Direct displacement-based design method of seismic resilient multiple-rocking-column steel frame

Abstract

The multiple-rocking-column steel frame (MRCSF) proposed by the authors is a seismic resilient system that can be constructed economically to achieve low-damage and self-centering. It consists of continuous beams, segmental columns and self-centering friction rocking joints. The direct displacement-based design (DDBD) method of the system is investigated, including the definition of displacement objectives, the equivalent linearization of the MRCSF, and the design of self-centering friction rocking joints. This method builds upon the traditional force-based design method for frequent earthquakes and extends to performance-based design for maximum considered earthquakes. The columns do not rock under frequent earthquakes and are expected to rock or uplift with friction joints dissipating energy under design-basis and maximum considered earthquakes. By utilizing the established numerical analysis model, the effectiveness of the proposed direct displacement-based design method was validated through two example structures.