ABSTRACT
Since the 2004 Sumatra earthquake, the occurrence of earthquake becomes very frequent all over the world [1, 2]. In china, 33% earthquakes are inherited on 7% land of the world, so it has most strong earthquakes in the world. Each strong earthquake may destroy a large number of buildings, which results in huge disasters and damage to property and inevitably causes some damage to the surviving buildings. As one of the most important materials to ensure the structural safety of buildings under seismic loads, the performance of the rebar will determine the anti-seismic performance of buildings [3]. At present, the HRB400E III grade steel has been promoted heavily in the construction of the earthquake zone in China. Construction steel experiences high strain low cycle fatigue process under seismic loading [4]. Zhan Suyu et al. [5] have reported the lowcycle fatigue properties of HRB400E III grade steel with diameters of 25 mm and 20 mm on InstronModel 1342 fatigue test machine.
