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46. DESIGN OF STEEL PYRAMID USING FLUID VISCOUS DAMPERS WITH MOMENT FRAMES

The Eleven story 450,000 ft2 pyramid shaped office building described in this article was one of the first new buildings in the United States to use Seismic Dampers. This National Headquarters for a financial institution is located in West Sacramento, CA. The basic lateral force resisting system of the building consists of steel moment frames. In addition, approximately 15% of critical damping was provided using Fluid Viscous Dampers (FVD) in order to reduce displacement and acceleration. The steel moment frames were designed to remain well below the yield strength, and the story drift ratio was limited to 0.005 to protect the welded moment connections for the Design Basis Earthquake (DBE). Earthquake performance, cost effectiveness, and architectural requirements were the primary concerns in designing this building.

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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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