A SEISMIC PERFORMANCE STUDY ON BEAM-TO-COLUMN CONNECTIONS WITH BEAM-END HORIZONTAL HAUNCH OF STEEL FRAME

摘要

This paper presents an experimental study on four one-half scale models which are beam-to-column connections with beam-end horizontal haunch. Test results include the yielding phenomenon, ultimate load, hysteretic curves, skeleton curves, ductility and energy dissipation capacity of connections respectively with side-plate reinforced connection and widen flange connection under low cyclic loading. A conventional specimen was also designed for comparison. The results demonstrated that all the beam-to-column connections with beam-end horizontal haunch fully satisfy the demand of special moment resistant frames, but the brittle failure on the weld of the conventional connection restricted its plastic property. The side-plate reinforced connections have a worse ductility due to the heat effect of the weld which connects the side plates and the beam flanges, it caused brittle tear of heat affected zone beam flanges which out of the reinforced part. The seismic performance of connections with widen flange connection is better than the side-plate reinforced connection, thus, it's suggested for satisfying the demand of plastic deformation and energy dissipation capacity in practical projects.