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General Article

Analysis of post-fire residual strength of sandwich panels based on core type and sectional shape
Bohyuk Lim1
,
Hyungmin Seo1
,
Jiyoung Lee1
,
Daewoong Jung2
,
Heedu Lee3
,
Minkoo Kim4*
1Resercher, Fire Lab, AMI Inc, Chungju, South Korea
2Manager, Department of Production , YoungHwa Inc, Daegu, South Korea
3Professor, Department of Fire Protection Engineering, Pukyong National University, Busan, South Korea
4Professor, Department of Architectural Engineering, ChungBuk National University, Chungju, South Korea
*Corresponding Author
31 March 2025. pp. 58-69
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Abstract

Sandwich panels are commonly used as roofing materials in warehouses and factories due to their durability and insulation properties. However, the organic-based core of sandwich panels is susceptible to combustion, which can result in a considerable reduction in strength and stiffness in the event of a fire. In the current system, there are no post heating procedures following a fire test. However, determining the residual strength of thermally affected sandwich panels is crucial for ensuring the safety of firefighters extinguishing fire on top of the roof. In this study, the transverse load tests were conducted on fire-damaged specimens to find out the residual strength of urethane panels representative of organic cores following exposure to fire. The residual strength of urethane panels with three different cross-sections was determined with heating times of 10, 20 and 30 minutes. The test results showed that the residual strength of the urethane panel was superior in the order of S-1 (Roof Type), S-3 (Edge Type), and S-2 (Deck Type), which was consistent with the order of the moment of inertia of the upper steel plate, but the relationship with the increase in heating time was not confirmed. However, comparing the test results to the roofing material strength criteria of KS F 1010 (1/100 load of maximum deflection), it was found that at a heating time of 10 minutes, the residual strength exceeded the criteria for all section types, but at higher heating times, most fell short of the criteria. This study confirmed that 1) the residual strength of sandwich panels depends on the cross-sectional properties of the top steel sheet regardless of the heating time, 2) the residual stiffness is determined by the heating time, and 3) finally, the need to establish a post-heating procedure of sandwich panels for residual strength measurement.

Keywords
sandwich panels
flexural performance
residual strength
organic core
urethane panel
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Information
  • Publisher :Sustainable Building Research Center (ERC) Innovative Durable Building and Infrastructure Research Center
  • Publisher(Ko) :건설구조물 내구성혁신 연구센터
  • Journal Title :International Journal of Sustainable Building Technology and Urban Development
  • Volume : 16
  • No :1
  • Pages :58-69
  • Received Date : 2025-02-18
  • Accepted Date : 2025-03-17
  • DOI :https://doi.org/10.22712/susb.20250005
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