All Issue

2018 Vol.34, Issue 1
Evaluation of Isolation Mechanism of Teflon or Steel Slag-Type Seismic Foundation Isolation Systems

테프론 또는 제강슬래그를 활용한 기초형 지진격리장치의 면진 메카니즘 평가

Su Won Son1
,
In-Gu Kang2
,
Bagheri Pouyan3
,
Jin Man Kim4*
손 수원1
,
강 인구2
,
푸얀 벅게리3
,
김 진만4*
1Ph. D Candidate, Dept. of Civil and Environmental Engrg., Pusan National Univ.
2Graduate Student, Dept. of Civil and Environmental Engrg., Pusan National Univ.
3Ph. D Candidate, Dept. of Civil and Environmental Engrg., Pusan National Univ.
4Prof., Dept. of Civil and Environmental Engrg., Pusan National Univ.
1부산대학교 사회환경시스템공학과 박사과정
2부산대학교 사회환경시스템공학과 석사과정
3부산대학교 사회환경시스템공학과 박사과정
4부산대학교 사회환경시스템공학과 토목공학전공 교수
*교신저자. *Corresponding Author. 
31 January 2018. pp. 5-16
PDF XML Citation
Abstract

In this study, seismic performance of geotechnical seismic isolation system capable of primary seismic isolation in the ground was evaluated. 1-G shaking table test was used to assess the performance of Teflon or steel slag as geotechnical seismic isolation systems installed beneath superstructure foundation. Response acceleration and response spectra were analyzed considering different input motions. The results were compared with those of fixed foundation structure without seismic isolation system. The steel slag-type seismic isolation system showed significant reduction in acceleration. The teflon-type seismic isolation system did not show significant effects on acceleration reduction in low-to-moderate seismicity condition, but it did show better effects in case of strong seismic condition. As input motion was transferred to the upper mass, the response spectrum of the fixed foundation structure was amplified in the short period range. In contrast, the response spectrum of the structure with seismic isolation using teflon or steel slag amplified in the long period range. It is found that the change of periodicity and the friction characteristics between isolation materials and foundations affected acceleration reduction.

Keywords
Seismic isolation system
Seismic performance
Bridge foundation
1-G shaking table
Sliding
Rocking
Teflon
Steel slag

본 연구에서는 지반에서 1차적인 면진작용을 할 수 있는 지반형 지진격리장치의 내진성능을 평가하였다. 테프론과 제강슬래그를 이용하여 지반형 지진격리장치를 조성한 후 그 위에 모형 상부구조물을 설치하고 1-G 진동대 실험을 수행하였다. 다양한 수준의 입력지진파에 대해 응답가속도와 응답스펙트럼을 분석하였으며, 지진격리장치가 없는 고정기초 구조물과 결과를 비교하였다. 연구결과, 제강슬래그형 지진격리장치가 가장 가속도 저감효과가 좋았으며, 테프론형 지진격리장치는, 중･약진 조건에서는 가속도 저감효과가 크게 없고 강진조건에서는 가속도 저감효과가 좋았다. 입력파가 상부질량(Mass)으로 전달되면서, 고정기초 구조물의 응답스펙트럼은 입력지진파에 비해 단주기영역에서 증폭하고, 테프론과 제강슬래그를 이용한 지진격리장치가 있는 구조물의 응답스펙트럼은 입력지진파에 비해 장주기영역에서 증폭하였다. 이러한 주기특성 변화와 재료간의 마찰특성이 가속도 저감효과에 영향을 준 것으로 판단된다.

References
1
An, T. (2006), Study on Oscillation Behavior and Aseismicity of Bridges with Seismic Isolation Foundation System, Ph.D Thesis, Civil and Environmental Engineering, Waseda University.
2
Cha, T. K. (2004), Seismic Behavior Analysis of Multi-Span Continuous Bridges Considering Seismic Bearings and Energy-Dissipating Devices, Master Thesis, Civil Engineering, Yonsei University
3
Edil, T.B. and Bosscher, P.J. (1994), “Engineering Properties of Tire Chips and Soil Mixtures”, American Society for Testing and Materials, Vol.17, No.4, pp.453-464.
4
Iai, S. (1989), “Similitude For Shaking Table Tests On Soil-Structure- Fluid Model In 1g Gravitational Field”, Japanese Society of Mechanics and Foundation Engineering, Soils and Foundations, Vol.29, No.1, pp.105-118.
5
Iai, S. and Sugano, T. (1999), “Soil-structure Interaction Studies through Shaking Table Tests”, Port and Harbour Research Institute, Japan.
6
Jung, H. J. (2008), To Support the Bridge Structure by the Isolation of the Earthquake Seismic Isolation, Master Thesis, Civil Engineering, Dong-A University.
7
Kim, J.M. (2005), “Dynamic Frictional Properties of Geosynthetic Interfaces Involving Only Non-geotextiles”, Journal of the Korean Geotechnical Society, Vol.21, No.7, pp.81-89.
8
8.Kim, J.M. (2003), “The Effects of Displacement Rate on Shear Characteristics of Geotextile-involved Geosynthetic Interfaces”, Journal of Korean Geotechnical Society, Vol.19, No.1, pp.173-180.
9
Kim, J.M., Riemer, M., and Bray, J. D. (2005), “Dynamic Properties of Geosynthetic Interfaces”, Geotechnical Testing Journal, ASTM, Vol.28, No.3, pp.288-296.
10
Rocha, M. (1957), “The Possibility of Solving Soil Mechanics Problems by the Use of Models”, Proc. 4th ICSMFE, Vol.1, pp. 183-188.
11
Panah, A.K. and Khoshay, A.H. (2015), “ A New Seismic Isolation System: Sleeved-Pile with Soil-Rubber Mixture”, International Journal of Civil Engineering, Vol.13, No.2, pp.124-132.
12
Son, S.W., Kim, E.S., Na, G.H., and Kim, J.M. (2017), “Evaluation of Performance of the Teflon-Type Seismic Foundation Isolation System”, Journal of Earthquake Engineering, Vol.21, No.3, pp. 125-135.
13
Son, S.W., Jeon, H.W., Ryu, J.H., and Kim, J.M. (2014), “Effect of Steel Slag-based Seismic Foundation Isolation System on Seismic Load Reduction”, Journal of the Korean Society Hazard Mitigation, Vol.14, No.1, pp.1-6.
14
Tsang, H.H. (2008), “Seismic Isolation by Rubber-Soil Mixtures for Developing Countries”, Earthquake Engineering and Structure Dynamic, Vol.37, No.2, pp.283-303.
15
Tsang, H.H., Lam, T.K., Yaghmaei, S., Sheikh, M., and Indraratna, B. (2010), “Geotechnical Seismic Isolation by Scrap Ture-Soil Mixtures”, 15th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, San Diego, California, 2010, May.
16
Xiong, W. and Li, Y. (2013), “Seismic Isolation using Granulated Tire-soil Mixtures for Less-Developed Regions: Experimental Validation”, Earthquake Engineering and Structual Dynamics, Vol.42, pp.2187-2193.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 34
  • No :1
  • Pages :5-16
  • Received Date : 2017-10-13
  • Revised Date : 2017-11-28
  • Accepted Date : 2017-12-06
  • DOI :https://doi.org/10.7843/kgs.2018.34.1.5
Journal Informaiton Journal of the Korean Geotechnical Society Journal of the Korean Geotechnical Society
Archives
: Vol.23~28 (2007~2012)
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close