Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Evaluation of the Rotational Stiffness of Connections between Vertical and Horizontal Members for the Highly Reusable System Supports

재사용율이 높은 시스템 동바리의 수직재와 수평재 연결부 회전강성 평가

  • 박지선 (한국건설기술연구원 건축연구본부) ;
  • 송태협 (한국건설기술연구원 건축연구본부)
  • Received : 2023.11.28
  • Accepted : 2023.12.18
  • Published : 2023.12.30
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Abstract

To avoid arbitrary design and excessive braces of system supports with high reusability in the field, this study aimed to propose connection conditions for the vertical and horizontal joints of the system supports based on performance evaluation. Disk-type and pocket-type connection materials, widely used in domestic construction sites, were selected for evaluation of rotational stiffness based on load directions(vertical and horizontal) and loading methods (monotonic and cyclic). Contrary to the current design standards specifying a rotational stiffness of "0" for connection materials, the experimental results revealed that, contrary to the current design standards specifying a rotational stiffness of "0" for connection materials, all specimens exhibited rotational stiffness values. The maximum rotational stiffness was observed to be 19.624 kNm/rad in specimens subjected to repeated loading in the vertical direction using disk-type connection materials.

현장에서 재사용율이 높은 시스템 동바리를 대상으로 임의 설계와 과도한 가재새 보강을 지양하고자 성능평가를 근거로한 시스템 동바리의 수직재와 수평재의 연결부에 대한 연결 조건을 제시하고자 하였다. 이를 위하여 국내에 가설현장에 널리 사용되는 대표적인 연결재 유형인 디스크형과 포켓형을 대상을 하중방향(수직, 수평)과 가력방법(단조, 반복)에 대하여 회전강성을 평가하였다. 평가결과 현행 설계기준에서 연결재에 대하여 회전강성을 "0"으로 규정한 것과 달리 모든 시편에서 회전강성 값을 확인할 수 있었으며, 최대 회전강성은 디스크형 연결재를 사용하여 수직방향으로 반복 가력한 시편에서 회전강성값이 19.624 kNm/rad로 확인되었다.

Keywords

Acknowledgement

본 연구는 2023년 국가건설기준센터 운영 출연금 연구사업(과제코드: 20230024-004) 지원에 의해 수행되었습니다. 이에 감사드립니다.

References

  1. Abdel-Jaber, M.S., Beale, R.G., Godley, M.H.R., Abdel-Jaber, M. (2009). Rotational strength and stiffness of tubular scaffold connectors, Proceedings of the Institution of Civil Engineers-Structures and Buildings, 162(6), 391-403. https://doi.org/10.1680/stbu.2009.162.6.391
  2. BS EN 74-1. (2022). Couplers, Spigot Pins and Baseplates for Use in Falsework and Scaffolds Part 1: Couplers for Tubes, Requirements and Test Procedures, British Standard, UK.
  3. Chandrangsu, T., Rasmussen, K.J.R. (2011). Structural modelling of support scaffold system, Journal of Constructional Steel Research, 67(5), 866-875. https://doi.org/10.1016/j.jcsr.2010.12.007
  4. Kang, K.Y., Choi, K.G., Na, G.H., Kim, S.H. (2016). Buckling safety analysis of system support, Proceedings of Korea Institute for Structural Maintenance and Inspection, Korea Institute for Structural Maintenance and Inspection, Daejeon, Korea, 20(2), 169-170 [in Korean].
  5. Kim, G.Y., Won, J.H., Lee, H.D. (2016). Structural safety analysis of system supports considering boundary condition of connection parts between vertical and horizontal members, Proceeding of Computational Structural Engineering Institute of Korea, Computational Structural Engineering Institute of Korea, Daejeon, Korea, 29(1), 1-2 [in Korean].
  6. Lee, J.S. (2019). Structural Performance Evaluation of System Support Regarding the Rotation Stiffness of the connections, Ph.D Thesis, Incheon National University [in Korean].
  7. Liu, H., Jia, L., Wen, S., Liu, Q., Wang, G., Chen, Z. (2016). Experimental and theoretical studies on the stability of steel tube- coupler scaffolds with different connection joints, Engineering Structures, 106, 80-95. https://doi.org/10.1016/j.engstruct.2015.10.015
  8. Zhang, H., Chandrangsu, T., Rasmussen, K.J.R. (2010). Probabilistic study of the strength of steel scaffold systems, Structural Safety, 32(6), 393-401. https://doi.org/10.1016/j.strusafe.2010.02.005