高强度建筑钢筋HRB500的动力本构模型

发布时间：2018-04-05 22:24

  本文选题：HRB钢筋　切入点：本构模型　出处：《建筑材料学报》2014年04期

【摘要】：对高强度建筑钢筋HRB500在应变率(ε·)为4.9~59.0s-1下的力学行为进行了试验研究,并以钢筋力学性能特征值和Johnson-Cook模型(J-C模型)为基础分别建立了两类HRB500钢筋动力本构模型.结果表明:HRB500钢筋的力学性能呈应变率相关性.随着应变率的增大,钢筋的屈服强度、极限强度以及极限强度对应的应变提高;在相同应变率条件下,钢筋屈服强度动力提高系数大于极限强度动力提高系数.相比较低强度的HPB235,HRB335以及HRB400钢筋,HRB500钢筋的应变率敏感性稍弱.建议以钢筋力学性能特征值为基础建立的动力本构模型可用于描述3.0×10-4s-1≤ε·≤50.0s-1时HRB500钢筋的力学行为,而以J-C模型为基础建立的动力本构模型仅用于描述1.0s-1≤ε·≤50.0s-1时HRB500钢筋的力学行为.
[Abstract]:The mechanical behavior of high strength building steel bar (HRB500) under strain rate (蔚) as 4.9~59.0s-1 is studied experimentally, and two kinds of dynamic constitutive models of HRB500 steel bar are established based on the characteristic value of mechanical properties of steel bar and the Johnson-Cook model (J-C model).The results show that the mechanical properties of the W HRB500 steel bar show a strain rate correlation.With the increase of strain rate, the yield strength, ultimate strength and strain corresponding to ultimate strength of steel bar increase, and under the same strain rate, the coefficient of dynamic improvement of yield strength of steel bar is greater than the coefficient of dynamic improvement of ultimate strength.The strain rate sensitivity of HPB235 HRB335 and HRB400 reinforced HRB500 is weaker than that of HPB235 and HRB500 with low strength.It is suggested that the dynamic constitutive model based on the eigenvalue of mechanical properties of steel bar can be used to describe the mechanical behavior of HRB500 steel bar when 3.0 脳 10-4s-1 鈮，

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