Abstract
This paper presents the cyclic response of six exterior beam-column 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 comers. 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.
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