• Structural Engineering and Mechanics
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• v.78 no.1
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• pp.67-75
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• 2021

This work studies the behaviour of a steel portal frame selection under fire exposure, considering both span lengths and fire exposure times as variables. Such structures combine carbon steel (S275), fireproof micro-alloyed steel (FR), and coatings of intumescent paint with variable thicknesses, improving thereby the flame retardant behaviour of the steel structure. Thus, the main contribution of this study is the optimization of the portal frames by combining both steels, analysing the resulting costs influence on the final dimensions. Besides, the topological optimization of each steel component within the structure is also defined, in accordance with the following variables: weather conditions, span, paint thickness, and cost of steel. The results mainly confirmed that using both FR and S275 grades with intumescent painting is the Pareto optimum when considering performance, feasibility and costs of such portal frames widely used for industrial facilities.

• Special Issue of the Society of Naval Architects of Korea
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• 2009.09a
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• pp.18-23
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• 2009

After the installation of electric cables at block, PE(pre-erection) and hull stages, the coating stains on the electric cable sheath were unavoidably occurred by additional painting process. According to class rules paint or coating applied on the electric cables shall not adversely affect the mechanical, chemical of fire resistant characteristics of the electric cable sheath. However, there has not been quantitatively studied about the effect of coating stains on properties of sheath materials. In this study, we tried to investigate the effect of coating stains on the performance and deterioration of sheath materials by using FTIR, SEM analysis, flame retardant, high potential voltage and tensile test. The results sowed that coating stains, which were occurred during painting work on site could not adversely affect on the performance and deterioration of sheath materials.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.336-338
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• 2008

본 연구에서는 EU에서 발효되는 6대 규제유해물질(Pb, Hg, Cd, $C^{6+}$, PBB/PBDE)과 환경부 규제유해물질에 의해 도료의 유해조성물질을 제한하게 됨에 따라 VOC(휘발성유기화합물) 배출이 적고, 브롬계/할로겐계를 탈피하여 인체안전성 확보 및 환경오염을 최소화하며, 방염제 형식승인 및 검정기술기준 (KOFEIS 0201)에 부합하는 수용성 유 무기계 난연도료를 개발하였다. 친환경적인 난연도료 제조에 대한 최적조건으로 Mg(OH)$_2$, $Sb_2O_3$, 붕산아연을 1:2:2로 혼합한 난연제 그리고 바인더(마이셸 2%)와 물의 비율을 1:1로 제조한 후, 난연제:(바인더+물)을 1:1로 제조한 난연도료 3의 성능이 가장 우수하였다.