Punching shear in reinforced concrete slabs supported on walls and long columns.

混凝土平板冲切破坏具有脆性和灾难性，合理的冲切设计和加固对结构的安全性和鲁棒性至关重要。典型的冲切已被研究的柱上的平板之间的转换单向梁剪切和双向冲切明确界定。然而，当板支撑在长墙上时，墙的端部也受到双向剪切，从而产生冲切问题。长墙端部的冲切在实务守则中没有具体说明。Blackwell结构工程师经常遇到这些类型的连接，缺乏明确的指导方针导致设计过程耗时。分析结果准确性的不确定性也可能导致不安全的结构，因为尚未对该主题进行合理和全面的研究。

Proper design and reinforcing for punching shear of flat concrete slabs is essential for safety and robustness of structures because punching shear failures are brittle and catastrophic. Typically punching shear has been investigated for flat slab on columns where the transition between one-way beam shear and two-way punching shear is clearly defined. However, when the slab is supported on a long wall, the end of the wall is also subject to two-way shear creating punching shear issue. Punching shear at the ends of long walls is not specifically addressed in the codes of practice. Blackwell Structural Engineers routinely encounter these types of connections and the lack of clear guidelines results in a time-consuming design process. Uncertainty in the accuracy of analysis results could also potentially result in unsafe structures since no rational and comprehensive research on the topic has been done.