Applications of Critical Shear Crack Theory to Punching of Reinforced Concrete Slabs with Transverse Reinforcement
Applications of Critical Shear Crack Theory to Punching of Reinforced Concrete Slabs with Transverse Reinforcement
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DOI：
10.14359/56614
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发表时间：
2009-07
影响因子：
1.8
通讯作者：
M. F. Ruiz;A. Muttoni
中科院分区：
文献类型：
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作者：
M. F. Ruiz;A. Muttoni
估计受剪钢筋平板冲孔强度的传统方法是基于这样的假设，即混凝土在极限时承受一小部分施加的荷载，而其余的荷载由受剪钢筋承担。混凝土的贡献通常被估计为没有抗剪钢筋的构件的冲孔强度的一部分。有剪力钢筋和没有剪力钢筋的构件的混凝土贡献之比通常假设为恒定，与剪力钢筋的数量、受弯钢筋比和剪力钢筋的粘结条件无关。本文讨论了这种方法的局限性，并提出了一种基于临界剪切裂纹理论的新理论模型来研究受剪加筋板的强度和延性。建议的方法基于物理模型，克服了当前业务守则的大多数限制。本文还详细介绍了该方法在各种冲剪配筋体系中的应用，并将其结果与现有试验数据进行了比较。
The traditional approach of codes of practice for estimating the punching strength of shear-reinforced flat slabs is based on the assumption that concrete carries a fraction of the applied load at ultimate while the rest of the load is carried by the shear reinforcement. Concrete contribution is usually estimated as a fraction of the punching strength of members without shear reinforcement. The ratio between the concrete contribution for members with and without shear reinforcement is usually assumed constant, independent of the amount of shear reinforcement, flexural reinforcement ratio, and bond conditions of the shear reinforcement. The limitations of such an approach are discussed in this paper and a new theoretical model, based on the critical shear crack theory, is presented to investigate the strength and ductility of shear-reinforced slabs. The proposed approach is based on a physical model and overcomes most limitations of current codes of practice. Its application to various punching shear reinforcement systems is also detailed in the paper and its results are compared to available test data.