Numerical Analysis Study on Membrane Action Focusing on Differences in the Direction of Unprotected Secondary Beams in a Composite Flooring System Exposed to Fire

• 발행기관: 한국화재소방학회
• 저자명: Kisei Shimono Haruka Kanada Moe Horie Takeo Hirashima Kei Kimura Yusuke Shintani
• 간행물 정보: 『International Journal of Fire Science and Engineering』Vol. 39, No. 2, 135~147쪽, 전체 13쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2025.06.30

국문 초록

The purpose of this study was to investigate the membrane action in a fire of a flooring system consisting of a deck composite slab and an unprotected secondary beam. Thermal stress analysis was carried out for two different cases where an unprotected secondary beam was placed in the direction of the long span (long direction) and in the direction of the short span (short direction). The influence of the direction of the unprotected secondary beam on the deflection behavior of the flooring system and the stresses in the welded wire mesh were analyzed. The analysis was carried out on a previous large-scale fire test. The results indicated that when an unprotected secondary beam was placed in long direction, the deflection was larger at an early stage, and the membrane action developed earlier. From the middle of the heating process, the deflection behavior was almost identical when the unprotected secondary beam was placed in the long and short direction. During this period, the stresses in the welded wire mesh in the long direction were larger than in the short direction. In the ultimate state, the stresses in the welded wire mesh in the long direction were smaller when an unprotected secondary beam were placed in the long direction compared to that in the short direction.

목차

1. Introduction

2. Analysis Method

3. Analysis Result

4. Conclusion

References

키워드

Composite flooring system Fire resistance Membrane action Direction of unprotected secondary beams Numerical analysis