混凝土圆环构件剪切性能分析:有限元方法对比与验证

SHEAR BEHAVIOR ANALYSIS OF CONCRETE CIRCULAR HOLLOW MEMBERS: COMPARISON AND VALIDATION OF FINITE ELEMENT APPROACHES

  • 摘要: 该文围绕混凝土圆环构件的剪切性能,以文献中收集的试验结果为基准,对比了裂缝模型、钢筋混凝土粘结滑移、裂缝剪力传递和裂缝宽度计算等模型参数的影响,评估了10种非线性有限元建模方法在预测承载力和破坏状态方面的准确性。通过对不同方法的对比分析,发现旋转裂缝模型在有箍筋构件中表现出较优的预测精度,能够有效捕捉箍筋对裂缝发展的抑制作用及其抗剪机制,而对于无箍筋构件,固定裂缝模型在模拟剪切破坏时具有较好的预测精度,并结合有限元分析结果进一步总结混凝土圆环构件的抗剪机理。此外,基于损伤和骨料粒径的裂缝剪力传递模型对结果的精度和变异性有较大影响,对于钢筋混凝土粘结滑移关系建议采用fib MC2010模型。统计分析结果表明:裂缝模型在有限元建模方法中起主导作用,决定了模型的预测精度。

     

    Abstract: The accuracy of ten nonlinear finite element modeling approaches in predicting the shear behavior of concrete circular hollow members is evaluated through collected experimental results. Key modeling parameters are systematically compared, including crack models, reinforced concrete bond-slip relationships, crack shear transfer mechanisms, and crack width calculations. The comparative analysis reveals distinct performance characteristics: the rotation crack model achieves superior accuracy for members with stirrups by effectively simulating stirrup constraints on crack propagation and shear resistance mechanisms, while the fixed crack model demonstrates better performance for members without stirrups. The investigation clarifies that crack shear transfer models based on damage and on aggregate size significantly influence prediction accuracy and result variability. The fib Model Code 2010 bond-slip model is recommended as the optimal choice for simulating the bond-slip relationship. Statistical results establish crack modeling approaches as the dominant factor governing predictive accuracy in the finite element analysis.

     

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