基于塑性应变能密度的钢筋混凝土墩柱损伤准则

Damage criterion of reinforced concrete pier based on plastic strain energy density

为建立一个能够用于评估动力荷载作用下钢筋混凝土墩柱横截面损伤情况且具有较好精度的损伤模型,本文首先基于能量平衡原理,推导了塑性应变能密度损伤准则;然后,按照裂缝扩展情况,建立了钢筋混凝土墩柱性能水平划分等级,并采用ABAQUS软件对33根钢筋混凝土墩柱拟静力试验模型进行动力损伤分析,确定了损伤指数与性能水平划分等级之间的对应关系,量化了动力荷载作用下钢筋混凝土墩柱横截面损伤评价模型;最后,引入支持向量机算法对塑性应变能密度损伤准则的归一化参数值进行预测,并通过算例验证了塑性应变能密度损伤准则和支持向量机算法用于钢筋混凝土墩柱横截面损伤分析的精度和可行性。

A damage model for accurate evaluation of the cross section damage of reinforced concrete pier under dynamic load is established.First,the damage criterion of plastic strain energy density is deduced.Then,the performance level of reinforced concrete pier is established based on the condition of crack propagation.The correspondence relationship between damage index and performance level is determined through analyzing the dynamic damage of 33 quasi-static test model of reinforced concrete pier by the software of ABAQUS,and the evaluation model of the cross section damage of reinforced concrete pier under dynamic load is quantified.Finally,the Support Vector Machine algorithm is used to predict the normalized parameters of the plastic strain energy density damage criterion.The accuracy and applicability of the plastic strain energy density damage criterion and the Support Vector Machine algorithm which were used to analyze the cross section damage of the reinforced concrete pier are verified by numerical examples.