一种基于预应力试件表征混凝土抗剪强度的新实验方法

IF 1.8 3区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strain Pub Date : 2022-01-30 DOI:10.1111/str.12407

P. Forquin, R. Abdul‐Rahman, D. Saletti

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引用次数: 1

摘要

本文描述了一种新的基于预应力试样的混凝土或岩石类材料的限剪强度表征实验方法。这种方法被称为PS‐PTS (Pre - Stressed Punch - Through - Shear)，采用金属约束单元，首先进行准静态变形，因此混凝土样品可以在单元颚之间引入。在卸载阶段，约束力传递给试样。结果表明，这种初始预载荷水平可以用弹性闭合解来预测。粘在电池上的应变片允许在预应力阶段和剪切阶段实验测量施加到样品上的约束水平。在下一阶段，通过液压机对样品的中心部分施加向侧向部分的微分位移，从而可以推断出被测材料的约束抗剪强度。在约束应力和剪切强度方面，将结果与先前使用“尺寸测量”约束单元获得的数据进行了比较。

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A novel experimental method to characterise the shear strength of concrete based on pre‐stressed samples

The present paper describes a novel experimental method for characterising the confined shear strength of concrete or rock‐like materials based on the use of pre‐stressed sample. This method, called PS‐PTS (Pre‐Stressed Punch‐Through‐Shear), employs a metallic confinement cell that is first quasi‐statically deformed so the concrete sample can be introduced in between the cell jaws. The confinement force is transmitted to the sample in the unloading stage. It is shown that this initial pre‐load level can be predicted by an elastic closed‐form solution. Strain‐gauges glued on the cell allow the confinement level applied to the sample to be experimentally measured during the pre‐stressing stage and the shear stage. In the next stage, the central part of the sample is subjected to a differential displacement towards the lateral parts by means of a hydraulic press so the confined shear strength of the tested material can be deduced. The results are compared to the data previously obtained with an “oedometric” confinement cell in terms of confinement stresses and shear strength.

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来源期刊

Strain 工程技术-材料科学：表征与测试

CiteScore

4.10

自引率

4.80%

发文量

期刊介绍： Strain is an international journal that contains contributions from leading-edge research on the measurement of the mechanical behaviour of structures and systems. Strain only accepts contributions with sufficient novelty in the design, implementation, and/or validation of experimental methodologies to characterize materials, structures, and systems; i.e. contributions that are limited to the application of established methodologies are outside of the scope of the journal. The journal includes papers from all engineering disciplines that deal with material behaviour and degradation under load, structural design and measurement techniques. Although the thrust of the journal is experimental, numerical simulations and validation are included in the coverage. Strain welcomes papers that deal with novel work in the following areas: experimental techniques non-destructive evaluation techniques numerical analysis, simulation and validation residual stress measurement techniques design of composite structures and components impact behaviour of materials and structures signal and image processing transducer and sensor design structural health monitoring biomechanics extreme environment micro- and nano-scale testing method.