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3. 4) Mutsuyoshi, H., Tsuchida, K., Matupayont, S. and Machida, A.: Flexural Behavior and Proposal of Design Equation for Flexural Strength of Externally Prestressed Concrete Members, Concrete Library of JSCE, No. 28, pp. 65-77, 1996.
4. 5) Aravinthan, T., Mutsuyoshi, H., Fujioka, A. and Hishiki, Y.: Prediction of the Ultimate Flexural Strength of Exter-nally Prestressed PC Beams, Proceedings of JCI, Vol. 19, No. 2, pp. 1233-1238, 1997.