锈蚀钢筋混凝土梁动态抗弯性能细观数值研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (9) : 77-85.

论文

张仁波1,2，杨鸿申1，金浏1，邓小芳1，杜修力1

作者信息 +

Meso numerical study on dynamic anti-bending performance of corroded RC beam

ZHANG Renbo1,2, YANG Hongshen1, JIN Liu1, DENG Xiaofang1, DU Xiuli1

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文章历史 +

摘要

为研究锈蚀对钢筋混凝土(RC)梁动态力学性能的影响，考虑钢筋锈蚀和应变率效应及混凝土内部结构的非均质性，建立锈蚀钢筋混凝土梁两阶段三维细观尺度数值模型。钢筋的非均匀锈蚀膨胀以施加非均匀径向位移的方式模拟，并以保护层开裂“最终状态”作为之后混凝土梁动载模拟的“初始输入条件”，获得锈蚀后的动态力学行为。在验证了数值模型合理性的基础上，分析了钢筋锈蚀引起的保护层锈胀开裂行为及不同应变率下构件力学性能的变化。结果表明：钢筋锈蚀使混凝土梁产生了明显的纵向裂缝，梁的承载力随钢筋锈蚀率增加而降低。高应变率下，混凝土梁发生冲切破坏，梁的承载力显著提高。锈蚀混凝土梁承载力损失与锈蚀后梁频率降低系数(反映刚度损失)近似呈线性规律，且低应变率下的承载力对频率变化更加敏感。最后，基于模拟结果回归分析，发展建立了考虑锈蚀及应变率耦合影响的混凝土梁动态抗弯承载力预测公式。

Abstract

In order to explore the corrosion effects on the dynamic behavior of reinforced concrete (RC) beams, a two-stage three-dimensional mesoscale numerical model considering rebar corrosion, strain rate effects and the heterogeneity of concrete materials was established. The non-uniform radial displacement was applied to concrete around the rebar to simulate the expansion of the corrosion products, and the “final state” of concrete cover is taken as the “initial input condition” for the dynamic loading simulation，so as to obtain the dynamic flexural behavior of the corroded RC beams. After verifying the rationality of the numerical model, the cracking behavior of the cover and the mechanical performance of corroded RC beams subjected to dynamic loading with different strain rates were analyzed. The results indicate that rebar corrosion causes the longitudinal cracks on protective layer and the reduction of the bearing capacity. The punching-shear failure occurs and the bearing capacity is also significantly improved for the beams under high strain rate. The loss of bearing capacity is approximately linear with the reduction of frequency (stiffness loss) of corroded beams, and the bearing capacity of beams under low strain rate is more sensitive to the variation of frequency. Finally, based on the regression analysis of the data, a prediction formula was developed for the dynamic flexural capacity of RC beams considering the coupling effects of corrosion and strain rates.

导出引用

张仁波1,2，杨鸿申1，金浏1，邓小芳1，杜修力1. 锈蚀钢筋混凝土梁动态抗弯性能细观数值研究[J]. 振动与冲击, 2023, 42(9): 77-85

ZHANG Renbo1,2, YANG Hongshen1, JIN Liu1, DENG Xiaofang1, DU Xiuli1. Meso numerical study on dynamic anti-bending performance of corroded RC beam[J]. Journal of Vibration and Shock, 2023, 42(9): 77-85

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