Aseismic Hybrid Control System for Building Structures under Strong Earthquake

Yang, Jhen Hong; Danielians, A.; Liu, S.C.

doi:10.1177/1045389x9000100405

Cited by 6 publications

(5 citation statements)

References 6 publications

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“…Here, k l varies with the lateral displacement, because G is strain dependent. The stiffness at a given displacement can be calculated from equation (1), provided the value of G used is for the appropriate rubber shear strain. In the region of the typical design rubber shear strain (100 per cent), the modulus does not vary strongly, and thus the isolators will show an approximately linear behaviour.…”

Section: Base-isolation Systemmentioning

confidence: 99%

“…Isolation of buildings from the horizontal component of seismic ground motions is becoming more recognized as a method of protection. The horizontal components of earthquake ground motions are usually the most damaging to structures [1]. Referring to non-structural elements, the interstorey drifts and oor accelerations are the main sources of damage.…”

Section: Introductionmentioning

confidence: 99%

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Analytical dynamic analysis of earthquake base-isolation structures using time history modal superposition

Carneiro

Melo

Jalali

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper analyses a case study of the dynamic behaviour of structures with a base-isolation device support. The objective of the present analysis is to understand why and under what conditions the baseisolation pair is effective in reducing earthquake-induced forces in structures. To this end, a one-storey building with high-damping rubber bearings (HDR) installed between the base building and the foundation was considered. Most isolation systems are non-linear in force-deformation relations, but this behaviour was not considered, since, in the region of typical design rubber shear strain (100 per cent), the rubber shear modulus does not change sharply, and thus the isolator shows approximately a linear behaviour. In order to evaluate the ef ciency of the base-isolation system under earthquake motion, linear analysis using a modal superposition technique was carried out on buildings with and without the isolation system under two different strong ground motions, namely the Northridge 1994 and El Centro 1940 earthquakes. It was found from the analysis that the primary reason for effectiveness offered by rubber bearings in reducing earthquake-induced forces in a building is the lengthening of the rst natural vibration period. Moreover, the reduction in forces also depends on the type of earthquake motion. However, the maximum accelerations and base shear force were signi cantly reduced with the insertion of a rubber isolation system, regardless of the ground motion input.

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Section: Base-isolation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical dynamic analysis of earthquake base-isolation structures using time history modal superposition

Carneiro

Melo

Jalali

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…Recognizing that supplemental damping can effectively reduce seismic demands in BISs, 5,13 several researchers investigated the use of passive dynamic vibration absorbers for the task. Specifically, Yang et al 14 and Tsai 15 showed numerically that conventional tuned mass dampers (TMDs) comprising an oscillating secondary mass attached to the isolation layer via a viscoelastic link (ie, linear spring/stiffener in parallel with a linear viscous damper) can reduce seismic drift demands in base isolated multistorey buildings. Further, Taniguchi et al 16 considered the response of TMD-equipped BISs modelled as linear single degree of freedom (SDOF) systems exposed to several recorded GMs and showed that TMDs can reduce peak BIS displacement and, for some of the GMs, peak BIS acceleration as well.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental seismic performance assessment and numerical modelling of nonlinear inerter vibration absorber (IVA)‐equipped base isolated structures tested on shaking table

Pietrosanti

Angelis

Giaralis

2021

Earthq Engng Struct Dyn

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In recent years, inerter vibration absorbers (IVAs), such as the tuned mass damper inerter (TMDI), attracted much attention in the literature for reducing seismic displacement demands of base isolated structures (BISs). Several theoretical studies reported reduced BIS seismic demands with increasing inertance endowed by a grounded inerter element, but adopted mostly idealized linear dynamical models. Herein, the potential of TMDI-configured IVAs for seismic response reduction of BISs modelled as single-mass structures is assessed under the combined effects of nonlinear inerter and structural behavior. To this aim, experimental data from a shaking table testing campaign are considered utilizing a custom-built flywheel rack-and-pinion grounded inerter prototype with variable inertance, along with high damping rubber bearings in the isolation layer and in the BIS-to-absorber link. White noise excitation and an ensemble of six ground motions (GMs) with different frequency content are used in the tests for which bearings exhibit softening nonlinear behavior. Experimental results demonstrate improvement of BIS nonlinear seismic response in terms of displacement and base shear with increasing inertance for nonlinear and nonoptimally tuned IVAs. It is found though that the considered IVAs may be detrimental to BIS acceleration response depending on the GMs time-varying frequency content signatures as captured by the continuous wavelet transform spectrogram.Finally, it is concluded that representing the inerter device by a simplified linear dissipative model as opposed to a nonlinear model with friction and gear backlash suffices to trace the BIS response with acceptable accuracy and, thus, can be used for optimal seismic TMDI design. K E Y W O R D Sbase isolated system (BIS), experimental parametric analysis, inerter, nonlinear models, seismic effectiveness, tuned mass damper inerter (TMDI)This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Some of the most common composites used as reinforcements have been glass fibre reinforced plastics (GFRP), carbon fibre reinforced plastics (CFRP) and basalt fibre reinforced plastics (BFRP). H. Yang et al [3] studied the flexural behavior of FRP reinforced glulam, they observed that reinforced poplar glulam with FRP increased the ultimate load by 18-63%, and bending stiffness by 32-88%. S. Li et al [4], L. Cheng et al [5] used CFRP and GFRP to reinforce LVL.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Laminated Veneer Lumber with Ramie Fibre

Wang

Huang

2011

AMR

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This paper describes a preliminary investigation on the use of ramie fibre/ phenol formaldehyde (PF) composite to reinforce laminated veneer lumber (LVL). This research was conducted in two phases. Phase 1 the ramie fibre was treated with KH-550 silane coupling agent. Phase 2 different numbers of sheets ramie fibre/PF were added in different location of LVL to reinforce. The reinforced LVL was hot pressed at one time. A control group of unreinforced LVL was also manufactured. The results showed that the improvement in level shear properties of reinforced LVL was obvious no matter what loading direction was perpendicular or parallel. The improvement in modulus of elasticity (MOE) and modulus of rupture (MOR) of partial reinforced LVL was obvious too. Preliminary results showed that using ramie fibre composite to reinforce LVL was possible. This research will further broaden the application field of natural fibres, and provide a new improvement way for wood based composite.

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Aseismic Hybrid Control System for Building Structures under Strong Earthquake

Cited by 6 publications

References 6 publications

Analytical dynamic analysis of earthquake base-isolation structures using time history modal superposition

Analytical dynamic analysis of earthquake base-isolation structures using time history modal superposition

Experimental seismic performance assessment and numerical modelling of nonlinear inerter vibration absorber (IVA)‐equipped base isolated structures tested on shaking table

Reinforcement of Laminated Veneer Lumber with Ramie Fibre

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