Abstract
For the difficulty of applying classical fracture criteria to the actual hydraulic engineering and silulating the process of cracking by conditional FEM, in this paper, a new method of analyzing and monitoring crack behavior in hydraulic structures under the effect of Hydro-Mechanical (HM) interaction is studied by using the XFEM, in which crack mouth opening displacement (CMOD) is adopted as monitoring index. The core innovation done in this study is that a method of determining macro crack tip is proposed based on cohesive force for the first time, and the critical value of CTOD is investigated and proved to be a material parameter. it is verified by comparing with the concrete tests and numerical calculations of former related literatures. All of the above shows that the present monitoring method based on CMOD provides a practical way to simulate cracking in hydraulic concrete structures.
Highlights
For some external or internal factors, certain parts of a hydraulic concrete structure may suffer a tension greater than the maximum tensile strength that the material can provide, which leads to the cracking of the structure during its construction or operation period
Considering that some joint meter are often laid in cracks to measure the crack mouth opening displacement (CMOD) of hydraulic concrete structures, but there isn’t a unified standard for applying CMOD as the parameter of crack
The relationship-curves between the CMOD and CTOD in the first three steps of the crack extension are given in Fig. (4)
Summary
For some external or internal factors, certain parts of a hydraulic concrete structure may suffer a tension greater than the maximum tensile strength that the material can provide, which leads to the cracking of the structure during its construction or operation period. Monitoring and analyzing the deformation of cracks is one of the important contents for safety evaluation of a hydraulic concrete structure. The most popular criteria determining whether cracks will extend or unstable are the maximum principal stress criterion, the crack-tip stress intensity factor criterion, the crack-tip opening displacement (CTODc) criterion and so on. Considering that some joint meter are often laid in cracks to measure the crack mouth opening displacement (CMOD) of hydraulic concrete structures, but there isn’t a unified standard for applying CMOD as the parameter of crack
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