Stress-strain curves of prestressing steel after exposure to elevated temperatures

To evaluate the damage to a structure after fire exposure, the residual mechanical properties of structural materials need to be evaluated first. A literature review is conducted to analyse the major factors influencing the post-fire properties of prestressing steel. Existing test data are collected from an extensive survey of the available literature. A simplified stress-strain model is developed for prestressing steel in residual conditions (i.e. after heating and cooling to room temperature). Measured stress-strain curves are used to verify the accuracy of the proposed model.