Abstract The shear behaviour of concrete members has been long investigated; however, there is still no consensus on a single design approach. Shear failures are generally brittle, hence highly undesired. Failure modes are traditionally classified into one-way and two-way (punching) shear. Nevertheless, in concrete slabs intermediate cases are observed when a concentrated load is located close to the supports. These cases are not considered in most codes of practice, despite some investigative efforts conducted in recent years. Furthermore, knowledge about the shear behaviour of skew slabs is still limited. This paper reviews the shear design provisions of main codes of practice, as well as relevant research on concrete slabs subjected to concentrated loads close to supports. Procedures for extending the code provisions to the design of skew slabs are proposed. These are illustrated and validated through the case studies of two skew railway decks, one simply-supported and the other continuous. Some scatter is found across different codes of practice, broadly reflecting their predominant parameters. The procedures are also compared to the limited experiments on skew slabs available in the literature. It is found that the predicted shear strengths are considerably smaller than the experimental values. Unexpectedly, the experiments highlighted a modest influence of the reinforcement grid orientation, which confirms that the mechanisms underlying shear design in slabs still need to be fully understood.

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直斜混凝土板剪切设计方法的比较研究

摘要 混凝土构件的抗剪性能长期以来一直被研究。然而，对于单一的设计方法仍然没有达成共识。剪切破坏通常很脆，因此非常不受欢迎。失效模式传统上分为单向和双向（冲切）剪切。然而，在混凝土板中，当集中荷载靠近支撑时，会观察到中间情况。尽管近年来进行了一些调查工作，但大多数行为守则并未考虑这些案件。此外，关于斜板的剪切行为的知识仍然有限。本文回顾了主要实践规范的剪力设计规定，以及对靠近支座承受集中荷载的混凝土板的相关研究。提出了将规范条款扩展到斜板设计的程序。这些通过两个倾斜铁路桥面的案例研究得到了说明和验证，一个是简支的，另一个是连续的。在不同的实践准则中发现了一些分散情况，广泛地反映了它们的主要参数。该程序还与文献中可用的斜板的有限实验进行了比较。发现预测的剪切强度比实验值小得多。出乎意料的是，实验强调了钢筋网格方向的适度影响，这证实了仍然需要充分了解板中剪切设计的机制。一个是简支的，另一个是连续的。在不同的实践准则中发现了一些分散情况，广泛地反映了它们的主要参数。该程序还与文献中可用的斜板的有限实验进行了比较。发现预测的剪切强度比实验值小得多。出乎意料的是，实验强调了钢筋网格方向的适度影响，这证实了仍然需要充分了解板中剪切设计的机制。一个是简支的，另一个是连续的。在不同的实践准则中发现了一些分散情况，广泛地反映了它们的主要参数。该程序还与文献中可用的斜板的有限实验进行了比较。发现预测的剪切强度比实验值小得多。出乎意料的是，实验强调了钢筋网格方向的适度影响，这证实了仍然需要充分了解板中剪切设计的机制。发现预测的剪切强度比实验值小得多。出乎意料的是，实验强调了钢筋网格方向的适度影响，这证实了仍然需要充分了解板中剪切设计的机制。发现预测的剪切强度比实验值小得多。出乎意料的是，实验强调了钢筋网格方向的适度影响，这证实了仍然需要充分了解板中剪切设计的机制。