索桁架结构体系找形分析的节点位移法_田广宇.pdfVIP

17 3 空 间 结 构 Vol. 17 No . 3 2011 9 SPAT IA L ST RUCT URES Sep. 2011 田广宇, 郭彦林, 王 昆 ( , 100084) : , . . , . , ( A NSY S) . ( ) , . , , . , , . : ; ; ; : T U351 : A : 1006-6578( 2011) 03-0020-07 Nodal displacement method for form-finding analysis of cable-truss structure systems T IA N Gu ng-yu, GU O Y n-lin, WANG Kun ( Dep artment of Civ il Eng ineering , Tsinghua University , Beij ing 100084, China) Abstract: C ble-truss nd sp ti l c ble structures combined by c ble-truss re w idely used in flex ible structures. Their stiffness depends on c ble pre- stresses. It is the m in t rget of for m-finding process to find the ppr opr i te distribution of c ble pre-str esses w hich s tisfy the requirement of rchitecture nd mech nics. Comp ring to c ble dome nd singul r c ble net, the topologic property of c ble-truss structure system re more simple nd explicit . Force Density M ethod nd Dyn mic Rel x Method re used to solve form-finding problem in singul r c ble net w hich ims to find initi l configur tion fr om design-reguired pr e- stresses, nd these methods c nnot be pplied directly in gener l finite element softw re, for ex mple, ANSYS. It w ould not be v il ble to do form-finding n ly sis w ith Force Density Method or Dyn mic Rel x Method by using gener l finite element softw re, w hile these methods re usu lly used for form- finding n lysis of c ble dome or singul r c ble net . In this p per, nod l displ cement method for form- finding n lysis is developed b sed on the simple topologic property of c ble-truss structure system , w hich is differ ent from the method for c ble net using sm ll Youngs modulus. This methods solution speed is f st nd the obt ine