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.
Highlights
In the field of structural engineering of buildings and infrastructures, the resilience of structures is attracting many researchers and being treated as one of the targets of structural design (Bruneau et al, 2003; Cimellaro et al, 2010; Takewaki et al, 2011; Noroozinejad et al, 2019)
While the resistance can mostly be dealt with properly by the structural engineering technology, the recovery is related to various multidisciplinary fields including non-structural engineering fields
The control of earthquake response by passive dampers certainly enables the upgrade of earthquake resilience levels and the Hybrid Damper for Tall Building continuous use of buildings (Taniguchi et al, 2016a)
Summary
In the field of structural engineering of buildings and infrastructures, the resilience of structures is attracting many researchers and being treated as one of the targets of structural design (Bruneau et al, 2003; Cimellaro et al, 2010; Takewaki et al, 2011; Noroozinejad et al, 2019). The resilience consists of two phases, i.e., the resistance to disturbances and the recovery from damages. Various innovative methodologies for upgrading the level of resilience have been exploited. The control of earthquake response by passive dampers certainly enables the upgrade of earthquake resilience levels and the Hybrid Damper for Tall Building continuous use of buildings (Taniguchi et al, 2016a). As a result, unprecedented large-amplitude ground motions, called long-period pulse-type ground motions, were recorded. Even for such large-amplitude ground motions, the suppression of plastic deformations is strongly recommended in view of the resistance and recovery as the measure of earthquake resilience (Kojima and Takewaki, 2016; Ogawa et al, 2017)
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