In this study, the temperature characteristics of a ceiling jet flowing through a ceiling in the event of a fire in a large corridor space were experimentally analyzed to show consistency with the equation shown through the energy conservation equations. The experimental results show that the horizontal temperature distribution of the ceiling jet decreases sharply until the dimensionless distance (r/z) is 0.2, and the vertical temperature distribution increases from a dimensionless height z/H of 0.5. In addition, the consistency between the energy-conservation-law-based prediction formula and experimental values was observed to be good when the heat release rate, ceiling height, and dimensionless distance were used as variables.

This study analyzed the temperature attenuation characteristics of ceiling jets flowing along ceilings in corridor spaces. Full-scale fire experiments were performed using ethanol in a steel-constructed corridor measuring 5 m (W) × 25 m (L) × 5 m (H). The experimental variables were ceiling height and heat release rate. The results indicated that the transition point from turbulent to laminar flow in the ceiling jet was governed by the ceiling height. Based on a review of experimental results obtained in previous studies using correlation equations derived from the conservation laws, a set of predictive equations is proposed. These predictive equations exhibit attenuation trends consistent with the correlations presented by Oka. However, the dimensionless temperature was slightly overestimated, which is attributed to the thermal insulation properties of the materials comprising the ceiling and sidewalls.

In this study, the velocity characteristics of ceiling jets propagating through horizontal corridors, serving as evacuation routes during large-scale building fires, were analyzed using experiments, simulations, and a theoretical approach based on conservation laws. A correlation was developed through dimensionless analysis to ensure applicability across different spatial scales. The validity of the proposed equation was assessed by comparing it with existing velocity prediction methods for tunnel fires as well as experimental data from corridor fire tests conducted at multiple scales. While the correlation derived in this study tended to predict higher velocities than models developed for road tunnel ceiling jets, it demonstrated relatively high accuracy when compared with experimental results from corridor fires across different scales.

Spray-on fireproofing materials (SFRMs) and intumescent paints are commonly used to enhance the fire resistance of steel structures. Despite extensive studies on the performance of SFRMs and intumescent paints, there remains a significant lack of research on the material properties of certified products used in real-world applications, especially according to exposed temperatures. In this study, heating experiments were conducted to investigate the material properties of two widely used certified materials in Korea, focusing on their application thickness and exposure temperature. The experiments set target temperatures ranging from room temperature to 900 °C in increments of 100 °C. Additionally, various material properties, such as changes in shape and the insulation performance of the SFRM and intumescent paint, were observed at each temperature. Notably, the moisture content and discoloration depth of the SFRM displayed a consistent trend under different exposure temperatures, a material property that has not been previously reported. Furthermore, the insulation performance of the two materials differed by approximately 17% to 25% compared to an uncoated specimen exposed to the same temperature. The findings on the properties of SFRMs and intumescent paint relative to the exposure temperature presented in this study can serve as valuable data for selecting materials to improve fire resistance performance across various construction sites in the future. Additionally, they can act as key reference data in the diagnostic evaluation process for assessing the impact of fire on steel structures.

1. 서 론 건축물에서 화재확산을 억제하기 위한 방법으로는 2차 점화원의 제거나 내부

Owing to recent factory fires in industrial complexes, fire safety measures are being prepared nationally. Accordingly, this study conducted an analysis of related laws and literatures to identify fire risk factors for factories in industrial complexes as part of the development of fire prediction, control, and response technologies. Through this, the definition and classification system for industrial complexes, application of fire safety measures, fire risk factor identification methods and processes, and fire characteristics and protection measures for factories in industrial complexes were examined. The review results confirmed that the buildings corresponding to factories in industrial complexes were large, and the facilities were of Type 3. Based on this, the scale and scope of buildings located in fire risk blind spots in factories within industrial complexes were set to be less than 5,000 m2 in total floor area and no more than 10 stories (less than 33 m in height). In addition, in & exterior of protection and risk (IEPR) analysis using strengths, weaknesses, opportunities, threats (SWOT) analysis was proposed to select fire risk factors for factories in industrial complexes. In conclusion, the following four fire risk factor selection models were proposed through matrix creation: fire risk, life safety, fire spread, and fire protection.