2020 Fiscal Year Research-status Report
Development and application of a numerical model for fatigue performance assessment of UHPFRC-repaired RC bridge decks
| Project/Area Number |
20K14808
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| Research Institution | Hokkaido University |
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Principal Investigator |
DENG PENGRU 北海道大学, 工学研究院, 助教 (60825587)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | UHPFRC / Fatigue / Bridge deck / FEM / Rehabilitation |
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| Outline of Annual Research Achievements |
Quasi-static 4-point flexural tests were conducted at the beginning (28 days), middle (90 days), and end (165 days) of the fatigue tests to get the static load capacity and age effects.
Static 4-point flexural tests were conducted under quasi-dynamic conditions of 60 mm/min and 400 mm/min to investigate the effects of strain rate.
Load controlled fatigue 4-point flexural tests were performed on 57 specimens under 6 fatigue loading levels, where a 3Hz sinusoidal cyclic loading was employed as this frequency is close to that on real bridge decks.
FEA of tested UHPFRC beams were conducted, where a fatigue degradation model was preliminarily proposed by fitting experimental S-N relation.
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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
According to the plan, the tasks of 2020 are conduct static and fatigue flexural tests on UHPFRC beams and then propose a material degradation law through fitting the experimental results numerically exploiting FEM. All of these works have been completed as listed in the “Summary of Research Achievements”.
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| Strategy for Future Research Activity |
1. A large amount of data processing on the fatigue tests will be completed to get comprehensive structural behaviors.
2. Further investigations mainly aiming at figuring out the fiber distribution and orientation will be conducted to understand the static as well as fatigue structural behaviors from micromechanics.
3. A high-level technical article about the fatigue test results will be prepared and submitted to a well-recognized journal to share with the community.
4. A more comprehensive material degradation model will be developed and integrate into FEM to develop an accurate numerical model for analyzing UHPFRC structures. The model will then be consolidated, improved, and verified by analyzing the UHFPRC-repaired RC slabs which have been tested.
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[Presentation] Finite element analysis on the strengthening effect of the orthotropic steel decks with the UHPFRC overlay subjected to wheel-type loads2021
Author(s)
Ma, C. H., Deng, P. R., Ueda, K., Mitamura, H., and Matsumoto, T
Organizer
Tenth International Conference on Bridge Maintenance, safety and Management
Int'l Joint Research
