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HS-SHCC弯曲疲劳变形与疲劳寿命
作者:
作者单位:

1.郑州大学 力学与安全工程学院，河南 郑州 450001;2.国网河南省电力公司经济技术研究院，河南 郑州 450052;3.郑州大学 土木工程学院，河南 郑州 450001

作者简介:

周甲佳（1984—），女，河南南阳人，郑州大学副教授，博士生导师，博士.E-mail：zhouaf@zzu.edu.cn

通讯作者:

赵 军（1971—），男，河南漯河人，郑州大学教授，博士生导师，博士.E-mail：zhaoj@zzu.edu.cn

中图分类号:

TU528.58

基金项目:

国家自然科学基金资助项目（52178257，51708510）；河南省优秀青年基金资助项目（222300420082）


Flexural Fatigue Deformation and Fatigue Life of HS-SHCC
Author:
Affiliation:

1.School of Mechanics and Safety Engineering， Zhengzhou University， Zhengzhou 450001， China;2.State Grid Henan Economic Research Institute， Zhengzhou 450052， China;3.School of Civil Engineering， Zhengzhou University， Zhengzhou 450001， China

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    摘要:

    对抗压强度为83.41 MPa的高强应变硬化水泥基复合材料（HS-SHCC）试件进行了四点弯曲疲劳试验，研究了HS-SHCC试件在不同应力水平（0.70、0.80、0.85、0.90）下的裂缝扩展、跨中挠度及疲劳寿命.结果表明：HS-SHCC试件的疲劳寿命随着应力水平的提高而不断减小；HS-SHCC试件在弯曲疲劳荷载下呈现出多裂缝开裂的特征，随着应力水平的降低，试件表面的裂缝数量减少；当应力水平为0.70~0.85时，HS-SHCC试件的跨中挠度呈现出明显的快速发展、稳定发展、失稳三阶段，而当应力水平为0.90时，HS-SHCC试件的跨中挠度则表现出稳定发展和失稳两阶段特性；与普通SHCC相同，HS-SHCC试件的应力水平-疲劳寿命（λ-Nf）曲线呈现出双线性趋势.基于λ-Nf曲线和三参数Weibull分布理论，提出各失效概率下HS-SHCC的弯曲疲劳寿命预测模型，得出失效概率为0.05时HS-SHCC的疲劳强度极限（疲劳循环200万次）对应的最大应力水平为0.618.

    Abstract:

    Four-point bending fatigue tests were carried out on high strength strain hardening cementitious composite（HS-SHCC） specimens with compressive strength of 83.41 MPa. The crack propagation， mid-span deflection and fatigue life of HS-SHCC specimens at different stress levels （0.70、0.80、0.85、0.90） were studied. The results show that the fatigue life of HS-SHCC specimens decreases with the increase of stress level. The HS-SHCC specimens show multi-cracking characteristic under flexural fatigue loads. As the stress level decreases， the crack numbers on the surface of the specimens show a decreased trend. At the stress level 0.70-0.85， the mid-span deflection of HS-SHCC displays obvious three stages of rapid development， stable development and instability. At the stress level 0.90， the mid-span deflection of HS-SHCC specimens shows two stages of stable development and instability. Similar to ordinary SHCC， the stress level-fatigue life curves （λ-Nf curve） of HS-SHCC specimens show a bilinear trend. Based on the obtained λ-Nf curve and the three-parameter Weibull distribution theory， a flexural fatigue life prediction model of HS-SHCC under different failure probabilities is proposed. On this basis， the maximum stress level corresponding to the fatigue strength limit （corresponding to 2 million fatigue cycles） of HS-SHCC is predicted to be 0.618 when the failure probability is 0.05.

    图1 HS-SHCC试件的制备过程Fig.1 Preparation process of HS-SHCC specimen
    图2 疲劳加载示意图Fig.2 Fatigue loading diagram（size：mm）
    图3 疲劳加载曲线Fig.3 Fatigue loading curve
    图4 静力荷载下HS-SHCC试件的荷载-跨中挠度曲线Fig.4 Load-mid-span deflection curves of HS-SHCC specimens under static load
    图5 HS-SHCC试件底部纯弯段的裂缝图Fig.5 Cracks in pure bending section at the bottom of HS-SHCC specimens
    图6 应力水平为0.85时HS-SHCC试件侧面纯弯段的应变场分布Fig.6 Strain field distribution in pure bending section on the side of HS-SHCC specimens at stress level of 0.85
    图7 各应力水平下HS-SHCC试件最大跨中挠度与疲劳系数之间的关系Fig.7 Relationship between the maximum mid-span deflection and fatigue coefficient of HS-SHCC specimens under different stress levels
    图8 HS-SHCC、普通SHCC和混凝土的λ-Nf曲线Fig.8 λ-Nf curves for HS-SHCC，ordinary SHCC and ordinary concrete
    图9 三参数Weibull分布检验拟合结果Fig.9 Three-parameter Weibull distribution test fitting results
    图10 不同失效概率的λ-Nf模型预测结果Fig.10 Prediction results by λ-Nf model with different failure probabilities
    表 1 HS-SHCC试件的配合比Table 1 Mix proportion（by mass） of HS-SHCC specimens
    表 2 不同应力水平下的裂缝数量Table 2 Crack numbers under different stress levels
    表 3 各应力水平下HS-SHCC试件的疲劳寿命Table 3 Fatigue life of HS-SHCC specimens at different stress levels
    表 4 HS-SHCC试件疲劳寿命的三参数Weibull分布模型的参数Table 4 Parameters of three-parameter Weibull distribution for fatigue life of HS-SHCC specimens
    表 5 不同失效概率下HS-SHCC的等效疲劳寿命Table 5 Equivalent fatigue life of HS-SHCC under different failure probabilities
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周甲佳,董泽华,陈本发,景川,赵军.HS-SHCC弯曲疲劳变形与疲劳寿命[J].建筑材料学报,2025,28(3):193-201

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  • 收稿日期:2024-04-08
  • 最后修改日期:2024-08-22
  • 在线发布日期: 2025-04-06
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