한국지반공학회:학술대회논문집 (Proceedings of the Korean Geotechical Society Conference)
- 한국지반공학회 2005년도 춘계 학술발표회 논문집
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- Pages.308-319
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- 2005
벤더 엘리멘트를 이용한 토목재료의 강성측정에 대한 적용성 연구
A Pilot Study of Bender Elements in Stiffness Measurements of Civil Engineering Materials
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Mok, Young-Jin
(Dept. of Civil Engrg, Kyunghee Univ.) ;
- Jung, Jae-Woo (Dept. of Civil Engrg. Kyunghee Univ.) ;
- Jang, In-Sung (Coastal Engineering and Harbour Research Division, KORDI)
- 발행 : 2005.03.25
초록
Piezo-ceramics are special materials which transform energy between mechanical and electrical forms. Bender-elements are composite materials consisting of thin piezo-ceramics and elastic shims, and are widely used as actuators and transducers in the field of electronics, robotics, autos and mechatronics utilizing the effectiveness of energy transformation capability. In geotechnical engineering, commercial bender-elements are used in laboratory as source and receiver in the measurements of soil stiffness. The elements were built by using various metal shims sandwiched between piezo-ceramics and coating over the composite in the research. A pair of elements were buried in a concrete block and used as source and receiver to measure the stiffness of the concrete. The test results were verified by comparing with the resonant column testing results. In a preliminary stage of the development of an in-situ seismic testing equipment using bender-elements for soft clay materials, shear waves were generated and measured by burying the elements in the barrel of kaolinite and water mixture. The measured shear wave signals were so distinct for the first-arrival pick that applicability of the elements in the field measurements is very promising.