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88. SEISMIC PERFORMANCE OF LIGHT FRAMED WOOD STRUCTURES WITH TOGGLE-BRACED FLUID DAMPERS

In recent years, seismic damping systems have been employed in numerous steel and concrete framed buildings. Such systems dissipate a significant portion of the seismic input energy, thereby relieving the energy dissipation demand on the structural framing system and thus reducing damage. As part of a NEESR project to develop a performance based approach to seismic design of multi-story light framed wood structures, the application of damping systems to such structures has been evaluated via seismic shaking table tests and numerical simulations. This paper focuses on the results from shaking table tests of shear walls employing toggle braced fluid dampers. The results demonstrate that toggle braced fluid dampers provide a significant increase in the seismic resistance of the walls, allowing them to achieve high levels of performance when subjected to strong ground motions.

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1. Application of Energy Dissipating

The design of a structure or mechanism subjected to shock and vibration can be greatly improved by the addition of isolation or damping devices. Improvements Include: Reduced Deflection and Stresses, Reduced Weight, Improved Biodynamics, Longer Fatigue Life, Architectural Enhancement and Reduced Cost.

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2. Bridge Design

This paper reports on a non-linear analysis of a bridge supported on sliding bearings with elastomeric restoring spring and viscous dampers. Results were verified with shake table tests.

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3. Commentary on Corrosion

This document shows designers how to avoid corrosion due to the interaction of different metals and alloys at bimetallic contacts. Section one describes the conditions that lead to corrosion at bimetallic contacts and methods to alleviate it. The tables in Section two show the degree of corrosion likely to occur at bimetallic contacts exposed to atmosphere and water.

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4. Earthquake Protection Systems

Taylor Devices, Inc. has been the leader in shock and vibration technology since 1955. Now, we have boldly stepped into the forefront of one of civil engineering’s greatest challenges: Seismic protection of buildings, bridges, historical structures, and even residential dwellings. Extensive research has been conducted in a joint effort with the National Center for Earthquake Engineering Research (NCEER), located at the State University of New York at Buffalo. A practical approach has been developed for dissipating energy from a structure by the addition of Taylor Devices’ unique Fluid Viscous Dampers. The most noteworthy features include a maintenance-free design proven by years of usage by the Military, “fail-safe” construction which insures safe operation for the life of the building or bridge, and significantly lower cost than conventional methods.

Taylor Devices’ Fluid Viscous Dampers can be incorporated into a newly designed structure or retrofit to existing structures to extend their ability to survive seismic events. The linear output of these devices allows ease in structural analysis using existing software codes.

This data book includes answers to the questions most frequently asked about the use of viscous damping in a structure. Application and sizing information is also provided. For more information about a custom designed seismic protection system for your specific application, please do not hesitate to contact us at our factory. Our staff of highly qualified experts is ready to help you.

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