ABSTRACT
Optimization is beginning to be used with nonlinear time history analyses. This approach is more computationally demanding, but may provide more meaningful results. Lagaros et al. (2006) investigated optimized designs of a steel moment frame considering both linear analysis methods and non-linear time history analysis. Ohsaki et al. (2007) used non linear time history analysis with three ground motions and a multiobjective formulation to minimize structural volume and maximize plastic energy dissipation at the collapse state for a steel moment frame. Balling et al. (2009) optimized low-rise BRBFs using nonlinear time history analyses under a suite of earthquakes and compared results with designs obtained from the equivalent lateral force procedure.
