Development of the EDR-Spring Element Using Foamed Polymer Materials and the Design of NSE-Isolated Buildings Using EDR-Spring Elements

Mitsuo Miyazaki; Yukihiro Nishimura

doi:10.20965/jdr.2011.p0668

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JDR Vol.6 No.6 pp. 668-689

(2011)

doi: 10.20965/jdr.2011.p0668

Paper:

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Development of the EDR-Spring Element Using Foamed Polymer Materials and the Design of NSE-Isolated Buildings Using EDR-Spring Elements

Mitsuo Miyazaki and Yukihiro Nishimura

Dynamic Design Inc., ISE Bldg. 3F 1-16 Sumiyoshi-cho, Shinjuku-ku, Tokyo 162-0065, Japan

Received:

December 5, 2009

Accepted:

January 4, 2010

Published:

December 1, 2011

Keywords:

seismic isolation, strain energy, resonance phenomena, foamed polymer material, NSE seismic isolation, EDR spring element

Abstract

Seismic Isolation can provide superior building safety during strong earthquakes, but it is known that some near-source ground motions produce excessive response deformations, and these may be larger than the allowable capacity of the isolation devices. “Seismic Isolation with No Strain Energy” (NSE), a new isolation concept, has been proposed as a solution to the problem. By eliminating the strain energy stored in deformed isolators, the resulting resonance problem can be completely resolved. The goal of the paper is to successfully produce an NSE spring element which has the restoring characteristics of the EDR-spring model for NSE-isolated buildings. The paper tested 15 foamed polymer materials and selected the most suitable one for the EDR-spring element. It has an elimination ratio of stored strain energy of ß≥0.7. The design loop for the spring using the selected material was established, and two model buildings of 5 stories and 15 stories were designed using the EDR-spring and sliders supporting the buildings’ weight. The designed NSE-isolated buildings’ superior dynamic performance against very strong earthquakes, even in cases in which input ground motions have the same predominant period as the isolated structures, was confirmed by dynamic response analyses.

Cite this article as:

M. Miyazaki and Y. Nishimura, “Development of the EDR-Spring Element Using Foamed Polymer Materials and the Design of NSE-Isolated Buildings Using EDR-Spring Elements,” J. Disaster Res., Vol.6 No.6, pp. 668-689, 2011.

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References

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[4] R. I. Skinner, W. H. Robinson, and G. H.McVerry, “An Introduction to Seismic Isolation,” John Wiley & Sons Ltd, 1993.
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[19] M. Miyazaki, Y. Nishimura and T. Mizue, “Seismic Isolation with no Strain Energy, – Research on a Seismic Isolation System without Resonance Characteristics –,” J. of Disaster Research Vol.6, No.6, 2011.
[20] H. Akiyama, “Prediction for Seismic Responses of Flexible-Stiff Mixed Structures with Energy Concentration in the First Story,” J. of Structural and Construction Engineering (Trans. of AIJ), Architectural Institute of Japan, Vol.400, pp. 77-84, June, 1989.
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[22] M. Takayama et al., supervised by Hideyuki Tada, “The Way to 4-seconds Seismic Isolation,” Rikoh-Tosho, pp. 14-19, Aug., 1997.
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[24] “The Reports and Technical papers of Response Control technology committee for RC Structures,” ppII-47, JCI (Japan Concrete Institute), June, 2002.

This article is published under a Creative Commons Attribution-NoDerivatives 4.0 Internationa License.

[1] [1] “Seismically Isolated buildings (Technology Developments and Earthquake Observation Results),” Building Center of Japan, Nov., 1992.

[2] [2] “2008 Accumulated Data on Seismically Isolated Buildings in Japan,” MENSHI No.65, pp. 29-30, JSSI (Japan Society of Seismic Isolation), Aug., 2009.

[3] [3] “Structural Response and Performance for Long Period Seismic Ground Motions,” Architectural Institute of Japan, Dec., 2007.

[4] [4] R. I. Skinner, W. H. Robinson, and G. H.McVerry, “An Introduction to Seismic Isolation,” John Wiley & Sons Ltd, 1993.

[5] [5] J. M. Kelly and F. Naeim, “Design of Seismic Isolated Structures,” John Wiley & Sons, Inc., 1999.

