Experimental study of a hybrid structural damper for multi-seismic levels

Abstract

Passive energy-dissipating devices or dampers applied as structural fuses are appealing alternatives to traditional earthquake-resisting design approaches. In this paper, two dual-performance designs are introduced as alternatives to the standard steel-plate yielding and friction damper. The new devices are detailed and designed to absorb and dissipate seismic input energy at different levels of ground motion. Both systems are composed of a main fuse to dissipate energy at high-level drift demands encountered in severe earthquakes but also have an auxiliary fuse to control the responses at lower drift demands that normally occur in moderate earthquakes. Six specimens with different specifications were designed and tested. The experimental results prove the efficiency of the dampers at different levels of ground motion. In moderate-level ground motion intensities, the dual-performance characteristics of the dampers permit energy dissipation in the auxiliary fuse without disturbing the main fuse. In high-intensity ground motions, the main fuses are engaged with significant energy-dissipating capability. Moreover, significant enhancements were observed in the plastic rotation capacity of the dampers and the ductility provided. A finite-element model of the dampers was created and close agreement was observed between the numerical and experimental results.

Multi‐level enhancement of structural behavior of bracing systems with coupling beams at floor level

“…Maleki and Mahjoubi introduced a dual‐pipe damper, which primarily dissipates energy through flexure and develops added stiffness and strength via a tension diagonal at larger displacements 31 . Hosseini Hashemi and Moaddab introduced the modified TADAS damper with dual performance, as well as the dual performance combined friction damper and TADAS damper 32 . Their systems incorporate a primary fuse that dissipates energy during severe earthquakes, along with an auxiliary fuse that controls responses during lower drift demands typically seen in moderate earthquakes.…”

“…31 Hosseini Hashemi and Moaddab introduced the modified TADAS damper with dual performance, as well as the dual performance combined friction damper and TADAS damper. 32 Their systems incorporate a primary fuse that dissipates energy during severe earthquakes, along with an auxiliary fuse that controls responses during lower drift demands typically seen in moderate earthquakes.…”

Editorial

“…All retrofitted joint specimens failed in a ductile mode of beam flexural failure, whereas the control specimen failed in a brittle mode of joint shear failure. In addition, the energy dissipation capacity as well as ductility of the retrofitted joint specimens was enhanced significantly.The second paper presents the hybrid structural damper for multi-seismic levels (Hosseini Hashemi and Moaddab, 2017). In this paper two dual-performance designs are introduced as alternatives to the standard steel-plate yielding and friction damper.…”

“…The second paper presents the hybrid structural damper for multi-seismic levels (Hosseini Hashemi and Moaddab, 2017). In this paper two dual-performance designs are introduced as alternatives to the standard steel-plate yielding and friction damper.…”