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Finite element model and test results for punching shear failure of RC slabs
Archives of Civil and Mechanical Engineering ( IF 4.4 ) Pub Date : 2020-03-13 , DOI: 10.1007/s43452-020-00037-x
Paweł M. Lewiński , Przemysław P. Więch

The nonlinear finite element analysis of pin-supported reinforced concrete slabs of moderate thickness is the main subject of this paper. This is an important issue of the mechanics of concrete structures. Thus, a nonlinear FE analysis of RC slab models subjected to punching shear was initiated and the comparison of the numerical and test results was made. The prediction engine of the crack pattern due to bending and extension is incorporated in the Mindlin-type (moderately thick) slab model together with other nonlinear features. This is in order to formulate an alternative model of RC slab in relation to the layered models or fully three-dimensional models. New formulas were applied for 3D constitutive relationships for concrete and for tension stiffening effect. Prediction of punching shear was facilitated by Podgórski’s failure criterion for concrete. On the one hand, a considerable advantage of the proposed approach is a relatively low numerical effort in comparison with the existing models, while on the other hand the applied model clearly describes the physical behaviour of a real slab. A supporting test programme for validation was run. Three RC slabs with a system of double-headed studs as the reinforcement against punching were tested by the authors in ITB Strength Tests Laboratory. The results for the units constructed as square slabs with a central short column subjected to full-scale tests were initially compared with assessments based on standard provisions and technical approvals. As a result of this approach, the overall prediction of the nonlinear behaviour of the test model, including the model of shear failure, is in accordance with the experimental data.

中文翻译:

钢筋混凝土板冲剪破坏的有限元模型与试验结果

本文的主要研究对象是中厚混凝土销钉支撑混凝土板的非线性有限元分析。这是混凝土结构力学的重要问题。因此,开始了钢筋混凝土板模型在冲剪作用下的非线性有限元分析,并对数值和试验结果进行了比较。由于弯曲和扩展而产生的裂纹模式的预测引擎与其他非线性特征一起纳入了Mindlin型(中等厚度)平板模型中。这是为了相对于分层模型或完全三维模型制定钢筋混凝土平板的替代模型。将新公式应用于混凝土的3D本构关系和抗拉刚度效果。Podgórski的混凝土破坏准则促进了冲剪的预测。一方面,与现有模型相比,所提出方法的显着优势是相对较低的数值工作,而另一方面,所应用的模型清楚地描述了真实板坯的物理行为。运行了用于验证的支持测试程序。在ITB强度测试实验室中,作者测试了三套带有双头螺柱系统的RC板,以防止打孔。最初,将对带有中央短柱的方形平板结构进行全面测试的结果与基于标准规定和技术许可的评估进行比较。这种方法的结果是,对测试模型的非线性行为进行了整体预测,
更新日期:2020-03-13
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