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1、第31卷第10期2010年10月003建筑结构学报JournalofBuildingStructuresVol31No10Oct2010文章编号:10006869(2010)10001707开合屋盖体育场风荷载特性试验研究李寿科,李寿英,陈政清(湖南大学风工程试验研究中心,湖南长沙410082)摘要:建筑立墙迎风面开孔时内部风压随开口处外压变化显著,使得屋盖所受净压显著增大,其测量值往往大于规范取值。而对于屋盖顶部开孔的建筑,其内部风荷载我国规范没有相应取值。为了进行开合屋盖结构设计和探讨屋盖顶部开孔对屋盖风荷载变化的影响,以1300的几何缩尺比制作了一个开合屋顶体育场的
2、刚性模型,在B类地貌中对该体育场固定、活动屋盖的上、下表面进行了风洞测压试验,得到了屋盖上、下表面的体型系数、平均风压系数、脉动风压系数和极值风压系数。试验结果表明:活动屋盖的开启,可有效减小固定屋盖和活动屋盖的平均风荷载,引发整个结构承受向下的风荷载;活动屋盖开启将增大固定屋盖和活动屋盖的净脉动风荷载;活动屋盖开启将减小固定屋盖和活动屋盖的极小值风荷载,且固定屋盖上的最大极小值风压系数的位置往屋顶开口方向移动。关键词:大跨度钢结构;活动屋盖;风洞试验;风压系数;体型系数中图分类号:TU3933TU3121TU3171文献标志码:AExpermientalinvestiga
3、tiononwindloadingofastadiumwitharetractableroofLIShouke,LIShouying,CHENZhengqing(WindEngineeringResearchCenter,HunanUniversity,Changsha410082,China)Abstract:Inthecaseofabuildingwithadominantwindwardopening,theinternalpressurecloselyfollowstheexternalpressureattheopening,andthenetroofpressureswill
4、beincreasedsignificantlywhichwerenormallylargerthanthosederivedfromsomecodes.Currentlyforthestructureswithopeningsontheroofs,theinternalwindpressurevalueswerenotprovidedinChinesecode.Fortheamiofstructuraldesigningaswellasforthepurposeofstudyingtheeffectsofthewindloadsonthemainroofwithretractabler
5、oofsopening,arigidtestmodelofastadiumwithretractableroofwasbuiltwithgeometricalscaleof1300.Windtunneltestswerecarriedouttomeasurethewindpressuresonthefixedroofandtheretractableroofinturbulenceflow.Thecharacteristicsofshapecoefficient,meanwindpressurecoefficient,fluctuatingwindpressurecoefficient
6、andextremewindpressurecoefficientsonthefixedroofandretractableroofwereparticularlystudied.Itisshownthatretractableroofsopeningreducesthemeanwindloadsonboththefixedandretractableroofgreatly,andwillmakethemainroofexperiencedpositivepressures.Inthecaseofretractableroofopening,thefluctuatingwindloads
7、ofthefixedroofandretractableroofareincreased,whichcomparedtothatoftheclosedcase.Fortheretractableroofinopenedcondition,theextremewindloadsonbothfixedandretractableroofwillbedecreased,andthemaxmiumextremewindloadswillbe
