United States Department of Transportation
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Computer Models Identify Methods to Reduce Bridge Cracks During Production Processes : Brief
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2012-06-01
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Alternative Title:Finite Element Analysis of Deep Wide-Flanged Pre-stressed Girders
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Edition:Brief.
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Abstract:While most motorists see only the bridge deck, strong bridge girders are the basis for a stable system to support the traffic-handling surface. Concrete bridge girders often have two major components: the web, which is an I-shaped cross section and vertical element for resisting shear forces; and flanges, which are horizontal elements that resist bending.
Wisconsin has developed a special series of flanged girders, called “W” girders. To increase performance, these girders are precast and prestressed in a production facility. The prestressing process casts concrete around tensioned steel strands that run the horizontal length of the girder. The strands may be straight or draped, with the latter being angled through the web plan to balance internal stresses. After the concrete hardens, strands are detensioned by cutting the link between the girder and stretching mechanism and relieving the tensile forces. After detensioning, the strands contract and the internal forces strengthen the concrete load. Girders may also be strengthened with vertical steel reinforcement bars.
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[PDF-766.51 KB]
