Limit State Sensitivity of Structural Frames Subjected to Cyclic Forces
Publication: Journal of Structural Engineering
Volume 116, Issue 10
Abstract
The reliability of structural systems often is analyzed under the assumption that the system limit states are not dependent on load path. Although brittle systems are known to be load‐path dependent, limit states for ductile frames usually are assumed to be independent of the manner in which the loads are applied. In this study, the dependence of limit states of a single‐story and multi‐story ductile frame on load path is investigated. For certain cyclic load cases, the strength of the structure decreases significantly and load‐path dependence is apparent. It is observed that this can be related to a ratcheting type phenomenon of the structure, and depends on the load sequencing and the degree of nonlinear behavior within each cycle. A load‐path‐independent lower bound limit state is formulated using shakedown theory. Reliability analyses of the different limit states are performed to determine the importance of load‐path dependence on computed system reliability.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 116 • Issue 10 • October 1990
Pages: 2824 - 2841
Copyright
Copyright © 1990 ASCE.
History
Published online: Oct 1, 1990
Published in print: Oct 1990
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