Fatigue performance of composite concrete structure specimen (CCS) in flexure

Fatigue performance of composite concrete structure specimen (CCS) in flexure
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复合混凝土结构试件(CCS)的弯曲疲劳性能

DOI:
10.1080/15376494.2018.1484530
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发表时间:
2020-04
影响因子:
2.8
通讯作者:
Liu zhen-nan
Liu zhen-nan
中科院分区:
材料科学3区
文献类型:
--
作者:
Xu Gui-hong;Fang dong;Liu zhen-nan

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摘要 本文对复合混凝土试件(CCS)的疲劳行为进行了研究。进行实验程序是为了获得 CCS 在不同应力比下的疲劳行为。 56 个不同尺寸的 CCS 样本在四点弯曲疲劳载荷下进行了测试。为了评估CA砂浆与混凝土材料之间界面的力学性能,本研究采用了扫描电子显微镜(SEM)观察的表面分析技术。与SEM观察平行,采用BJH方法研究了CA砂浆的孔径分布。研究发现CCS与素混凝土试件的弯曲疲劳性能存在明显差异。根据材料力学理论,推导了弯曲动弹性模量的计算公式。根据试验结果、动弹性模量公式和疲劳应变分析,提出了疲劳累积损伤演化方程。
Abstract The paper presents a study on the fatigue behavior of composite concrete specimen (CCS). An experimental program was conducted to obtain the fatigue-behavior of CCS at various stress ratios. Fifty-six CCS specimens of size were tested under four-point flexural fatigue loading. To evaluate the mechanical properties of the interface between CA mortar and concrete materials, a surface analysis technique of scanning electron microscopy (SEM) observation was used in this study. Parallel with the SEM observations, the pore size distribution of CA mortar was studied by using BJH method. It is found that there exist obvious differences of flexural fatigue behavior between CCS and plain concrete specimens. According to the theory of material mechanics, the formula of dynamic elastic modulus in flexure is deduced. Based on the experimental results, the formula of dynamic elastic modulus and analysis of fatigue strain, the fatigue cumulative damage evolution equation is proposed.
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