既有混凝土结构理论钻芯深度研究  

Research on theoretical core drilling depth of existing concrete structures

作　　者：杨聪昆 周宏宇[3] 张志猛 江浩然 纪振兴 张强 YANG Congkun;ZHOU Hongyu;ZHANG Zhimeng;JIANG Haoran;JI Zhenxing;ZHANG Qiang(Testing Center Co.Ltd.,Beijing 100013,China;China Academy of Building Research Co.Ltd.,Beijing 100013,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]建研院检测中心有限公司,北京100013 [2]中国建筑科学研究院有限公司,北京100013 [3]北京工业大学建筑工程学院,北京100124

出　　处：《新型建筑材料》2024年第5期45-51,共7页New Building Materials

基　　金：国家自然科学基金项目(51978012)。

摘　　要：通过现场试验和数值模拟相结合的方法,对Φ100 mm、Φ75 mm两种规格的混凝土芯样理论钻芯深度进行研究。现场试验表明,2种直径的芯样断面均呈现不同斜度的斜断面形态;混凝土断裂芯样长度最小值对应的芯样损失长度均最大;损失长度与混凝土强度等级无明显的相关性。ANSYS有限元分析表明,芯样直径相同且钻芯深度相同时,当芯样的初始裂纹产生于根部时,损失长度最小;初始裂纹产生于端部时,损失长度最大;损失长度最大值不随混凝土强度等级而变化。研究得到了Φ100 mm、Φ75 mm混凝土芯样损失长度最大值,建立了理论钻芯深度的表达式,为既有混凝土结构钻芯工作提供参考。The theoretical drilling depth of concrete core samples with diameter of 100 mm and 75 mm was studied by combining field test and numerical simulation.The field testing shows that the cross sections of the two core samples with different diameters shows different oblique sections.The minimum length of concrete fracture core sample corresponds to the maximum loss length of core sample.There is no obvious correlation between the loss length and the strength grade of concrete.ANSYS finite element analysis shows that when the core sample diameter is the same and the core depth is the same,and when the initial crack of the core sample occurs at the root,the loss length is the smallest.When the initial crack occurs at the end,the loss length is the largest.The maximum value of loss length does not change with the strength grade of concrete.The maximum loss length of concrete core samples with diameter of 100 mm and 75 mm is obtained,and the expression of theoretical drilling core depth is established.This study provides reference for drilling of existing concrete structures.

关 键 词：钻芯试验 ANSYS 混凝土芯样 损失长度 初始裂纹 理论钻芯深度 

分 类 号：TU528.06[建筑科学—建筑技术科学]