Steel and Composite Structures

  • 제49권6호
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  • Pages.685-699
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  • 2023
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Damping characteristics of CFRP strengthened castellated beams

  • 투고 : 2021.06.21
  • 심사 : 2023.09.12
  • 발행 : 2023.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

In recent years, Carbon Fibre Reinforced Plastic (CFRP) strengthening is found to be one of the best methods to strengthen steel structures. The fibrous bond can also influence the vibration characteristics of the strengthened element apart from its static strength enhancement property. The main objective of this study is to understand the influence of CFRP strengthening on the dynamic Behaviour of Thin-Webbed Castellated Beams (TWCBs). A detailed experimental investigation was carried out on five sets of beams with varying parameters such as domination of shear (Shear Dominant, Moment Dominant and Moment and Shear Dominant), sectional classification (Plastic and Semi-compact) and perforation geometries (ho/dwratio 0.65 and e/ho ratio 0.3). Free vibration analysis was carried out by exciting the simply supported TWCBs with an impact force generated by a ball dropped from a specific height. Logarithmic decrement method was used to obtain the damping ratio and natural frequencies of vibration were found by Fast Fourier Transform (FFT). Natural frequency showed an increase in a range of 10.5 - 55% for the different sets of castellated beams. An increase of 62.30% was noted in the damping ratio of TWCBs after strengthening which is an indication of improvement in the vibration characteristics of the beam.

키워드

과제정보

The authors gratefully acknowledge the financial support by the National Institute of Technology, Tiruchirappalli provided through the Technical Education Quality Improvement Program (TEQIP) Phase II Scheme. The authors thankfully acknowledge all the Managers and Technicians of FOSROC Chemicals (India) Pvt. Limited, Bangalore for offering the CFRP (Nitowrap CF200) and Epoxies (Nitowrap 30 and Nitowrap 410) for this study and for the preparation of this paper.

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