基于裂缝带理论的深受弯构件受剪分析

发布时间：2019-03-14 21:01

【摘要】：目前,现行各国规范和典型抗剪模型未能准确、合理考虑尺寸效应对深受弯构件受剪能力的影响。基于拉压杆模型,结合断裂力学中能量损失平衡方程和裂缝带抗剪理论,建立了深受弯构件抗剪计算模型;通过对大量钢筋混凝土深受弯构件受剪试验数据的回归分析,对模型进行简化;采用该模型对343组深受弯构件的受剪承载力进行计算,并将其预测结果及美国ACI318-14、欧洲EC2、加拿大CSA A23.3-04、我国规范(GB50010-2010)、Tan-Cheng模型计算结果与试验值进行对比分析。分析表明:基于裂缝带理论的深受弯构件抗剪模型预测结果较各国规范及Tan-Cheng模型的计算结果与试验值吻合良好,建议模型具有明确的力学概念且受剪跨比影响较小,消除了尺寸效应的影响,能够准确预测深受弯构件的抗剪能力。
[Abstract]:At present, the current national codes and typical shear models are not accurate, and the influence of size effect on shear capacity of deep bending member is considered reasonably. Based on the tension-compression bar model, combined with the balance equation of energy loss in fracture mechanics and the shear theory of fracture zone, the shear calculation model of deep bending member is established. Through regression analysis of shear test data of a large number of reinforced concrete deep flexural members, the model is simplified. This model is used to calculate the shear capacity of 343 groups of deep bending members, and the predicted results are as well as the United States ACI318-14, European EC2, CSA A23.304 Canadian CSA A23.304, China Code (GB50010-2010). The calculated results of the Tan-Cheng model are compared with the experimental values. The analysis shows that the prediction results of shear resistance model of deep bending members based on crack zone theory are in good agreement with the experimental values compared with the calculation results of national codes and Tan-Cheng models. The proposed model has a clear mechanical concept and is less affected by shear span ratio. The effect of size effect is eliminated, and the shear capacity of deep bending member can be predicted accurately.
【作者单位】：长安大学建筑工程学院;
【基金】：国家自然科学基金项目(51578072) 陕西省科技统筹创新工程计划项目(2015KTZDSF03-04) 西安市科学技术项目(CXY1512(6)) 中央高校基本业务费项目(310828163410,310828161006) 陕西省自然科学基金项目(2016JM5070)
【分类号】：TU375

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