Direct Shear: A Mechanism that is Often Ignored and Rarely Studied

The defect of excessive lone time deflection of prestressed concrete bridges has been researching for decades. Many researches focused on reducing the long time dead-load deflection of the completed bridge. Another research method is trial calculation, which includes adjusting prestress loss, structural stiffness, or modifying the creep model to fit the deflection changes of the real bridge. Nevertheless, there is still a lack of recognized solution. In this paper, with the continuous research on the excessive long time deflection of PC girder bridges in the Department of Bridge Engineering at Tongji University, another kind of shear caused excessive defection is proposed, which is also a mechanism that is often ignored and rarely studied: direct shear. The transverse analysis method of the box section and its influence on longitudinal direct shear are presented in detail. Finally, some research and design suggestions are put forward.

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