Abstract
Concentrically and eccentrically brace frames are two types of steel bracing used as a lateral load resisting system to improve the stiffness of the frame against earthquakes. The primary difference lies in how their members connect and how they dissipate energy during a seismic event. In this study, two types of bracing systems, eccentrically inverted V-brace frames (EBFs) and concentrically inverted V-brace frames (CBFs) for steel buildings are analyzed using the ETABS program. Nonlinear static (pushover) analysis (NSP) were performed then developing fragility curves in terms of spectral displacements. Fragility curves used to quantify how these two different bracing systems affect a model’s vulnerability. In addition, was investigated the story drift and forming of plastic hinges for the two systems. From the results, it can be noticed that the eccentrically inverted V- brace frames (EBFs) more ductile than concentrically inverted V-brace frames (CBFs) and could withstand in seismic action design. For instance the probability of the complete damage state 50%, the spectral displacement of the EBFs is higher about 63 % as compared with the CBFs.