Method and apparatus for evaluating effect of suppressing temperature rise of fireproofing structure

Abstract

To provide an evaluation method and an evaluation device of a temperature rise suppression effect of a fire resistant coating structure capable of easily evaluating the temperature rise suppression effect when a low radiation paint is applied.SOLUTION: An evaluation method for evaluating an effect of suppressing a temperature rise of a steel frame beam by a low-emissivity coating material in a fireproof covered structure including the steel frame beam, a fireproof covering material, and the low-emissivity coating material, the evaluation method comprising: The method includes a step of performing heat transfer analysis on the fireproof covered structure to obtain in advance a relationship between a temperature rise reduction ratio and a ratio between an inner circumferential length of the fireproof covering material and a cross-sectional area of the steel frame beam, a step S1 of setting an inner circumferential length of the fireproof covering material and a cross-sectional area of the steel frame beam to be evaluated, a step S2 of applying the set inner circumferential length of the fireproof covering material and cross-sectional area of the steel frame beam to the relationship obtained in advance to obtain the temperature rise reduction ratio of the fireproof covered structure to be evaluated, and a step S3 of evaluating the temperature rise suppression effect.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for evaluating the temperature rise suppression effect of a fire-resistant covering structure. [Background technology]

[0002] Conventionally, a fire-resistant coating method for steel beams has been the box-lining method, in which the outside of the steel frame is covered with a fire-resistant coating material in a box shape, and this method is widely used due to its excellent workability. The box-lining method can improve the fire resistance of the steel beams by reducing the heat transfer caused by radiation from the fire-resistant coating material to the steel beams due to fire and suppressing the temperature rise of the steel beams. Known conventional techniques for reducing the heat transfer caused by radiation from the fire-resistant coating material to the steel beams include a method of increasing the thickness of the fire-resistant coating material or layering it in layers to suppress the temperature rise of the parts facing the steel beams (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-1344 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, the thickness of the fire-resistant covering material increases in accordance with the fire resistance performance, which may result in design restrictions such as a reduction in ceiling height, etc. For this reason, there has been a demand for technology that can improve fire resistance performance without increasing the thickness of the fire-resistant covering material.

[0005] In order to solve these problems, the present inventors have devised a fire-resistant coated structure as shown in Fig. 3. As shown in this figure, this fire-resistant coated structure 10 comprises steel beams 12, fire-resistant coating material 14 that coats the outside of the steel beams 12 in a box-like manner, and low-emissivity paint 16 that is applied to the surfaces of the steel beams 12, so that the combined emissivity of the surfaces of the fire-resistant coating material 14 facing the steel beams 12 and the surfaces of the steel beams 12 is 0.2 or less.

[0006] The steel beam 12 is made of an H-shaped steel beam having a web 20, an upper flange 22, and a lower flange 24. A flooring material 26, such as concrete or ALC, is provided on the upper surface of the upper flange 22. The fire-resistant coating material 14 can be made of a molded inorganic material. Examples of such inorganic materials include calcium silicate board, gypsum board, and rock wool blanket. The fire-resistant coating material 14 is preferably one that will not fall off in a fire that lasts for about one hour, and is preferably 15 mm or thicker. The fire-resistant coating material 14 is not in close contact with the steel beam 12, but is arranged in a U-shape when viewed horizontally around the sides and lower periphery of the steel beam 12, excluding the upper part, and a space (cavity layer 28) is formed between the fire-resistant coating material 14 and the steel beam 12. The low-emissivity paint 16 is applied to the surface of the steel beam 12, excluding the upper surface of the upper flange 22. The low-emissivity paint 16 is a low-emissivity paint, and for example, a solvent-based resin paint containing an aluminum pigment can be used. The surface coated with this low-emissivity paint 16 becomes a mirror-like finish, resulting in a low-emissivity surface. The low-emissivity paint 16 is preferably a low-emissivity paint that reduces the emissivity of the steel beam 12 to 0.2 or less after application and is also heat-resistant. The thickness of the low-emissivity paint 14 does not affect the emissivity, but a standard thickness of approximately 10 μm may be used. Furthermore, the low-emissivity paint 16 is not limited to the surface of the steel beam 12. Applying the low-emissivity paint 16 to at least one of the surfaces of the steel beam 12 and the fire-resistant coating material 14 can achieve the same effect as applying the low-emissivity paint 16 to the surface of the steel beam 12.

