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Considering the fact that constructional steel loses half of its thermal resistance under a certain temperature of a range of 550-550 C, therefore, as per UL 263 and ASTM-E119 international standards, the thickness of spraying fireproof substance shall be made for all the sections to strengthen the structure. Whereas using these standards as per the structures used in Iran is subject to various opinions among engineers, here it has been tried that a certain part of these relations in proportion to the structures used in Iran shall be examined theoretically and practically.

Evaluation of Cementitious Fire Resistive Material in Steel Structures using UL 263 International Standards