Analysis Of Anti-Seismic Capability Of Ebsf Used In High Buildings

As a new structural system, high-rise building of eccentrically braced steel frame has been growing fast in recent years. When an earthquake is coming, the active beam link of an eccentrically braced steel frame(EBSF) becomes plastic earlier, then it consumes the energy of earthquake by it's plastic deformation and accordingly the internal force of other components such as columns, beams and braces will be reduced, so that the whole structure will be much more safe. The article analyzes the seismic capacity of eccentrically braced steel frame from the length of the link beam and eccentric forms.Some relevant examples are presented about different lengths of active beam link and different types of EBSF by finite element analytical software SAP2000. Through nonlinear dynamic analysis under seismic load, we find that the non-elastic properties of active beam link has a very close relationship with its length. The smaller the length of the link beam, the higher stiffness and the worse ductility. So it is very important to choose reasonable the length of active beam link and the proposal is recommended. In addition, we find the stiffness of K-type eccentrically braced steel frame is greater than other forms, V-second and D-min. Eccentrically braced steel frame has better seismic superiority than central braced steel frame(CBSF).