LAUSR

Abstract To implement the energy-based seismic design, it is important to quantify the energy dissipation within a structure. This paper evaluates the hysteretic energy demand (EH) within self-centering concrete frames (SCCF) with hybrid joints. Twelve SCCFs with different stories and self-centering parameters λ were designed. Two-dimensional analytical models were developed in OpenSees and subjected to forty-four far-field ground motions to assess the energy distribution within structures. The result shows that SCCF dissipating input energy (EI) depends mainly on the hysteresis of the beam-column joints and column bases at the first floor. The proportions of EH within different components are closely related to the peak ground acceleration (PGA) and the self-centering parameter λ defined in this paper. EH in middle floors decreases proportional to the PGA, while EH in upper floors changes reversely. Meanwhile, EH tends to distribute more evenly along the height in frames with more stories. Finally, empirical equations to quantify the distribution of EH within self-centering structures are proposed. The results show that the proposed approaches can be adopted to conservatively estimate the distribution of EH for SCCFs with hybrid joints.