[0007] According to the above-described fire-resistant coated structure 10, it is possible to improve the fire resistance performance without increasing the thickness of the fire-resistant coating material 14. In such a structure, to evaluate the temperature rise suppression effect of applying low-emissivity paint 16, it is necessary to set the shapes and dimensions of the steel beams 12 and the fire-resistant coating material 14, build an analytical model corresponding to the set shape, perform a thermal conduction numerical analysis, and visualize and display the analysis results. However, these tasks require a great deal of time and effort.

[0008] Therefore, in order to develop a simple and time-saving evaluation method, the inventors conducted a heat conduction analysis of the above-mentioned fire-resistant coated structure 10. In the analysis, an analytical model of a steel beam 12 covered in a box-like manner with 15 mm-thick calcium silicate boards (fire-resistant coating material 16) was heated for one hour, and the maximum temperature of the analytical model was calculated. The analytical method used was one-dimensional heat conduction analysis using the finite difference method, and the steel beam 12 was considered to be a concentrated mass point. The heating was performed in accordance with the standard heating curve specified in ISO 834, as shown in Figure 4.

[0009] The overall emissivity of the steel beam 12 coated with the low-emissivity paint 16 and the fire-resistant coating material 14 is set to 0.2. The overall emissivity is expressed by the following formula (1), where ε eff is the total emissivity, ε i is the emissivity of the fire-resistant coating material 14, ε s is the emissivity of the steel beam 12 after the low-emissivity paint 16 is applied.

[0010]

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[0011] The analysis conditions are the shape and dimensions of the steel beam 12, the separation distance d between the steel beam 12 and the fire-resistant covering material 14, and the inner perimeter H of the fire-resistant covering material 14. i , cross-sectional area A of steel beam 12 s The analysis conditions are listed in Fig. 5. As a result of the analysis, the temperature rise reduction rate R of the steel beams due to the application of low-emission paint was d and the inner perimeter of the fireproof coating material H i and the cross-sectional area of ​​the steel beam A sThe relationship between the ratio of the temperature rise reduction rate R and the temperature rise reduction rate R is obtained. This relationship is plotted in Figure 6. The figure also shows the regression line and the regression equation obtained by regression analysis of the plot. As is clear from this regression equation, d It can be seen that this is expressed by the following relational expression (2).

[0012]

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[0013] however, R d : Reduction rate of temperature rise of steel beams by applying low-emission paint, T s.h : Maximum temperature (℃) of steel beams without low-emissivity paint during fire T s.l : Maximum temperature (℃) of steel beams coated with low-emissivity paint during fire T s.i : Initial temperature of steel beam (℃), H i : Inner circumference of fireproof covering material (m), A s : Cross-sectional area of ​​steel beam (m 2 )

[0014] Therefore, the dimensional relationship between the fireproof covering material and the steel beam (H i / A s ) is known, the temperature rise reduction rate R of the steel beam when low-emissivity paint is applied can be calculated using the above formula (2). d In addition, the maximum temperature T of a steel beam in the event of a fire without the application of low-emissivity paint can be estimated. s.h and the initial temperature of the steel beam T s.i If this is known, the maximum temperature T of the steel beam coated with low-emissivity paint during a fire can be calculated using the above formula (2). s.l The present inventors have found these things and arrived at the following invention.

[0015] The present invention has been made in consideration of the above, and aims to provide a method and an evaluation device for evaluating the temperature rise suppression effect of a fire-resistant coating structure, which can easily evaluate the temperature rise suppression effect when low-emission paint is applied. [Means for solving the problem]

[0016] In order to solve the above-mentioned problems and achieve the object, the method for evaluating the temperature rise suppression effect of a fire-resistant coated structure according to the present invention is a method for evaluating the temperature rise suppression effect of a fire-resistant coated structure comprising a steel beam, a fire-resistant coating material covering the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to at least one surface of the steel beam and the fire-resistant coating material, using a computer, the method comprising: performing a heat conduction analysis of the fire-resistant coated structure; and calculating a temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint. and a step of evaluating the temperature rise suppression effect based on the obtained temperature rise reduction rate.

