Evaluation of residual structural performance of damaged bridge members by three dimensional meso scale analysis and its retrofit

• Project/Area Number: 16H04388
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: The University of Tokyo
• Principal Investigator: NAGAI Kohei 東京大学, 生産技術研究所, 准教授 (00451790)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000); Fiscal Year 2018: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2017: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2016: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
• Keywords: コンクリート / 残存構造性能 / 離散解析 / 腐食 / 鉄筋付着

Outline of Final Research Achievements

Three dimensional meso scale analysis system was expanded by introducing the local bond model for corrosion damage where the constitutive model was developed by the experiments. The local corrosion can be directly considered as the input of simulation that enable to evaluate the residual structural performance of damaged reinforced concrete. This system was applied to the case of corrosion damage at the anchorage part. The influence of anchorage damage on the overall structural performance was examined. For the expansion problems such as ASR or DEF, the expansion model was introduced to the simulation system and the residual strength reduction can be simulated.

Academic Significance and Societal Importance of the Research Achievements

社会基盤構造物の劣化が顕著となり，その維持管理は社会的な問題となっている。鉄筋コンクリート構造物の腐食による劣化は，その最も主たる問題であり，腐食が生じたのちの残存構造性能評価は，適切な維持管理や補修方法の決定に重要である。しかし，鉄筋の腐食は鉄筋軸に沿って一様でなく分布しており，それを考慮した評価方法が必要である。本研究で構築した解析システムは，約5mmごとの腐食を直接的に導入し鉄筋コンクリート部材の残存構造性能を評価可能としている。コンピュータの性能向上に伴い，この解析システムの実構造物への適用が広がると期待できる。

