管俊峰, 马越, 何双华, 姚贤华, 李列列, 陈珊珊, 贾胜. 设计定量几何结构试件预测混凝土结构断裂特性[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2022.08.0709
引用本文: 管俊峰, 马越, 何双华, 姚贤华, 李列列, 陈珊珊, 贾胜. 设计定量几何结构试件预测混凝土结构断裂特性[J]. 工程力学. DOI: 10.6052/j.issn.1000-4750.2022.08.0709
GUAN Jun-feng, MA Yue, HE Shuang-hua, YAO Xian-hua, LI Lie-lie, CHEN Shan-shan, JIA Sheng. PREDICTING FRACTUER BEHAVIOR OF CONCRETE STRUCTURE USING DESIGNED QUANTITATIV SPECIMENS WITH DIFFERENT STRUCTURAL GEOMETRY PARAMETER[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2022.08.0709
Citation: GUAN Jun-feng, MA Yue, HE Shuang-hua, YAO Xian-hua, LI Lie-lie, CHEN Shan-shan, JIA Sheng. PREDICTING FRACTUER BEHAVIOR OF CONCRETE STRUCTURE USING DESIGNED QUANTITATIV SPECIMENS WITH DIFFERENT STRUCTURAL GEOMETRY PARAMETER[J]. Engineering Mechanics. DOI: 10.6052/j.issn.1000-4750.2022.08.0709

设计定量几何结构试件预测混凝土结构断裂特性

PREDICTING FRACTUER BEHAVIOR OF CONCRETE STRUCTURE USING DESIGNED QUANTITATIV SPECIMENS WITH DIFFERENT STRUCTURAL GEOMETRY PARAMETER

  • 摘要: 该文采用描述试件尺寸、裂缝长度、前后边界、加载型式等耦合影响的几何结构参数ae,替代传统尺寸效应理论所用的单一试件尺寸W,阐释了混凝土强度与断裂特性尺寸效应的细观物理机制。不拘泥于实验室条件下试件尺寸、裂缝长度、加载型式等条件的选取限制,发展建立了由任意两组ae比值为3的设计试件,来确定混凝土无尺寸效应的真实断裂与强度参数的模型与方法。基于所提方法,由ae比值为3的设计试件,建立起混凝土不同断裂模式的转换曲线,其±15%即可涵盖实验室条件下的试件测试结果;将实际结构的等效面积代入所提解析公式,可预测大尺寸实际结构的峰值荷载。该文的研究内容搭建了实验室条件下与现场条件下确定混凝土真实材料性能的纽带;实现了由定量的不同几何结构的实验室试件,准确预测现场混凝土结构真实断裂性能的目的。

     

    Abstract: A structural geometry parameter ae, which can reflect the coupling effects of specimen size, crack length, front & back boundaries and loading types, is used to replace the absolute size W used in the traditional size effect theory to explain the microphysical mechanism of the size effect of strength and fracture characteristics. The model and associate method for determining the true fracture and strength parameters of concrete without size effect are developed and established by two groups of design specimens with ae ratio of 3, not restricted by the selection of specimen size, crack length, loading type and other conditions under laboratory conditions. Based on the proposed method, the transformation curves of different fracture modes of concrete are established for the designed specimens with ae ratio equal to 3, and a ±15% variation of the curves can cover the test results of the specimens under laboratory conditions; Taking the equivalent area of the actual structure into the proposed analytical formula, the peak load of large-size actual structures can be predicted. link is built to determine the real material properties of concrete in field conditions using laboratory results, and the goal of accurately predicting concrete fracture characteristics using quantitative laboratory specimens with different structural geometry parameters can be realized.

     

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