[0017] The apparatus for evaluating the effect of suppressing temperature rise of a fire-resistant coated structure according to the present invention is an evaluation apparatus that uses a computer to evaluate the effect of suppressing temperature rise of a fire-resistant coated structure that includes a steel beam, a fire-resistant coating material that coats the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to at least one surface of the steel beam and the fire-resistant coating material, and evaluates the effect of suppressing temperature rise of the steel beam by the low-emissivity paint, which is obtained by a heat conduction analysis of the fire-resistant coated structure, by comparing the temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint and the temperature rise reduction rate of the fire-resistant coated structure. and a cross-sectional area of ​​the steel beam; an input means for setting the inner perimeter of the fire-resistant coating material and the cross-sectional area of ​​the steel beam in the fire-resistant coated structure to be evaluated; a calculation means for calculating the temperature rise reduction rate of the fire-resistant coated structure to be evaluated by applying the inner perimeter of the fire-resistant coating material and the cross-sectional area of ​​the steel beam set by the input means to the relationship stored in the storage means; and an evaluation means for evaluating the temperature rise suppression effect based on the calculated temperature rise reduction rate. [Effects of the Invention]

[0018] According to the method for evaluating the temperature rise suppression effect of a fire-resistant coated structure of the present invention, the method is a method for evaluating the temperature rise suppression effect of a fire-resistant coated structure comprising a steel beam, a fire-resistant coating material covering the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to at least one surface of the steel beam and the fire-resistant coating material, using a computer, and includes a step of performing a heat conduction analysis of the fire-resistant coated structure to obtain in advance the relationship between the temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint and the ratio of the inner periphery of the fire-resistant coating material to the cross-sectional area of ​​the steel beam. the step of applying the set inner perimeter length of the fire-resistant coating material and the cross-sectional area of ​​the steel beam in the fire-resistant coated structure to be evaluated to the previously obtained relationship to determine the temperature rise reduction rate of the fire-resistant coated structure to be evaluated; and the step of evaluating the temperature rise reduction effect based on the determined temperature rise reduction rate, thereby achieving the effect of easily evaluating the temperature rise reduction effect when low-emission paint is applied to the surface of at least one of the steel beam and the fire-resistant coating material.

[0019] Furthermore, the device for evaluating the effect of suppressing temperature rise of a fire-resistant coated structure according to the present invention is an evaluation device that uses a computer to evaluate the effect of suppressing temperature rise of a fire-resistant coated structure that includes a steel beam, a fire-resistant coating material that coats the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to at least one surface of the steel beam and the fire-resistant coating material, and includes: a storage means for storing a relationship between a temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint, which is obtained by a heat conduction analysis of the fire-resistant coated structure, and a ratio of the inner periphery length of the fire-resistant coating material to the cross-sectional area of ​​the steel beam; The system is equipped with an input means for setting the inner perimeter of the fire-resistant coating material and the cross-sectional area of ​​the steel beam in the fire-resistant coated structure to be evaluated, a calculation means for applying the inner perimeter of the fire-resistant coating material and the cross-sectional area of ​​the steel beam set by the input means to the relationship stored in the memory means to determine the temperature rise reduction rate of the fire-resistant coated structure to be evaluated, and an evaluation means for evaluating the temperature rise suppression effect based on the determined temperature rise reduction rate, thereby achieving the effect of easily evaluating the temperature rise suppression effect when low-emission paint is applied to the surface of at least one of the steel beam and the fire-resistant coating material. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic flow chart showing an embodiment of a method for evaluating the temperature rise suppression effect of a fire-resistant covering structure according to the present invention. [Figure 2] FIG. 2 is a schematic diagram showing an embodiment of an apparatus for evaluating the temperature rise suppression effect of a fire-resistant covering structure according to the present invention. [Figure 3] FIG. 3 is a vertical cross-sectional view showing a fire-resistant covering structure that is the subject of evaluation in the present invention. [Figure 4] FIG. 4 shows the ISO834 standard heating curve. [Figure 5] FIG. 5 is a table showing the analysis conditions. [Figure 6] FIG. 6 is a diagram showing the analysis results. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of a method and an apparatus for evaluating the temperature rise suppression effect of a fire-resistant covering structure according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiment.

