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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 31
Edited by: B.H.V. Topping
Paper V.2

Optimization of Steel Girder Bridges: Comparison of ASD, LFD and LRFD Design Philosophies

T.E. Fenske* and M. Yener#

*Department of Civil Engineering, University of Louisville, Louisville, USA
#Department of Civil and Environmental Engineering, Utah State University, USA

Full Bibliographic Reference for this paper
T.E. Fenske, M. Yener, "Optimization of Steel Girder Bridges: Comparison of ASD, LFD and LRFD Design Philosophies", in B.H.V. Topping, (Editor), "Developments in Computer Aided Design and Modelling for Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 101-107, 1995. doi:10.4203/ccp.31.5.2
The optimum design of a steel girder is very complex due to the interdependence of the constraints involved. The behavior constraints applied to any given problem depend upon the type of design philosophy utilized. The American Association of State Highway and Transportation Officials (AASHTO) allows the use of three distinct design approaches: Allowable Stress Design (ASD), Load Factor Design (LFD), and Load and Resistance Factor Design (LRFD). A computer program has been developed to compare these design philosophies on the basis of cost which utilizes structural optimization as an integral component of the bridge design process.

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