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36. VISCOUS DAMPING FOR BASE ISOLATED STRUCTURES

Seismic Base Isolation can use elastomeric pads, sliding plates or inverted pendulums. Each method can include an energy dissipation means, but only as some kind of hysteretic damping. Hysteretic damping has limitations in terms of energy absorption and may tend to excite higher modes in some cases. It’s possible to avoid these problems with viscous dampers. Viscous damping adds energy dissipation through loads that are 90o out of phase with bending and shear loads so even with damping levels as high as 40% of critical adverse side effects tend to be minimal. This paper presents basic theory of viscous damping and also describes a sample project. Viscous dampers being built for the new San Bernardino Medical Center reduce both deflections and loads by 50% compared with high damping elastomer base isolation bearings by themselves.

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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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