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该文以我国HRB400钢筋为研究对象,首先对其进行了单调拉伸试验和恒应变幅值循环加载试验,得出HRB400钢筋的基本力学性能参数、应变幅值-疲劳周期数和应变幅值-强度退化系数值关系式及疲劳参数的取值;然后,根据试验所得到的材料性能参数,在Open Sees软件中,选用Reinforcing Steel钢筋本构模型对本次试验进行了模拟,验证了试验数据处理结果的准确性和实用性;最后评价了HRB400钢筋的低周疲劳特性,为建立基于材料层次的精细化钢筋混凝土结构数值纤维模型提供了重要的试验参考依据。
In this paper, the HRB400 rebar in our country is taken as the research object. Firstly, the monotonic tension test and the cyclic loading test of constant strain amplitude are carried out. The basic mechanical properties of HRB400 rebar are obtained, and the strain amplitude - fatigue cycle number and strain amplitude - Strength degradation coefficient value and the fatigue parameter. Then based on the material performance parameters obtained from the experiment, Reinforcing Steel reinforced constitutive model was selected in Open Sees software to verify the experimental data processing The accuracy and practicability of the results. Finally, the low cycle fatigue behavior of HRB400 rebar was evaluated, which provided an important experimental reference for establishing a numerical fiber model of the refined RC structure based on material level.