基于累积损伤的弯矩曲率强度退化滞回模型

Reinforced Concrete Strength Degradation Hysteretic Moment curvature Model Based on Cumulative Damage

摘要:

建立了钢筋混凝土构件强度退化的一般数学表达式，提出了以损伤值为变量的强度退化函数概念，指出强度退化模型的本质就是确定强度退化函数.以Kawashima实验室1997年进行的一组试验为基础，通过考察不同加载路径对构件强度退化的影响，在弯矩 曲率层面上建立了强度退化函数的具体表达形式.分析结果表明，所建立的滞回模型能够反映强度退化现象，与实验结果吻合较好.用S.K.Kunnath等人1997年完成的另一组试验进行了验证，进一步说明所建立强度退化滞回模型的适用性.

Abstract:

General mathematical expression of strength degradation is established for reinforced concrete members. The concept of strength degradation function is set with damage index being its variable. It is pointed out that the essence of strength degradation model is to determine the strength degradation function. The specific expression of the strength degradation function is established based on a set of experiments made in Kamashima Library in 1997. The influence of loading paths on the strength deterioration is examined in these experiments. The numerical result and the experimental phenomena are in good agreement. The established hysteretic model can reflect the strength degradation phenomenon well. The proposed hysteretic model is further proved to be suitable by another group of tests made by Kunnath K S, et al. in 1997.