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Monitoring and Retrofitting Structures with Intelligences

Research Project

Project/Area Number 09044129
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research Field 構造工学・地震工学
Research InstitutionIbaraki University

Principal Investigator

WU Zhishen  Ibaraki Univ., Associate Professor, 工学部, 助教授 (00223438)

Co-Investigator(Kenkyū-buntansha) 岑 章志  中国清華大学, 工学部, 教授
IWAMATSU Sachio  Fukushima National College of Technology, President, 校長 (10160136)
HARADA Takao  Ibaraki Univ., Research Associate, 工学部, 助手 (00241745)
NUMAO Tatsuya  Ibaraki Univ., Associate Professor, 工学部, 助教授 (90164649)
FUKUZAWA Kimio  Ibaraki Univ., Professor, 工学部, 教授 (50165271)
CEN Zhangzhi  Tsinghua Univ., Professor
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1998: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1997: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsExisting large-scale brittle structures / infrared thermography system / laser doppler velocitometer / FRP sheets / damage assessment / Structural health monitoring / Intelligent adoptive Structures / Repair / strenghtening / retrofitting
Research Abstract

1. The Failure Process evaluation of Brittle Structure system : On this research topic, a failure path approach for time -variant system reliability estimation of brittle structures has been developed The March chain assumption is used to model the cumulative damage under time variant loads. The effect of load overlapping under multiple load processes is investigated. Moreover, a probabilistic model for the randomness of the progressive crack growth in a quasi-brittle material is proposed. The method is implemented by finite element approach with a smeared crack model and R-curve approach.
2. Experimental/numerical investigations on bond behavior and its improvement strategies : Through a series of experimental programs on three bending beams, double -shear specimens pulled in tension and simple shear specimens, the bond behavior of concrete-FRP interface influenced by compressive strengths, epoxy characteristics and constructional conditions, the Quantities of FRP sheets, and the rough … More ness of interface etc.has been investigated and several improvement strategies on the bond behavior and self repair of de-bonding have been also proposed. The Cohesive interfacial Crack model based on nonlinear fracture mechanics was also proposed. As the numerical analysis approach, both FEM and BEM methods were used to simulate the dc-bonding propagation.
3. Optimization of reinforcement design of FRP sheets : The hybrid concept with different kinds of FRP sheets has been developed to improve the structural behavior and optimum design method of strengthened structures was also proposed through this research. Moreover, a new method to use carbon fiber sheets which was presiressed before they were bonded to the concrete surface is developed to improve different reinforcement effects.
4. Defect and de-bonding detection and health structural monitoring system : Two detection systems with both Laser Doppler Velocitometer and Infrared Thermography have been proposed for the de-bonding or other interfacial cracks effectively. And a resistance heating cells embedded in concrete-FRP interface layer is designed in order to make a possible real -time monitoring of interfacial de-bonding. Moreover an active damage detection on crack initiation and its propagation in brittle materials and structures using a build-in network of piezoelectric transducers was proposed.
5. Decentralized Adaptive Vibration Control of Complex Structure : In this paper, a new neural network based decentralized control algorithm has been developed for active control of large scale or complex structures which were considered to be controlled with multiple actuators. The concept of information substructures decomposed depending upon the control areas of actuators was introduced successfully in the decentralized control algorithm. Results from computer-simulation studies through the comparison of different control strategies have shown the effectiveness of the proposed method.
6. Identification algorithms for the assessment of structural damages : In order to proposed an identification model for a large-scale structure system, firstly, a general framework of inverse analysis is developed for the static parameter estimation problem using Hopfield Neural Network. Secondly, a dynamic localized structural identification method with perturbation technique has been developed for large-scale structures. Moreover, a two-stage identification algorithm for the assessment of structural damages have been also developed using the modal test data. The effectiveness of all of these models were illustrated by numerically simulating several complex structural systems. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (48 results)

All Other

All Publications (48 results)

