Numerical Simulation of Beam to Concrete Filled Tube Column Joints with External Diaphragm

Beam-column joint assemblage in the moment-resisting framed structures is a critical seismic element because its behavior under severe earthquake motions has a significant effect on failure mode, strength and deformation capacity of the building structures. In this paper, the numerical simulations of beam to CFT (Concrete filled tube) high strength joints with external diaphragm are investigated using Finite element software ANSYS. The two joint typologies beams with reduced beam section (RBS) and with cover plates (CP) are studied. To investigate the seismic analyses the joints are tested under monotonic and cyclic loading. The parametric studies include influence of different length of cover plates and the transient analysis of RBS joint and CP joints. The joints with cover plate show higher seismic resistance than reduced beam section. As the length of cover plate increases the strength of joint increases. So these joints are suitable in seismic regions.