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Nonlinearities and Imperfections in Creep Stability

by P. G. Glockner, Univ of Calgary, Calgary, Canada,
W. Szyszkowski, Univ of Calgary, Calgary, Canada,



Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond

Abstract:

The effects of material and geometric nonlinearities and imperfections on the 'safe-load-limit' and the 'safe-service-period' of structures involving compression members and made of linear or nonlinear time-dependent materials was briefly reviewed. It was shown that these creep stability parameters are sensitive to such nonlinearities and imperfections and that a geometrically exact nonlinear (postbuckling) analysis appears to slow down (speed up) the viscous/creep process in globally stable (unstable) structures, as opposed to results obtained from a 'linearized' analysis. Material nonlinearity will result in imperfection sensitivity for P_v in columns analogous to the imperfection sensitivity of globally unstable structures.

Subject Headings: Material properties | Construction materials | Strength of materials | Creep | Structural stability | Geometrics | Structural safety

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