Seismic rehabilitation of a base‐isolated building using viscous dampers

“…Among them, the most popular are the high‐damping rubber bearings (HDRB), the lead rubber bearings (LRB) and the friction pendulum system (FPS) (Fig. 1) A combination of normal rubber bearing with viscous dampers is also common12.…”

Section: Passive Seismic Protection Systemsmentioning

confidence: 99%

The 2001 Infornortics Search Engine Meeting

Schwartz

2001

Bul. Am. Soc. Info. Sci. Tech.

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“…For example, Hart et al . successfully reduced the response of a base‐isolated building by using viscous dampers for seismic rehabilitation 1. Chang et al .…”

Section: Introductionmentioning

confidence: 99%

Control of seismically isolated bridges by magnetorheological dampers and a rolling pendulum system

Lin¹,

Lin²

2011

Struct. Control Health Monit.

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A new bridge isolation system that combines the rolling pendulum system (RPS) and the magnetorheological (MR) damper is proposed in this study. Unlike common bridge protection systems, the restoring force of the bridge deck under external excitation is provided by the RPS while objectoriented fuzzy logic controllers manipulate the tunable MR damper for optimal performance. Three different controllers were developed to focus on the specific mitigation targets of displacement and acceleration. To verify the performance of the proposed system, a scaled-down specimen from one vibration unit of a standard, simply supported Pre-stressed Concrete I beam (PCI) bridge in Taiwan was used under time-scaled and original earthquake time histories. The experimental results were compared with Rolling-Type Bearings using the Viscous Damper method (RTB1VD) in bridge engineering. Significant improvements in control effect were found for the proposed fuzzy controller with approximately 25% improvement in displacement reduction and 50% improvement in acceleration reduction. In addition, the specimen was also tested as a full-scale bridge model to verify its performance in practice. It was found that the proposed fuzzy controller could alleviate the acceleration response by more than 35% under a small or moderate earthquake while 25% could be reached in a major earthquake with similar displacement control efficiency under the passive control method. These results greatly support the implementation of the proposed system in future bridge engineering projects for better protection during earthquakes. 2 2 1 January 1 31 78 94 6analytically [2]. To determine the nonlinear behavior of the friction-based seismic isolator, a series of experiments have been recently carried out [3,4].By applying the concept of the isolation system and supplemental damper to bridge engineering, a system composed of sliding bearings, rubber restoring force devices, and fluid dampers was proposed by Tsopelas et al. to control bridge response under strong and longperiod level-2 earthquakes defined by the Japanese Society of Civil Engineering. The experimental results demonstrated a substantial reduction in the seismic substructure force in comparison with the response of non-isolated bridges [5]. A study of the elastoplastic bridge seismic isolation system using lubricated sliding bearings and steel dampers was conducted on the same specimen that was used to verify the American Association of State Highway and Transportation Officials design guidelines [6]. In 2004, Makris and Zhang studied the seismic response of an overcrossing highway equipped with elastomeric bearings and fluid dampers [7]. The advantages and challenges of using this system were compared in detail with a hypothetical bridge that consisted of integral abutments. In addition, Roberts wrote a detailed review of the various bridge control techniques used by the California Department of Transportation (CALTRAN) [8]. The review demonstrated the feasibility of applying the isolation bearing and sup...

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Seismic rehabilitation of a base‐isolated building using viscous dampers

Cited by 5 publications

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The importance in a global world of a structural reliability-based foundation for seismic evaluating and strengthening tall and special buildings

The importance in a global world of a structural reliability-based foundation for seismic evaluating and strengthening tall and special buildings

The 2001 Infornortics Search Engine Meeting

Control of seismically isolated bridges by magnetorheological dampers and a rolling pendulum system

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