the irregular shape of the roof on wind pressure is analyzed by a comparative study with a flat roof. The wind pressure on the curtain wall is also investigated by comparing with those in the codes. Several conclusions can be made as follows. The most dangerous part of the roof under wind effect is the windward region, sustaining cylindrical and conical vortices. The wind pressure on the roof is affected by roof shape; usually, the bulge part of the roof is sustains,severe suction while the recess part is under little suction. The wind pressures on the upper and the lower surfaces of a cantilevered roof would have a superimposing effect in windward direction and a counteracting effect in leeward direction. The wind-catching effect induces high positive wind pressure on the curtain wall, when the nearby buildings are arranged in U- shape. The attached structures outside of the curtain wall would cause the wind pressure on the curtain wall increase.

关 键 词：大跨结构 悬挑结构 风洞试验 兜风效应 

分 类 号：TU312.1[建筑科学—结构工程]