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| Research on the Prestressed Tendon Arrangement and Stress Calculation of Prestressed Concrete Continuous Girder with Segmental Construction |
| LIU Jing-mian |
| The Third Railway Survey and Design Institute Group Corporation, Tianjin 300142, China |
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Abstract Research purposes ； The segmental casting method is often used in the full framing construction of prestressed concrete continuous girder because concrete casting in - site is too much. In order to counteract the contraction crack of concrete, the prestressing often needs to the concrete of girder. Taking one continuous girder of Taiyuan - zhongwei - Yinchuang Railway for example, this paper, through comparing the advantages and disadvantages of three arrangements methods of prestressed tendons, studies prestressed tendon arrangement and prestressing calculation of prestressed concrete continuous girder with segmental construction.
Research conclusions ： It is proposed to adopt the tendons arrangements in full framing segmental construction when the connector can not be used because the construction site is small. The short tendons are stretched and anchored at the toothed plates and the long tendons are stretched and anchored at the ends of girder. The calculation and control of prestress in prestressed concrete continuous girder should be done according to the theoretical thickness of beam and the construction age，final tension age and the elastic ratio of concrete to counteracted the effect of concrete contraction with tensile stress.
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Received: 24 September 2008
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2008, Vol. 25 
