2025 Volume 31 Issue 79 Pages 1325-1330
An advanced evaluation method of the skeleton curve of unbonded PCaPC beams was investigated, to reproduce their load-deformation relationship more accurately. A new characteristic point where the concrete compressive stress at the extreme compression fiber reaches 0.9 times its compressive strength, 0.9σB point, was incorporated on the skeletal curve, and its evaluation method, iterative and simplified calculation methods, was proposed based on a macro model. The skeleton curve with the new characteristic point confirmed that experimental results could be more accurately reproduced than previous estimation methods. Also, the simplified calculation results showed good agreement with the iterative calculation results.
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