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1、国家体育场大跨度钢结构修改初步设计摘 要:在国家体育场修改初步设计中首次采用CATIA软件,解决复杂建筑的空间建模问题;中厚钢板采用Q345GJ钢材,有效降低了用钢量;在进行大跨度结构计算与优化时,分别考虑了常遇地震、中震与罕遇地震作用;提出太阳辐射引起结构温升的计算方法,合理确定安装合拢温度;运用单元逐次激活的技术,进行施工过程分析;根据管桁架和次结构杆件的特点,合理确定压杆的计算长度系数;研究了在次结构薄壁箱形构件内部设置纵向加劲肋对改善板件局部稳定性及延性的影响;提出主桁架单K节点、双K节点、桁架柱带有内部加劲肋节点及铸钢转换节点构造;通过动力
2、特性分析,确认了立面大楼梯在人群挤塞荷载下的舒适性L关键词:复杂结构建模;高强钢材;结构优化;温度场;施工模拟;整体稳定;计算长度;加肋箱形构件;复杂节点;立面楼梯中图分类号:TU245.4;TU393.3文献标识码:A文章编号:100626578(2005)0320003211RevisedpreliminarydesignofsteelstructureofNationalStadiumBeijingFANZhong,WUXue2min,YUYin2quan,HUChun2yang,HUTian2bing,FANXue2wei,LIUXian2m
3、ing,WANGZhe,ZHAOLi2hua,LIMing,LIUYan,DONGQing2yuan,PENGYi,WANGChun2guang,FANYu2chen,TANCheng2dong(ChinaArchitectureDesign&ResearchGroup,Beijing100044,China)Abstract:CATIAsoftwareisusedtobuildthecomplicatedgeometricmodelintherevisedpreliminarydesignofNationalStadiumBeijing.Q345G
4、Jisadoptedforthicksteelplates,whichreducesthestructuralweighteffectively.Thefrequentearthquake,moderateearthquakeandrareearthquakeeffectsarecalculatedintheoptimumdesignofthestructure.Amethodtoestimatetemperaturearisenfromthesunradiationispresentedandfinalerectiontemperatureisde
5、cidedreasonably.Theelement“deathandbirth”techniqueisemployedforsimulatingtheconstructionprocedure.AccordingtothestructuralfeatureoftheHSStrussandthesecondarystructure,theeffectivelengthfactorsofthecompressedmembersaredefinedreasonably.Theeffectsoflongitudinalstiffenersinsidethi
6、n2wallboxsectionsonthecapacityoflocalbucklingresistanceandtheductilityofthemarestudied.DetailsaboutsingleK2connection,doubleK2connectionforthemaintruss,connectionswithinnerstiffenersforthetrusscolumn,andthecaststeelconnectionareprovided.Theacceptanceofthefacadestaircasewithdens
7、epeopleisguaranteedbydynamicanalysis.Keywords:complicatedgeometricalmodel;high2strengthsteel;structuraloptimization;temperaturefield;erectionprocedureanalysis;overallstability;effectivelength;boxsectionswithinnerstiffeners;complicatedconnections;facadestaircase度为127.5mL大跨度屋盖支承在
8、24根桁架柱之上,1 概 述柱距为37.958mL主桁架围绕屋盖洞口环梁放射形布置,有22榀主桁架直通或接近
