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Experimental Study on Deformation Resistance Capacity of SY Permanent Steel Form for RC Beam and Girder under Casting Concrete

SY 비탈형 보 거푸집의 콘크리트 타설시 변형저항성능에 관한 실험적 연구

  • Bae, Kyu-Woong (Department of Architecture-Urban Engineering, Korea Institute of Civil Engineering & Building Technology) ;
  • Shin, Sang-Min (Department of Building Research, Korea Institute of Civil Engineering & Building Technology)
  • Received : 2021.09.24
  • Accepted : 2021.11.23
  • Published : 2021.12.20

Abstract

Recently, to shorten construction periods and reduce labor costs, the need for a corrugated beam form in the RC structure is being emphasized. The purpose of this study is to evaluate the deformation performance of SY Beam, a newly developed corrugated beam form work, during concrete casting. The standard cross-sectional shape of SY Beam was determined by modeling the deck structure of various thicknesses using the MIDAS GEN program. As a result, the cross-sectional dimensions of the SY Beam were determined to be 400mm and 450mm in width and height, respectively. A total of three SY Beam specimens were fabricated using steel plate thicknesses of 0.8, 1.0, and 1.2mm. The load conditions applied during casting concrete at the actual site are reflected. The vertical and horizontal displacements of the SY beam were measured during concrete casting. As a result, the vertical displacement showed a tendency to decrease as the thickness increased. Considering both vertical and horizontal displacement, the case with steel plate thickness of 1.2mm is the safest and most immediately applicable to the field. In the future, to secure manufacturability, constructability, and economics, the optimum steel plate thickness should be derived, and additional analysis and experimental studies for 1.05, 1.1, and 1.15mm are required.

최근 공사 기간 단축과 인건비 절감을 위해 거푸집을 탈형하지 않는 비탈형 보거푸집의 필요성이 RC구조물에서 강조 되고 있다. 본 연구의 목적은 새로 개발된 비탈형 보 거푸집인 SY Beam의 콘크리트 타설시 변형성능을 평가하는 것이다. SY Beam의 표준 단면 형상은 MIDAS GEN 프로그램을 통해, 다양한 두께의 강판 데크 구조 모델링을 수행하여 결정하였다. 그 결과, SY Beam의 단면치수는 폭과 높이가 각각 400mm와 450mm로 결정하였다. 강판두께 0.8, 1.0, 1.2mm를 변수로 하여 총 3 개의 SY Beam 실험체를 제작하였다. 실제 현장에서 콘크리트를 타설할 때 작용하는 하중 조건을 반영하였다. 콘크리트 타설시 SY Beam 단면의 수직 및 수평 변위를 측정하였다. 그 결과, 수직 변위는 두께가 증가할수록 감소하는 경향을 보였다. 수직변위와 수평변위를 모두 고려할 때, 강판두께 1.2mm의 경우가 가장 안전하고 즉시 현장 적용이 가능하다. 향후, 제작성, 시공성, 경제성을 확보하기 위해 최적의 강판두께를 도출하여야 하며, 1.05, 1.1, 1.15mm 에 대한 추가의 해석 및 실험연구가 필요하다.

Keywords

Acknowledgement

As part of the results supported by SY STEEL TECH Co., LTD, this research expresses great gratitude for helping with the production of specimens and provision of a casting test site.

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