Quantitative evaluation of the effects of shear reinforcement in flat-plate structure

为了研究钢筋混凝土板的冲切强度，进行了两种类型的试件：有缝试件和无缝试件。在试件中，仅利用混凝土板的抗扭能力来抵抗弯矩。试验结果表明，日本标准中所采用的最大剪应力是合理的。然而，无缝隙试件的抗扭面积比日本标准中假定的要大。根据试验结果，提出了混凝土板冲切强度的评定方法。

To investigate punching shear strength of reinforced concrete slab, two types of specimens are tested: specimens with/without slits. In a specimen, slits are used so as to resist bending moment only by the torsional resistance of concrete slab. The test result shows that the maximum shear stress used in the Japanese standard is appropriate. However, a specimen without slits show that the area resisting torsion is larger than that assumed in the Japanese standard. Based on the test results, a method to evaluate the punching shear strength of concrete slab is proposed.