opensees中桥梁支座模拟.doc

《opensees中桥梁支座模拟.doc》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、1、opensees中最简单的支座模拟时用0长度单元模拟支座，6个方向分别取不同的刚度值。2、ElastomericBearingElement(弹性支座)可模拟支座的屈服后刚度。ThiscommandisusedtoconstructanelastomericBearingelementobject,whichisdefinedbytwonodes.Theelementcanhavezerolengthortheappropriatebearingheight.Thebearinghasunidirectional(2D)

2、orcoupled(3D)plasticitypropertiesforthesheardeformations,andforce-deformationbehaviorsdefinedbyUniaxialMaterialsintheremainingtwo(2D)orfour(3D)directions.Bydefault(sDratio=0.5)P-Deltamomentsareequallydistributedtothetwoend-nodes.Toavoidtheintroductionofartificialvi

3、scousdampingintheisolationsystem(sometimesreferredtoas"dampingleakageintheisolationsystem"),thebearingelementdoesnotcontributetotheRayleighdampingbydefault.Iftheelementhasnon-zerolength,thelocalx-axisisdeterminedfromthenodalgeometryunlesstheoptionalx-axisvectorissp

4、ecifiedinwhichcasethenodalgeometryisignoredandtheuser-definedorientationisutilized.Foratwo-dimensionalproblem:elementelastomericBearing$eleTag$iNode$jNode$kInit$fy$alpha-P$matTag-Mz$matTag<-orient$x1$x2$x3$y1$y2$y3><-shearDist$sDratio><-doRayleigh><-mass$m>Forathre

5、e-dimensionalproblem:elementelastomericBearing$eleTag$iNode$jNode$kInit$fy$alpha-P$matTag-T$matTag-My$matTag-Mz$matTag<-orient<$x1$x2$x3>$y1$y2$y3><-shearDist$sDratio><-doRayleigh><-mass$m>$eleTaguniqueelementobjecttag$iNode$jNodeendnodes$kInitinitialelasticstiffne

6、ssinlocalsheardirection初始水平剪切刚度$fyyieldstrength屈服力$alphapostyieldstiffnessratio屈服系数-P$matTagtagassociatedwithpreviously-definedUniaxialMaterialinaxialdirection-T$matTagtagassociatedwithpreviously-definedUniaxialMaterialintorsionaldirection-My$matTagtagassociatedwit

7、hpreviously-definedUniaxialMaterialinmomentdirectionaroundlocaly-axis-Mz$matTagtagassociatedwithpreviously-definedUniaxialMaterialinmomentdirectionaroundlocalz-axis$x1$x2$x3vectorcomponentsinglobalcoordinatesdefininglocalx-axis(optional)$y1$y2$y3vectorcomponentsing

8、lobalcoordinatesdefininglocaly-axis(optional)$sDratiosheardistancefromiNodeasafractionoftheelementlength(optional,default=0.5)-doRayleightoinclud