System approach of modeling of high rise steel structures against earthquake excitations

The ability of structural steel as a base material to dissipate large amount of seismic energy through inelastic deformations makes steel a material ideally suited for structures undergoing seismic excitations. The performance of a structure during a seismic event depends on many sources of randomness such as intensity and dynamic characteristics of ground motions, the material mechanical properties, the hysteretic behavior of dissipative elements, connections etc. The probabilistic approach can fully consider all of the uncertainties affecting the prediction of the seismic behavior and, therefore the actual seismic performance. In this work a system approach is explained for mathematical model of high rise steel structures against seismic excitations. An objective function has been defined relating a criterion variable to the vector of unknowns and predictor variables encountered in a time history response of steel structure.