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Shear Tests on RC Beams without Stirrups under Uniformly Distributed Load

机译：均布荷载下无箍筋的RC梁的抗剪试验

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Despite hundreds of theoretical and experimental investigations carried out over the past decades, still no generally accepted, mechanically based model for the shear behaviour of structural concrete members without transverse reinforcement exists. The available theoretical models rely on limited experimental substantiation since the vast majority of the tests to date have been conducted on small, simply supported beams under point loads, which do not appropriately reflect real structures. Nevertheless, code provisions for shear design in structural concrete based on these theoretical models are used for the design of large structures under complex loading conditions. A comparison of experimental results with theoretical models concerning the shear strength of RC members without transverse reinforcement indeed reveals discrepancies between experimental and theoretical failure loads, and a lack of experimental data particularly for large specimens under distributed load. Therefore, two large-scale shear tests on simply supported, uniformly loaded beams without stirrups have been conducted to extend the experimental basis. This paper presents the results of these two experiments and compares them with various theoretical models and code provisions for shear in structural concrete. The failure loads evaluated with the theoretical models are in good accordance with the experimental results - they are within a range of 20 % - but at the same time not conservative. The shear strengths determined from code provisions showed a rather big scatter and partially exceeded the experimental failure loads as well.
机译：尽管在过去的几十年中进行了数百次理论和实验研究，但仍不存在普遍接受的基于机械的无横向钢筋结构混凝土构件的剪切性能模型。可用的理论模型依赖有限的实验依据，因为迄今为止，绝大多数测试都是在点载荷下在简单支撑的小型梁上进行的，无法适当地反映真实结构。然而，基于这些理论模型的结构混凝土剪力设计规范被用于复杂荷载条件下的大型结构设计。将实验结果与关于无横向钢筋的RC构件的抗剪强度的理论模型进行比较，确实揭示了实验破坏力与理论破坏力之间的差异，并且缺乏实验数据，特别是对于分散载荷下的大型试样。因此，已经对简单支撑的，无箍筋的均布荷载梁进行了两次大规模剪切试验，以扩展实验基础。本文介绍了这两个实验的结果，并将它们与结构混凝土的各种理论模型和剪切规范进行了比较。用理论模型评估的破坏载荷与实验结果非常吻合-在20％的范围内-但同时也不是保守的。由规范规定确定的抗剪强度显示出较大的分散性，并且还部分超过了实验破坏载荷。

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