2014 Fiscal Year Annual Research Report
コンクリートの凍害および凍害－疲労複合劣化シミュレーション
| Project/Area Number |
14J01638
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| Research Institution | Hokkaido University |
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Principal Investigator |
弓 扶元 北海道大学, 大学院工学院, 特別研究員(DC2)
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| Project Period (FY) |
2014-04-25 – 2016-03-31
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| Keywords | Mesoscale simulation / Concrete / Frost damage / Fatigue loading / Rigid Body Spring Method / Pore pressure / Combined effect |
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| Outline of Annual Research Achievements |
This research is mainly to develop a mesoscale analyzing system for the frost damage problems of concrete structures, together with the combining effects by external loads. Till now, the comprehensive physical and mechanical model, as well as the numerical method are still absent, which are the main purposes of this research project.The current finished schedule follows the research plan well. The detailed work are as follows:
1. The theoretical physical model has been developed to calculate the pore pressures generated inside the concrete material during under different temperatures and environmental conditions. This calculated pressures are essential to understand the frost damage mechanism and further mechanical modeling. (One journal paper was published)
2. The mesoscale simulation model has been developed based on Rigid Body Spring Model (RSBM), and the using the pore pressure model developed above, the material deformation can be simulated. (One journal paper is under review)
3. Based on the multi-phase composite theory, the expression of effective elastic modulus of concrete with different amount of ice, liquid water and air is developed. The numerical model of the combined effect is developed using RSBM and the static strengths are simulated. (One journal paper is under writing)
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The whole research project can be divided into 4 steps: 1. Physical model of the pore pressures during frost action; 2. The mechanical model and numerical simulation of pure frost damage; 3. The modeling and simulation of combined frost action and static loading; 4. The study of combined frost action and fatigue loading. And currently, the first three steps have been finished.
The current finished schedule follows the research plan well. Two journal papers (one published, one under review) for the physical model and numerical simulation of pure frost damage; one paper (under writing) for the modeling and simulation of combined frost action and static loads; the combined effect with fatigue loading is now under study.
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| Strategy for Future Research Activity |
1. Develop the mechanical model and constitutive laws for the combined process with fatigue loading. (2015.4-2015.5)
2. The RBSM simulation to predict the material damage and fatigue life. (2015.6-2015.9)
3. Conduct the necessary experiments to verify the simulation results. (2015.10-2015.12)
4. Writing the doctor thesis. (2016.1-2016.2)
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Research Products
(7 results)
