TY - JOUR
T1 - Strengthening of Laterally Restrained Steel Beams Subjected to Flexural Loading Using Low-Modulus CFRP
AU - Selvaraj, Sivaganesh
AU - Madhavan, Mahendrakumar
N1 - Funding 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.
Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Upgrading the flexural design strength of the structural member for increased live load without disrupting the functionality of the structure is an arduous task. One such problem was investigated in this study by using low-modulus (<125 GPa) carbon fiber-reinforced polymer (CFRP) for retrofitting of structural steel members. Although most researchers use normal (up to 250 GPa) or high-modulus (above 250-640 GPa) CFRP for flexural strengthening of steel structures, the use of low-modulus CFRP for such applications has been largely unexplored. The present study demonstrated the feasibility of low-modulus CFRP by experimental testing using different retrofitting techniques such as flange wrap, flange-web wrap, and closed wrap. A total of 18 steel beams were tested under four-point bending that includes two control specimens and 16 CFRP-strengthened specimens. In each strengthening scheme, enhanced CFRP wrapping configurations were introduced based on the failure modes observed from the previous wrapping configurations, thereby the strength, as well as the failure mode, improved. In general, the experimental results indicate that the design strength of the structural steel member subjected to flexural loading can be increased up to ∼50% by using the low-modulus CFRP strengthening schemes.
AB - Upgrading the flexural design strength of the structural member for increased live load without disrupting the functionality of the structure is an arduous task. One such problem was investigated in this study by using low-modulus (<125 GPa) carbon fiber-reinforced polymer (CFRP) for retrofitting of structural steel members. Although most researchers use normal (up to 250 GPa) or high-modulus (above 250-640 GPa) CFRP for flexural strengthening of steel structures, the use of low-modulus CFRP for such applications has been largely unexplored. The present study demonstrated the feasibility of low-modulus CFRP by experimental testing using different retrofitting techniques such as flange wrap, flange-web wrap, and closed wrap. A total of 18 steel beams were tested under four-point bending that includes two control specimens and 16 CFRP-strengthened specimens. In each strengthening scheme, enhanced CFRP wrapping configurations were introduced based on the failure modes observed from the previous wrapping configurations, thereby the strength, as well as the failure mode, improved. In general, the experimental results indicate that the design strength of the structural steel member subjected to flexural loading can be increased up to ∼50% by using the low-modulus CFRP strengthening schemes.
KW - Carbon fiber-reinforced polymer (CFRP) strengthening
KW - Flexural loading
KW - Low modulus (< 125 GPa)
KW - Performance enhancement
KW - Steel structures
UR - http://www.scopus.com/inward/record.url?scp=85063136248&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CF.1943-5509.0001293
DO - 10.1061/(ASCE)CF.1943-5509.0001293
M3 - Journal article
AN - SCOPUS:85063136248
SN - 0887-3828
VL - 33
JO - Journal of Performance of Constructed Facilities
JF - Journal of Performance of Constructed Facilities
IS - 3
M1 - 04019032
ER -