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首页> 美国卫生研究院文献>Materials >Shear Performance of Reinforced Concrete Beams with Small Circular Openings Strengthened Using Rectangular and Octagonal-Shaped Reinforcement
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Shear Performance of Reinforced Concrete Beams with Small Circular Openings Strengthened Using Rectangular and Octagonal-Shaped Reinforcement

机译：钢筋混凝土梁采用矩形和八角形钢筋强化钢筋混凝土梁的剪切性能

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An experimental case study was carried out to investigate the shear performance of reinforced concrete beams with small circular openings under a cyclic anti-symmetric bending moment. The openings were strengthened by using a newly developed reinforcement continuously bent into rectangular and octagonal shapes, which was convenient for installation and effective for crack control. The presence of web opening reinforcement, the reinforcing method, and the web opening spacing were employed as main variables in the design of five specimens. The cyclic performance of all specimens was evaluated in terms of failure mode, crack pattern, strength and stiffness degradation, and strain distribution. Experimental results were discussed to assess the suitability of the proposed web opening reinforcement in RC web opening beams. It was confirmed that the proposed web opening reinforcement exhibited outstanding crack control and served as a shear resistance component in place of the concrete cross-section lost due to web openings. Finally, the shear strength of all specimens, obtained from the cyclic loading tests, were compared with those obtained from the equation proposed by Mansur (1998) and the Architectural Institute of Japan standard 2010.
机译：进行了实验案例研究，以研究循环反对称弯矩下具有小圆形开口的钢筋混凝土梁的剪切性能。通过使用新开发的钢筋连续弯曲成矩形和八边形形状，加强了开口，便于安装和裂缝控制有效。在五个样本的设计中，采用卷材打开增强，增强方法和卷材开口间隔。根据故障模式，裂纹图案，强度和刚度降解和应变分布，评估所有样本的循环性能。讨论了实验结果，以评估所提出的卷材卷材增强件在RC卷材开口梁中的适用性。已证实，所提出的幅材开口增强件表现出突出的裂缝控制，并用作剪切阻力分量，代替由于网开口引起的混凝土横截面。最后，将所有标本的剪切强度与循环加载试验中获得的剪切强度与来自Mansur（1998）和2010年日本标准建筑学院建筑研究所所获得的等式获得的那些。

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