Effect of Stirrups on the Shear Failure Mechanism of Deep Beams
Effect of Stirrups on the Shear Failure Mechanism of Deep Beams
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DOI：
10.3151/jact.10.14
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发表时间：
2012-01-01
影响因子：
2
通讯作者：
Kunieda, Minoru
中科院分区：
文献类型：
--
作者：
Gedik, Yasar Hanifi;Nakamura, Hikaru;Kunieda, Minoru
本研究的目的是利用三维刚体-弹簧模型分析工具对深梁的剪切破坏机理进行解析研究，以阐明箍筋在深梁中的作用。研究深梁的内应力状态和三维变形的分析结果是本研究的主要目的。首先，通过分析结果与试验结果的对比，验证了该分析工具在深梁上的适用性。然后，研究了箍筋对深梁承载能力的贡献，分析了基于B区和D区概念的剪切破坏机理。为了实现这一点，分析了应力分布、三维变形、裂缝形态和箍筋应变等分析结果。在深梁中观察到三种形式的箍筋效应。在a/d=0.5的情况下，由于箍筋的约束作用，峰值荷载增大。在a/d=1.0的情况下，箍筋有助于支撑作用，从而导致荷载的增加。在a/d<；1.0的情况下，D区占主导地位。另一方面，在a/d>；1.5的情况下，峰值荷载随着配箍率的增加而显著增加，其中以桁架类比为主，而不是压杆作用。
The purpose of this study is to clarify the effect of stirrups in deep beams by investigating the shear failure mechanism analytically by using the 3-D Rigid-Body-Spring Model analytical tool. The investigation of the analytical results of the internal stress state and 3-D deformations of deep beams were the key objectives of this study. Firstly, the applicability of the analytical tool on deep beams was confirmed by comparison of analytical and experimental results. Then, the stirrup contribution to load carrying capacity of deep beams was investigated and the shear failure mechanism based on the B and D region concept was clarified analytically. To achieve this, analytical results such as stress distribution, 3-D deformations, crack patterns and strain of stirrups were investigated. Three types of stirrup effect were observed in deep beams. In the a/d= 0.5 case, the peak load increase due to the confinement effect of stirrups. In the a/d= 1.0 case, the stirrup contributes to the strut action that leads to an increase in load. In the case of a/d < 1.0, the D region is dominant. On the other hand, the peak load increases significantly with increases of stirrup ratio in the case of a/d > 1.5, in which the truss analogy is dominant rather than the strut action.