Retrofitting of steel beams using low-modulus carbon fiber reinforced polymer laminates

Selvaraj, Sivaganesh and Madhavan, Mahendrakumar (2020) Retrofitting of steel beams using low-modulus carbon fiber reinforced polymer laminates. Journal of Constructional Steel Research, 167 (105825). pp. 1-16. ISSN 0143-974X (In Press)

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Abstract

A feasibility study on the use of low modulus (<125 GPa) carbon fiber reinforced polymer (CFRP) in the retrofitting schemes of structural steel beams subjected to flexural loading is presented. A various CFRP wrapping optimization methods were introduced namely tension flange strengthening and U-wrap strengthening. The result indicates that the strength of the member can be increased significantly by adopting the appropriate wrapping method. A simple theoretical calculation to estimate the design moment capacity of the CFRP strengthened steel member with the nonlinear material properties has been presented. Further, the design stress and strain values recommended in the current design provisions of ACI were validated with the test results and found to be unconservative. Therefore, a method to evaluate the design strain of a strengthened structural steel member using low modulus CFRP has been suggested from the present results. The reliability study based on the limited test results also indicates that the suggested elastic strain design limit state is reliable. For ease of understanding, a design example for predicting the design strength of the steel flexural member strengthened using low modulus CFRP has been provided.

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IITH Creators:

IITH Creators	ORCiD
Madhavan, Mahendrakumar	https://orcid.org/0000-0002-3144-5278

Item Type:

Article

Additional Information:

The investigation reported in this paper was funded by a research grant (SB/FTP/ETA-93/2013) from the Department of Science and Technology (DST), Government of India. The authors would like to gratefully acknowledge Pennar Engineered Building Systems Ltd. Hyderabad, India, for their help in fabricating the test specimens required for experimental investigation.

Uncontrolled Keywords:

Design limit states, Feasibility study, Low-modulus CFRP, Retrofitting, Wrapping optimization, Indexed in Scopus

Subjects:

Civil Engineering

Divisions:

Department of Civil Engineering

Depositing User:

Team Library

Date Deposited:

14 Jan 2020 04:36

Last Modified:

18 Nov 2022 05:15