Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Structural Capacity Evaluation of System Scaffolding using X-Type Advanced Guardrail

교차가새형 선행 안전난간을 적용한 시스템비계의 구조 성능 평가

  • Park, J.D. (Department of Safety and Health, University of Ulsan) ;
  • Lee, H.S. (Office of General OSH Programs, Korea Occupational Safety and Health Agency) ;
  • Shin, W.S. (Construction System Board, Korea Occupational Safety and Health Agency) ;
  • Kwon, Y.J. (Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency) ;
  • Park, S.E. (Civil Engineering Division, Korea Railroad Corporation) ;
  • Yang, S.S. (Department of Civil, Safety and Environmental Engineering, Hankyong National University) ;
  • Jung, K. (School of Industrial Engineering, University of Ulsan)
  • 박주동 (울산대학교 안전보건전문학과) ;
  • 이현섭 (안전보건공단 기술총괄본부 정책사업부) ;
  • 신우승 (안전보건공단 건설시스템단) ;
  • 권용준 (안전보건공단 산업안전보건연구원) ;
  • 박순응 (한국철도공사 기술본부 토목시설처) ;
  • 양승수 (한경대학교 토목안전환경공학과) ;
  • 정기효 (울산대학교 산업경영공학부)
  • Received : 2020.09.03
  • Accepted : 2020.10.21
  • Published : 2020.10.31
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Abstract

In domestic construction sites, when installing steel pipe scaffolding and system scaffolding, the guardrails are installed after the installation of the work platforms. This conventional guardrail system (CGS) is always exposed to the risk of falls because the safety railing is installed later. In order to prevent fall disasters during erecting and dismantling scaffolds, it is necessary to introduce the advanced guardrail system (AGS) which installs railings in advance of climbing onto a work platform. For the introduction of the AGS, the structural performance of the system scaffolding applying the CGS and the AGS was compared and evaluated. The structural analysis of the system scaffold (height: 31 m and width: 27.4 m) with AGS confirmed that structural safety was ensured because the maximum stress of each element of the system scaffolding satisfies the allowable stress of each element. As a result of performance comparison of CGS and AGS for each element, the combined stress ratio of vertical posts in AGS was 6.4% lower than that of CGS. In addition, in the case of ledger and transom, the combined stress ratios of AGS and CGS were almost the same. The compression test of the assembled system scaffolding (three-storied, 1 bay) showed that the AGS had better performance than the CGS by 9.7% (8.91 kN). The cross bracing exceeds the limit on slenderness ratio of codes for structural steel design. But the safety factor for the compressive load of the cross bracing was evaluated as meeting the design criteria by securing 3 or more. In actual experiments, it was confirmed that brace buckling did not occur even though the overall scaffold was buckled. Therefore, in the case of temporary structures, it was proposed to revise the standards for limiting on slenderness ratio of secondary or auxiliary elements to recommendations. This study can be used as basic data for the introduction of AGS for installing guardrails in advance at domestic construction sites.

Keywords

References

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