Cast - in - place prestressed concrete slab is mainly adopted to 2- girder bridges with the aim of rationalization and labor-saving. However, it is reported that cracks sometimes occur near by rigid cross beams several months after construction because of concrete's creep and shrinkage under restraint from the rigid beams and vertical stiffeners. In recent years, it is reported that sunshine, is supposed to induce the deformation of PC slab, and it is one of the reason of cracks. In this paper, stress conditions and efficiencies of prestressing in PC slab are evaluated by finite element analysis. The results indicate that cast in place PC slab near cross beams should be designed reducing live load stress and recognizing range of temperature of slab by sunshine.
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