三轴压缩下不同钢纤维体积分数UHPFRC的破坏准则及应力-应变本构包络面

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2025-02-09 DOI:10.1016/j.engstruct.2025.119856

Lu Ke , Bin Han , Zheng Chen , Zheng Feng , Jianan Qi , Doo-Yeol Yoo

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引用次数: 0

摘要

超高性能纤维增强混凝土（UHPFRC）在实际工程结构中经常承受三轴应力。然而，对UHPFRC在三轴压缩下的力学性能的研究却很少。不同体积分数的钢纤维对UHPFRC三轴力学性能的影响尚未得到详细的研究。对54个UHPFRC试件进行三轴压缩试验，考虑不同钢纤维体积分数（1.5 %、2.0 %、2.5 %）和围应力（0 ~ 50 MPa）。试验结果表明：对于含有钢纤维体积分数的UHPFRC试件，随着围应力从0 MPa增加到50 MPa，试件的破坏模式首先由斜剪破坏转变为剪切压缩破坏；围应力越大，峰值应力和峰值应变也越大。随着钢纤维体积分数的增加，UHPFRC的三轴抗压强度先增大后减小。讨论了八面体应力-应变关系，得到了八面体峰值剪切应力与剪切应变之间的二次函数关系。在八面体应力-应变关系的基础上，详细讨论了Mohr-Coulomb、william - warnke和Bresler-Pister三轴压缩破坏准则。Mohr-Coulomb准则对试验值的预测精度优于william - warnke和Bresler-Pister准则。然而，对于不同类型的UHPFRC，使用william - warnke和Bresler-Pister准则计算的预测值分布模式比使用Mohr-Coulomb准则计算的预测值分布模式具有更好的一致性。最后提出了UHPFRC的应力-应变本构曲线包络面。研究结果为推进不同体积分数钢纤维的UHPFRC的工程应用提供了理论依据。

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Failure criteria and stress-strain constitutive envelope surfaces for UHPFRC with different volume fractions of steel fibers under triaxial compression

Ultra-high-performance fiber-reinforced concrete (UHPFRC) often withstands triaxial stress in practical engineering structures. However, research on the mechanical properties of UHPFRC under triaxial compression is limited. The influence of different volume fractions of steel fibers on the triaxial mechanical properties of UHPFRC has not been detailly revealed. Triaxial compression tests were conducted on 54 UHPFRC specimens, and different volume fractions of steel fibers (1.5 %, 2.0 %, 2.5 %) and confining stresses (0 ∼ 50 MPa) were considered. The experimental results indicate that for UHPFRC specimens with volume fractions of steel fibers, the failure modes of all specimens first changed from oblique shear failure to shear and compression failure as the confining stress increases from 0 MPa to 50 MPa. The greater the confining stress, the greater the peak stress and peak strain. The triaxial compression strength of UHPFRC first increases and then decreases as the volume fraction of steel fibers increases. The octahedral stress-strain relationships were discussed, and a quadratic function relationship between the octahedral peak shear stress and shear strain is obtained. On the basis of the octahedral stress-strain relationships, three triaxial compression failure criteria including Mohr-Coulomb, Willam-Warnke, and Bresler-Pister criteria were carefully discussed. The prediction accuracy for the experimental values of the Mohr-Coulomb criterion is better than that of the Willam-Warnke and Bresler-Pister failure criteria. However, for different types of UHPFRC, the distribution patterns of the predicted values calculated using the Willam-Warnke and Bresler-Pister failure criteria have better consistency compared to those of the Mohr-Coulomb criterion. Finally, envelope surfaces of stress-strain constitutive curve for UHPFRC were proposed. The research results provide a theoretical basis for promoting the engineering application of UHPFRC with different with different volume fractions of steel fibers.

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来源期刊

Engineering Structures 工程技术-工程：土木

CiteScore

10.20

自引率

14.50%

发文量

1385

审稿时长

67 days

期刊介绍： Engineering Structures provides a forum for a broad blend of scientific and technical papers to reflect the evolving needs of the structural engineering and structural mechanics communities. Particularly welcome are contributions dealing with applications of structural engineering and mechanics principles in all areas of technology. The journal aspires to a broad and integrated coverage of the effects of dynamic loadings and of the modelling techniques whereby the structural response to these loadings may be computed. The scope of Engineering Structures encompasses, but is not restricted to, the following areas: infrastructure engineering; earthquake engineering; structure-fluid-soil interaction; wind engineering; fire engineering; blast engineering; structural reliability/stability; life assessment/integrity; structural health monitoring; multi-hazard engineering; structural dynamics; optimization; expert systems; experimental modelling; performance-based design; multiscale analysis; value engineering. Topics of interest include: tall buildings; innovative structures; environmentally responsive structures; bridges; stadiums; commercial and public buildings; transmission towers; television and telecommunication masts; foldable structures; cooling towers; plates and shells; suspension structures; protective structures; smart structures; nuclear reactors; dams; pressure vessels; pipelines; tunnels. Engineering Structures also publishes review articles, short communications and discussions, book reviews, and a diary on international events related to any aspect of structural engineering.