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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 31
DEVELOPMENTS IN COMPUTER AIDED DESIGN AND MODELLING FOR STRUCTURAL ENGINEERING 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
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
Abstract
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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