Redistribution of shear forces in reinforced concrete members without shear reinforcement is a key aspect for the assessment of the shear capacity of wide beams and slabs. Such redistributions are due to the nonlinear response of reinforced concrete (both in bending and shear) and have the potential to significantly modify the internal forces during loading. This phenomenon allows in many cases, as for slabs linearly supported and subjected to concentrated forces, to increase the level of load even when some regions have already attained their local shear resistance. This work introduces the results of an experimental programme performed on three cantilever slabs subjected either to strip loads or to concentrated loads. Shear redistributions close to failure are investigated on the basis of refined measurements performed on the concrete surface and on the reinforcement bars. The results show the significance of several mechanical parameters, as well as how shear redistributions occur when some regions are in softening (post-peak behavior) while others have still not attained their local shear resistance. On this basis, a comprehensive approach is presented for determining the redistributions of internal forces and to predict the shear capacity of reinforced concrete slabs subjected to concentrated loads near linear supports. The performance of such approach is eventually validated against test data and practical recommendations are proposed for design and assessment.

中文翻译：

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板和宽梁的剪力重新分布和抗力

没有抗剪钢筋的钢筋混凝土构件中剪力的重新分布是评估宽梁和板的抗剪能力的一个关键方面。这种重新分布是由于钢筋混凝土的非线性响应（弯曲和剪切）造成的，并且有可能在加载过程中显着改变内力。这种现象允许在许多情况下，对于线性支撑并承受集中力的板，即使某些区域已经达到其局部抗剪强度，也可以增加载荷水平。这项工作介绍了在承受条带载荷或集中载荷的三个悬臂板上执行的实验程序的结果。在对混凝土表面和钢筋进行精确测量的基础上，研究接近破坏的剪切重新分布。结果显示了几个机械参数的重要性，以及当某些区域处于软化（峰值后行为）而其他区域仍未达到其局部抗剪强度时，剪切重新分布是如何发生的。在此基础上，提出了一种综合方法来确定内力的重新分布并预测在线性支撑附近承受集中荷载的钢筋混凝土板的抗剪能力。这种方法的性能最终会根据测试数据进行验证，并为设计和评估提出实用建议。以及当某些区域处于软化状态（峰值后行为）而其他区域仍未达到其局部抗剪强度时，剪切力重新分布是如何发生的。在此基础上，提出了一种综合方法来确定内力的重新分布并预测在线性支撑附近承受集中荷载的钢筋混凝土板的抗剪能力。这种方法的性能最终会根据测试数据进行验证，并为设计和评估提出实用建议。以及当某些区域处于软化状态（峰值后行为）而其他区域仍未达到其局部抗剪强度时，剪切力重新分布是如何发生的。在此基础上，提出了一种综合方法来确定内力的重新分布并预测在线性支撑附近承受集中荷载的钢筋混凝土板的抗剪能力。这种方法的性能最终会根据测试数据进行验证，并为设计和评估提出实用建议。提出了一种综合方法来确定内力的重新分布并预测受线性支撑附近集中荷载作用的钢筋混凝土板的抗剪能力。这种方法的性能最终会根据测试数据进行验证，并为设计和评估提出实用建议。提出了一种综合方法来确定内力的重新分布并预测受线性支撑附近集中荷载作用的钢筋混凝土板的抗剪能力。这种方法的性能最终会根据测试数据进行验证，并为设计和评估提出实用建议。