Reinforced concrete ribbed slabs with wide-beam

Abstract Ribbed slabs have been widely used in buildings due to their many advantages, especially the decrease of concrete below the neutral line. This paper presents an experimental and computational study on ribbed slabs with wide-beam, two one-way slabs and two two-way slabs, with variable depths were tested to evaluate their resistance to punching and shear strength of slabs. Experimental and computational results showed that the wide-beam ribs connection is a critical point in the design of the slabs due to the difference in stiffness in the transition zone. Best results for the ultimate load estimates for ribs were provided by EC 2 (2004), while estimates of ACI 318 (2008) and NBR 6118 (2014) were respectively conservative and unsafe. Test results on slabs also revealed that the Brazilian alternative to analysis ribbed slabs as solid ones failed to give satisfactory results.

摘要 带肋楼板（ribbed slabs）因诸多优势已在建筑工程中得到广泛应用，尤其可大幅降低中性轴下方的混凝土用量。本文针对宽梁式带肋楼板开展试验与数值计算研究：共测试2块单向带肋楼板与2块双向带肋楼板，各试件的肋高可变，以评估其抗冲切性能与楼板抗剪强度。试验与计算结果表明，由于过渡区域的刚度差异，宽梁肋节点是带肋楼板设计中的关键控制点。针对肋板极限荷载的预测，欧洲规范EC 2 (2004) 给出了最优结果；而美国混凝土协会规范ACI 318 (2008) 与巴西国家规范NBR 6118 (2014) 的预测结果则分别偏于保守与偏于不安全。楼板试验结果同时显示，将带肋楼板等效为实心楼板进行分析的巴西替代分析方法，无法获得令人满意的计算结果。