巻号一覧
43 巻 (2024)
- 2 号 p. 25-
- 1 号 p. 1-
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Jun Yan, Chao Zhang, Mamoru Kohno2024 年 43 巻 2 号 p. 25-44
発行日: 2024年
公開日: 2024/10/26
ジャーナル フリーFire test data on protected columns made of high strength structural steel (HSSS) are lacking but required for developing and validating analytical models for fire resistance design. To address this data gap, this paper carried out furnace tests on HSSS short columns protected by intumescent coating (IC). H and box section columns made of China grade steels of Q550, Q690 and Q890 were protected by different thicknesses of IC and subjected to the standard ISO834 fire and a realistic fire condition. Temperatures of the columns were measured, and the performances of the IC were evaluated. The study finds that the steel grade used has negligible impact on the temperature response of the steel column. The insulation performance of IC varies in different fire conditions. Under the realistic fire condition, the ICs underwent more complete reaction, generated thicker charring layers, and had better thermal insulation performance. For the investigated cases, ICs significantly reduced the temperature rise rates of the HSSS columns that the temperature rise rates stayed at 5-10°C/min after the steel temperatures reached 200°C. Furthermore, the study shows that the behaviors of IC applied on the steel members are much more complex than that of the IC applied on steel plate. Specifically, detachment of charred layers from the steel surface, a phenomenon not observed in previous studies on steel plates, was observed in this research.抄録全体を表示PDF形式でダウンロード (9949K) -
Sayaka Furumoto, Masaya Toyokita, Taiga Kimura, Atsuro Umi, Naoto Kata ...2024 年 43 巻 2 号 p. 45-57
発行日: 2024年
公開日: 2024/10/26
ジャーナル フリーThe frequency and magnitude of wildfires are increasing because of global warming. Increasing temperatures and decreasing precipitation owing to global warming cause dryness, which increases the risk of wildfires. In addition, increased greenhouse gas emissions increase the likelihood of occurrence of extreme temperatures, thereby contributing to fires. Furthermore, wildfires cause air pollution over large areas, spread toxins, including PM2.5 and ozone, and increase health risks. Emissions of CO2 in 2021 were the largest on record, largely because of wildfires in North America and Siberia. These impacts need to be regulated as these are detrimental to the natural environment and can cause respiratory and cardiovascular diseases.抄録全体を表示PDF形式でダウンロード (1540K) -
Takashiro Akitsu2024 年 43 巻 2 号 p. 59-81
発行日: 2024年
公開日: 2024/10/26
ジャーナル フリーThis study discusses the fire safety of transition metals and compounds by comparing them with specific theories of elements and application examples. For a descriptive chemistry course on transition metals at the university, we solicited essays from undergraduate students on their favorite elements, their properties, and the students’ impressions of these elements regarding fire safety. The d- and f-block elements that generated the greatest interest were selected. The chemical properties and application examples of these elements are described. However, only a few essays were related to fire safety or fires. The connection between elemental chemistry and fire is explored by comparing safety data sheet components and the chemical properties of transition metals.抄録全体を表示PDF形式でダウンロード (738K)
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