A method and system for determining the wind bearing capacity of a 270-degree interlocking metal roof

Abstract

The present invention discloses a method for determining the wind load-bearing capacity of a 270-degree interlocking metal roof. The method comprises: establishing a simulation model of a 270-degree interlocking metal roof, calculating parameters of the simulation model, and meshing the simulation model and setting solution conditions; defining a failure criterion for wind damage to the 270-degree interlocking metal roof, including: assuming that the roof panel is disconnected from the support when either the large ear bend or the small ear bend exceeds the edge of the support's plum blossom head; obtaining the wind load-bearing capacity at wind failure under different simulation parameters for different metal roof simulation models through simulation, thereby determining the degree of influence of different simulation parameters on the wind load-bearing capacity; determining a formula for determining the wind load-bearing capacity of the 270-degree interlocking metal roof based on parameter fitting; and verifying the accuracy of the formula for determining the wind load-bearing capacity of the 270-degree interlocking metal roof based on model testing and / or test data collection. A corresponding evaluation system, device, electronic device, and computer-readable storage medium are also disclosed.

Description

Technical Field

[0001] The present invention relates to the technical field of metal roof wind-resistant design, and in particular to a method and system for determining the wind-resistant bearing capacity of a 270-degree bite-connected metal roof. Background Art

[0002] 270-degree snap-joint metal roofs are widely used in building envelope systems, providing shelter and protection from wind and rain. Existing specifications clearly define methods for calculating the bending and shear strength of metal roofs. However, in practice, many 270-degree snap-joint metal roofs fail at the snap joints, and existing calculation methods lack relevant information for calculating these joints. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and system for determining the wind bearing capacity of a 270-degree interlocking metal roof in response to the defects of the prior art. By defining the wind-resistant dislocation failure criterion of a 270-degree interlocking metal roof, the main influencing parameters of the wind bearing capacity are clarified, thereby serving as a method for calculating and verifying the wind bearing capacity.

[0004] A first aspect of the present invention is to provide a method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, comprising:

[0005] S1, establishing a 270-degree interlocking metal roof simulation model, calculating parameters of the simulation model, and performing meshing and solution condition setting on the simulation model;

[0006] S2 defines the failure criteria for wind damage to 270-degree snap-jointed metal roofs, including: when either the large ear bend or the small ear bend exceeds the edge of the support plum head, the roof panel is considered to be detached from the support;

[0007] S3, obtaining the wind resistance bearing capacity of different metal roof simulation models at wind resistance failure under different simulation parameters through simulation, thereby obtaining the influence of different simulation parameters on the wind resistance bearing capacity;

[0008] S4, determining a formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on parameter fitting;

[0009] S5. Verify the accuracy of the formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on model tests and / or test data collection.

[0010] Preferably, the parameters include material properties and contact attributes.

[0011] Preferably, the S1 includes:

[0012] S11, determining actual roof panel and support measurements of the metal roof;

[0013] S12, determining the cross-sectional dimensions of the simulation model based on the actual roof panel and support measurements;

[0014] S13, establishing a plurality of different roof panel models corresponding to different widths and thicknesses of the roof panels, and determining parameters of the plurality of different roof panel models according to material properties of the roof panels and supports;

[0015] S14, setting contact properties for the simulation model, wherein the contact properties include a contact relationship of hard contact and friction contact, and a constraint relationship of completely fixed constraint and no constraint, such as Figure 2 shown.

[0016] S15, meshing the simulation model and setting a mesh width according to the width of the roof panel, wherein the meshing adopts one of a single-layer mesh and a multi-layer mesh;

[0017] S16, setting the solution conditions, including: adding roof wind load to the panel width of the roof panel set according to the grid width.

[0018] Preferably, the simulation parameters include support spacing, roof panel width, roof panel thickness and roof panel elastic modulus, and the roof panel elastic modulus corresponds to the roof panel material.

[0019] Preferably, the parameters of the roof panel model include elastic modulus, Poisson's ratio and yield strength.

[0020] Preferably, the wind resistance determination formula is formula (1):

[0021] (1);

[0022] Where: Indicates wind load, unit is Pa; Indicates the elastic modulus of the roof panel, in Pa; Indicates the width of the roof panel in m; Indicates the thickness of the roof panel, in m; Indicates the support spacing in m.

[0023] Preferably, the numerical simulation results are listed together with the calculation results of formula (1) and the ratio of the formula calculation results to the numerical simulation results is listed to verify the accuracy of the design formula.

