根据裂缝形态确定受碱-二氧化硅反应影响的 RC 构件的结构性能

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Hyo Eun Joo, Yuya Takahashi
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引用次数: 0

摘要

受碱-硅反应(ASR)影响的钢筋混凝土(RC)构件的结构性能因其多尺度现象而难以预测。最近的结构测试表明,RC 构件的性能还取决于 ASR 诱导的裂缝形态,包括局部裂缝和分散微裂缝。此外,微观因素,如凝胶体的裂缝填充和微裂缝的存在,也与此相关。为了详细探讨这一问题,我们开发了一套用于对 ASR 损坏的 RC 构件进行有限元分析的计算系统。该研究基于局部/分散裂纹模式和微观因素,对受 ASR 影响的 RC 构件的结构行为进行了数值研究。通过将分析结果与实验数据进行比较,验证了所开发计算系统的适用性。分析结果表明,具有分散微裂纹的 ASR 损坏 RC 构件表现出高度延展性,而具有局部裂纹的构件则在剪切中失效。这是因为分散的裂纹模式阻止了剪切裂纹的扩展,增强了凝胶填充裂纹的力学贡献,而局部的 ASR 裂纹则促进了临界裂纹的扩展,导致破坏,并将凝胶填充效应降至最低。通过分析研究发现,局部 ASR 裂缝会导致结构性能的显著损失;因此,本研究建议在观察到局部裂缝的情况下评估 RC 构件的结构承载能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural Performance of RC Members Affected by Alkali–silica Reaction According to Crack Patterns

The structural performance of reinforced concrete (RC) members affected by alkali–silica reaction (ASR) is difficult to predict because of the multi-scale phenomena. Recent structural tests reveal that the performance of RC members also depends on ASR-induced crack patterns, including localized cracks and dispersed microcracks. Additionally, microscopic factors, such as crack-filling by gel and presence of microcracks, are relevant. To explore this in detail, a computational system for finite element analysis of ASR-damaged RC members was developed. This study numerically investigated the structural behavior of ASR-affected RC members based on localized/dispersed crack patterns and microscopic factors. The applicability of the developed computational system was verified by comparing the analysis results with experimental data. The analysis results showed that ASR-damaged RC members with dispersed microcracks exhibited highly ductile behavior, while those with localized cracks failed in shear. This is because the dispersed crack pattern prevents the shear crack propagation and enhances the mechanical contribution of gel filling cracks, while the localized ASR cracks facilitate critical crack propagation, leading to failure, and minimize the gel-filling effect. Through the analytical investigations, it was found that the localized ASR cracks can result in significant loss of structural performance; thus, this study recommends the assessment of structural capacity of RC members in the case where the localized cracks were observed.

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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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