Low-cycle fatigue mashing behaviours of HTRB630 high-strength steel exposed to high temperatures

Abstract

AbstractThe tensile test and low-cycle fatigue test of HTRB630 high-strength steel bars after high-temperature exposure were investigated. Based on the plastic strain energy density theory of mashing behaviours, the values of parameters K and n in the Ramberg–Osgood stress–strain relationship were obtained. The Coffin–Manson model was modified for further modelling of specimens exposed to different temperatures. A fitted formula for the relationship between the plastic strain energy density and fatigue life of HTRB630 high-strength steel bar specimens was established. The parameters obtained in this study can provide a reference for further investigation of the seismic performance of HTRB630 steel bars reinforced concrete structures after exposure to high temperatures.KEYWORDS: HTRB630 high-strength steel barshigh temperature exposurelow-cycle fatigue propertymashing behaviourmodified Coffin–Manson model AcknowledgementsThis research has been supported by China Scholarship Council; the Natural Science Research Project of Jiangsu Province Colleges and Universities (21KJD560002), China; Suqian Natural Science Foundation Project (K202012), China; Project funded by the research and innovation team of engineering structure seismic technology of Suqian University in 2020, China; Suqian City Guiding Science and Technology Plan Project (Z2020137), China; Research and Innovation Team Project of Suqian College (2021TD04), China; and the Fifth Provincial Research Funding Project of ‘333 High-level Talent Training’ in 2020 (BRA2020241), China; The Youth Fund Project of Suqian College (2023XQNA03).Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Project funded by the Research And Innovation Team of Engineering Structure Seismic Technology of Suqian University in 2020, China; Suqian City Guiding Science and Technology Plan Project [grant number Z2020137]; the Natural Science Research Project of Jiangsu Province Colleges and Universities [grant number 21KJD560002]; The Youth Fund Project of Suqian College [grant number 2023XQNA03]; China Scholarship Council; Suqian Natural Science Foundation Project [grant number K202012]; the Fifth Provincial Research Funding Project of “333 High-level Talent Training” in 2020 [grant number BRA2020241]; Research and Innovation Team Project of Suqian College [grant number 2021TD04].