Incremental Dynamic Analyses Of Steel Moment Resisting...

Incremental Dynamic Analyses of Steel Moment Resisting Frames with Superelastic Viscous Dampers Baikuntha Silwal1, Osman E. Ozbulut1, Robert J. Michael2 1Department of Civil and Environmental Engineering, University of Virginia, Charlottesville, Virginia, USA 2Department of Mechanical Engineering, Gannon University, Erie, Pennsylvania, USA ABSTRACT This study aims to evaluate the seismic performance of steel moment resisting frames upgraded with shape memory alloy (SMA)-based self-centering viscous dampers. The superelastic viscous damper (SVD) relies on SMA cables for re-centering capability and employs viscoelastic (VE) damper that consists of two layers of a high damped (HD) blended butyl elastomer compound to augment its energy†¦show more content†¦In another study, Erochko et al. [3] examined the residual drift response of special moment-resisting frames (SMRFs) and buckling-restrained braced frames (BRBFs). It was found that both types of building systems experience significant residual drifts, with values between 0.8-1.5% for the SMRFs and 0.8-2.0% for the BRBFs under design-based excitations. By reducing residual drifts of a structure subjected to a seismic event, structural engineers can maximize post-event functionality, reduce the cost to repair the structures, and increase the public safety. A number of studies have been carried out to develop new structural systems that can provide stable energy dissipation with full re-centering capabilities. Often referred to as self-centering or re-centering, these systems provide a restoring force which is either independent from or acts in addition to energy dissipation capabilities. Christopoulos et al. [4] developed a self-centering energy dissipative bracing system, which combines a friction dissipative mechanism and post-tensioning elements. Experimental tests on the proposed full-scale bracing system were conducted to confirm the repeatable flag-shape hysteretic response. Deierlein et al. [5] proposed a new seismic resisting system that includes controlled rocking, elastic post-tensioning, and