  • [Publications] 呉 智深, 周 平, 田名部 菊次郎, 西澤 修: "非接触レーザー振動計測システムによる炭素繊維シートの剥離の測定法に関する研究" 土木学会コンクリート構造物の補強設計に関するシンポジウム論文集. 51-59 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 呉 智深, 田名部 菊次郎, 松崎 智優, 福沢,公夫, 神田 健: "炭素繊維シートの緊張接着による鉄筋コンクリート梁部材の補強特性" 日本コンクリート工学協会連続繊維補強コンクリートに関するシンポジウム論文集. 67-74 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 呉 智深, 松崎,智優, 田名部 菊次郎: "FRPシート補強コンクリート梁の破壊メカニズムに関する実験的研究" 日本コンクリート工学協会連続繊維補強コンクリートに関するシンポジウム論文集. 119-126 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 周 平, 呉 智深, 田名部 菊次郎, 西澤 修: "非接触レーザー速度計による炭素繊維シートの接着浮きの検査手法に関する研究" 土木学会構造物の診断に関するシンポジウム論文集. 289-292 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z., Yin, J., Asakura,T.: "Fracturing Response Simulation of FRP-Reinforced Concrete Beames by Mixed Finite Elements" Journal of Applied Mechanics. Vol. 1. 337-344 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 白井 奈津子, 呉 智深, 原田 隆郎: "階層型ニューラルネットワークを用いたせん断質点システムの振動制御に関する研究" 土木学会第53回年次学術講演会講演概要集. I-B475. 950-951 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長谷部 崇, 呉 智深, 高橋 学: "圧電セラミックスアクチュエータの振動変化による脆性構造体内部の損傷のモニタリングに関する研究" 土木学会第53回年次学術講演会. V-86. 172-173 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Chen, T., Wang, B., Cen, Z., Wu, Z.S.: "Cohesive crack analysis by Galerkin Boundary element method" Proc. 8th China-Japan Symposium on Boundary Element Methods. 67-76 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Chen, T., Wang, B., Cen, Z., Wu, Z.S.: "Asymmetric Galerkin Multi-zone BEM for cohesive crack growth" Int. J. Engineering Fracture Mechanics. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 呉 智深, 佐々木 雄一, 原田 隆郎, 岩松 幸雄: "相互結合型ニューラルネットワークによる離散化構造同定法の開発" 計算工学講演会論文集. Vol. 2. 781-784 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 阿部 勇, 呉 智深, 高橋 学, 田名部,菊次郎: "圧電セラミックスのアクチュエータ特性による脆性体の破壊現象に及ぼす影響に関する実験的研究" 土木学会第52回年次学術講演会. V-137. 274-275 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yao, Z., Qu, S.: "Identification of the material paramenters of laminated plates" Inverse Problems in Engineering Mechanics. 179-185 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Yin, J.: "Analysis of Mixed-Mode Brittle Fractures by Mixed Finite Element with Internal Displacement Discontinuities" Proceedings of the Conference on Computational Engineering. Vol. 3. 841-844 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 市來 佐都子, 呉 智深: "剛性劣化の静的離散化構造同定法に関する未測定変位の予想アルゴリズム" 計算工学講演会論文集. Vol. 3. 531-534 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 呉 智深, 原田 隆郎, 三宅 博之: "固有振動特性による大型構造システムの分散化劣化診断同定に関する研究" 構造物の診断に関するシンポジウム論文集. 27-32 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yin, J., Wu, Z.S.: "Interface crack propagation in FRP-strengthening concrete structures using nonlinear fracture mechanics" Proc. of 4th Int. Symposiumu on Fiber Reinforced Polymer for Reinforced Concrete Structures. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 金沢 勝治, 呉 智深, Yunping Xi: "マルコフモデルによるコンクリート引っ張りクラックのランダム成長に関する研究" コンクリート工学年次論文報告集. Vol.21. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wang, H., Li, J., Lu, Q., Liu, J.Zhai, Z.: "Detecting of subsurface Defects in CFRP with Infrared Thermography" Proc. of CMS Conf. '98. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Zhou, P., Tanabe, K.and Nishizawa, O.: "Study on Debond Detection of Carbon Fiber Sheets using Non-Contacting Laser Vibrometer System" Proc.of JSCE Symposium of Repair and Strengthening Design and Construction of Concrete Structures. 51-59 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Tanabe, K., Matsuzaki, T., Fukuzawa, K.and Kanda, T.: "Strengthening property of RC Beams with Prestressed Carbon Fiber Sheets" Proc.of JCI Symposium on Concrete Structures Strengthened with Continuous Fiber. 67-74 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Matsuzaki, T.and Tanabe, K.: "Experimental Investigation Concerning Fracture Mechanism of Concrete Beams Reinforced by FRP Sheet" Proc.of JCI Symposium on Concrete Structures Strengthened with Continuous Fiber. 119-126 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Zhou, P., Wu, Z.S., Tanabe, K.and Nishizawa, O.: "Detection of interfacial defect along concrete-CFRP sheet interface by Laser Vibrometer system" Proc.of JSCE Symposium on Structural Diagnostics. 289-292 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Yin, J.and Asakura, T.: "Fracturing Response Simulation of FRP-Reinforced Concrete Beams by mixed Finite Elements" Journal of Applied Mechanics JSCE. Vol.1. 337-344 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shirai, N., Wu, Z.S.and Harada, T.: "Active vibration control for multi-mass shear system by using neural network" Proceedings of the 53th Annual conference of the JSCE. I-B475. 950-951 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hasebe, T., Wu, Z.S.and Takahashi, M.: "Monitoring for damage in brittle structures using impedance approach" Proceedings of the 53th Annual conference of the JSCE. V-86. 