抄録
A validity of the existing prediction equations for the ultimate tendon stress in beams prestressed with unbonded tendons was examined by large number of experimental data. The predicted results of tendon stress at ultimate were discussed in terms of several factors that were found important to affect the ultimate tendon stress. A parametric study was performed in order to propose a new prediction equation for computing the tendon stress at ultimate in beams prestressed with internally unbonded tendons. The accuracy of the proposed equation for tendon stress was verified by comparing the predicted results with the experimental results, which were collected in the available literature.
