Experimental investigation on friction between foundation slabs and substructure

The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019) Pub Date : 2019-12-03 DOI:10.3846/mbmst.2019.143

K. Holschemacher, P. Löber

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Abstract

For verification of structural safety (ultimate limit states – ULS) and serviceability (serviceability limit states – SLS) of reinforced concrete structures direct and indirect actions must be considered. The main reason for unexpected wide cracks in foundation slabs is restraint due to development and discharge of hydration heat, shrinkage and climatic actions. The amount of restraint is dependent on friction forces between the lower side of the foundation slab and the substructure. Friction coefficient is influenced by the properties of the sliding layer that is in many cases provided by two layers of PE foil. In various normative regulations and design recommendations there are proposals for mean values of friction coefficients in the context of design of foundation slabs. Because these friction coefficients strongly differ even for comparable sliding layers an experimental investigation has been carried out aiming on better understanding of the friction behavior between foundation slabs and substructure. The paper describes the test program and reports the investigated friction coefficients.

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基础板与下部结构摩擦力试验研究

为了验证钢筋混凝土结构的安全性(极限状态- ULS)和适用性(使用极限状态- SLS)，必须考虑直接和间接的作用。基础板出现超宽裂缝的主要原因是水化热的发展和释放、收缩和气候作用的约束。约束的大小取决于底板下侧与下部结构之间的摩擦力。摩擦系数受滑动层性质的影响，在许多情况下，滑动层是由两层PE箔提供的。在各种规范规定和设计建议中，对基础板设计中摩擦系数的平均值提出了建议。由于这些摩擦系数即使在可比较的滑动层之间也存在很大差异，因此进行了旨在更好地理解基础板与下部结构之间摩擦行为的实验研究。本文叙述了试验程序，并报告了所测摩擦系数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The proceedings of the 13th international conference "Modern Building Materials, Structures and Techniques" (MBMST 2019)

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