Reliability Analysis of Weldings Considering Defects

by J. Nienstedt, Univ of Innsbruck, Austria,
H. J. Pradlwarter, Univ of Innsbruck, Austria,
R. A. Dietrich, Univ of Innsbruck, Austria,
G. I. Schuëller, Univ of Innsbruck, Austria,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


The welds generally represent the most critical part of large structural systems, i.e. offshore structures. Hence they affect significantly the structural reliability. A realistic model of the weld should include inevitable defects which occur due to the manufacturing process as well as the nonlinear material behavior under extreme loads. These effects and the geometry of the structure are modeled using finite element analysis. The limit state is evaluated as function of the loads, welding defects and material strength. The failure probabilities are calculated by applying an importance sampling procedure using design points in connection with the response surface method.

Subject Headings: Structural reliability | Structural analysis | Finite element method | Defects and imperfections | Welding | Offshore structures | System reliability | Welded connections

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