Title:
Cyclic Response of Exterior Beam-Column Joints with Different Anchorage Methods
Author(s):
Hung-Jen Lee and Si-Ying Yu
Publication:
Structural Journal
Volume:
106
Issue:
3
Appears on pages(s):
329-339
Keywords:
anchorage; beam-column joint; connection; headed bar; seismic design.
DOI:
10.14359/56497
Date:
5/1/2009
Abstract:
This paper presents the cyclic response of six exterior beamcolumn joints with or without eccentricity to evaluate the use of mechanical anchorages in place of hooked bar anchorages. In high seismic zones, the hooked beam bars often cause steel congestion in a joint at building corners. From previous tests of beam-column joints, the use of mechanical anchorages in place of hooked bar anchorages provides a promising solution for steel congestion, but it has not been verified in eccentric beam-column joints. The presented experimental program demonstrates that eccentric beam-column joints with mechanical anchorages can exhibit satisfactory performance and adequate anchorage capacity for a limiting drift ratio. Extending ACI design methods to cover the use of mechanical anchorages for eccentric beam-column joints is an appropriate code modification. Test results also indicate that the cyclic behavior of exterior beam-column joints can be significantly improved by attaching double mechanical devices on each beam bar within the joint.