Hysteretic–Viscous Hybrid Damper System for Long-Period Pulse-Type Earthquake Ground Motions of Large Amplitude

Abstract

This paper aims to develop a hysteretic-viscous hybrid (HVH) damper system for long-period pulse-type earthquake ground motions of large amplitude. Long-period pulse-type earthquake ground motions of large amplitude have been recorded recently (Northridge, 1994; Kumamoto, 2016). It is well-known that these ground motions could cause severe damage to high-rise and base-isolated buildings with long natural period. To mitigate the damage caused by such ground motion, a new viscous-hysteretic hybrid damper system is proposed here, which consists of a viscous damper with large stroke and a hysteretic damper including a gap mechanism. A double impulse is employed as a representative of long-period pulse-type earthquake ground motions of large amplitude and a closed-form maximum response to this double impulse is derived for an elastic-plastic SDOF system including the proposed HVH system. To reveal the effectiveness of the proposed HVH system, time-history response analyses are performed for an amplitude modulated double impulse and a recorded ground motion at Kumamoto (2016). The performance comparison with the previous dual hysteretic damper (DHD) system consisting of small-amplitude and large-amplitude hysteretic dampers in parallel is also conducted to investigate the effectiveness of the proposed HVH system.

Hysteretic-Viscous Hybrid Damper System With Stopper Mechanism for Tall Buildings Under Earthquake Ground Motions of Extremely Large Amplitude

“…A new hysteretic-viscous hybrid (HVH) damper system was proposed in the recent paper (Hashizume and Takewaki, 2020). In this damper system, a gap mechanism is attached to a hysteretic damper in series (called DLA) and a viscous damper is used in parallel.…”

“…Furthermore, it is noted that, since the MDOF model with the DHD possesses DSA, its fundamental natural period is shorter than 3.15(s). It should also be remarked that this recorded ground motion is not necessarily critical to the MDOF systems FIGURE 12 | Long-period pulse-type ground motion of extremely large amplitude, (A) Ground acceleration of JMA Nishiharamura-Komori (EW) wave, (B) Ground velocity of JMA Nishiharamura-Komori (EW) wave, (C) Displacement response spectrum, (D) Velocity response spectrum, (E) Acceleration response spectrum (Hashizume and Takewaki, 2020), and (F) Input energy spectrum. with the HVH system and with the DHD system because both models will experience the large plastic response.…”

“…Then Shiomi et al (2018) developed a sensitivity-based optimal method of damper placement for multi-degree-of-freedom (MDOF) systems. Recently, Hashizume and Takewaki (2020) proposed another new vibration control system called a 'hysteretic-viscous hybrid (HVH)' damper system by replacing the DSA (shortrange hysteretic damper) in the DHD system with a viscous damper. They compared the response reduction performance between the DHD and the HVH for SDOF systems.…”

Shake table tests on a reinforced concrete waffle‐flat plate structure with new hybrid energy dissipation devices

“…Marshall and Charley 8 conducted a comprehensive investigation of different hybrid configurations that utilize a metallic EDD (buckling restrained brace) and either viscoelastic EDDs (high‐damping rubber) or viscous fluid EDDs, connected in parallel or in series. Hashizume and Takewaki 9 proposed combining in parallel viscous EDDs with large stroke and a metallic EDDs with a gap mechanism connected in series. The gap mechanism lends a trigger to the metallic EDDs and delays their functioning.…”

A Multi-Objective Displacement-Based Design Procedure of Viscous and Hysteretic Damped Braces for the Seismic Protection of Rc Buildings

“…masonry infills, false ceilings and suspended piping) can be observed at the serviceability design earthquake (SDE), when too high activation forces of the HYDBs are considered in order to improve structural performance level at the basic (BDE) and maximum considered (MCE) earthquakes [2,3]. To overcome this problem, dampers working as fuses can be inserted as sacrificial elements in order to prevent damage of non-structural elements [4], by means of an in-parallel combination of different typologies of dampers [5,6], or alternatively damping and stiffness properties of dampers arranging in-series minor and major cores can be modulated to different seismic intensity levels [7]. A multi-objective design procedure is proposed in the present work, where viscous (VDBs) and hysteretic (HYDBs) damped braces calculated for immediate occupancy (IO), at SDE, are combined with HYDBs ensuring structural safety (SS), at MCE.…”