Life-cycle resilience based approach for road network retrofitting prioritization under multiple hazards(Fostering Joint International Research)

2019 Fiscal Year Annual Research Report

• Project/Area Number: 16KK0152
• Research Institution: Waseda University
• Principal Investigator: 秋山 充良 早稲田大学, 理工学術院, 教授 (00302191)
• Project Period (FY): 2017 – 2019
• Keywords: ライフサイクル / リスク / レジリエンス / 道路ネットワーク / 構造信頼性 / マルチハザード / フラジリティ解析

Outline of Annual Research Achievements

2018年8月6日～2019年9月23日まで，米国Lehigh大学に滞在し，Professor FrangopolやDr. Bocchiniらとの共同研究を実施した．最終年度および研究期間全体を通じて得られた成果の概要を以下に示す．
(1) 南海トラフ地震の影響を受ける三重県尾鷲市にある橋梁・盛土構造物の強震動および津波による損傷確率の算定を行い，道路ネットワークのリスクおよびレジリエンスを確率論的に評価し，補強の効果を比較することでネットワークを構成する各種構造物の補強優先度を検討した．また，リスクアプローチを応用することで，三重県全域で生じ得る津波廃棄物量を推定した．津波廃棄物は，2011年東北地方太平洋沖地震の復興を妨げる大きな要因となっており，この処理量を事前に想定し，その対策を施すことは地域の津波災害に対するレジリエンスの強化につながる．三重県内の主要都市を対象に，津波廃棄物量のリスクカーブを提示している．
(2) 既存鉄筋コンクリート（RC）構造物では，中性化や塩害による鉄筋腐食が生じる場合がある．同一の部材においても，位置により劣化に対する抵抗力が異なるため，腐食の程度は構造物内の各地点で変動する．つまり，腐食量が大きい，あるいは腐食量が小さい場所が空間的に変動しているため，その分布によって部材耐力や変形能もばらつきを持つことになる．劣化RC構造物の構造性能評価の精緻化には，この材料劣化の空間変動性の考慮が不可欠である．塩害環境に置かれたRC構造物を対象として，ライフタイムにわたる材料劣化の進展とそれが構造性能の低下に及ぼす影響を考慮した既存研究は見られるが，そこでは，材料劣化は構造物全体で一様に進展すると仮定しており，劣化の空間変動性は考慮されていない．RC構造物で生じる材料劣化の進展を2次元ガウス・非ガウス確率場にて表現し，その構造性能評価を行った．

