| 摘要: |
| 针对尺寸效应率和边界效应模型在混凝土名义强度的尺寸效应分析中存在分歧等问题，基于幂定律和等效弹性裂缝方法，提出了可综合考虑试件尺寸、初始裂缝长度以及断裂过程区对混凝土名义强度影响的尺寸效应模型.该模型融合了尺寸效应率和边界效应模型在混凝土名义强度尺寸效应分析中的影响因素，而且所需要的经验参数较少、求解方便.结合试验数据以及现有文献中的研究数据，对所提出的尺寸效应模型进行了验证，结果表明：所提出的模型可以较好地描述和预测混凝土材料的准脆性断裂行为，对试件的几何形状没有限制. |
| 关键词: 混凝土 名义强度 尺寸效应 幂定律 等效弹性裂缝方法 |
| DOI：103969/j.issn.1007 9629201705004 |
| 分类号: |
| 基金项目:“十三五”国家重点研发计划项目（2017YFC0404900）;国家自然科学基金资助项目（51779034，51678113，51309195）;中央高校基本科研业务费项目（DUT17ZD219，DUT17LK56） |
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| Study on Size Effect of Concrete Nominal Strength |
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LIU Xingyang1, ZOU Degao1, LI Zhanchao2
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1.School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China;2.College of Water Resources and Architectural Engineering, Northwest A&F University,Yangling 712100, China
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| Abstract: |
| In view of the divergence in the size effect analysis of concrete nominal strength between the size effect law and boundary effect model of concrete, a novel size effect model based on a power law and equivalent elastic crack method was proposed. The influence of the specimen size, initial crack length and fracture process zone on the nominal strength of concrete was taken into account in the proposed model simultaneously. The influence factors of size effect law and boundary effect model were included in the proposed model, the few empirical parameters of this model were convenient to determine. The proposed model was verified through the experimental data and research data in the existing literature. The results show that the proposed model can properly describe and predict the quasi brittle fracture behavior of concrete material, the limit of size or geometry of the specimens will vanish. |
| Key words: concrete nominal strength size effect power law equivalent elastic crack method |
