对称配筋钢筋混凝土构件基于耗能能力退化的损伤模型与性能标准

为了研究钢筋混凝土构件在地震作用下的性能评估方法,建立合理的损伤模型量化损伤,基于对称配筋钢筋混凝土(RC)构件在变幅滞回历程下耗能能力损伤机理,在研究了RC构件耗能能力退化和设计参数之间量值联系和建立耗能能力估算方法的基础上,提出了对称配筋RC构件基于耗能能力退化的损伤量化指数。基于已有不同配筋条件的9个RC构件在变幅历程下的往复加载试验,研究耗能能力损伤量化指数的评价标准。研究表明:提出的耗能能力损伤量化指数可以对不同变幅历程下的损伤过程给出统一的性能划分标准,并提出了RC构件对应于无损、轻度损伤、中度损伤、重度损伤和破坏的5个性能状态的耗能能力损伤量化指数区间;通过PEER数据库中18个受弯破坏试件对该标准进行了验证,结果具有较好的一致性。

Damage model based on degradation of energy dissipation capacity and performance level of symmetrical reinforced RC members

In order to study the performance evalution of reinforced concrete members under earthquake action and establish a reasonable damage model to quantify the damage,based on the damage mechanism of energy dissipation capacity of symmetrical reinforced RC member under variable amplitude hysteretic process, the relationship between the degradation of energy dissipation capacity and design parameters of RC members was studied. On the basis of the estimation method of energy dissipation capacity, the damage quantification index of symmetrical reinforced RC members based on energy dissipation capacity was proposed. Based on the variable amplitude loading test of the existing nine RC members with different reinforcement conditions,the evaluation criteria of damage quantification index of energy dissipation capacity was discussed.It is found that the damage quantification index could provide a unified standard of performance classification for RC members under variable amplitudes. According to the damage quantification index, five performance levels, which are no damage, mild damage, moderate damage, severe damage and failure of RC members, were proposed. The standard was verified by 18 specimens of flexural failure in PEER database with preferably consistency.