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

A Evaluation of Fire Behavior According to Member Thickness of Precast Prestressed Hollow Core Slab of Fire Resistance Section

프리캐스트 프리스트레스트 내화단면 중공슬래브의 부재두께에 따른 화재거동평가

  • 부윤섭 (한국건설기술연구원 건축연구본부) ;
  • 배규웅 (한국건설기술연구원 건축연구본부) ;
  • 신상민 (한국건설기술연구원 건축연구본부)
  • Received : 2022.08.23
  • Accepted : 2023.01.18
  • Published : 2023.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

At construction sites, interest in the production of precast materials is increasing due to off-site conditions due to changes in construction site conditions due to increased labor costs and the Act on the Punishment of Serious Accidents. In particular, the precast prestressed hollow slab has a hollow shape in the cross section, so structural performance is secured by reducing weight and controlling deflection through stranded wires. With the application of structural standards, the urgency of securing fire resistance performance is emerging. In this study, a fire-resistance cross section was developed by reducing the concrete filling rate in the cross section and improving the upper and lower flange shapes by optimizing the hollow shape in the cross section of the slab to have the same or better structural performance and economic efficiency compared to the existing hollow slab. The PC hollow slab to which this was applied was subjected to a two-hour fire resistance test using the cross-sectional thickness as a variable, and as a result of the test, fire resistance performance (load bearing capacity, heat shielding property, flame retardance property) was secured. Based on the experimental results, it is determined that fire resistance modeling can be established through numerical analysis simulation, and prediction of fire resistance analysis is possible according to the change of the cross-sectional shape in the future.

최근 건설현장은 인건비 상승, 중대재해처벌법 등으로 인한 건설 현장 여건의 변화로 탈현장 여건으로 프리캐스트 부재 생산에 대한 관심이 증대되고 있다. 특히, 프리캐스트 프리스트레스트 중공슬래브는 단면 내 중공형상을 두어, 중량감소 및 강연선을 통한 처짐 제어 등으로 구조성능은 확보하고 있으나, 현재 내화 성능 개선에 대한 미비한 연구 뿐만 아니라, 기업들의 근거 없는 당연내화구조 기준을 적용함에 내화성능 확보에 대한 시급성이 대두되고 있다. 이 연구에서는 기존 중공 슬래브와 비교하여 동등이상 구조성능, 경제성을 갖기 위하여 슬래브단면 내 중공 형상 최적화를 통해 단면 내 콘크리트 충진률 감소 및 상하부 플랜지 형상 개선으로 내화단면을 개발하였다. 이를 적용한 PC 중공 슬래브에 대하여 단면두께를 변수로 하여 2시간 내화시험을 진행하여, 실험결과 내화 성능(하중지지력, 차열성, 차염성)을 확보 하였다. 실험 결과 기반으로, 수치해석 시뮬레이션을 통해 내화모델링을 정립하여, 추후 단면형상 변경에 따라 내화 해석 예측이 가능한 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부 한국건설기술연구원 연구운영비지원(주요사업)사업으로 수행되었습니다(과제번호 20220337-001 OSC 대응 고비탄성 내진용 하이브리드 스플라이스 슬리브 개발).

References

  1. KS F 2257-1. (2019), Methods of fire resistance test for elements of building construction-general requirements. (in Korean).
  2. KS F 2257-5. (2019), Methods of fire resistance test for elemenfs of building construction-Specific requirements for loadbearing horizontal separating elements, Korea Standard Association. (in Korean).
  3. Kim, H., Kim, H., Cho, B., Yeo, I., and Kwon, I. (2011), An Experimental Study on the Fire Behavior of Concrete Void Slab under Standard Fire with Loading Condition, Journal of Korean Institute of Science and Engineering, 25(6), 64-72 (in Korean).
  4. Choi, H., Chung, J., and Choi, C. (2014), Estimation Method of Residual Performance for Hollow Slab at Elevated Temperature, Journal of the Korea Concrete Institute, 26(5), 643-650 (in Korean). https://doi.org/10.4334/JKCI.2014.26.5.643
  5. Min, J., and Woo, Y. (2015), Numerical Study on Fire Performance of Hollow core Slabs, Journal of Korean Association for Spatial Structures, 15(3), 95-102 (in Korean). https://doi.org/10.9712/KASS.2015.15.3.095
  6. KICT. (2022), A Development on the PC Hollow Core Slab with 2hrs Fire Resistance Performance for Residence Building, p.5.
  7. KDS 14 20 80. (2022), Concrete Structure Durability Design Criteria. (in Korean).
  8. ACI 216R-07. (2007), Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies, ACI, pp.1-48.
  9. PCI. (2017), PCI Design Handbook, Design for Fire Resistance of Precast and Prestressed Concrete.
  10. Japanese government. (2000), Construction Notification No. 1399 (Regarding construction methods for fire-resistant structures).
  11. CEN (European Committe for Standardization) Eurocode 2 (2004), Design of Concrete Structures - Part1 -2: Generalrules-Structural fire design.