箍筋约束混凝土本构模型对比研究及其在数值分析中的应用
Comparative Study of Constitutive Models for Stirrup-Confined Concrete and Their Application in Numerical Analysis
本文系统梳理并对比了不同箍筋约束混凝土本构模型在混凝土轴压峰值应力、峰值应变及应力-应变曲线形状预测方面的表现。基于大量混凝土多轴试验数据与钢筋混凝土轴心受压试验数据,采用平均相对误差和均方根误差等指标,对Mander、钱稼茹等学者提出的模型进行了定量评估,分析了各模型在不同围压水平、配箍特征值及箍筋间距条件下的适用性与局限性。进一步结合ABAQUS混凝土塑性损伤模型,探讨了约束混凝土本构在三维实体单元数值分析中的合理引入方式,并提出一种基于峰值应力修正的约束混凝土本构参数输入方法。通过轴压与水平推覆数值分析算例验证表明,基于峰值应力修正的约束混凝土本构相较于未经修正的约束混凝土本构有效改善了峰值承载力高估现象,同时相较于素混凝土本构弥补了在峰值应变与延性模拟方面的不足,为钢筋混凝土构件抗震性能分析提供了一种更为合理的本构建模思路。
This paper systematically reviews and compares the performance of different constitutive models for stirrup-confined concrete in predicting the axial compressive peak stress, peak strain, and the overall stress-strain curve of concrete.Based on a large body of experimental data from multiaxial concrete tests and axial compression tests of reinforced concrete members, quantitative evaluations of representative models proposed by researchers such as Mander and Qian Jiaru are conducted using metrics including the mean relative error and the root mean square error.The applicability and limitations of these models under varying levels of lateral confinement pressure, transverse reinforcement characteristic values, and stirrup spacing are analyzed.Furthermore, in conjunction with the concrete damaged plasticity (CDP) model in ABAQUS, the study investigates rational approaches for incorporating confined concrete constitutive relationships into three-dimensional solid-element numerical analyses, and proposes a parameter input method for confined concrete constitutive models based on peak stress correction.Numerical examples involving axial compression and lateral pushover analyses demonstrate that, compared with unmodified confined concrete constitutive models, the proposed peak-stress-corrected model effectively mitigates the overestimation of peak load capacity, while also compensating for the deficiencies of unconfined concrete models in simulating peak strain and ductility.The proposed approach provides a more rational constitutive modeling strategy for the seismic performance analysis of reinforced concrete members.
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