[0022] (fire-resistant coating structure) First, a fire-resistant coated structure to be evaluated in accordance with an embodiment of the present invention will be described. As shown in Figure 3, this fire-resistant coated structure 10 has steel beams 12, fire-resistant coating material 14 that coats the outside of the steel beams 12 in a box-like manner, and low-emissivity paint 16 that is applied to the surface of the steel beams 12. The steel beams 12, fire-resistant coating material 14, and low-emissivity paint 16 are as described above. The emissivities of the steel beams 12, fire-resistant coating material 14, and low-emissivity paint 16 are set so that the total emissivity of the surface of the fire-resistant coating material 14 of the fire-resistant coated structure 10 that faces the steel beams 12 and the surface of the steel beams 12 is 0.2 or less. The total emissivity is calculated by ε i Substituting the emissivity corresponding to the fire-resistant coating material 14 (if the low-emissivity coating material 16 is applied, the emissivity of the fire-resistant coating material 14 after application) into ε s The calculation can be performed by substituting the emissivity corresponding to the steel beams 12 (the emissivity of the steel beams 12 after coating with low-emissivity paint 16, if any) into the above. With this fire-resistant coated structure 10, it is possible to improve the fire resistance performance without increasing the thickness of the fire-resistant coating material 14.

[0023] (Evaluation method) Next, an embodiment of the method for evaluating the temperature rise suppression effect of a fire-resistant covering structure according to the present invention will be described. The method for evaluating the temperature rise suppression effect of a fire-resistant coated structure according to this embodiment is a method for evaluating the temperature rise suppression effect of the low-emissivity paint 16 of the fire-resistant coated structure 10 on the steel beams 12 using a computer, and is executed in accordance with steps S1 to S3 of FIG. 1. In the following explanation, an example will be given in which the fire-resistant coating material 14 is made of a calcium silicate board with a thickness of 15 mm and an overall emissivity of 0.2. It is also assumed that the above relational expression (2) has been obtained in advance by performing a heat conduction analysis using a computer. This relational expression corresponds to the relationship between the temperature rise reduction rate of the steel beams 12 due to the application of the low-emissivity paint 16 and the ratio of the inner perimeter of the fire-resistant coating material 14 to the cross-sectional area of ​​the steel beams 12 (the temperature rise suppression effect evaluation expression).

[0024] First, in step S1, the shape and dimensions of the fire-resistant covering structure 10 to be evaluated are set. Based on the set shape and dimensions, the computer calculates the inner perimeter H of the fire-resistant covering material 14. i and the cross-sectional area A of steel beam 12 s This will determine the inner perimeter H i and cross-sectional area A s Instead of a computer, a human determines the inner circumference H i and cross-sectional area A s and inputting the set value into the computer.

[0025] In the next step S2, the computer calculates the set inner circumference length H i and cross-sectional area A s From this, the ratio (H i / A s ) is calculated. Furthermore, the computer calculates the calculated ratio (H i / A s ) into the above relational expression (2), the temperature rise reduction rate R of the steel beam 12 due to the application of the low-emission paint 16 is obtained. d Using the relation (2), the temperature rise reduction rate R d can be easily estimated.

[0026] In the next step S3, the computer calculates the calculated temperature rise reduction rate R dIn this case, for example, the maximum temperature T of the steel beam 12 in the event of a fire when the low-emission paint 16 is not applied is added to the above relational expression (2). s.h and the initial temperature T of steel beam 12 s.i By substituting the above, the maximum temperature T of the steel beam 12 coated with low-emissivity paint 16 during a fire can be calculated. s.l In this way, it is possible to estimate the effect of applying the low-emission paint 16 on the suppression of temperature rise in the steel beam 12. In addition, if the low-emission paint 16 is not applied, the maximum temperature T s.h For example, a temperature estimated in advance by a heat conduction analysis or a fire resistance test can be used as the initial temperature T s.i For example, the room temperature expected in the installation environment can be used as the temperature.

[0027] As described above, according to this embodiment, by using the above-mentioned relational expression (2), it is possible to easily evaluate the temperature rise suppression effect when the low-emissivity paint 16 is applied. Therefore, it is possible to effectively apply the low-emissivity paint 16 to the fire-resistant coated structure 10.

[0028] In the above embodiment, the evaluation target is a fire-resistant coated structure 10 in which low-emissivity paint 16 is applied to the surface of steel beams 12. However, the present invention is not limited to this. Instead of applying low-emissivity paint 16 to the surface of steel beams 12, the evaluation target may be a fire-resistant coated structure in which low-emissivity paint 16 is applied to the surface of fire-resistant coating material 14 facing steel beams 12. Alternatively, the evaluation target may be a fire-resistant coated structure in which low-emissivity paint 16 is applied to the surface of fire-resistant coating material 14 facing steel beams 12 in addition to applying low-emissivity paint 16 to the surface of steel beams 12. In this case, the heat conduction analysis described above is performed for each fire-resistant coated structure to determine a temperature rise suppression effect evaluation formula corresponding to the above relational expression (2), and the temperature rise suppression effect is evaluated using this evaluation formula. This method also achieves the same effects as described above.

