空间桁架的几何稳定性-传力路线及受力敏感度分析

肖为民孙连宏柴明(130011):,,:ANALYSISOFTHEGEOMETRICSTABILITY,LOADTRANSFERPATHSANDSTRESSSENSITIVITYOFSPACETRUSSXiaoWeiminSunLianhongChaiMing(MMIPlanning&EngineeringInstituteIXChangchun130011)Abstract:Thestressperformanceofthespacetrussasaroofstructuralsystemisstudiedfromgeometricstability,loadtransferpaths,stresssensitivity,inordertogivetheoreticreferencesforstructuremodelselecting,modelling,detaileddesignorcheckofdrawings.Keywords:structuresystemdegreeoffreedomconstraintgeometricstabilityquadrangularpyramidgridspacetrussdegreeofstaticallyindeterminacyloadtransferpathsstresssensitivity:19427E-mail:[e-mail]:2008-03-15,,,;,;,,11),,;,,,,,,,,2),;,,,3),,,,,,,,,221几条基本原理1),2):,6,,,(3),xyz,3),22IndustrialConstructionVol38,No9,2008工业建筑2008年第38卷第9期,,,,4),3,(),,22理论公式F=3J-M-R(1):J,M,R,R6F0,;F0,,,;F=0,;F0,;F23举例,1~5a-J=5,M=8,R=6,F=10,;b-J=5,M=9,R=6,F=0,;c-J=5,M=8,R=7,F=0,1Fig.1SinglepyramidJ=20,M=48,R=7,F=50,2Fig.2Single-rowquadrangularpyramidsystem3,,,J=20,M=54,R=7,F=-10,3Fig.3Single-spandelspacetrussJ=20,M=54,R=7,F=-10,:F0,4Fig.4TheextremesofmisarrangedmembersJ=94,M=270,R=9,F=50,5Fig.5Compositedelspacetruss31几条基本经验1):3,3,,,,,2):,,,,67,,,32正放四角锥体系的几何稳定性可能存在的缺陷及改进措施1),,,,,23空间桁架的几何稳定性传力路线及受力敏感度分析肖为民,等(),8a-;b-;c-,6Fig.6Theplanorelevationofthesystem7Fig.7Theaddedbraceforlargersizeplan8Fig.8Asinglequadrangularpyramidmaybeflattened:,,,,,,(),4,(3)2),4(3),,333连续多个锥体三角形立体桁架1):,4,,,,2),3),,4),,,,5),4CAD(),,,41正确建模及自检CAD,,,,,,,,42数据检查,,;,,,43计算结果分析,,,,,,44采用节点平衡图解法分析,,,24工业建筑2008年第38卷第9期45综合注意事项,551对空间桁架整体稳定性的评价1),,,8,,2),,,,;,,9,,9Fig.9Layoutofhorizontalsupportofbottomchordoflargegridframeforaproject52空间桁架抽杆的注意事项1),,,:,2),,,,3),,,661分析传力路线的意义和方法1),,,()(),,,,;,,2);,,,,,62立体桁架的传力路线分析1):1011:,,,;,;4,4;2,10Fig.10Single-rowquadrangularpyramidsystem11Fig.11Typicaldelspacetruss2):;,,V,,12~15771结构受力敏感度概念和影响因素711,,,,;,,71225空间桁架的几何稳定性传力路线及受力敏感度分析肖为民,等a-,;b-,12()Fig.12Diagramofloadtransferpathofsingle-spantruss(1)a-;b-13()Fig.13Diagramofloadtransferpathofsingle-spantruss(2)14Fig.14Diagramofhorizontalloadtransferpathattheendofmillbuilding15Fig.15Theloadtransferpathofacomplexspacetruss1):,,2):,,3):,,4):(),;,,5):6):(),;,,,72立体桁架受力敏感度分析1),,,;,2):,,,,81),,,2)(),3),,,4),,,,5)6),,,,,26工业建筑2008年第38卷第9期