TY - GEN
T1 - Seismic upgrading of steel moment connections using double-shear-tab details
AU - Chang, Heui Yung
AU - Liao, Chu Tsen
AU - Yeh, Ching Yu
AU - Lai, Chi Ming
N1 - Publisher Copyright:
Copyright © 2018 by The Hong Kong Institute of Steel Construction.
PY - 2020
Y1 - 2020
N2 - Steel moment connections with pre-Northridge details usually have difficulties developing a total rotation equal to 4% rad or more. There appears to be a necessity of improving the deformation capacity of the connections. However, the issue still did not receive much attention. To meet the needs of seismic upgrading, a series of full-scale tests have been carried out with SN490B steel beam-to-column connections enhanced with double shear tabs and super high strength bolts F14T. In detail, the connection of double shear tabs bolted to a beam web was tested first. That helps confirm the slip coefficient of high strength bolts. The beam flanges were then welded to the column and the connection were tested. The bolts were confirmed to have an average slip coefficient of 0.43. After correcting for the loss of pretension, the coefficient will get greater than 0.45, the value recommended by AIJ. The connection test stopped for the fracture occurring at the upper beam flange. The connection develops a deformation capacity more than 4%, but fails repeating the 2nd loading cycle in the AISC pre-qualification test. The result has shown a possibility of enhancing the connection deformation capacity using the double-shear-tab detail. That also suggest more attention be paid to connection details.
AB - Steel moment connections with pre-Northridge details usually have difficulties developing a total rotation equal to 4% rad or more. There appears to be a necessity of improving the deformation capacity of the connections. However, the issue still did not receive much attention. To meet the needs of seismic upgrading, a series of full-scale tests have been carried out with SN490B steel beam-to-column connections enhanced with double shear tabs and super high strength bolts F14T. In detail, the connection of double shear tabs bolted to a beam web was tested first. That helps confirm the slip coefficient of high strength bolts. The beam flanges were then welded to the column and the connection were tested. The bolts were confirmed to have an average slip coefficient of 0.43. After correcting for the loss of pretension, the coefficient will get greater than 0.45, the value recommended by AIJ. The connection test stopped for the fracture occurring at the upper beam flange. The connection develops a deformation capacity more than 4%, but fails repeating the 2nd loading cycle in the AISC pre-qualification test. The result has shown a possibility of enhancing the connection deformation capacity using the double-shear-tab detail. That also suggest more attention be paid to connection details.
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U2 - 10.18057/ICASS2018.P.142
DO - 10.18057/ICASS2018.P.142
M3 - Conference contribution
AN - SCOPUS:85084953823
T3 - Proceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018
BT - Proceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018
A2 - Chan, Siu Lai
A2 - Chan, Tak-Ming
A2 - Zhu, Songye
PB - Hong Kong Institution of Steel Construction
T2 - 9th International Conference on Advances in Steel Structures, ICASS 2018
Y2 - 5 December 2018 through 7 December 2018
ER -