Experimental study on fire protective coating for steel structures

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Experimental study on fire protective coating for steel structures


Author: Dong, Xue
Title: Experimental study on fire protective coating for steel structures
Degree: M.Sc.
Year: 2012
Subject: Building, Iron and steel -- Fires and fire prevention.
Protective coatings
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xiii, 117, 3 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2551469
URI: http://theses.lib.polyu.edu.hk/handle/200/6921
Abstract: Steel structure buildings take the advantages of fast construction, low construction cost, good stability, good ductility and hence high flexibility in shape with high utilization rate. Structures with large span and high volume space for irregular shape can be constructed. With the rapid growth in economy, steel structure is popularly used in modern architecture, particularly in very tall buildings. However, the fire resistance of steel structure is not as good as other structural materials such as concrete structure and brick and stone masonry structure. Mechanical strength of steel is reduced while increasing the temperature. When the temperature of steel reaches the critical temperature, it cannot support the structure. Therefore, steel structure is protected by coating. In this project, fire protective coatings for steel structures will be studied together with fire tests. In general, fire prevention measures for steel structures are used with two types, the persuasion method and the retain method. The persuasion method is mainly used in the columns. The thickness of fire coating for steel structure is one of the important indicators of refractory performance. Common product testing standards such as those in China take this as a key element of building structures. The refractory limits of covering parts are related to the material structure level, structure and coating construction technology, maintenance condition, and state regulation. Even for the same kind of steel structure fire coatings with the same process and coating thickness, the refractory limit will be different if the shape, size and the structure of steel components are different. Measured results from standard tests cannot be applied in the real design directly. Consequently, safety and reliability of the steel structure fire coatings are the major concerns. With the performance requirements of refractory steel structure, specifying only the coating thickness is not adequate. In this dissertation, typical steel used in the industry were selected for experiments with their structural characteristics investigated first. Proper experimental data acquisition was designed. Characteristic parameters of fire protective coatings were then studied. A new standard is proposed from this result to test the fire protective coating for steel structures without conducting fire test on each steel structure. This would reduce the time of testing and valuable resources.

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