professor ben schafer's thin-walled structures research group - johns hopkins university

 

Reliability of Advanced Analysis of Steel Frames

 

    Advanced analysis methods are presently being considered for adoption in U.S. design specifications for steel frames. Strength predictions by advanced analysis are expected to be more accurate than those made by LRFD provisions, which can ultimately lead to more efficient designs. This paper compares the structural reliability of sixteen two-bay, two-story frames designed by conventional LRFD methods to those designed with advanced analysis. Gravity loads and member yield stresses are modeled as random variables. Non-linear structural simulations are used to generate strength distributions, from which reliabilities are estimated based on first-order methods and importance sampling. Bias factors and resistance factors necessary to achieve a specific target reliability are calculated for each frame. The results provide insight into the probabilistic differences between design by advanced analysis and elastic-LRFD methods, and begin to provide probabilistic justification for resistance factors used with advanced analysis.

 

    Professor Buonopane is continuing his efforts in this area, now at Bucknell University. Please see him for up to date references and information.

 

References:

Buonopane, S.G., Schafer, B.W., Igusa, T. (2003). "Reliability Implications of Advanced Analysis in Design of Steel Frames." Annual Technical Session and Meeting, Structural Stability Research Council, April, 2003. Baltimore, MD. (conference presentation) (pdf of paper)

 

Buonopane, S.G., Schafer, B.W., Igusa, T. (2003). "Reliability Implications of Advanced Analysis in Design of Steel Frames." Advances in Structures: Steel, Concrete, Composite and Aluminum - ASSCCA'03, Sydney, Australia, June 23 - 25, 2003 (conference presentation) (pdf of paper)

 

 

 

last edited on 10/18/06

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