Response sensitivity analysis of steel frames with buckling-restrained braces

This work illustrates some applications of nonlinear dynamic response sensitivity analysis to steel frame structures equipped with buckling-restrained braces (BRBs). A realistic 4-storey steel frame equipped with buckling-restrained V-bracings subjected to a set of seismic ground motions is used as benchmark problem. BRB internal core areas are assumed as sensitivity parameters and inter-storey drifts are chosen as engineering demand parameters. The worst possible combination of parameter variations is individuated and the reduction of the seismic performance as a function of the parameter variation amplitude is estimated for the benchmark problem.