• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Damage Monitoring Using Fiber Optic Sensors For The Joints Of Fiber Reinforced Polymer Structures

Research Project

Project/Area Number 15560492
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionToyohashi University of Technology

Principal Investigator

YAMADA Seishi  Toyohashi University of Technology, Faculty of Engineering, Department of Architecture and Civil Engineering, Associate Professor, 工学部, 助教授 (50134028)

Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsfiber reinforced polymer / fiber optic sensor / joint / fiber Bragg grating sensor / monitoring / micro crack / 損傷モニタリング / 振動計測 / FRP構造
Research Abstract

Civil structures are the most important facilities for human activity, however, they usually have strong impacts to the environment of the earth. An alternative solution for this problem would be to use the maintenance-free long-lived, fiber reinforced polymer(FRP) composites which have high corrosion resistant, light weight and high strength characteristics. Actually, many FRP bridges and FRP framed architectural structures have recently reported The long-lived FRP structure is very attractive to do the periodical inspection of structural health and the damage identification after various natural disasters under the use of an innovative optical fiber sensors. The girders of Taylor Bridge in Canada have been reinforced with FRP material and installed fiber optic sensors.
In this study, fiber Bragg grating(FBG) sensors were embedded in FRP structural members. First, the longitudinal tensile test of pultruded FRP strips have been performed and shown that the strain response measured with FBG sensors installed into the members is approximately the same as that with conventional strain gauges pasted on the surface of the members. Second, the longitudinal tensile tests of the bolted lap joints have been carried out ; the no-torque condition or a 45 N m torque has been adopted and the effects of frictional resistance have been discussed. Third, the FBG sensors were embedded beside the bolt on the transverse direction tension tests of the joints between a FRP structural member and a non-structural member using bolts. It is shown that the optical power decreases as the load increases, and its shape has two peaks after reaching at a critical load. When optical power spectrum has two peaks, the FBG becomes two different FBGs due to the occurrences of small transverse cracks inside the FRP material under locally large stress concentration beside the joint bolt.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (1 results)

All 2003

All Journal Article (1 results)

  • [Journal Article] Hearth monitoring of long-lived structural members reinforced with fiber multi-axial netting polymer layers having fiber optic sensors2003

    • Author(s)
      Yamada, S., Nakazawa, H.Y., Komiya, I.
    • Journal Title

      Advancement of Material and Processing Engineering, SAMPE

      Pages: 183-186

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary

URL: 

Published: 2003-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi