Effects of Hysteretic Properties of Stud-Type Dampers on Seismic Performance of Steel Moment-Resisting Frame Buildings

Abstract

Stud-type damper devices (SDs), which are arranged vertically in frames by solely connecting beams in spans, are increasingly used in special moment-resisting frame (SMRF) systems in practice. The SDs are typically used to increase structural stiffness and energy dissipation for achieving better seismic performance of the systems when remaining a good architectural versatility in buildings. The dual system combining SDs in SMRFs is referred to as stud-type damper frames (SDFs) in this study. Various details of SDs forming different hysteric characteristics are available; however, how they affect the seismic performance of the systems is still unclear. This study presents an analytical investigation to clarify the advantages of adopting SDFs compared with their counterpart SMRFs, and the effect of each hysteretic property of SDs on the seismic performance at various seismic hazard levels. Three- and nine-story prototype buildings, representing low-rise and midrise buildings, respectively, with various hysteretic properties of SDs were analytically examined through nonlinear time-history analysis. A set of hysteretic properties of SDs was proposed, and was verified to significantly improve overall seismic performance of the buildings under small and frequent earthquakes and to effectively limit the residual interstory drifts under moderate-to-large earthquakes. A method was also developed to estimate the possible residual story drifts of the SDFs according to the ductility of the story.