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Constructional Steel Design presents state-of-the-art knowledge on the design of steel structures. Independent of national design codes, subjects include materials aspects of steel as well as metallurgy, fatigue, corrosion, inspection, fire protection, element behaviour and strength.
Specification for design, of steel box girder bridges are proposed for the AASHTO Specification for Highway Bridges. Load Factor Design approach is used. In the design of compression flanges residual stresses and geometric imperfections are considered. For unstiffened flanges a new strength curve is proposed. Strength of stiffened flanges is given as a function of geometric parameters by interaction diagram based on second order analysis. Strength of webs is obtained as a sum of elastic buckling strength, and a lower limit of tension field strength. Web stiffeners are proportioned by strength and rigidity criteria to remain straight up to ultimate web capacity. Also given are rules for design of tension flanges, diaphragms, cross frames and other members, recommended fabrication tolerances and erection provisions. Discussion of principal problems, review of current U.S. and European specifications and commentary are included.
The Proposed Design Specifications for Steel Box Girder Bridges as contained in Report No. FHWA-TS-80-205 are evaluated. The results of comparative designs done using the AASHTO code and the proposed specification are summarized. The differences in the designs are explained with reference to the differing design requirements of the two specifications. The practicality and ease of application of the proposed specification are discussed. The results of parametric studies done to investigate the application of the proposed specification to the design of principal elements of box girders are included.