钢纤维增强水泥浆液斜剪特性试验与数值研究

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-04-20 DOI:10.1016/j.engfailanal.2025.109623

Jianhang Chen , Shiji Wang , Songsong Hu , Kun Wang , Banquan Zeng , Shaokang Wu , Wenbing Fan , Zhixiang Song , Xiaohang Wan

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引用次数: 0

摘要

对斜剪作用下钢纤维增强水泥浆液的剪切性能进行了试验和数值研究。首先，通过斜剪试验，研究纤维体积分数和倾斜角度对纤维纤维混凝土抗剪特性的影响。结果表明，钢纤维的加入提高了水泥浆的抗剪强度和延性。随着纤维体积分数从0增加到1.5%，纤维纤维混凝土的抗剪强度先升高后降低。它仍然高于普通灌浆。然而，随着倾角从38°增加到60°，SFRCG的抗剪强度继续降低。钢纤维防止裂缝穿透。因此，标本没有被完全切断。当倾角为45°时，钢纤维的加入改变了破坏模式。然后，采用扫描电镜（SEM）方法对SFRCG的微观结构进行了观察。最后，根据一系列实验室测试结果进行参数校准。建立了钢筋网的三维离散元法（DEM）模型。基于应力状态与试样微裂纹演化的关系，通过DEM模拟揭示了SFRCG的剪切破坏过程和机理。数值模拟结果与室内试验结果吻合较好。并结合实验和数值结果，探讨了钢纤维在水泥基材料中的作用机理。

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Experimental and numerical investigation on inclined shear behaviour of steel fibre-reinforced cement grout

Experimental and numerical investigation were conducted on shear behaviour of steel fibre-reinforced cement grout (SFRCG) through inclined shearing. First, the influence of fibre volume fraction and tilt angle on shear characteristics of SFRCG was studied through inclined shear tests. Results indicate that adding steel fibres enhanced shear strength and ductility of cement grout. With fibre volume fraction increasing from 0 to 1.5%, shear strength of SFRCG initially increased and then decreased. It remained higher than plain grout. However, as tilt angle increased from 38° to 60°, shear strength of SFRCG continued to decrease. Steel fibres prevented cracks from penetrating. Consequently, specimens were not completely cut off. Moreover, adding steel fibres changed failure modes when tilt angle was 45°. Then, the scanning electron microscope (SEM) method was adopted to examine microstructure of SFRCG. Finally, parameter calibration was conducted based on a series of laboratory test results. Three-dimensional discrete element method (DEM) models of SFRCG were established. Shear failure process and mechanism of SFRCG were revealed based on the relationship between stress state and specimen microcrack evolution in DEM simulation. Numerical simulation results agreed well with laboratory test results. Additionally, function mechanism of steel fibres in cement-based materials was also discussed according to experimental and numerical results.

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.