Multiscaling aspects of fail-safe for material and structure
A fail-safe index l is advocated for ranking the integrity of bridges and buildings although the approach can be applied to any structure and/or material in general. The combined effects of material, geometry and loading are included in this index. A multi-component structure would entail l <,1>, l<,2>, …, l<,n> with n being the total number of members or sub-sections in the system. If l<,B> is known for a building or bridge such that l<,B>=l<,B> (l<,1>, l<,2>, …, l<,n>) then fail-safe can be pre- determined by controlling l<,B> in relation to l<,C> which is the ultimate limit set for total disaster. Determination of l is demonstrated for structural components from a knowledge of the local and global energy density function. The fracture path in a component can thus be controlled by optimizing the material with geometry under a given loading. The process can then be extended to that of a structure with multi-components. The time dependent character
Fail-safe index Energy density Maximum Minimum Dilatational Distortional Fracture Yielding Local and global Bridge and building Progressive collapse Redundant members Micro- and macro-fracture toughness and strength.
G. C. Sih
Mechanical Engineering and Power Equipment Department, East China University of Science and Technology, Shanghai 200237, China Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem 18015, USA
国际会议
国际断裂力学2007年会(Fracture Mechanics and Applications 2007)
长沙
英文
1-13
2007-11-01（万方平台首次上网日期，不代表论文的发表时间）