Performance-based Seismic Design Of Steel Moment Frames-Yield Point Spectra Method

The primary objective of most codes for seismic design of buildings has been to safeguard against loss of life. Others objectives such as maintaining function, limiting damage or providing for easy repair were not explicitly addressed in these provisions. The constructions that designed according to the current seismic design code can avoid collapsed and ensure the life safety of the public under strong earthquake, but the caused economic losses is very large. No realistic quantification of the nonlinear characteristic of the structure during the traditional design is done is the main reason that leading to a great economic losses. Based on the acquaintance given above, the idea of performance-based seismic design was increased.Yield Point Spectra is a new constant ductility response spectrum with displacement-acceleration format. For design, YPS can be used to obtain the minimum lateral strength required to limit peak roof displacement and ductility to arbitrary values for design earthquakes. In this paper, three steel moment frames of there, six, nine stories are designed based on YPS method. The actual values of yield displacement and the peak displacement and interstory drifts of the frames was evaluated based on pushover method and nonlinear time history method. Nonlinear static and dynamic analyses of each frame were done to verify if the proposed design methodology achieves the design objectives and to evaluate the applicability of the YPS method .