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http://dx.doi.org/10.12989/sem.2004.17.6.879

A continuity method for bridges constructed with precast prestressed concrete girders  

Lee, Hwan Woo (Department of Civil Engineering, Pukyong National University)
Barnes, Robert W. (Department of Civil Engineering, 238 Harbert Engineering Center, Auburn University)
Kim, Kwang Yang (Department of Civil Engineering, Pukyong National University)
Publication Information
Structural Engineering and Mechanics / v.17, no.6, 2004 , pp. 879-898 More about this Journal
Abstract
A method of making simply supported girders continuous is described for bridges with spans of 30-45 m. The splicing method takes advantage of an induced secondary moment to transform the self-weight stresses in the precast simply supported girders into values representative of a continuous girder. The secondary moment results from prestressing of continuity tendons and detensioning of temporary tendons in the girders. Preliminary sections are selected for spliced U-girder bridges with a range of span lengths. Use of the proposed technique results in girder depth reductions of 500-800 mm when compared to standard simply supported I-girder bridges. The flexural behavior of an example bridge with 40-m spans is examined to illustrate the necessary considerations for determining the optimum sequence of splicing operations.
Keywords
bridge; continuity method; prestressed concrete; secondary moment; staged prestressing; structural efficiency; U-girder;
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