复杂城区场地粗糙度指数的风洞试验研究  

Wind tunnel test studying on roughness index of complex urban sites

作　　者：周文军 郑世雄 祝东红 沈国辉[2] ZHOU Wenjun;ZHENG Shixiong;ZHU Donghong;SHEN Guohui(Taizhou Jingzhu Review Center of Construction Drawing,Taizhou 317700,China;Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]台州市精筑建设工程施工图审查中心,浙江台州317700 [2]浙江大学结构工程研究所,杭州310058

出　　处：《振动与冲击》2025年第5期149-154,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(52178511)。

摘　　要：针对某复杂城区场地进行风速测试的风洞试验,获得24个风向角的平均风速剖面并拟合得到粗糙度指数,以此确定各个风向角的地面粗糙度类别,同时研究了上游迎风区域扇形角度对试验结果的影响。结果表明:迎风区域为城区与山地混合地貌时更容易发展成C类地貌;24个风向角的粗糙度指数值拟合优度均大于0.95,说明指数律能很好地表达该复杂城区地貌的平均风速剖面;迎风区域扇形角度对城市地面粗糙度类别有较大影响,当扇形角度为70°~180°时,平均风速剖面和拟合的指数均非常接近,而当迎风角度为30°~60°时指数变小,可以确定上游扇区迎风角度70°为最小扇区角度,该值与ASCE和EN规范的90°规定值比较接近,建筑结构荷载规范建议180°迎风半圆的范围过大。Here,wind tunnel tests of wind speed measurement were conducted for a certain complex urban site to obtain average wind speed profiles of 24 wind angles,roughness indexes were obtained through fitting for determining ground roughness categories of various wind angles.At the same time,effects of upstream windward area sector angle on the test results were studied.The results showed that when windward area is a mixed terrain of urban and mountainous landforms,it is more likely to develop into class C landforms;goodnesses of fit for roughness indexes of 24 wind angles all are larger than 0.95,so exponential law can well express average wind speed profile of complex urban terrain;windward area sector angle has a larger impact on roughness categories of urban ground;average wind speed profiles and fitted indexes are very close when upwind sector angles are 70°-180°,while indexes decrease when upwind sector angles are 30°-60°;the upstream sector area windward angle 70°is determined as the minimum sector area angle,it is close to the specified value 90°in ASCE and EN specifications;the recommended range of 180°windward semicircle in the building structural load code is too large.

关 键 词：指数律 地貌粗糙度 风洞试验 风向角 迎风夹角 

分 类 号：TU312.5[建筑科学—结构工程]