| Project/Area Number |
17360207
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
TERADA Kenjiro TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, ASSOCIATE PROFESSOR, 大学院工学研究科, 助教授 (40282678)
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| Co-Investigator(Kenkyū-buntansha) |
KYOYA Takashi TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, PROFESSOR, 大学院工学研究科, 教授 (00186347)
YAMADA Masaki TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, RESRACH ASSOCIATE, 大学院工学研究科, 助手 (30323083)
ISHII Tateki KISARAZU NATIONAL COLLEGE OF TECHNOLOGY, DEPATMENT OF CIVIL ENNGINEERING, LECTURER, 環境都市工学科, 講師 (60400280)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2005: ¥5,300,000 (Direct Cost: ¥5,300,000)
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| Keywords | REINFORCED CONCRETE / CORROSION / HOMOGENIZATION METHOD / MULTI-SCALE ANALYSIS / MULTI-PHYSICS ANALYSIS / CRACK PROPAGATION ANALYSIS / FINITE ELEMENT METHOD / FINITE COVER METHOD |
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| Research Abstract |
We developed a multi-scale multi-physics analysis method for mass concentration diffusion and deformation in quasi-brittle materials such as concrete materials, with a view to the evaluation of time-series environmental deterioration. The structural failure in micro-structures was evaluated by a simple damage model and analyzed by the voxel finite element method. The application of the homogenization method enables us to evaluate the change over time in macroscopic elastic and diffusion properties.
We also proposed a multi-scale analysis method for heat conduction problem of porous media based on the homogenization method. For the implementation of multi-scale heat conduction analysis, we discuss the differences and characteristics of the homogenization for heat conduction problem in comparison with that for deformation problem particularly by focusing our attention to the definition of micro-structure (unit cell). First, we formulated the homogenization method for heat conduction probl
… More
em considering the heat transfer at porous boundaries in micro-scale and specify the points to notice of the formulation. Secondly, we examined the validity of the proposed method of multi-scale heat conduction analysis based on the homogenization method by carrying out simple several numerical experiments. Finally, a 3-dimensional numerical example for porous medium at elevated temperature is presented to demonstrate the capability of the method.
The finite cover method (FCM) for quasi-brittle heterogeneous solids and the associated modeling method was developed. After introducing the FCM in conjunction with the mortar approximations for material interfaces, and attracting attention to the modeling of surfaces of strong discontinuities and material interfaces by means of spatially fixed regular mesh, we presented the associated modeling method for complex heterogeneous solids and discussed the issues in computational implementation especially for dealing with multiple cohesive crack growth in meso-scale heterogeneous media. Then, after carrying out simple performance studies, we demonstrated the promise and potential of the proposed method in several numerical examples.
By performing numerical simulations of propagating cracks in concrete due to reinforcement corrosion, we illustrated various modes of crack paths according to the thickness of overburden for reinforcing steel, and investigated their underlying mechanisms. In order to accurately simulate the initiation and propagation of cracks, we enhanced the finite cover method (FCM) so as to working with regularly structured mesh without remeshing and characterized nonlinear behavior of process zone fracture by means of the cohesive crack model. The method enabled us to not only reproduce the modes of crack paths reported in experimental studies, but also predict the deterioration of concrete. Less
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