Research on Rational Design of Prestressed Concrete Structures

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The purpose of this research is to evaluate the shear resisting mechanism of prestressed concrete (PC) structural members based on the mechanical consideration and to provide the adequate safety against the shear failure of PC structural members. To achieve this purpose, experimental and numerical investigations have been done during 2005 and 2006. Obtained results are as follows :In 2005, experiments and numerical analyses were carried out to evaluate the shear resisting mechanism of PC members. Various experimental data were collected throughout the world. These data were used to evaluate the accuracy and validity of the simplified truss model. Parametric numerical analyses were also performed to formulate the simplified truss model for PC structural members with shear reinforcement. Finally, the simplified truss model to explain the shear resisting mechanism of PC members has been proposed.In 2006, the experiments of externally prestressed concrete beams and also segmental PC beams with external cables were performed. These experiments have been done to examine the accuracy and validity of the simplified truss model. From the experimental and numerical examinations, it has been confirmed that the simplified truss model can be adopted to evaluate the shear resisting mechanism and also to predict the shear resisting capacity of PC members.The obtained results of this research have been published in various journals, such as JSCE Journal of Material, Concrete Structures and Pavements, and the Proceeding of Japan Concrete Institutes, etc.