SEISMIC ENERGY RESPONSE OF TEN-STORY STEEL ROCKING FRAMES WITH COLUMN MID-HEIGHT UPLIFT AT FIRST STORY

Abstract eng:
Lessons learned from past earthquake damage suggest the potential benefit of rocking systems that reduce earthquake damage. This paper evaluates a structural system that achieves a rocking mechanism by permitting uplift at the mid-height of the first-story columns (CMU system). Steel dampers installed in these columns dissipate the seismic energy and reduce deformation. Suggested system is compared with corresponding ordinary frame without rocking mechanism (Fixed system) in the view of energy response. For the ground motions examined in this study, the seismic energy input to the CMU system was 0.6 to 2.2 times that to the Fixed system, while the energy dissipated by the steel system was significantly smaller (0 to 57%) in the CMU system than in the Fixed system.

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