application of constraint control method of optimization in seismic design of steel frames

In performance-based seismic design of structures, the main objective is to design the structure such that its performance is predictable under certain risk levels. in pbd, in addition to strength, other seismic performance parameters, such as ductility, stiffness and drift have a profound effect on the performance of the structure. in order to predict the performance of a structure (or structural component) subjected to a certain demand earthquake, its capacity curve should first be established. there are different methods of determining the capacity curve of a system, including: nonlinear static (pushover), cyclic or time-history dynamic loading analyses. the pushover analysis method is a practical method, which while being relatively simple, reasonably accurately estimates the seismic performance parameters of the structure and its components, such as ductility, behavior factor and toughness and can easily be utilized in optimization algorithms.