Flexural behavior of steel fiber-reinforced geopolymer lightweight aggregate concrete beams

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures Pub Date : 2025-09-29 DOI:10.1016/j.engstruct.2025.121442

Xi Liu, Zhen-jun Li, Ming-xing Jiang, Hui Wang, Tian-hao Wu

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引用次数: 0

Abstract

Eight hooked-end steel fiber-reinforced geopolymer lightweight aggregate concrete (SFGLAC) beams were tested to investigate failure modes, cracking behavior, and moment-deflection response. The fractal theory was employed to quantitatively analyze the variation in crack patterns and propagation behavior, thereby establishing the relationship between crack fractal dimension and flexural properties. To further capture the nonlinear stress–strain behavior of concrete, a novel dynamic gradient-optimized layered (DGOL) method was developed, enabling detailed cross-sectional stress analysis. Experimental results demonstrated that SFGLAC beams exhibited favorable crack distribution, characterized by narrow and densely spaced cracks that formed interconnected networks with multiple branching patterns. Quantitative fractal analysis demonstrated that the surface crack patterns exhibited distinct fractal characteristics, with the crack fractal dimension showing strong statistical correlations with both residual flexural capacity and flexural stiffness degradation. Additionally, Comparative assessments with existing design standards further indicated that both Chinese and American codes provide conservative predictions of the ultimate moment capacity of hooked-end fiber-reinforced GLAC beams. The proposed DGOL-based ultimate moment model demonstrated superior predictive accuracy with minimal dispersion, as evidenced by a coefficient of variation below 2 %.

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钢纤维增强地聚合物轻骨料混凝土梁的受弯性能

八个钩端钢纤维增强地聚合物轻骨料混凝土（SFGLAC）梁进行了测试，以研究破坏模式，开裂行为和弯矩-挠度响应。利用分形理论定量分析了裂纹形态和扩展行为的变化，建立了裂纹分形维数与弯曲性能的关系。为了进一步捕捉混凝土的非线性应力-应变行为，开发了一种新的动态梯度优化分层（DGOL）方法，可以进行详细的横截面应力分析。实验结果表明，SFGLAC梁具有良好的裂缝分布特征，裂缝狭窄且密集分布，形成具有多种分支模式的互连网络。定量分形分析表明，表面裂纹形态具有明显的分形特征，裂纹分形维数与残余抗弯承载力和抗弯刚度退化均具有较强的统计相关性。此外，与现有设计标准的比较评估进一步表明，中国和美国的规范对钩端纤维增强GLAC梁的极限弯矩承载力提供了保守的预测。所提出的基于dgo的极限弯矩模型具有卓越的预测精度和最小的分散，变异系数低于2 %。

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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.