5-7 December 2018 - Hong Kong, China

CONFERENCE PAPERS

Ninth International Conference on Advances in Steel Structures (ICASS 2018)


SEISMIC UPGRADING OF STEEL MOMENT CONNECTIONS USING DOUBLE-SHEAR-TAB DETAILS

 

Heui-Yung Chang 1*, Chu-Tsen Liao 2, Ching-Yu Yeh 3, and Chi-Ming Lai 3

1 Department of Civil and Environmental Engineering, National Kaohsiung University, Kaohsiung, Taiwan

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2 Department of Creative Design and Architecture, National Kaohsiung University, Kaohsiung, Taiwan

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3 Department of Civil Engineering, National Cheng Kung University, Tainan, Taiwan

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DOI:10.18057/ICASS2018.P.142

ABSTRACT:

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.

Keywords:

Double shear tabs; Super high strength bolt (F14T); Steel beam-to-column connection; Connection test; seismic upgrading

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IMPORTANT DATES

First call for paper:
1 January 2018
Abstract submission: (CLOSED)
1 April 2018
Notification of abstract acceptance:
on or before 16 April 2018 
Full paper submission: 
15 July 2018
Online Registration Begins:
1 August 2018
Notification of full paper acceptance:
31 August 2018
Early bird registration:
on or before 7 September 2018
Online Registration Closes:
31 October 2018
Announcement of programme:
1 November 2018
ICASS2018 December 05, 2018 08:00 AM Time's Up