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Design method for fire protection of steel structures based on measurement of fire heat release rate

A technology of heat release rate and protection design, applied in the direction of calculation, material heat development, special data processing applications, etc., can solve the problems that cannot truly reflect the impact of fire resistance, many calculation steps, long calculation time, etc., to achieve convenient calculation, The method steps are simple and the effect is convenient

Active Publication Date: 2017-04-12
XIAN UNIV OF SCI & TECH
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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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  • Design method for fire protection of steel structures based on measurement of fire heat release rate
  • Design method for fire protection of steel structures based on measurement of fire heat release rate
  • Design method for fire protection of steel structures based on measurement of fire heat release rate

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Embodiment Construction

[0046] Such as figure 1 A fire protection design method for steel structures based on the measurement of fire heat release rate is shown, including the following steps:

[0047] Step 1. Determination of design parameters: according to the design fire resistance rating of the building where the steel structural member needs to be designed for fire protection, determine the fire resistance limit n of the steel structural member; and combine the steel structural member in the building where it is located The layout position in the building is determined by the height z of the steel structural member above the fire source below it; wherein, the unit of n is h (hour), and the unit of z is m.

[0048] Wherein, the designed fire resistance level of the building is the pre-designed fire resistance level of the building. Fireproof rating, Fireproof endurance rating, is a grading scale to measure the fire resistance of buildings. The fire resistance rating of buildings is one of the mo...

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Abstract

The invention discloses a steel structure fire protection design method based on fire heat release rate measurement, comprising steps: 1. Determination of design parameters; 2. Measurement of heat release rate; Calculation of surface temperature: 301. Correction of heat release rate; 302. Calculation of temperature at fire source; 303. Calculation of outer surface temperature of fire protection layer of steel structural members; 4. Calculation of comprehensive coefficient of test section-material; 5. Actual section-material Calculation of comprehensive coefficient: Calculate the actual cross-section-material comprehensive coefficient α′t according to the similarity relationship; 6. Determine the minimum thickness of the steel structure fire protection layer design. The method of the invention has simple steps, reasonable design, convenient implementation and good use effect, and can solve the problem of many calculation steps and long calculation time in the existing calculation method of the protective layer thickness of steel structures, which inevitably produces iteration errors and cannot truly reflect the impact of actual fires. The impact of steel structure fire resistance and other issues.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01N25/22
Inventor 吴文忠
Owner XIAN UNIV OF SCI & TECH
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