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21. SEISMIC RESPONSE OF STRUCTURES WITH SUPPLEMENTAL DAMPING

This paper presents a review of supplemental damping devices used for the control of the seismic response of structures. The mechanical properties of these devices are discussed and considerations in the design of energy absorbing systems are presented. Conventional structures passively resist earthquakes through a combination of strength, deformability and energy absorption. They have very little damping, so elastic energy absorption is small. Strong earthquakes deform these structures well beyond their elastic limit through localized plastic hinging, which results in increased flexibility and energy dissipation. Most of the earthquake energy is absorbed by the structure through localized damage of the lateral force resisting system. This is somewhat of a paradox in that the effects of earthquakes (i.e. structural damage) are counteracted by allowing structural damage. Structural performance can be greatly improved if a large portion of the input energy can be absorbed, not by the structure itself, but by some type of supplemental device. This paper describes a number of ways to do this, including friction devices, yielding metal systems, elastomeric viscoelastic dampers and fluid viscous dampers.

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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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