Steel structure fire protection design method based on fire heat release rate measurement

Abstract

The invention discloses a steel structure fire protection design method based on fire heat release rate measurement. The method includes the steps of 1, determining design parameters; 2, measuring heat release rate; 3, calculating the temperature of the outer surface, which plumes rise to, of a fire protective layer of a steel structural member, to be specific, 301, correcting the heat release rate, 302, calculating the temperature of a fire source place, and 303, calculating the temperature of the outer surface of the fire protective layer of the steel structural member; 4, calculating a test section-material comprehensive coefficient; 5, calculating an actual section-material comprehensive coefficient, to be specific, calculating the actual section-material comprehensive coefficient Alpha't according to a similarity relation; and 6, determining a minimum design thickness of the fire protective layer of the steel structural member. The method has the advantages that the steps are simple, the design is reasonable, implementing is convenient, effect is good, and well solved are such problems of the existing methods of calculating thickness of the protective layer of the steel structure that the process includes many steps, calculating time is long, iteration errors are unavoidable, and the influence of an actual fire upon the fire tolerance of the steel structure is not truly reflected.

Description

technical field [0001] The invention belongs to the technical field of fire protection design for steel structures, in particular to a fire protection design method for steel structures based on fire heat release rate measurement. Background technique [0002] Steel is a non-combustible material, but under fire conditions, the exposed steel structure has very little strength when the temperature exceeds 550°C, and it will collapse and fail within ten minutes. Steel for construction can be divided into two types: steel for steel structure (various profiles, steel plates) and steel for reinforced concrete structure. It is called the thickness and structural size of the refractory protective layer. The existing method of calculating the thickness of the fire protection layer is to iteratively solve the heat conduction differential equation of the steel structure in the fire resistance test of the time-temperature standard curve, that is, to carry out the fire resistance test o...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a steel structure fire protection design method based on the measurement of fire heat release rate in view of the deficiencies in the above-mentioned prior art. The method has simple steps, reasonable design, convenient implementation, and good use effect. Solve the problems existing in the existing calculation method of the protective layer thickness of steel structures, such as many calculation steps, long calculation time, inevitable iteration errors, and inability to truly reflect the impact of actual fires on the fire resistance of steel structures

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