Probabilistic Assessment of the Importance Factor
Publication: Journal of Structural Engineering
Volume 112, Issue 10
Abstract
A probabilistic assessment of the effect of the importance factor in ANSI A58.1-1982 on the reliability of structures is performed. It is found that the change in reliability for structures within the same ANSI category may vary widely depending on which load combination controls the design. An alternate format for the importance factor, whereby the importance factor is applied to the entire load combination as opposed to just one single load, is also examined. This format, however, is unable to provide uniform changes in the reliability. Importance factors, including importance factors for live load, that would give uniform changes in reliability are proposed.
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References
1.
American Institute of Steel Construction, Proposed Load and Resistance Factor Design Specification for Structural Steel Buildings, Chicago, Ill., 1983.
2.
American National Standards Institute, American National Standard Minimum Design Loads for Buildings and Other Structures, A58.1‐1982, 1982.
3.
Ang, A. H.‐S. and Tang, W. H., “Probability Concepts in Engineering Planning and Design,” Volume II, Decision, Risk and Reliability, John Wiley and Sons, Inc., New York, N.Y., 1984.
4.
Ellingwood, B., “Safety Checking Formats for Limit States Design,” Journal of the Structural Division, ASCE, Volume 108, No. ST7, July, 1982, pp. 1481–1493.
5.
Ellingwood, B., et al., “Development of a Probability Based Load Criterion for American National Standard A58,” NBS Special Publication 577, U.S. Department of Commerce, June, 1980.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 112 • Issue 10 • October 1986
Pages: 2345 - 2349
Copyright
Copyright © 1986 ASCE.
History
Published online: Oct 1, 1986
Published in print: Oct 1986
Authors
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