Research Products

• [Journal Article] Development of Spatial Corrosion Damage Simulation Based on Rigid Body Spring Model (2018)
  • Author(s): Punyawut JIRADILOK, Kohei NAGAI, Koji MATSUMOTO
  • Journal Title: Proceedings of 12th fib International PhD Symposium in Civil Engineering Volume: - Pages: 467-475
• [Journal Article] Fatigue Pull-out Failure of Deformed Bars in Concrete under the Effect of Liquid Water (2018)
  • Author(s): Koji MATSUMOTO, Hirofumi YAMAGUCHI, Kohei NAGAI
  • Journal Title: Cement and Concrete Composites Volume: 91 Pages: 198-208
  • Peer Reviewed
• [Journal Article] Development of Bond Deterioration Model in Corroded RC Member for Discrete Analysis Model (2018)
  • Author(s): Kohei NAGAI, Punyawut JIRADILOK, Koji MATSUMOTO
  • Journal Title: Proceedings of 17th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA) Volume: -
  • NAID: 130007685266
• [Journal Article] Investigation on Possible Causes of Expansion Damages in Concrete - a Case Study of Sleepers in Indian Railways (2017)
  • Author(s): Anupam AWASTHI, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO, Seishi GOTO
  • Journal Title: Journal of Asian Concrete Federation Volume: 3 Pages: 49-66
  • Peer Reviewed / Open Access
• [Journal Article] Investigation on Strengthening Approaches Adopted for Poorly Detailed RC Corbels (2017)
  • Author(s): Ram Chandra NEUPANE, Liyanto EDDY, Kohei NAGAI
  • Journal Title: fibers Volume: 5 Pages: 16-16
  • Peer Reviewed
• [Journal Article] Numerical Simulation of Beam-column Knee Joints with Mechanical Anchorages by 3D Rigid Body Spring Model (2016)
  • Author(s): Liyanto EDDY, Kohei NAGAI
  • Journal Title: Engineering Structures Volume: 126 Pages: 547-558
  • Peer Reviewed
• [Journal Article] Effect of Perpendicular Beams on Failure of Beam-column Knee Joints with Mechanical Anchorages by 3D RBSM (2016)
  • Author(s): Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI
  • Journal Title: Journal of Asian Concrete Federation Volume: 2 Pages: 56-66
  • Peer Reviewed
• [Journal Article] Investigation on the Pull-out Behavior of Deformed Bars in Cracked Reinforced Concrete (2016)
  • Author(s): Koji MATSUMOTO, Tao WANG, Daisuke HAYASHI, Kohei NAGAI
  • Journal Title: Journal of Advanced Concrete Technology Volume: 14 Pages: 573-589
  • NAID: 130005418889
  • Peer Reviewed
• [Journal Article] A Study on the Effect of Diagonal Cracks Opening on the Failure Behavior of RC Beam-column Join with Mechanical Anchorage by 3D RBSM (2016)
  • Author(s): Kohei NAGAI, Liyanto EDDY
  • Journal Title: Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9) Volume: -
  • DOI: 10.21012/fc9.114
• [Journal Article] Meso-scale Approach to Investigate the Bond Performance of Anchorage in Reinforced Concrete (2016)
  • Author(s): Daisuke HAYASHI, Kohei NAGAI:
  • Journal Title: Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9) Volume: -
  • DOI: 10.21012/fc9.123
• [Journal Article] Effect of Transverse Bar on Anchorage Performance in Damaged RC with Mechanical Anchorage (2016)
  • Author(s): Tao WANG, Koji MATSUMOTO, Kohei NAGAI
  • Journal Title: Proceedings of the 11th fib International PhD Symposium in Civil Engineering Volume: - Pages: 485-492
• [Journal Article] Mesoscopic Analysis of Different Expansion Causes in Concrete by 3D Rigid Body Spring Model (2016)
  • Author(s): Liyanto EDDY, Anupam AWASTHI, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO
  • Journal Title: Proceedings of 15th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA) Volume: -
  • NAID: 130005872092
• [Journal Article] 新潟県及び県下市町村管理橋梁の経年劣化傾向比較 (2016)
  • Author(s): 松藤洋照，長井宏平，井林康
  • Journal Title: 土木学会第71回年次学術講演会 Volume: 71, Ⅰ Pages: 179-180
• [Journal Article] 橋梁定期点検調書における写真の撮り方および記載単語の基礎的傾向分析 (2016)
  • Author(s): 小黒蓮，井林康，長井宏平
  • Journal Title: 土木学会第71回年次学術講演会 Volume: 71, Ⅴ Pages: 77-78
• [Presentation] Development of Bond Deterioration Model in Corroded RC Member for Discrete Analysis Model (2018)
  • Author(s): 長井宏平
  • Organizer: Proceedings of 17th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA)
  • Int'l Joint Research
• [Presentation] Mesoscopic Analysis of Different Expansion Causes in Concrete by 3D Rigid Body Spring Model (2016)
  • Author(s): Koji MATSUMOTO
  • Organizer: 15th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA)
  • Place of Presentation: タクロバン，フィリピン
  • Year and Date: 2016-11-07
  • Int'l Joint Research
• [Presentation] 新潟県及び県下市町村管理橋梁の経年劣化傾向比較 (2016)
  • Author(s): 松藤洋照
  • Organizer: 土木学会第71回年次学術講演会
  • Place of Presentation: 東北大学，仙台
  • Year and Date: 2016-09-07
• [Presentation] 橋梁定期点検調書における写真の撮り方および記載単語の基礎的傾向分析 (2016)
  • Author(s): 小黒蓮
  • Organizer: 土木学会第71回年次学術講演会
  • Place of Presentation: 東北大学，仙台
  • Year and Date: 2016-09-07
• [Presentation] A Study on the Effect of Diagonal Cracks Opening on the Failure Behavior of RC Beam-column Join with Mechanical Anchorage by 3D RBSM (2016)
  • Author(s): Kohei NAGAI
  • Organizer: 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9)
  • Place of Presentation: カリフォルニア，アメリカ
  • Year and Date: 2016-05-30
  • Int'l Joint Research
• [Presentation] Meso-scale Approach to Investigate the Bond Performance of Anchorage in Reinforced Concrete (2016)
  • Author(s): Daisuke HAYASHI
  • Organizer: 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9)
  • Place of Presentation: カリフォルニア，アメリカ
  • Year and Date: 2016-05-30
  • Int'l Joint Research