Overstrength and Ductility Factors for Steel Frames Designed According to BS 5950

Abstract

Buildings sited outside the seismic zones such as those in Singapore are not designed for seismic loads. However, the buildings in these regions vibrate due to tremors caused by faults in Sumatra, Indonesia. Therefore, in order to assess the vulnerability of these buildings under low-seismic excitation, it is important to determine the overstrength and ductility of these buildings designed for gravity loads and wind loads or notional horizontal load. In this study, steel frames of three-, six- and ten-story three-bay moment resisting frames (MRFs), concentrically braced frames (CBFs), and semirigid frames are designed according to BS 5950, which does not have any seismic provisions. A nonlinear push-over analysis involving