Mechanisms of crack propagation due to corrosion of reinforcement in concrete by AE-SiGMA and BEM
Mechanisms of crack propagation due to corrosion of reinforcement in concrete by AE-SiGMA and BEM
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DOI：
10.1016/j.conbuildmat.2003.10.007
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发表时间：
2003-12
影响因子：
7.4
通讯作者：
A. F. Uddin;K. Numata;Jun Shimasaki;M. Shigeishi;M. Ohtsu
中科院分区：
文献类型：
--
作者：
A. F. Uddin;K. Numata;Jun Shimasaki;M. Shigeishi;M. Ohtsu
采用声发射简化格林矩张量函数分析腐蚀裂纹的成核，定量确定裂纹的位置、类型和方向。这些运动结果以三维位置和矢量的形式得到，并利用虚拟现实建模语言进行三维可视化。该方法适用于钢筋混凝土的腐蚀开裂。为了明确裂纹扩展的机理，采用边界元法进行了数值分析。研究了三种腐蚀裂纹模式下应力强度因子与裂纹扩展增量的关系。研究了无因次应力强度因子和裂纹模式。结果表明，钢筋腐蚀引起的开裂机制以ⅰ型裂纹为主，混合裂纹和ⅱ型裂纹次之。
Nucleation of corrosion cracking is analyzed by acoustic emission-simplified Green's functions for moment tensor analysis, by which crack kinematics of locations, types and orientations are quantitatively determined. These kinematical outcomes are obtained as 3D locations and vectors, and thus visualized three-dimensionally by using virtual reality modeling language. The procedure is applied to corrosion cracking in reinforced concrete. To clarify the mechanisms of crack extension due to corrosion, numerical analysis is conducted by the boundary element method. A relation between the stress intensity factors and the increment of crack extension is studied on three crack patterns due to corrosion. The dimensionless stress intensity factors and the cracking modes are investigated. It is confirmed that cracking mechanisms due to corrosion of reinforcement are dominantly of the mode-I crack, along with mixed-mode and mode-II cracks.