[0024] A second aspect of the present invention is to provide a system for determining the wind bearing capacity of a 270-degree snap-jointed metal roof, comprising:

[0025] A model building and processing module (101) is used to build a 270-degree interlocking metal roof simulation model, calculate parameters of the simulation model, and perform meshing and solution condition setting on the simulation model;

[0026] The wind damage failure criterion definition module (102) is used to define the wind damage failure criterion of the 270-degree bite-jointed metal roof, including: when any of the large ear bend and the small ear bend exceeds the edge of the support plum head, the roof panel is considered to be detached from the support;

[0027] A wind failure bearing capacity simulation module (103) is used to obtain, through simulation, the wind resistance bearing capacity of different metal roof simulation models at wind failure under different simulation parameters, thereby obtaining the degree of influence of different simulation parameters on the wind resistance bearing capacity; wherein the simulation parameters include support spacing, roof panel width, roof panel thickness and roof panel elastic modulus;

[0028] A wind resistance bearing capacity determination module (104) is used to determine a wind resistance bearing capacity determination formula of the 270-degree bite-connected metal roof based on parameter fitting;

[0029] The wind resistance bearing capacity verification unit (105) is used to verify the accuracy of the wind resistance bearing capacity determination formula of the 270-degree bite-jointed metal roof based on model tests and / or test data collection.

[0030] A third aspect of the present invention provides an electronic device, comprising a processor and a memory, wherein the memory stores a plurality of instructions, and the processor is configured to read the instructions and execute the method described in the first aspect.

[0031] A fourth aspect of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a plurality of instructions, and the plurality of instructions can be read by a processor to execute the method described in the first aspect.

[0032] Beneficial effects of the method and system of the present invention:

[0033] By defining the wind-resistant dislocation failure criterion for 270-degree interlocking metal roofs, clarifying the main influencing parameters of wind bearing capacity, and proposing calculation and verification methods for wind bearing capacity, a quantitative and reliable calculation basis for wind bearing capacity is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 Flowchart of a method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a structure for setting contact properties for the simulation model according to an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of a grid in which a roof wind load is added as a solution condition to the width of the roof panel set according to the grid width according to an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the principle of a ballastless track void and hidden defect detection system based on acoustic vibration according to an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the wind damage resistance failure criteria for a 270-degree bite-jointed metal roof provided according to an embodiment of the present invention;

[0040] Figure 6 The figure shows a dotted line graph of 40 sets of numerical analysis results for the influence of roof panel width provided by an embodiment of the present invention;

[0041] Figure 7 Schematic diagram showing the bearing capacity obtained and compared under different simulation parameters using the same method according to an embodiment of the present invention;

[0042] Figure 8 FIG2 is a schematic diagram showing the inclusion of numerical simulation results and calculation results of the proposed design formula according to an embodiment of the present invention;

[0043] Figure 9 FIG2 is a system structure diagram of a method for determining the wind bearing capacity of a 270-degree interlocking metal roof provided in accordance with an embodiment of the present invention;

[0044] Figure 10 A structural diagram of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1

[0048] See also Figure 1 The first aspect of the present invention is to provide a method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, comprising:

[0049] S1, establishing a 270-degree interlocking metal roof simulation model, calculating parameters of the simulation model, and performing meshing and solution condition setting on the simulation model;

[0050] As a preferred embodiment, the parameters include material properties and contact attributes.

[0051] As a preferred embodiment, the S1 includes:

[0052] S11, determining actual roof panel and support measurements of the metal roof;

[0053] S12, determining the cross-sectional dimensions of the simulation model based on the actual roof panel and support measurements;

[0054] S13, establishing a plurality of different roof panel models corresponding to different widths and thicknesses of the roof panels, and determining parameters of the plurality of different roof panel models based on material properties of the roof panels and supports; wherein the parameters of the roof panel models include elastic modulus, Poisson's ratio, and yield strength;

[0055] S14, setting contact properties for the simulation model, wherein the contact properties include a contact relationship of hard contact and friction contact, and a constraint relationship of completely fixed constraint and no constraint, such as Figure 2 shown.

[0056] S15, meshing the simulation model and setting a mesh width according to the width of the roof panel, wherein the meshing adopts one of a single-layer mesh and a multi-layer mesh;

[0057] S16, setting the solution conditions, including: adding the roof wind load to the width of the roof panel set according to the grid width, such as Figure 3 shown.

[0058] S2, defines the wind damage failure criteria for 270-degree bite-jointed metal roofs, including: when any of the large ear bend and the small ear bend exceeds the edge of the support plum head, the roof panel is considered to be detached from the support, as shown in 4.