[0029] However, in any fire-resistant covering structure, the emissivity of the steel beam 12, fire-resistant covering material 14, and low-emissivity paint 16 shall be set so that the total emissivity of the surface of the fire-resistant covering material 14 of the fire-resistant covering structure facing the steel beam 12 and the surface of the steel beam 12 is 0.2 or less. The total emissivity is calculated by ε i Substituting the emissivity corresponding to the fire-resistant coating material 14 (if the low-emissivity coating material 16 is applied, the emissivity of the fire-resistant coating material 14 after application) into ε s The calculation can be performed by substituting the emissivity corresponding to the steel beam 12 (if the low-emissivity paint 16 is applied, the emissivity of the steel beam 12 after application) into the above.

[0030] (Evaluation device) Next, an embodiment of the apparatus for evaluating the temperature rise suppression effect of a fire-resistant covering structure according to the present invention will be described. As shown in Figure 2, the evaluation device 100 for the temperature rise suppression effect of a fire-resistant coated structure in this embodiment is a device that uses a computer to evaluate the temperature rise suppression effect of the low-emissivity paint 16 of the fire-resistant coated structure 10 on the steel beams 12, and is composed of an input means 30, a calculation means 32, an evaluation means 34, an output means 36, a memory means 38, and a control means 40 consisting of a computer that controls these means.

[0031] The input means 30 is a device for inputting the inner periphery length H of the fire-resistant covering material 14 to be evaluated. i and the cross-sectional area A of steel beam 12 s The set inner circumference length H i and cross-sectional area A s is stored in the storage means 38. The input means 30 can be configured using, for example, a keyboard, a mouse, a touch panel, or the like that can input data into a computer or the like.

[0032] The calculation means 32 calculates the set inner periphery length H i and cross-sectional area A s From this, the ratio (H i / A s ) and calculate the calculated ratio (H i / A s) into the above relational expression (2), the temperature rise reduction rate R of the steel beam 12 due to the application of the low-emission paint 16 is obtained. d The calculated temperature rise reduction rate R d is stored in the storage means 38. The calculation means 32 can be configured using, for example, a computer capable of arithmetic processing.

[0033] The evaluation means 34 evaluates the obtained temperature rise reduction rate R d The temperature rise suppression effect is evaluated based on the above. The detailed processing contents of the evaluation means 34 are the same as the processing contents of step S3 above, so a description thereof will be omitted. The evaluation means 34 can be configured using, for example, a computer capable of arithmetic processing.

[0034] The output means 36 visualizes and outputs the setting results from the input means 30, the calculation results from the calculation means 32, the evaluation results from the evaluation means 34, and the data stored in the storage means 38. The output means 36 can be configured using, for example, a display, a printer, a touch panel, or the like that can output data.

[0035] The storage means 38 stores output values ​​from the input means 30, the calculation means 32, the evaluation means 34, etc. The storage means 38 can be configured using, for example, a computer capable of arithmetic processing, an external memory, an external storage device, etc.

[0036] According to the above configuration, similar to the above evaluation method, it is possible to easily evaluate the temperature rise suppression effect when the low-emission paint 16 is applied. Therefore, it is possible to effectively apply the low-emission paint 16 to the fire-resistant coated structure 10.

[0037] As explained above, the method for evaluating the temperature rise suppression effect of a fire-resistant coated structure according to the present invention is a method for evaluating, using a computer, the temperature rise suppression effect of a fire-resistant coated structure comprising a steel beam, a fire-resistant coating material covering the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to at least one surface of the steel beam and the fire-resistant coating material, the method comprising: performing a heat conduction analysis of the fire-resistant coated structure; and determining the relationship between the temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint and the ratio of the inner periphery of the fire-resistant coating material to the cross-sectional area of ​​the steel beam. the step of obtaining the temperature rise suppression effect in advance from the relationship obtained in advance, the step of setting the inner perimeter length of the fire-resistant coating material and the cross-sectional area of ​​the steel beam in the fire-resistant coated structure to be evaluated, the step of applying the set inner perimeter length of the fire-resistant coating material and the cross-sectional area of ​​the steel beam to the relationship obtained in advance to determine the temperature rise reduction rate of the fire-resistant coated structure to be evaluated, and the step of evaluating the temperature rise suppression effect based on the determined temperature rise reduction rate, thereby making it possible to easily evaluate the temperature rise suppression effect when low-emissivity paint is applied to the surface of at least one of the steel beam and the fire-resistant coating material.

