考虑骨料体积含量影响的混凝土准脆性断裂预测模型及应用

徐平; 胡晓智; 张敏霞; 马金一

doi:10.6052/j.issn.1000-4750.2017.08.0599

考虑骨料体积含量影响的混凝土准脆性断裂预测模型及应用

1.
河南理工大学土木工程学院, 河南, 焦作 454003;
2.
西澳大学机械与化学工程学院, 澳大利亚, 珀斯 WA6009

基金项目: 国家自然科学基金项目（U1404527，51508166）；河南省交通厅科技项目（2016Y2-1）；河南省博士后基金项目（169440）

详细信息

作者简介:
徐平(1981-),男,湖南人,副教授,博士,博士后,从事高性能混凝土及工程力学方面研究(E-mail:hpuxuping@126.com);张敏霞(1979-),女,河南人,副教授,博士,从事建筑材料与基础工程方面的研究(E-mail:zhangminxia@126.com);马金一(1993-),男,河南人,硕士生,从事高性能混凝土及结构工程方面的研究(E-mail:majinyi1007@126.com).

通讯作者:
胡晓智(1957-),男,澳大利亚人,终身教授,博士,博导,从事断裂力学和先进材料与应用研究(E-mail:xhu@mech.uwa.edu.au).

中图分类号: TU528.1;O346.1+1
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出版历程
- 收稿日期: 2017-08-01
- 修回日期: 2018-04-03
- 刊出日期: 2018-10-28

QUASI-BRITTLE FRACTURE MODEL AND APPLICATION ON CONCRETE CONSIDERING AGGREGATE VOLUME CONTENT EFFECT

1.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China;
2.
School of Mechanical and Chemical Engineering, University of Western Australia, Perth Australia, WA6009

摘要

摘要: 基于对准脆性断裂边界影响模型参数的分析，该文将平均骨料粒径d_ave引入模型中，得到了考虑骨料体积含量及尺寸影响的混凝土准脆性断裂预测模型。模型中的有效裂缝与特征裂纹的比值，明确表征了三分点加载单边切口梁(SENB)试件的尺寸及初始缝长度变化时服从的断裂失效准则；模型中d_ave及分散系数β_ave将影响最大荷载P_max作用下临界微裂纹扩展区的平均虚拟裂纹长度Δa_fic。通过SENB试件在P_max时的受力分析，得到了临界正应力σ_n、有效裂缝长度a_e、拉伸强度f_t及断裂韧度K_IC之间的关系式。通过Amparano的试验结果，当a_fic为0.8~1.4倍d_ave时，采用混凝土准脆性断裂模型能较好预测混凝土拉伸强度及断裂韧度。通过对Δa_fic=1.2d_ave时模型得到的预测曲线与试验结果的对比，证明了模型计算结果的可靠性。考虑骨料体积含量影响的混凝土准脆性断裂模型能基于RILEM规范中三分点加载SENB试验预测混凝土断裂韧度与拉伸强度。
- 边界影响模型 /
- 准脆性断裂 /
- 混凝土骨料 /
- 断裂韧度 /
- 拉伸强度
Abstract: Based on the analysis of parameters in a Boundary Effect Model, the average aggregate size d_ave has been introduced into the model. Whereafter, the quasi-brittle fracture prediction model on concrete considering aggregate volume content and size effect has been proposed. The ratio of effective notch length to characteristic crack length in this model can clarify the fracture failure criterion of the specimens as the variation of the dimension and initial notch length for single edge notched beams (SENB) in three-point-bending tests. The fictitious crack length in critical crack growth region at P_max will be determined by the d_ave and dispersion coefficient β_ave in this model. Based on the stress analysis of the SENB at P_max, the relationship between critical nominal strength σ_n and effective notch length ae and tensile strength f_t and fracture toughness K_IC has been obtained. According to the experiment results performed by Amparano, the tensile strength and fracture toughness could be predicted well by the fracture model with the average fictitious crack length Δa_fic=(0.8~1.4)d_ave. The reliability and applicability of the fracture model proposed have been confirmed by the comparison of the prediction curves derived by the fracture model at Δa_fic=1.2 d_ave with the experiment results. According to the three-point-bending tests with SENB proposed by RILEM, tensile strength and fracture toughness can be predicted by the quasi-brittle fracture prediction model on concrete considering aggregate volume content effect.
- boundary effect model /
- quasi-brittle fracture /
- concrete aggregate /
- fracture toughness /
- tensile strength

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参考文献(31)

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文章访问数: 492
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被引次数: 29

考虑骨料体积含量影响的混凝土准脆性断裂预测模型及应用

通讯作者: 胡晓智(1957-),男,澳大利亚人,终身教授,博士,博导,从事断裂力学和先进材料与应用研究(E-mail:xhu@mech.uwa.edu.au).

计量

出版历程

QUASI-BRITTLE FRACTURE MODEL AND APPLICATION ON CONCRETE CONSIDERING AGGREGATE VOLUME CONTENT EFFECT

期刊类型引用(9)

其他类型引用(20)

计量

出版历程

目录

通讯作者:
胡晓智(1957-),男,澳大利亚人,终身教授,博士,博导,从事断裂力学和先进材料与应用研究(E-mail:xhu@mech.uwa.edu.au).