Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

The Development of a 100 Mpa Class Ultra-high Strength Centrifugal Molded Square Beam Design and Manufacturing Technology

100MPa급 초고강도 원심성형 각형보의 설계 및 제작기술 개발

  • 이두성 ((주)주성이앤씨 기술연구소 ) ;
  • 김성진 ((주)주성이앤씨 기술연구소 ) ;
  • 김정회 (아이에스동서(주) 기술연구소 )
  • Received : 2023.05.08
  • Accepted : 2023.06.12
  • Published : 2023.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, a structural concrete square beam was developed using the centrifugal molding technique. In order to secure the bending stiffness of the cross section, the hollow rate of the cross section was set to 10% or less. Instead of using the current poor mixture of concrete, a special formwork for producing a centrifugal square beam was manufactured, and a concrete mixing ratio with a high slump (150-200) and a design strength of 100 MPa or more was developed and applied. The produced centrifugally formed rectangular beams were subjected to performance tests according to the standard bending and shear test standards for centrifugally formed members. The static load test results for the four specimens exceeded both the nominal bending strength and nominal shear strength, which are design values through structural design, proving the structural reliability of the ultra-high-strength centrifugally formed square beam.

본 연구에서는 원심성형 기법을 이용하여 구조용 콘크리트 각형보를 개발하였으며, 단면의 휨 강성을 확보하기 위하여 단면의 중 공률은 10 % 이하로 하며 이를 위하여 기존의 빈배합상태의 콘크리트가 아닌 고슬럼프(150~200 mm)의 물성을 가지며 설계강도가 100 MPa 이상인 콘크리트 배합비를 개발하여 적용하고, 원심성형 각형보를 제작하기 위한 특수거푸집을 제작하여 원심성형 각형보를 생산하였다. 생산된 원심성형 각형보는 원심성형 부재의 표준 휨 및 전단 시험기준에 따라 성능시험을 수행하였다. 4개의 시험체에 대한 정적재하시험 결과는 설계기준에서 제시하고 있는 단면의 공칭휨강도, 공칭전단강도 이상으로 나타나 초고강도 원심성형 각형보의 구조적인 신뢰성이 입증되었다.

Keywords

Acknowledgement

본 연구는 2021년국토교통부(국토교통과학기술진흥원) 국토교통기술사업화지원사업 '원심성형으로 제작된 100 MPa급 초고강도 직사각형 보의 제작기술 및 이를 상부구조로 하는 피암터널 공법개발(21TBIP-C161317-02)'를 통해 수행된 연구입니다. 연구지원에 감사합니다.

References

  1. Kim, T. H. (2012), Development of High Stregnth Cetrifugal Foremd Concerte Column, DAELIM Technical Review Architectual Engineering, 132-136. 
  2. Mha, H. S., Won, J. H., and Cho, H. S. (2012), A Study on Flexural Behavior of Composite PHC pile with CT Structural Steel, Journal of Korean Society of Steel Construction, KSSC, 24(2), 233-243 (in Korean).  https://doi.org/10.7781/kjoss.2012.24.2.233
  3. Kim, J. H., Kim, D. H., and Park, Y. S. (2021), A Study on the Mix Proportion of Concrete of Centrifugal Molding Beam, Proceedings of 2021 KCI Conf., KCI, 305-306 (in Korean). 
  4. Lee, D. S., Kim, Y. J., Kim, J. H., Kim, D. H., and Park, Y. S. (2021), A Study on the Design and Manufacturing Technology Development of Square Beams manufactured by Cetrifugal molding, Proceedings of 2021 KSCE Conf., KSCE, 619-620 (in Korean). 
  5. Kim, J. H., Kim, D. H., Park, Y. S., Lee, D. S., and Kim, Y. J. (2021), A Study on the Calculation of Centrifugal Force for Application of Precast Concrete Beam to Cetrifugal Molding System, Proceedings of 2021 KSMI Conf., KSMI, 14 (in Korean). 
  6. Lee, D. S., Kim, S. J., and Kim, J. H. (2022), The Experimental Study of the Ultimate Behavior of an Avalanche Tunnel Corner Rigid Joint Composited with a Centrifugal Formed Beam, Journal of the Korea Institute for Structual Maintenance and Inspection, 26(6), 128-138 (in Korean). 
  7. Lee, D. S., Kim, S. J., and Kim, J. H. (2023), The Experimental Study of Full-scale Centrifugal Formed High Strength Concrete Primatic Beam(CFPB) Compoited with Deck Slab, Journal of the Korea Institute for Structual Maintenance and Inspection, 27(1), 19-29 (in Korean). 
  8. Korean Standards Association (2019), Pretensioned spun high strength concrete piles, KS F 4306. 
  9. Korea Road & Transportation Association (KRTA) (2010), Road bridge design specifications (in Korean). 
  10. Korea Road & Transportation Association (KRTA) (2016), Road bridge design specifications (in Korean).