Assessment of fragility curve for steel frame construction under different categories of earthquakes

The aim of this study is to investigate the effect two categories earthquake events on fragility curves steel building construction (structures with different number stories) by considering relative lateral displacement as a damage criterion. used describe change in position were chosen be slight, moderate, extensive, and complete. Increased seismic demand increases probability exceeding. In other words, greater maximum acceleration, higher exceeding (PoE). 3-story structure, increase PGA PoE structure at extensive failure levels. for 2nd category earthquakes show shift from sleeping mode (gradual increase) standing state (rapid compared 1st-class 5-story model. Increasing stories large failures. 7-story model was 10 15.5 % than that 5- models, respectively. However, complete state, 6 7 more 7- Therefore, it can concluded increasing PoE, but evident level.