The static and dynamic seismic design of multi-layer buckling restraint braced steel frame

For the aim to simplify the dynamic analysis responses of multi-storey steel frame structure under strong earthquake, the level participation ratio beta of buckling restrained brace (BRB) as the main research, 6 multi buckling restrained braced frame (BRBF) models were established, and evaluate formula was given based on energy and story displacement. The results revealed that the static analysis responses of story displacement, shear and the energy distribution of buckling restrained brace and the relationship of hysteretic curve are in agreement with the dynamic when the level participation ratio beta between 20% and 60%. So the static analysis value can evaluate the value of seismic response accurate under strong earthquake when the frame was designed with fixed equivalent base shear method and the level participation ratio beta between 20% and 60%.