[0038] Furthermore, the device for evaluating the temperature rise suppression effect of a fire-resistant coated structure according to the present invention is an evaluation device that uses a computer to evaluate the temperature rise suppression effect of a fire-resistant coated structure that includes a steel beam, a fire-resistant coating material that coats the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to at least one surface of the steel beam and the fire-resistant coating material, and stores the relationship between the temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint and the ratio of the inner perimeter of the fire-resistant coating material to the cross-sectional area of ​​the steel beam, which is obtained by a heat conduction analysis of the fire-resistant coated structure. The system is equipped with a memory means, an input means for setting the inner perimeter of the fire-resistant coating material and the cross-sectional area of ​​the steel beam in the fire-resistant coated structure to be evaluated, a calculation means for applying the inner perimeter of the fire-resistant coating material and the cross-sectional area of ​​the steel beam set by the input means to the relationship stored in the memory means to determine the temperature rise reduction rate of the fire-resistant coated structure to be evaluated, and an evaluation means for evaluating the temperature rise reduction effect based on the determined temperature rise reduction rate, so that the temperature rise suppression effect when low-emissivity paint is applied to the surface of at least one of the steel beam and the fire-resistant coating material can be easily evaluated.

[0039] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The method and device for evaluating the temperature rise suppression effect of a fire-resistant covering structure according to this embodiment can contribute to the achievement of one of the 17 SDGs, for example, goal 11, "Make cities and towns inclusive and sustainable." [Industrial Applicability]

[0040] As described above, the method and device for evaluating the temperature rise suppression effect of a fire-resistant coating structure according to the present invention are useful for fire-resistant coating of steel beams, and are particularly suitable for easily evaluating the temperature rise suppression effect when low-emissivity paint is applied. [Explanation of symbols]

[0041] 10 Fire-resistant covering structure 12 Steel beams 14 Fireproof cladding 16 Low emissivity paint 20 Web 22 Upper flange 24 Lower flange 26 Flooring 28 Hollow layer 30 Input Methods 32 Calculation Method 34 Evaluation tools 36 Output Method 38 Memory means 40 Control Means 100 Evaluation device for the temperature rise suppression effect of fire-resistant coating structure

Claims

1. A method for evaluating, using a computer, the effect of a low-emissivity paint on a temperature rise suppression of a steel beam in a fire-resistant coating structure comprising a steel beam, a fire-resistant coating material covering the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to the surface of at least one of the steel beam and the fire-resistant coating material, the method comprising: a step of performing a heat conduction analysis on the fire-resistant coating structure and obtaining in advance a relationship between a temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint and a ratio of an inner periphery length of the fire-resistant coating material to a cross-sectional area of ​​the steel beam; A step of setting an inner perimeter length of the fire-resistant covering material and a cross-sectional area of ​​the steel beam in the fire-resistant covering structure to be evaluated; A step of applying the set inner perimeter length of the fire-resistant covering material and the cross-sectional area of ​​the steel beam to the previously acquired relationship to obtain the temperature rise reduction rate of the fire-resistant covering structure to be evaluated; and evaluating the temperature rise suppression effect based on the obtained temperature rise reduction rate.

2. An evaluation device for evaluating, using a computer, the effect of the low-emissivity paint on the temperature rise suppression of a steel beam in a fire-resistant coating structure including a steel beam, a fire-resistant coating material that coats the outside of the steel beam in a box-like manner, and a low-emissivity paint applied to the surface of at least one of the steel beam and the fire-resistant coating material, a storage means for storing the relationship between the temperature rise reduction rate of the steel beam due to the application of the low-emissivity paint, which is obtained by a heat conduction analysis of the fire-resistant coating structure, and the ratio of the inner periphery length of the fire-resistant coating material to the cross-sectional area of ​​the steel beam; an input means for setting the inner periphery length of the fire-resistant covering material and the cross-sectional area of ​​the steel beam in the fire-resistant covering structure to be evaluated; a calculation means for applying the inner periphery length of the fire-resistant covering material and the cross-sectional area of ​​the steel beam set by the input means to the relationship stored in the storage means, and calculating the temperature rise reduction rate of the fire-resistant covering structure to be evaluated; and an evaluation means for evaluating the temperature rise suppression effect based on the obtained temperature rise reduction rate.

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