Han and Li 2010
This paper researches and experiments the seismic effect on both concrete filled steel tubes (CFTs) and steel beam with reinforced concrete slab (RC).
Experimental Study, Results, and Discussion
A combination of beams and columns were tested with axial compression on top of the columns, and cyclic loads at the ends of the beams to investigate the influence of interior and exterior joints. The main parameter for these experiments was joint type (interior vs. exterior), load, and the width of the specimens. The concrete was prepared without vibration, and was used to fill the interior of the steel tubes before a hydraulic jack was used to apply a constant axial load. The ends of the column were restrained from horizontal motion, although they were allowed to rotate. For the interior joints, it is seen that the presence of an RC increases the strength of a beam, and that the top of the flanges underwent the least amount of damage due to additional support from the RC. The specimens with a dominant beam failure displayed the least amount of damage on the concrete core, however the specimens with column failure had visible cracking. The exterior joints provided much more strength, with a much higher maximum load and stiffness. Lastly, it is concluded that the strain is smaller for specimens with a larger steel section, as compared to the specimens with a smaller section.
Han, L., and Li, W. (2010) “Seismic Performance of CFST Column to Steel Beam Joint with RC Slab: Experiments.” Journal of Constructional Steel Research, 66 (11), November, pp. 1374–1386. doi:10.1016/j.jcsr.2010.05.003