[0059] S3, obtaining the wind resistance bearing capacity of different metal roof simulation models under different simulation parameters when the wind resistance fails, thereby obtaining the influence of different simulation parameters on the wind resistance bearing capacity; wherein, the simulation parameters include support spacing, roof panel width, roof panel thickness and roof panel elastic modulus (corresponding to Figure 7 roofing materials);

[0060] For example: To determine the effect of support spacing on the bearing capacity of the lock edge, take the ratio of the bearing capacity of 1000mm support spacing to the bearing capacity of 1500mm support spacing and list them in Figure 5 As shown in Table 5, the average value of the ratio is 1.04, which means that when the purlin spacing is reduced from 1500mm to 1000mm, the locking edge bearing capacity is only increased by 4% on average.

[0061] In order to intuitively show the influence of roof panel width, 40 sets of numerical analysis results are plotted as point-line graphs, as shown in Figure 6 As shown, according to Figure 6 It is obvious from the information in that the edge-locking bearing capacity of the roof panel gradually increases as the width of the roof panel decreases, and according to the slope of the curve, it can be judged that the edge-locking bearing capacity of the roof panel does not simply increase linearly as the width of the roof panel decreases, and the growth rate also increases as the width of the roof panel decreases; and according to the trend of the curve, the edge-locking bearing capacity of the metal roof panel (especially the color steel plate) increases faster when the width is reduced from 400mm to 300mm. Therefore, the edge-locking bearing capacity of the roof panel is more sensitive to the change of the width of the roof panel, and the use of smaller width roof panels can give full play to its performance. Figure 6 According to the information in the article, the edge locking bearing capacity of 0.6mm color steel plate is greater than that of 0.9mm aluminum magnesium manganese roof panel, and the edge locking bearing capacity of 0.8mm color steel plate is greater than that of 1.0mm aluminum magnesium manganese roof panel. Figure 6It can be clearly seen that the edge-locking bearing capacity of 0.8mm color steel plate is comparable to that of 1.2mm aluminum-magnesium-manganese roof panel, and the performance is even better when the roof panel width is 300mm. Therefore, the roof panel material will have a greater impact on the edge-locking bearing capacity. When taking anti-corrosion measures, the color steel plate roof has a higher bearing capacity. Figure 6 According to the information in the article, the edge locking bearing capacity of 0.6mm color steel plate is greater than that of 0.9mm aluminum magnesium manganese roof panel, and the edge locking bearing capacity of 0.8mm color steel plate is greater than that of 1.0mm aluminum magnesium manganese roof panel. Figure 6 It is clear that the edge-locking bearing capacity of 0.8mm color-coated steel sheet is comparable to that of 1.2mm aluminum-magnesium-manganese roofing sheet, and the performance is even better when the roofing sheet width is 300mm. Therefore, the roofing material has a significant impact on the edge-locking bearing capacity. When corrosion protection measures are taken, color-coated steel sheet roofing has a higher bearing capacity.

[0062] The same method is used to obtain and compare the bearing capacity diagrams obtained under different simulation parameters. Figure 7 shown.

[0063] S4, determining a formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on parameter fitting;

[0064] In this embodiment, according to the above calculation example, the formula for determining the wind bearing capacity is formula (1):

[0065] (1);

[0066] Where: Indicates wind load, unit is Pa; Indicates the elastic modulus of the roof panel, in Pa; Indicates the width of the roof panel in m; Indicates the thickness of the roof panel, in m; Indicates the support spacing in m.

[0067] S5. Verify the accuracy of the formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on model tests and / or test data collection.

[0068] In this embodiment, the numerical simulation results are listed together with the calculation results of formula (1). Figure 8 The ratio of the calculated results to the numerical simulation results is listed to verify the accuracy of the design formula. Figure 8 The data in the figure show that the ratio of the calculation result of formula (1) to the numerical simulation result fluctuates between 0.94 and 1.08. Therefore, it is judged that the prediction result of the wind bearing capacity determination formula of the 270-degree bite connection metal roof is accurate. Example 2

[0069] like Figure 9 As shown, this embodiment provides a system for determining the wind bearing capacity of a 270-degree interlocking metal roof, comprising:

[0070] The model building and processing module 101 is used to build a 270-degree interlocking metal roof simulation model, calculate the parameters of the simulation model, and perform meshing and solution condition setting on the simulation model;

[0071] The wind damage failure criterion definition module 102 is used to define the wind damage failure criterion for the 270-degree bite-jointed metal roof, including: when any of the large ear bend and the small ear bend exceeds the edge of the support plum blossom head, the roof panel is considered to be detached from the support;

[0072] The wind failure bearing capacity simulation module 103 is used to obtain the wind resistance bearing capacity of different metal roof simulation models under different simulation parameters when the wind fails, thereby obtaining the degree of influence of different simulation parameters on the wind resistance bearing capacity; wherein the simulation parameters include support spacing, roof panel width, roof panel thickness, and roof panel elastic modulus;

[0073] A wind bearing capacity determination module 104 is configured to determine a wind bearing capacity determination formula of the 270-degree bite-jointed metal roof based on parameter fitting;

[0074] The wind resistance verification unit 105 is used to verify the accuracy of the wind resistance determination formula of the 270-degree bite-jointed metal roof based on model tests and / or test data collection.

