Ductility Analysis of Overload and Settlement

by Alan R. Kemp, Univ of the Witwatersrand, Johannesburg, South Africa,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation


The concept of sufficient ductility to avoid premature or brittle failures is gaining wide acceptance in structural engineering and is an important aspect in mitigating the consequences of natural hazards. A limit states (LFRD) criterion of ductility is described which may be used generally in indeterminate structures to determine whether sufficient ductility exists to develop a fully-plastic collapse mechanism. This criterion involves comparing the available rotation capacity observed in tests on structural elements with the required rotation capacity at critical plastic hinges. The available rotation capacities of pipe sections are illustrated and the parameters limiting ductility are identified. A straight-forward, linear approach for calculating required rotations of plastic hinges that has been developed by the author is described and applied to the case of a continuous steel pipeline subject to large settlements due to ground subsidence.

Subject Headings: Ductility | Failure analysis | Structural settlement | Overloads | Steel pipes | Rotation | Plastic hinges | Steel structures

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