Experimental study of semi-rigid composite end-plate connections under cyclic loading

The experimental results of three full scale composite joint sub-assemblages (two interior and one exterior joints) under cyclic loading are presented. At the beam-to-column connections, the composite beams were bolt-connected to universal columns through flush end-plates, and continuous rebars were provided in the composite slab. The hysteretic curves of the connection nodal zones of the test specimens are stable and exhibit ductile performance. Failure occurred first in concrete slabs which governed the ultimate moment capacity of the connections. Due to the unbalanced beam moments, the panel zone bore severe shear distortion and left significant residual deformation. Therefore particular attention should be paid to strengthening of the panel zone under cyclic loading.