[6] [6] S. Okamoto and M.Higashino, “Response Control and Seismic isolation of Buildings,” TG44, CIB, Talor & Francis, 2006.

[7] [7] “Recorded Earthquake Ground Motions in the 2007 Niigata-ken Chuetsuoki Earthquake and the 2008 Iwate-Miyagi Nairiku Earthquake,” No.5 Technical Annual Report, pp2-1∼2-9, Input motion sub-committee, Seismic Isolation Design Div. JSSI(Japan Society of Seismic Isolation), 2009/4/23.

[8] [8] M. Miyazaki, “The Next Generation of Seismic Isolation, – Going beyond Seismic Design Dominated by Earthquakes –,” J. of Disaster Research Vol.3, No.6, Dec., 2008.

[9] [9] M. Miyazaki and Y. Nishimura, “A Study on the Response Instability of Seismically Isolated Structures affected by Ground Inclination during Earthquakes, (Part1) Estimation of Ground Inclination during Earthquakes and the Influence of Static Ground Inclination,” J. of Disaster Research, Vol.6, No.3, pp. 281-298, June, 2011.

[10] [10] “Symposium ; How to design our buildings against inland strong earthquake ground motion in Osaka area,” Earthquake Resistant structure Research committee, JSCA Kansai-branch, March, 10, 2008.

[11] [11] M. Miyazaki and Y. Nishimura, “A Study on the Response Instability of Seismically Isolated Structures affected by Ground Inclination during Earthquakes, (Part 2) Influence of Dynamic Ground Inclination,” J. of Disaster Research, Vol.6, No.3, pp. 299-312, June, 2011.

[12] [12] M. Miyazaki, Y. Nishimura and T. Mizue, “Seismic Isolation with no Strain Energy, – Research on a Seismic Isolation System without Resonance Characteristics –,” J. of Disaster Research Vol.6, No.6, 2011.

[13] [13] H. Akiyama, “Prediction for Seismic Responses of Flexible-Stiff Mixed Structures with Energy Concentration in the First Story,” J. of Structural and Construction Engineering (Trans. of AIJ), Architectural Institute of Japan, Vol.400, pp. 77-84, June, 1989.

[14] [14] H. Akiyama, “Earthquake Resistant Design to meet to Diversified Performance,” J. of Structural and Construction Engineering (Trans. of AIJ), Architectural Institute of Japan, Vol.472, pp. 85-90, June, 1995.

[15] [15] M. Takayama et al., supervised by Hideyuki Tada, “The Way to 4-seconds Seismic Isolation,” Rikoh-Tosho, pp. 14-19, Aug., 1997.

[16] [16] H. Akiyama, “Earthquake Resistant Design Method for Buildings based on Energy Balance,” Gihodo-Shuppan, Nov., 1999.

[17] [17] “The Reports and Technical papers of Response Control technology committee for RC Structures,” ppII-47, JCI (Japan Concrete Institute), June, 2002.

[18] [18] M. Miyazaki and Y. Nishimura, “A Study on the Response Instability of Seismically Isolated Structures affected by Ground Inclination during Earthquakes, (Part 2) Influence of Dynamic Ground Inclination,” J. of Disaster Research, Vol.6, No.3, pp. 299-312, June, 2011.

[19] [19] M. Miyazaki, Y. Nishimura and T. Mizue, “Seismic Isolation with no Strain Energy, – Research on a Seismic Isolation System without Resonance Characteristics –,” J. of Disaster Research Vol.6, No.6, 2011.

[20] [20] H. Akiyama, “Prediction for Seismic Responses of Flexible-Stiff Mixed Structures with Energy Concentration in the First Story,” J. of Structural and Construction Engineering (Trans. of AIJ), Architectural Institute of Japan, Vol.400, pp. 77-84, June, 1989.

[21] [21] H. Akiyama, “Earthquake Resistant Design to meet to Diversified Performance,” J. of Structural and Construction Engineering (Trans. of AIJ), Architectural Institute of Japan, Vol.472, pp. 85-90, June, 1995.

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[23] [23] H. Akiyama, “Earthquake Resistant Design Method for Buildings based on Energy Balance,” Gihodo-Shuppan, Nov., 1999.

[24] [24] “The Reports and Technical papers of Response Control technology committee for RC Structures,” ppII-47, JCI (Japan Concrete Institute), June, 2002.