Research Products

• [Int'l Joint Research] Lehigh University(米国) (2018)
  • Year and Date: 2018-08-06 – 2019-09-23
  • Country Name: U.S.A.
  • Counterpart Institution: Lehigh University
  • Co-investigator Overseas: Dan Frangopol
  • Department: ATLSS Center
  • Job Title: 教授
  • Change Date: 2018年10月17日
• [Journal Article] Bidirectional shaking table tests of a low‐cost friction sliding system with flat‐inclined surfaces (2020)
  • Author(s): Brito Miguel B.、Akiyama Mitsuyoshi、Ichikawa Yoshitaka、Yamaguchi Hiroki、Honda Riki、Ishigaki Naomitsu
  • Journal Title: Earthquake Engineering & Structural Dynamics Volume: オンライン公開中 Pages: オンライン公開中
  • DOI: 10.1002/eqe.3266
  • Peer Reviewed / Open Access
• [Journal Article] 南海トラフ地震により生じる津波災害廃棄物量のリスク評価 (2020)
  • Author(s): 小島貴之，石橋寛樹，秋山充良，越村俊一
  • Journal Title: 構造工学論文集 Volume: 66A Pages: 159-169
  • Peer Reviewed / Open Access
• [Journal Article] 強震動と津波ハザードの連続性を考慮した橋梁・盛土構造物の信頼性評価法の提案と南海トラフ地震を想定したケーススタディ (2020)
  • Author(s): 橋寛樹，小島貴之，秋山充良，越村俊一
  • Journal Title: 土木学会論文集A1 Volume: 76 Pages: 41-60
  • Peer Reviewed / Open Access
• [Journal Article] Toward life-cycle reliability-, risk- and resilience-based design and assessment of bridges and bridge networks under independent and interacting hazards: emphasis on earthquake, tsunami and corrosion (2019)
  • Author(s): Akiyama Mitsuyoshi、Frangopol Dan M.、Ishibashi Hiroki
  • Journal Title: Structure and Infrastructure Engineering Volume: 16 Pages: 26～50
  • DOI: 10.1080/15732479.2019.1604770
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] LCC-based identification of geographical locations suitable for using stainless steel rebars in reinforced concrete girder bridges (2019)
  • Author(s): Hasan Md Abul、Yan Kekui、Lim Sopokhem、Akiyama Mitsuyoshi、Frangopol Dan M.
  • Journal Title: Structure and Infrastructure Engineering Volume: オンライン公開中 Pages: 1～27
  • DOI: 10.1080/15732479.2019.1703758
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Life-cycle reliability-based design and reliability updating of reinforced concrete shield tunnels in coastal regions (2019)
  • Author(s): He Zheng-Shu、Supasit Srivaranun、Akiyama Mitsuyoshi、Frangopol Dan M.
  • Journal Title: Structure and Infrastructure Engineering Volume: 16 Pages: 726～737
  • DOI: 10.1080/15732479.2019.1674343
  • Peer Reviewed / Open Access
• [Journal Article] A Study on the Design Method for the Material Composition of Small Particle-Size Asphalt Mixture for Controlling Cracks in Asphalt Pavement (2019)
  • Author(s): Xin Jiyu、Pei Jianzhong、Akiyama Mitsuyoshi、Li Rui、Zhang Jiupeng、Shao Libo
  • Journal Title: Applied Sciences Volume: 9 Pages: 1988～1988
  • DOI: 10.3390/app9101988
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Reliability estimation of corroded RC structures based on spatial variability using experimental evidence, probabilistic analysis and finite element method (2019)
  • Author(s): Zhang Mingyang、Song Huijuan、Lim Sopokhem、Akiyama Mitsuyoshi、Frangopol Dan M.
  • Journal Title: Engineering Structures Volume: 192 Pages: 30～52
  • DOI: 10.1016/j.engstruct.2019.04.085
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Risk Estimation of Bridges and Bridge Networks under Seismic and Subsequent Tsunami Hazards. (2019)
  • Author(s): Ishibashi, H., Kojima, T., Nanami, K., Akiyama, M., and Frangopol, D.M.
  • Organizer: Proceeding of the 16th East Asia-Pacific Conference on Structural Engineering & Construction (EASEC-16)
  • Int'l Joint Research
• [Presentation] Updating the Reliability of Existing RC Structures in a Marine Environment incorporating Spatial Variations (2019)
  • Author(s): Masuda, K., Srivaranun, S., Akiyama, M.
  • Organizer: Proceeding of the 16th East Asia-Pacific Conference on Structural Engineering & Construction (EASEC-16)
  • Int'l Joint Research
• [Presentation] Shaking table test of RC columns with a low-cost sliding pendulum system under bi-directional excitations (2019)
  • Author(s): Yamaguchi, H., Brito, M.B, Ichikawa, Y., Ishigaki, N., Akiyama, M., Honda, R.
  • Organizer: The Third International Bridge Seismic Workshop
  • Int'l Joint Research
• [Presentation] Reliability-Based Durability Design of Shield Tunnels in Coastal Regions (2019)
  • Author(s): He, Z., Akiyama, M. and Frangopol, D.M.
  • Organizer: 13th International Conference on Applications of Statistics and Probability in Civil Engineering(ICASP13)
  • Int'l Joint Research
• [Presentation] Life-Cycle Performance Assessment of Road Network Under Multiple Hazards (2019)
  • Author(s): Ishibashi, H., Nanami, K., Kojima, T., Kawai, Y., Akiyama, M. and Frangopol, D.M.
  • Organizer: 13th International Conference on Applications of Statistics and Probability in Civil Engineering(ICASP13)
  • Int'l Joint Research
• [Presentation] Modeling Spatial Variability of Steel Corrosion Using Gumbel Distribution (2019)
  • Author(s): Zhang, M., Lim, S., Akiyama, M. and Frangopol, D.M.
  • Organizer: 13th International Conference on Applications of Statistics and Probability in Civil Engineering(ICASP13)
  • Int'l Joint Research
• [Presentation] Time-Dependent Structural Performance Analysis of RC Slab Exposed to Chloride Attack by Incorporating Spatial Variability (2019)
  • Author(s): Srivaranun, S., Masuda, K., Akiyama, M. and Frangopol, D.M.
  • Organizer: 13th International Conference on Applications of Statistics and Probability in Civil Engineering(ICASP13)
  • Int'l Joint Research