非均匀受压下的箍筋约束混凝土本构模型

Hoop Reinforcement Confined Concrete Constitutive Model for Non uniformly Compression

摘要:

以Mander提出的箍筋约束混凝土模型为基础，考虑构件非均匀受压下截面应变梯度对箍筋约束效应的影响，引入偏心率系数反映非均匀受压下偏心率对箍筋有效约束力的影响，建立了一类新的箍筋约束混凝土模型.将这一模型与柔度法纤维梁柱单元相结合，实现了在计算过程中动态更新构件不同位置、不同受力状态下的截面偏心率以及相应的约束混凝土应力应变关系.对钢筋混凝土柱的分析结果表明建立的模型物理意义明确、计算精度较高.

Abstract:

Based on the confined concrete model proposed by Mander, to consider the effect of the sectional strain gradient on the confinement effect under non uniformly compression, a new confined concrete model is developed in this paper by introducing the eccentricity ratio factor to reflect the influence of the eccentricity on the confining force. Meanwhile, by combining the model with the fiber force based beam column element, it can adjust the eccentricity ratio and the corresponding stress strain relationship of the section at different locations and different loading states during calculation. The analysis of reinforced concrete columns illustrates that the model has a clear physical meaning and shown to be effective.