Lateral Load Patterns For Seismic Design of Moment-Resisting Frame Structures

This study deals with the development of lateral load patterns for the conceptual seismic design of moment-resisting frame structures. The proposed lateral load patterns are based on inelastic behavior and are a fundamental component of a proposed seismic design methodology to limit the extent of structural damage in the system and distribute this damage uniformly along the height. These load patterns are expected to provide uniform distribution of story ductility ratios when compared to the distributions obtained with moment-resisting frames designed based on the code-compliant design lateral load pattern -s. The implementation of the aforementioned methodology would not only distribute damage along the height of the frame، but also help avoid undesirable dynamic responses that occur once structural damage is concentrated in one or in a few astories، e. g.، story drift amplifications caused by P- delta effects. The proposed design lateral load patterns are a function of the fundamental period of the structural system، the target level of inelastic behavior (or damage)، the total height of structures، and the frequency content of the ground motions.