Pre-yielding effects of ASTM A992 steel at elevated temperatures

Abstract

This paper presents the results of a test program where samples of ASTM A992 steel were first subjected to pre-yielding at room temperature, and subsequently tested at elevated temperature. Elevated temperature properties of previously yielded steel may be of interest for structures that experienced a fire following another extreme event that caused pre-yielding, such as an earthquake, terrorist attack and normal fabrication practices such as a straightening or cambering of members. The pre-yielding was simulated with two categories for both 0.5% and 8% as minor and major pre-yielding respectively, to reflect possible scenarios as practical industrial issues. The minor pre-yielding is used to mimic the potential pre-yielding introduced by normal fabrication practices of steel and the major pre-yielding is used to reflect the large strain deformations induced from a seismic event or enormous deformation due to an unexpected accident. A testing program was undertaken by the authors to measure the mechanical properties of ASTM A992 steel at elevated temperature after pre-yielding. This paper will present results and provide data on the effect of pre-yielding and heating process on key mechanical properties, including yield strength, tensile strength, elastic modulus and elongation.