基于纤维-骨料细观分布的自密实钢纤维混凝土单调和循环压缩性能研究

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国家科技期刊平台
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中文摘要：自密实钢纤维混凝土(SFRSCC)压缩性能表现和内部组分含量及分散状态均具有显著关联。为探究这种关联特性，定制不同组分配比的SFRSCC拌合物来浇筑制备棱柱体试块，并分别开展单调及循环压缩实验探索其压缩性能特性研究;随后截取每组试块的数个特征截面，采用粗骨料面积占比来描述粗骨料含量，将钢纤维含量及分散情况量化为Voronoi增韧面积统计值，并结合实测数据建立压缩力学特性和内部组分含量及分布特性之间的关联。参考上述关联特性，建立SFRSCC单调和循环压缩弹塑性损伤本构性能曲线方程。研究结果表明:粗骨料含量的增长提高了基体弹性模量和峰值强度，但骨料胶结难以抑制宏观裂缝的非稳定扩展;纤维数量的增加可减小钢纤维的增韧区域面积，从而能够延缓峰后塑性变形的累积，控制宏观裂缝生成，这种增韧效应和Voronoi增韧面积呈负相关，与增韧效率系数呈正相关;在自密实工艺下，钢纤维数量增加会抑制粗骨料含量的增长，需平衡Voronoi面积和粗骨料面积占比以满足增韧与增强需求。建立的SFRSCC单调和循环压缩弹塑性损伤本构性能曲线方程可实现不同组分分布下SFRSCC结构局部压缩性能的可靠分析。

外文标题：Cyclic compression performance of SFRSCC based on meso-distribution of fiber-aggregate

外文摘要：The compressive performance,component content,and dispersion state of self-compacting steel fiber reinforced concrete(SFRSCC)are significantly correlated.To investigate these correlations,SFRSCC prism specimens were prepared using mixtures with different component proportions.Monotonic and cyclic compression tests were conducted to explore the compressive performance characteristics.The coarse aggregate content was described using the percentage of coarse aggregate area,and the steel fiber content and dispersion were quantified as VORONOI toughening area statistics.The correlations between the compressive mechanical properties and the internal component content and distribution characteristics were established.Based on the aforementioned correlations,constitutive equations for the monotonic and cyclic compression elastoplastic damage behavior of SFRSCC structures were established.The results show that increasing the coarse aggregate content can improve the elastic modulus and peak strength of the matrix.Increasing the fiber dosage reduces the toughening area required by the steel fibers and delays the accumulation of post-peak plastic deformation.During the self-compacting process,increasing steel fiber dosage can suppress the increase of the coarse aggregate content,which requires a balance between the Voronoi area and the percentage of coarse aggregate area to meet the requirements of toughening and strengthening.The constitutive equations for the monotonic and cyclic compression elastoplastic damage behavior of SFRSCC structures can realize analysis of the local compressive performance of SFRSCC structures.

外文关键词：

steel fiber self-compacting concretesteel fiber distributioncoarse aggregate distributionVoronoi areacyclic compressionelastic-plastic damage

作者：

雷明锋、胡子威、刘凌晖、扎西草、李水生、杨子汉

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作者单位：

中南大学土木工程学院,湖南长沙,410075

中国建筑第五工程局有限公司,湖南长沙,410004

关键词：

钢纤维自密实混凝土钢纤维分布粗骨料分布 Voronoi面积循环受压弹塑性损伤

基金：

国家自然科学基金资助项目湖南省自然科学基金资助项目中央高校基本科研业务费专项资金资助项目中国建筑第五工程局科技研发项目

项目编号：

5197866921JJ30825502802002cscec5b-2022-26

出版年：

2024

DOI：

10.11817/j.issn.1672-7207.2024.09.014

中南大学学报(自然科学版)

中南大学

中南大学学报(自然科学版)

CSTPCD北大核心

影响因子：0.938

ISSN：1672-7207

年,卷(期)：2024.55(9)