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Prestressed Composite Box Girders for Highway Bridges

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In a PC (prestressed concrete) box girder, the need to contain and deviate the longitudinal tendons of internal prestressing increases the web thickness and the self-weight of the deck. As a span increases, the reduction of dead load is a primary need. It is the most important load, resisted first by the construction equipment, and then by the structure itself. Reductions to dead load permit savings in equipment costs while creating a reserve for service loads. External prestressing allows the combination of conventional materials to create innovative prestressed composite structures (PCS). On the longest spans, variable depth PCSs built by balanced cantilevering are less affected by construction stresses. On shorter spans, the same goals can be met with both incremental launching and segmental construction with launching gantries.
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Keywords: Deformability; Folded orthotropic steel plates; Prestressed composite box girders; Prestressing; Stiffened plate girders; Truss schemes

Document Type: Research Article

Publication date: 01 November 1997

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    Structural Engineering International (SEI), the quarterly Journal of IABSE, published since 1991, is the leading international journal of structural engineering dealing with all types of structures and materials. SEI offers its readers a unique blend of short profiles on recent structures, and longer, in-depth technical articles on research, development, design, construction and maintenance. Articles are written by practicing engineers and academia from around the world and reflect the high standards of IABSE. IABSE Peer Review stamps are given to papers that have passed through a highly selective review process and demonstrate a significant contribution to the state of structural engineering knowledge.To recognise contributions of the highest quality, an Outstanding Paper Award is presented each year.

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