ANALYSIS OF STABILITY CRITERIA OF PIN-JOINTED BARS MECHANISMS
This paper broadens conventional concepts of structural stability to explain some non-generic stability phenomena of pin-jointed bars mechanisms. Based on the energy criterion and analytical expression of tangential stiffness matrix, structural stability of mechanisms is expounded as a result from reinforcement of feasible internal forces caused by prestress or loading. Classical stability criterion for prestressed mechanism is strictly proved, and clarified to be equivalent to positive definitive second-order variation of potential energy. Imperfection of this criterion is also pointed out. Further investigations on stability of mechanisM stiffened by loading are carried out, and a corresponding stability criterion is developed and explained by means of an illustrative example. Some discussions are provided in the end to benefit understandings of structural stability of pin-bar mechanisms.
Pin-jointed bars assembly Mechanism Structural stability Geometrical stability Prestress
Hua DENG A.S.K. KWAN Hongze BAO
Space Structures Research Centre, Zhejiang University, China Cardiff School of Engineering, Cardiff University, United Kingdom
国际会议
The Second Asia-Pacific Young Researchers and Graduates Symposium(第二届亚太地区结构青年专家研讨会)
杭州
英文
48-58
2010-03-27（万方平台首次上网日期，不代表论文的发表时间）