Flat plates are favor structure systems usually used in parking garages and high-rise buildings due to its simplicity for construction. However, flat plates have some inherent structural problems, due to high shear stress surrounding the supporting columns which cause a catastrophic brittle type of failure called "Punching Shear Failure". Several solutions are used to avoid punching shear failure, including the use of drop panels or punching shear reinforcement. The latter is being a more sophisticated solution from the structural ductility, the architectural and the economical point of view. This study aims at investigating the effect of stirrups as shear reinforcement in enhancing the punching strength of interior slab-column connections. A total of four full-scale interior slab-column connections were tested up to failure. All slabs had a side length of 1700 mm and 160 mm thickness with 200 mm x 200 mm square column. The test parameters were the presence of shear reinforcement and stirrups concentration around the supporting column. The test results showed that the distribution of stirrups over the critical punching shear zone was an efficient solution to enhance not only the punching shear capacity but also the ductility of the connection. Furthermore, the concentrating of stirrups shear reinforcement in the vicinity of the column for the tested slabs increases the punching shear capacity by 13 % compared to the uniform distribution at same amount of shear reinforcement.
展开▼
机译：平板由于其结构简单而成为通常用于停车场和高层建筑的结构系统。但是，由于支撑柱周围的高剪切应力，平板具有一些固有的结构性问题，这会导致灾难性的脆性破坏，称为“冲剪破坏”。有几种解决方案可用于避免冲切剪切破坏，包括使用下沉板或冲切剪切加固。从结构的延展性，建筑学和经济的角度来看，后者是一种更为复杂的解决方案。这项研究的目的是研究箍筋作为剪切增强在增强内部平板-柱连接的冲压强度方面的作用。总共测试了四个完整的内部平板-柱连接，直至失效。所有平板的边长为1700 mm，厚度为160 mm，柱长为200 mm x 200 mm。测试参数是在支撑柱周围是否存在抗剪钢筋和箍筋浓度。测试结果表明，箍筋在关键冲切剪切区域的分布是一种有效的解决方案，不仅可以提高冲切剪切能力，而且可以提高连接的延展性。此外，与相同剪切增强量下的均匀分布相比，箍筋剪切增强剂在被测板柱附近的浓缩使冲切剪切能力提高了13％。
展开▼