[0075] The present invention also provides a memory storing a plurality of instructions, wherein the instructions are used to implement the method as in the first embodiment.

[0076] like Figure 10 As shown, the present invention also provides an electronic device, including a processor 301 and a memory 302 connected to the processor 301, the memory 302 stores multiple instructions, and the instructions can be loaded and executed by the processor to enable the processor to execute the method as in embodiment 1.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, characterized in that: include: S1, establishing a 270-degree interlocking metal roof simulation model, calculating parameters of the simulation model, and performing meshing and solution condition setting on the simulation model; Said S1 comprises: S11, determining actual roof panel and support measurements of the metal roof; S12, determining the cross-sectional dimensions of the simulation model based on the actual roof panel and support measurements; S13, establishing a plurality of different roof panel models corresponding to different widths and thicknesses of the roof panels, and determining parameters of the plurality of different roof panel models according to material properties of the roof panels and supports; S14, setting contact properties for the simulation model, wherein the contact properties include a contact relationship of hard contact and friction contact, and a constraint relationship of completely fixed constraint and no constraint; S15, meshing the simulation model and setting a mesh width according to the width of the roof panel, wherein the meshing adopts one of a single-layer mesh and a multi-layer mesh; S16, setting the solution conditions, including: adding a roof wind load to the width of the roof panel set according to the grid width; S2 defines the failure criteria for wind damage to 270-degree snap-jointed metal roofs, including: when either the large ear bend or the small ear bend exceeds the edge of the support plum head, the roof panel is considered to be detached from the support; S3, obtaining the wind resistance bearing capacity of different metal roof simulation models at wind resistance failure under different simulation parameters through simulation, thereby obtaining the influence of different simulation parameters on the wind resistance bearing capacity; S4, determining a formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on parameter fitting; the formula for determining the wind bearing capacity is formula (1): （1）； Where: Indicates wind load, unit is Pa; Indicates the elastic modulus of the roof panel, in Pa; Indicates the width of the roof panel in m; Indicates the thickness of the roof panel, in m; Indicates the support spacing, in m; S5. Verify the accuracy of the formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on model tests and / or test data collection.

2. The method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 1, characterized in that: The parameters include material properties and contact attributes.

3. The method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 2, characterized in that: The simulation parameters include support spacing, roof panel width, roof panel thickness and roof panel elastic modulus, and the roof panel elastic modulus corresponds to the roof panel material.

4. A method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 3, characterized in that: The parameters of the roof panel model include elastic modulus, Poisson's ratio and yield strength.

5. The method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 4, characterized in that: The numerical simulation results are listed together with the calculation results of formula (1) and the ratio of the formula calculation results to the numerical simulation results is listed to verify the accuracy of the design formula.

6. A system for determining the wind bearing capacity of a 270-degree interlocking metal roof, for implementing the method of any one of claims 1 to 5, characterized in that: include: A model building and processing module (101) is used to build a 270-degree interlocking metal roof simulation model, calculate parameters of the simulation model, and perform meshing and solution condition setting on the simulation model; The wind damage failure criterion definition module (102) is used to define the wind damage failure criterion of the 270-degree bite-jointed metal roof, including: when any of the large ear bend and the small ear bend exceeds the edge of the support plum head, the roof panel is considered to be detached from the support; A wind failure bearing capacity simulation module (103) is used to obtain, through simulation, the wind resistance bearing capacity of different metal roof simulation models at wind failure under different simulation parameters, thereby obtaining the degree of influence of different simulation parameters on the wind resistance bearing capacity; wherein the simulation parameters include support spacing, roof panel width, roof panel thickness and roof panel elastic modulus; A wind resistance bearing capacity determination module (104) is used to determine a wind resistance bearing capacity determination formula of the 270-degree bite-connected metal roof based on parameter fitting; The wind resistance bearing capacity verification unit (105) is used to verify the accuracy of the wind resistance bearing capacity determination formula of the 270-degree bite-jointed metal roof based on model tests and / or test data collection.

7. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores a plurality of instructions, and the processor is configured to read the instructions and execute the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a plurality of instructions, and the plurality of instructions can be read by a processor to execute the method according to any one of claims 1 to 5.

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