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《Journal of Zhejiang University(Engineering Science)》 2006-01
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Analysis of stability conditions for pin-bar mechanisms

BAO Hong-ze,DENG Hua(Space Structures Research Center,Zhejiang University,Hangzhou 310027,China)  
Structural stability conditions for pin-bar mechanism system were investigated on the basis of energy criterion.From analytical expression of tangential stiffness matrix,the structural stability of mechanisms is expounded as resulting from reinforcement of feasible internal forces caused by prestress or loading.Classical stability criterion for prestressed mechanism was rigidly proved,and clarified to be equivalent to positive definitive second-order variation of potential energy.Imperfection of this criterion was also pointed out.Further investigations on the stability of mechanism stiffened by loading were carried out,and a corresponding stability criterion was developed and explained by means of an illustrative example.Some discussions on essential of geometrical stability issue,conventional definition of structures and mechanism,and necessary condition of mechanism stability were provided in the end to improve understanding of the structural stability of pin-bar mechanisms.
【Fund】: 国家自然科学基金资助项目(50108014);; 高学学校博士点专项科研基金资助项目(20020335033)
【CateGory Index】: TU323
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1 DONG Shi-lin,YUAN Xing-fei(Space Structures Research Center,Zhejiang University,Hangzhou 310027,China);Advances in research on cable domes[J];Journal of Zhejiang University(Engineering Science);2008-01
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