Residual mechanical behavior of (SD 500) hot rolled TMT reinforcing steel bars after elevated temperatures

This paper intends to present an experimental investigation carried out to study the influence of elevated temperatures on residual mechanical properties of super ductile (SD 500) hot rolled deformed TMT bars in comparison with conventional hot rolled and ordinary TMT steel bars. The study also presents a detailed analysis of effect of heating on residual ductility characteristics of SD 500 rebars after exposure to various temperatures using various prevalent methods in the available literature. The experimental study involved heated residual tensile tests carried out on rebar specimens after being exposed to elevated temperatures and subsequently cooling down to ambient conditions covering a wide range of available sizes (8 mm, 10 mm, 12 mm, 16 mm and 20 mm). A detailed description of the test results, observations and discussion on results obtained from the testing, including comparisons with the available information in the existing relevant literature have been presented with particular emphasis on the influence of high temperature on ductility of super ductile (SD 500) hot rolled TMT bars. The results so obtained suggest better performance of SD TMT over ordinary TMT and conventional hot rolled rebars in terms of key aspects of mechanical behavior after exposure to elevated temperatures. The outcomes of this study have direct implications on procedures used for predicting the ultimate behavior of structural elements during and following exposure to elevated temperatures. (C) 2018 Elsevier Ltd. All rights reserved.