Developing a Lateral Load Pattern for Pushover Analysis of EBF System

Abstract

Finding an appropriate system to absorb the intended energy of the earthquake is of great importance in seismic region. The eccentric bracing frame (EBF) is one of the structural systems that reveal proper behavior during earthquakes phenomenon. In doing so, design codes attempt to optimize EBF seismic behave to avoid failure of the earthquake regarding a set of the criteria. Indeed, the dynamic nonlinear approaches are the most powerful methods which solve the motion equations based on the time history of the ground motion. However, the dynamic nonlinear methods require a rigorous effort to nail the structural responses. Therefore, there is a need to develop a simplified approach such a pushover method which is based on the non-linear static analysis. The main attempt of this research is to present a simplified push overload pattern for EBF system to sufficiently divulge the structural performance subjected to the seismic loadings. In this investigation, three models of the middle rise and tall rise, 10, 20, 30 stories of buildings are considered, which are designed according to the available codes. Accordingly, several different load patterns are developed. The idea behind of each proposed load patterns inspired by the deflection of a rod subjected to the flame. Herein, the meaning of the flame refers to the region of the structures which is subjected to the plastic hinges.