Development of new punching shear reinforcement for footings

根据以往项目的研究结果，在细长和致密的基础上，冲孔力会导致不同的破坏机制。在细长的基础上，板的旋转控制着断裂的运动学，而在紧凑的基础上，冲孔锥的平移运动也决定着断裂机制。由于裂缝的形成和裂缝的几何形状，倾斜冲孔剪切加固系统似乎比垂直钢筋更有效。知识转移项目的目的是开发一个特别优化的冲剪加固系统，特别是由倾斜和垂直钢筋组成的基础。与传统的冲孔剪切增强元件相比，它易于使用，并且可以在低材料使用量的情况下提高20-25%的冲孔能力。与应用伙伴一起，进行了理论和实验研究，以开发适应细长和致密基础断裂机制的冲孔剪切加固系统，并建立了相关模型。冲压试验也用于工程模型的标定和验证。

According to the findings in the previous project, the punching force cause different failure mechanisms in slender and compact footings. While in slender footings the slab rotation controls the fracture kinematics, in compact footings a translational movement of the punching cone is also determining the fracture mechanism. Due to the crack formation and fracture geometry, an inclined punching shear reinforcement system seems to be more effective than vertical bars.The aim of the knowledge transfer project is the development of a specifically optimized punching shear reinforcement system especially for foundations consisting of inclined an vertical reinforcing bars. Compared to conventional punching shear reinforcing elements it is easy to use and leads to a 20-25% higher punching capacity with a low material usage. Along with the application partner, theoretical and experimental investigations are carried out in order to develop an adapted punching shear reinforcement system adjusted to the fracture mechanism of slender and compact footings together with an associated model. The punching tests are also employed for calibration and validation of engineering models.