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Structural Engineering and Mechanics Volume 17, Number 6, June 2004 , pages 879-898 DOI: https://doi.org/10.12989/sem.2004.17.6.879 |
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A continuity method for bridges constructed with precast prestressed concrete girders |
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Hwan Woo Lee, Robert W. Barnes and Kwang Yang Kim
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| 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. | ||
| Key Words | ||
| bridge; continuity method; prestressed concrete; secondary moment; staged prestressing; structural efficiency; U-girder. | ||
| Address | ||
| Hwan Woo Lee; Department of Civil Engineering, Pukyong National University, San 100, Yongdangdong, Namgu, Busan 608-739, Korea Robert W. Barnes; Department of Civil Engineering, 238 Harbert Engineering Center, Auburn University, Alabama 36849-5337, U.S.A. Kwang Yang Kim; Department of Civil Engineering, Pukyong National University, San 100, Yongdangdong, Namgu, Busan 608-739, Korea | ||