Development of an enhanced damage law for typical steel fiber reinforced concrete based on uniaxial compression and tension tests

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Sören Faustmann, Andreas Wolf, Oliver Fischer
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Abstract

Understanding the stiffness of a concrete structure is crucial to analyze it, particularly for statically indeterminate structures. Stiffness degradation – commonly referred to as damage – occurs with the onset of cracking or large compressive strains. For most conventional and specialized types of concrete, damage studies and models for predicting damage development are available. However, more information is needed about the damage behavior for the most common steel fiber reinforced concrete in Europe with strength class C30/37 and modern end-anchored high-strength fibers in dosages of 20–40 kg/m3. Therefore, in this study, these common steel fiber concretes were subjected to multiple load cycles in (1) uniaxial compression tests on cylinders and (2) direct tensile tests on bone specimens to investigate their damage behavior. The resulting damage was then compared to known damage laws, but none of the models predicted accurate damage results. Finally, an existing damage law for plain concrete was modified as a function of the residual flexural tensile strength—the relevant parameter for describing the performance of the steel fiber reinforced concrete. Hereby, we were able to decisively improve the agreement between experimental results and the theoretical prognosis by utilizing our modified damage law.

Abstract Image

基于单轴压缩和拉伸试验,开发典型钢纤维增强混凝土的增强破坏规律
了解混凝土结构的刚度对于分析至关重要,尤其是对于静力不确定结构。刚度退化(通常称为破坏)会随着开裂或大的压缩应变的出现而发生。对于大多数传统和特殊类型的混凝土,都有用于预测损伤发展的损伤研究和模型。然而,对于欧洲最常见的钢纤维增强混凝土(强度等级为 C30/37,现代末端锚固高强度纤维的用量为 20-40 kg/m3)的破坏行为,还需要更多信息。因此,在本研究中,这些常见的钢纤维混凝土在(1)圆柱体单轴压缩试验和(2)骨质试样直接拉伸试验中经受了多次加载循环,以研究其破坏行为。然后将得出的破坏结果与已知的破坏规律进行比较,但没有一个模型能预测出准确的破坏结果。最后,我们修改了现有的素混凝土损伤规律,将其作为残余抗弯拉强度的函数--残余抗弯拉强度是描述钢纤维增强混凝土性能的相关参数。因此,我们利用修改后的破坏规律,决定性地提高了实验结果与理论预测之间的一致性。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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