Seismic Behavior and Design Guidelines for Steel Frame Structures with Added Viscoela

[david-smith]

Seismic Behavior and Design Guidelines for Steel Frame Structures with Added Viscoelastic Dampers

Author: K.C. Chang, M.L. Lai, T.T. Soong, D.S. Hao and Y.C. Yeh | Size: 32.6 MB | Format: PDF | Quality: Scanner | Publisher: NCEER | Year: 1993 | pages: 110 | ISBN: Technical Report NCEER-93-0009

ABSTRACT
In order to determine the effectiveness of adding viscoelastic dampers to structures on the reduction of their seismic response, a comprehensive analytical and experimental program
was carried out. The experimental program was first conducted on a 2/5-scale five-story steel frame under precisely controlled ambient temperatures and subject to simulated ground motions with peak accelerations ranging from 0.12g to 0.60g. Results show that viscoelastic dampers are very effective in attenuating seismic structural response at all levels of earthquake ground motions, and that their energy dissipation capacity decreases as ambient temperature increases. However, they are effective at all temperatures tested in the research program. A rational seismic design procedure for viscoelastically damped structure is developed based on these results.
Further tests using a full-scale prototype structure confirm that damping in the full-scale structure can be significantly increased by adding relatively small viscoelastic dampers. The damper design procedure developed based on the scaled model can also be applied to the full-scale structure. This full-scale analytical and experimental study provides an important base for applying the extensive data generated from the scaled model testing to the full-scale structures.

TABLE OF CONTENTS
Section
1 INTRODUCTION......................................................................... 1-1
2 DYNAMIC CHARACTERISTICS OF VISCOELASTIC DAMPERS........... 2-1
3 SEISMIC TESTS OF VISCOELASTICALLY DAMPED STRUCTURE............. 3-1
4 ANALYTICAL SiMULATIONS '........ 4-1
5 DESIGN OF STRUCTURES WITH ADDED VISCOELASTIC
6 FULL-SCALE STRUCTURAL TESTS.................................................. 6-1
7 SUMMARy................................................................................. 7-1
8 REFERENCES. . ... . .. ... .. .. .. .. ... .. .. .. ... .. .. .. .. ... .. .. .. .. . .. .. .. .. ... .. .. .. .... ... . 8-1

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The protective and intelligent systems program constitutes one of the important areas of research
in the Building Project. Current tasks include the following:
1. Evaluate the performance of full-scale active bracing and active mass dampers already in place in terms of performance, power requirements, maintenance, reliability and cost.
2. Compare passive and active control strategies in. terms of structural type, degree of effectiveness, cost and long-term reliability.
3. Perform fundamental studies of hybrid control.
4. Develop and test hybrid control systems.
NCEER's activities in viscoelastic dampers research for seismic applications began in 1987 with analytical and experimental work carried out at the State University of New York at Buffalo and at the University of California at Berkeley. The ultimate aim is to determine their effectiveness when incorporated into a structure under seismic loads, and to develop a rational design procedure for such structures. This report summarizes results of a comprehensive analytical and experimental program for steel frame structures. The experimental program was first conducted on a 215-scale steel frame in the laboratory, followed by verification tests conducted on a full-scale prototype structure. A rational seismic design procedure for viscoelastically damped steel frame structures is developed based on these results.

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[pezhmankhan]

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[kowheng]

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[bridgeengineer]

please reupload

thanks