The calibration of most analytical models that assess the shear strength of wide reinforced concrete members without shear reinforcement is based on simply supported beam tests, which may not be representative of slabs and wide members failing in shear. This paper addresses the knowledge on the shear strength of wide members, identification of their most important parameters, and an evaluation of the accuracy and precision of the main models presented in codes of practice and literature. A database of 170 shear tests was built on wide members loaded over the entire width, with the ratio width to effective depth b/d > 1. This database includes members under concentrated loads (CLs) and distributed loads (DLs) in the span direction. A parameter analysis revealed such shear strength is mostly influenced by the shear slenderness and size effect rather than by the ratio b/d. Furthermore, the results show a clear decrease in the shear strength of continuous members under DLs to higher shear slenderness, similar to the behavior of members under CLs. This trend was well observed with the proposed model of shear slenderness, which assumes that continuous members with higher bending moment in the span than over the inner support behave closer to simply supported members. A comparison of the shear capacities predicted by the physical‐mechanical and semiempirical approaches showed the higher accuracy and precision of models based on the critical shear crack theory and critical shear displacement theory, regardless of the ratio b/d. Therefore, the same models derived based on beam tests are valid for wide members. Apart from that, the analyses of nonslender members with some strain‐based models combined with reducing factors of the acting shear load provide accurate results of shear strength for members without stirrups.

中文翻译：

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不含箍筋的宽钢筋混凝土构件的单向剪切强度

大多数评估不使用抗剪钢筋的宽钢筋混凝土构件的抗剪强度的分析模型的校准都是基于简单支撑的梁测试，该测试可能无法代表平板和未通过抗剪的宽构件。本文介绍有关宽构件抗剪强度的知识，确定其最重要参数的知识，以及对实践准则和文献中提出的主要模型的准确性和精确性的评估。基于在整个宽度上加载的宽构件建立了170个剪切试验的数据库，宽度与有效深度之比b / d > 1.此数据库包括在跨度方向上承受集中荷载（CL）和分散荷载（DL）的构件。参数分析表明，这种剪切强度主要受剪切伸长率和尺寸效应的影响，而不是b / d的比值。此外，结果表明，在连续荷载作用下，连续构件的剪切强度明显降低，直至剪切伸长率更高，这与连续荷载作用下构件的行为相似。在拟议的剪切细长模型中可以很好地观察到这种趋势，该模型假定跨度比内部支撑高的连续弯矩的连续构件的性能更接近于简单支撑的构件。物理-机械和半经验方法预测的剪切能力的比较表明，无论比率b / d如何，基于临界剪切裂纹理论和临界剪切位移理论的模型都具有较高的准确性和精度。。因此，基于梁测试得出的相同模型对宽构件有效。除此之外，结合一些基于应变的模型对非细长构件进行分析，并结合作用剪力的减小因素，可以为没有箍筋的构件提供精确的抗剪强度结果。