Abstract
The research introduces a methodology of establishing indicators of fire safety of a building in relation to a guaranteed duration of steel fire-proof corrugated beams resistance in conditions of standard fire tests. Indicators of fire safety are also established in the assessment of design limits of steel fire-proof corrugated beams during design process, construction or maintenance of the building as well as in reducing economic costs when testing steel structures for fire resisting property. The suggested methodology introduces the system of actions aimed to design constructive fire protection of steel corrugated beams of buildings. Technological effect is achieved by conducting firing tests of steel construction by non-destructive methods; the evaluation of fire resistance of fire-proof elements of corrugated beams (corrugated web, upper and lower shelves) is identified by the least fire-proof element of a welded I-beam. In this methodology fire resistance duration of the constituent elements of a welded I-beam with account of its fire protection ability is described with an analytic function taken as variables. These variables are intensity strength of stresses and the degree of fire protection of a compound element.
Highlights
A steel beam with a flexible wall, in which a corrugated web works beyond the range of stability, is referred to new types of structures due to its efficient constructive form
Evaluation of fire resistance of steel fire-proof corrugated beam of a building suggested in the author's methodology should be conducted without exposure to high temperatures of non-destructive testing but by using a complex of single indicators of the quality of steel structures
The duration of fire resistance of a corrugated web, bottom and top shelves of a welded I-beam is calculated; the least stable element of a welded I-beam at the minimum duration of fire resistance effects of corrugated webs and bottom or top shelves of a welded I-beams with account of fire protection is pointed out, The design limit of fire resistance Fur,min, of a steel fire-proof corrugated beam according to its loss of bearing ability is determined by the duration of fire resistance effects of compound elements of a welded I-beam according to its statical and heat-resistant characteristics rus, min, min; that is
Summary
A steel beam with a flexible wall, in which a corrugated web works beyond the range of stability, is referred to new types of structures due to its efficient constructive form. The researchers studied different methods of fire protection and fire resistance evaluation (GOST R 53309-2009) of effective steel beam structures in ASI SGTU, carried out thematic patent search, set the level of technological development, the scope and novelty of the research object, defined analogies (GOST 30247.1-94) and the prototype [1] of a new technical solution [2]. The need for assessment of fire resistance of steel fire-resistant corrugated beams occurs during reconstruction of buildings or structures (hereinafter referred to as ‘buildings’), strengthening their parts, bringing the actual fire-resistant steel beams in accordance with modern requirements of the Federal Law (Federal Law No 123-08): "Technical regulations of fire safety requirements (with 2012 amend.) during the examination and/or repair of steel constructions of the building after the fire"
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