Interactive Bridge Optimization Programby T. E. Fenske, Univ of Louisville, Louisville, KY, USA,
M. Yener, Univ of Louisville, Louisville, KY, USA,
Abstract: This paper presents the development of a design methodology that includes the structural optimization process as an integrated component of girder bridge design. The optimization process is based upon minimum cost of the superstructure using unit price values, but also allows for bridge examination based upon weight. The constraints are imposed according to the American Association of State Highway and Transportation Officials (AASHTO) specifications with the option of using either the Working Stress or Load Factor Design methods. Both the bridge concrete roadway deck and steel girders are considered in the optimization process. This process allows the steel girders to be fabricated with either stiffened or unstiffened webs, but restrict the optimization to evaluation of a single depth girder throughout the span length. The effect of utilizing fabricated girder sections composed of various plate thicknesses, widths, and depths causes a variation in section properties throughout the girder, and this nonprismatic member effect is included in the optimization and analytical processes.
Subject Headings: Bridge design | Highway and road design | Girder bridges | Computer aided design | Load and resistance factor design | Bridge components
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