Response reduction methods for base isolated buildings with collision to retaining walls

Kishida, Akiko; Nishimura, Nao; Yamashita, Yoichi; Taga, Kenzo; Fujitani, Hideo; Mukai, Yoichi

doi:10.1117/12.2256229

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…The effectiveness of a new seismic isolation device in protecting the structure under near-fault (NF) ground motions, namely, the roll-in-cage (RNC) isolator, was assessed (Ismail et al, 2014a(Ismail et al, , 2014b; Ismail et al (2015) investigated the effectiveness of the RNC isolator with a built-in braking mechanism against pounding. Kishida et al (2017) discussed response reduction methods, including a new damper capable of changing the damping force as a function of input displacement and velocity, for base-isolated structures experiencing pounding. Morales (2021) focused particularly on strong-motion records and their importance on base motion of the isolated structures analyzed in frequency domain.…”

Section: Introductionmentioning

confidence: 99%

“…The first one involves the control of the peak displacement of the isolation layer by modifying the properties of the isolation layer (Ismail et al, 2014a, 2014b; Morales, 2021). The second approach introduces shock-absorbers (bumpers) between the isolation layer and the moat wall to absorb the impact effects during collision (Kishida et al, 2017; Komodromos, 2008; Polycarpou and Komodromos, 2011, 2013; Tsai, 1997). These two approaches could also be employed simultaneously (Ismail et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Investigations of the effects of a passive bumper on the seismic response of base-isolated buildings: Experimental study and parameter optimization

Zhong

Liu

Mercan

et al. 2022

Journal of Vibration and Control

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The horizontal displacement values experienced by the isolation layer of base-isolated buildings can exceed the allowable range and cause failures during the rare or very-rare earthquakes. Excessive horizontal displacements of the isolation layer may cause collisions between the building and retaining walls of the isolation ditch and even cause the collapse of the isolated building. This paper proposes a cost-effective, easy-to-build, passive bumper device, called Flexible Limit Protective Device (FLPD) in order to act as shock-absorbers. Through numerical simulations and experiments, the nonlinear behavior of the FLPD is investigated. Subsequently, through structural simulations, the effectiveness of using FLPDs is studied. The elitist non-dominated sorting genetic algorithm (NSGA-II) is used to optimize the design of FLPDs, and the response of structures equipped with optimized FLPDs are simulated numerically. The results indicate that proposed optimized FLPDs can effectively work as shock-absorbers for base-isolated structures. This paper can provide a guideline for the design of shock-absorbers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations of the effects of a passive bumper on the seismic response of base-isolated buildings: Experimental study and parameter optimization

Zhong

Liu

Mercan

et al. 2022

Journal of Vibration and Control

View full text Add to dashboard Cite

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Development of Simple Mechanical on-Off Damper for Base-Isolated Buildings Subjected Extreme Earthquakes

Kishida

Taga

2021

AIJ J. Technol. Des.

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This paper proposes a simple mechanical on-off damper that can change the damping force depending on the response displacement and response velocity. The on-off damper reduces the damage to seismic-isolated structures that undergo excessive deformation during huge earthquakes, without lowering the performance of the seismic-isolation system during design earthquakes. A numerical analysis method for baseisolated structures in which the isolation layer is equipped with our onoff damper, and also considers collisions with stoppers, is expatiated. A shaking table experiment was conducted, and the results were compared with the numerical analyses. The test results agree approximately with the numerical analysis results.

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Response reduction methods for base isolated buildings with collision to retaining walls

Cited by 2 publications

References 3 publications

Investigations of the effects of a passive bumper on the seismic response of base-isolated buildings: Experimental study and parameter optimization

Investigations of the effects of a passive bumper on the seismic response of base-isolated buildings: Experimental study and parameter optimization

Development of Simple Mechanical on-Off Damper for Base-Isolated Buildings Subjected Extreme Earthquakes

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