172-173 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Chen, T., Wang B., Cen, Z.and Wu, Z.S.: "Cohesive crack analysis by Galerkin Boundary element method" Proc.8th China-Japan Symposium on Boundary Element Method. 67-76 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y Chen, T., Wang B., Cen, Z.and Wu, Z.S.: "A symmetric Galerkin Multi-zone BEM for cohesive crack growth" Int.J.Engineering Fracture Mechanics. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Sasaki, Y., Harada, T.and Iwamatsu, S.: "Development of descretilized parameter estimation method of deteriorating structures using hopfield neural network" Proceedings of the Conference on Computational Engineering and Science. Vol.2. 781-784 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hasebe, T., Wu, Z.S., Takahashi, M.and Tanabe, K.: "Actuator characteristic of piezo sensor influence destruction fragility experimental study" Proceeding of the 52th Annual conference of the JSCE. V-137. 274-275 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yao, Z.and Qu, S.: "Identification of the material parameters of laminated plates" Inverse Problems in Engineering Mechanics. 179-185 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S.and Yin, J.: "Analysis of Mixed-Mode Brittle Fractures by Mixed Finite Element with Internal Displacement Discontinuities" Proceedings of the Conference on Computational Engineering and Science. Vol.3. 841-844 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Ichiki, S.and Wu, Z.S.: "Prediction algorithm of unmesured displacements for descretilized parameter estimation on stiffness deterioration" Proceedings of the Conference on Computational Engineering and Science. Vol.3. 531-534 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wu, Z.S., Harada, T.and Miyake, H.: "Study on Decomposition Identification of Damaged Structures using Naural Frequency Characteristics" Proc.of JSCE Symposium on Structural Diagnostics. 27-32 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yin, J.and Wu, Z.S.: "Interface crack propagation in FRP-strengthening concrete structures using nonlinear fracture mechanics" Proc.of 4th Int. Symposium on Fiber Reinforced Polymer for Reinforced Concrete Structures. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kanazawa, K., Wu, Z.S.and Xi, Y.: "Random crack growth of concrete by markov process model" Proceedings of the Japan Concrete Institute. Vol.21. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wang, H., Li, J., Lu, Q., Liu, J.and Zhai, Z.: "Detecting of subsurface Defects in CFRP with Infrared Thermography" Proc.of CMS Conf. '98. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 呉 智深,周 平,田名部菊次郎,西澤 修: "非接触レーザー振動計測システムによる炭素繊維シートの剥離の測定法に関する研究" 土木学会コンクリート構造物の補強設計に関するシンポジウム論文集. 51-59 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 呉 智深,田名部菊次郎,松崎智優,福沢公夫,神田 建: "炭素繊維シート緊張接着による鉄筋コンクリート梁部材の補強特性" 日本コンクリート工学協会連続繊維補強コンクリートに関するシンポジウム論文集. 67-74 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 呉 智深,松崎智優,田名部菊次郎: "FRPシート補強コンクリート梁の破壊メカニズムに関する実験的研究" 日本コンクリート工学協会連続繊維補強コンクリートに関するシンポジウム論文集. 119-126 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 周 平,呉 智深,田名部菊次郎,西澤 修: "非接触レーザー速度計による炭素繊維シートの接着浮きの検査手法に関する研究" 土木学会構造物の診断に関するシンポジウム論文集. 289-292 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Wu,Z.S.,Yin,J.and Asakura,T.: "Fracturing Response Simulation of FRP-Reinforced Concrete Beames by Mixed Finite Elements" Journal of Applied Mechanics. Vol.1. 337-344 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 白井奈津子,呉 智深,原田隆郎: "階層型ニューラルネットワークを用いたせん断質点システムの振動制御に関する研究" 土木学会第53回年次学術講演会講演概要集. I-B475. 950-951 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長谷部崇,呉 智深,高橋学: "圧電セラミックスアクチュエータの振動変化による脆性構造体内部の損傷のモニタリングに関する研究" 土木学会第53回年次学術講演会講演概要集. V-86. 172-173 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Chen,T.,Wang B.,Cen,Z.and Wu,Z.S: "Cohesive crack analysis by Galerkin Boundary element method" Proc.8th China-Japan Symposium on Boundary Element Methods. 67-76 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Chen,T.,Wang B.,Cen,Z.and Wu,Z.S: "A symmetric Galerkin Multi-zone BEM for cohesive crack growth" Int.J.Engineering Fracture Mechanics. (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 金沢 勝治, 呉 智深, 岩松 幸雄: "時系列信頼性解析による脆弱構造システムの破壊プロセスに関する研究" 土木学会第52回年次学術講演会・講演概要集. IA-150. 298-299 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 阿部 勇, 呉 智深, 高橋 学, 田名部 菊次郎: "圧電セラミックスのアクチュエータ特性による脆性体の破壊現象に及ぼす影響に関する実験的研究" 土木学会第52回年次学術講演会・講演概要集. V-137. 274-275 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 呉 智深, 周 平, 田名部 菊次郎, 西澤 修: "非接触レーザー振動計測システムによる炭素繊維シートの剥離の測定法に関する研究" コンクリート構造物の補強設計に関するシンポジウム論文集. (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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