Journal ArticleDOI
Aseismic roof isolation system: analytic and shake table studies
TLDR
In this paper, the authors proposed a roof isolation system based on the concept of a damped vibration absorber and made the roof, rubber bearings, and viscous dampers respectively constitute the mass, spring, and dashpot of such an absorber.Abstract:
Presented are the features of a roof isolation system that is proposed as a device to reduce the seismic response of buildings. Presented also are the details of and results from analytical and experimental studies conducted with a small-scale laboratory model to assess the feasibility and effectiveness of such a device. The roof isolation system entails the insertion of flexible laminated rubber bearings between a building's roof and the columns that support this roof, and the installation of viscous dampers that are connected to the roof and a structural element below the roof. It is based on the concept of a damped vibration absorber and on the idea of making the roof, rubber bearings, and viscous dampers respectively constitute the mass, spring, and dashpot of such an absorber. The model considered in the analytical and experimental studies is a 2.44-m high, five-storey, moment-resisting steel frame, with a fundamental natural frequency of 2.0 Hz. In the experimental study the frame is tested with and without the proposed roof isolation system on a pair of shaking tables under a truncated version of one of the accelerograms from the 1985 Mexico City earthquake. In the analytical study, the frame is also analysed with and without such a system and under the same ground motion except that the ground motion accelerations are properly magnified to study the effectiveness of the roof isolation system when the frame is stressed beyond its linear range of behavior. It is found that the suggested device effectively reduces the seismic response of the frame, although the extent of this reduction depends on how large its non-linear deformations are. Based on these findings, it is concluded that the proposed roof isolation system has the potential to become a practical and effective way to reduce earthquake damage in low- and medium-rise buildings.read more
Citations
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Journal ArticleDOI
Recent advances in nonlinear passive vibration isolators
TL;DR: In this paper, a comprehensive assessment of recent developments of nonlinear isolators in the absence of active control means is presented, which highlights resolved and unresolved problems and recommendations for future research directions.
Journal ArticleDOI
Comparison of the seismic performance of a partial mass isolation technique with conventional TMD and base-isolation systems under broad-band and narrow-band excitations
TL;DR: In this article, a partial mass isolation (PMI) technique is proposed to isolate different portions of masses at different stories to provide a building with multiple inherent vibration suppressors without the need to add extra masses.
Journal ArticleDOI
Simplified analysis of mid‐story seismically isolated buildings
Shiang-Jung Wang,Shiang-Jung Wang,Kuo-Chun Chang,Kuo-Chun Chang,J. S. Hwang,J. S. Hwang,Bo-Han Lee +6 more
TL;DR: In this article, the authors investigated the dynamic characteristics and seismic responses of mid-story isolated buildings using a simplified three-lumped-mass structural model for which equivalent linear properties are formulated.
Journal ArticleDOI
Aseismic Roof Isolation System Built with Steel Oval Elements: Exploratory Study
TL;DR: In this paper, a roof isolation system is proposed to reduce earthquake damage in buildings through the insertion of sliding bearings and the attachment of oval-shaped steel elements between the building's roof and the structure below.
Journal ArticleDOI
Dynamic behavior of a building structure tested with base and mid-story isolation systems
Shiang-Jung Wang,Kuo-Chun Chang,Kuo-Chun Chang,J. S. Hwang,J. S. Hwang,Jia-Yi Hsiao,Bo-Han Lee,Ying-Chen Hung +7 more
TL;DR: In this article, the authors investigated the discrepancies of dynamic behavior in base-isolated and mid-story isolated buildings and suggested the modal response spectrum analysis appropriately considering the contribution of higher modes, rather than the equivalent lateral force procedure only considering the fundamental mode.
References
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Journal ArticleDOI
Reduction seismic response with heavily-damped vibration absorbers
TL;DR: In this article, it is shown that the attachment of a small heavily-damped system in resonance can increase the damping of a building and reduce thus its response to earthquake excitations.
Journal ArticleDOI
Damped resonant appendages to increase inherent damping in buildings
TL;DR: In this article, the authors demonstrate that the addition of a tuned mass-spring-dashpot system with a relatively small mass and a high damping ratio can increase the inherent damping characteristics of buildings and reduce, thus, their response to earthquake excitations.
Journal ArticleDOI
Roof Isolation System to Reduce the Seismic Response of Buildings: A Preliminary Assessment
TL;DR: In this paper, a roof isolation system is proposed as a means to reduce the detrimental effect of earthquakes in buildings, which involves the insertion of flexible laminated rubber bearings between a building's roof and the columns that support it.
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Passive seismic control of cable‐stayed bridges with damped resonant appendages
TL;DR: In this paper, the authors investigated the effectiveness of attaching resonant appendages with a relatively small mass and a high damping ratio as a means to reduce their response to earthquake excitations, and concluded that the suggested appendages may indeed be effective in reducing the seismic response of cable-stayed bridges as they are for building structures.
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Seismic Isolation for Advanced Nuclear Power Stations
TL;DR: Seismic isolation offers an attractive approach for reducing seismic loads in nuclear structures, and more significantly, in reactor components isolation will lead to a simplification of designs, facilitate standardization, enhance safety margins, and may potentially reduce cost as discussed by the authors.