Method and system for determining wind resistance bearing capacity of 270-degree occlusion connection metal roof

Abstract

The invention discloses a method for determining wind resistance bearing capacity of a 270-degree occlusion connection metal roof, which comprises the following steps of: establishing a 270-degree occlusion metal roof simulation model, calculating parameters of the simulation model, and performing grid division and solution condition setting on the simulation model; the wind damage resistance failure criterion of the 270-degree occlusion connection metal roof is defined, and the wind damage resistance failure criterion comprises the steps that when any one of the large lug edge bending position and the small lug edge bending position exceeds the wabbler edge of the support, it is considered that the roof panel is disengaged from the support; obtaining the wind-resistant bearing capacity of different metal roof simulation models under different simulation parameters during wind-resistant failure through simulation, so as to obtain the influence degree of different simulation parameters on the wind-resistant bearing capacity; determining a wind resistance bearing capacity determination formula of the 270-degree occlusion connection metal roof based on parameter fitting; and based on the model test and / or test data collection, verifying the accuracy of the wind resistance bearing capacity determination formula of the 270-degree occlusion connection metal roof. The invention also discloses a corresponding evaluation system and device, electronic equipment and a computer readable storage medium.

Description

Technical Field

[0001] The invention relates to the technical field of wind-resistant design of metal roofs, 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 bite-jointed metal roofs are widely used in building roof enclosure systems, providing shelter for users in buildings and keeping out wind and rain. The existing specifications clearly define the calculation methods for the bending and shear bearing capacity of metal roofs, but in actual use, many 270-degree bite-jointed metal roofs fail at the bite-joint locations, and the existing calculation methods lack relevant calculation content for the bite-joint locations. 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 view of the defects of the prior art. By defining the wind-resistant dislocation failure criterion of the 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: S1, establishing a 270-degree interlocking metal roof simulation model, calculating the parameters of the simulation model, and performing meshing and solution condition setting on the simulation model; 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; S3, obtaining the wind resistance bearing capacity of wind resistance failure under different simulation parameters for different metal roof simulation models through simulation, so as to obtain the influence degree 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; S5. Based on model tests and / or test data collection, verify the accuracy of the formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof.

[0005] Preferably, the parameters include material properties and contact attributes.

[0006] Preferably, the 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 measurement values; 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 the 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, such as Figure 2 shown.

[0007] S15, meshing the simulation model and setting the 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 roof wind load to the panel width of the roof panel set according to the grid width.

[0008] 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.

[0009] Preferably, the parameters of the roof panel model include elastic modulus, Poisson's ratio and yield strength.

[0010] Preferably, the wind resistance determination formula is formula (1): (1); Where: Indicates wind load, in 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.

[0011] 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.

[0012] The second aspect of the present invention is to provide a system for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, comprising: A 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; 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 blossom head, it is considered that the roof panel is detached from the support; A wind failure bearing capacity simulation module (103) is used to obtain the wind resistance bearing capacity of wind failure under different simulation parameters for different metal roof simulation models through simulation, 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; A wind resistance bearing capacity determination module (104), used to determine a wind resistance bearing capacity determination formula of the 270-degree bite-jointed 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.

[0013] 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.

[0014] 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 and execute the method described in the first aspect.

[0015] Beneficial effects of the method and system of the present invention: 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

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. 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 creative work.

[0017] Figure 1 A flow chart of a method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof provided according to an embodiment of the present invention; Figure 2 A schematic diagram of a contact attribute structure for setting the simulation model according to an embodiment of the present invention; Figure 3 A schematic diagram of a grid according to an embodiment of the present invention in which a roof wind load is added as a solution condition to the board width of the roof board set according to the grid width; Figure 4A schematic diagram of the principle of a ballastless track hidden defect detection system based on acoustic vibration according to an embodiment of the present invention; Figure 5 A schematic diagram of the wind damage resistance failure criteria of a 270-degree bite-jointed metal roof provided according to an embodiment of the present invention; Figure 6 The figure shows a dotted line graph of 40 sets of numerical analysis results plotted for the influence of roof panel width provided by an embodiment of the present invention; Figure 7 It is a schematic diagram of obtaining and comparing the bearing capacities obtained under different simulation parameters by using the same method according to an embodiment of the present invention; Figure 8 It is a schematic diagram showing the inclusion of numerical simulation results and calculation results of the proposed design formula together according to an embodiment of the present invention; Fig. 9 The figure shows a system structure diagram of a method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof provided in accordance with an embodiment of the present invention; Fig.10 A structural diagram of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0021] See also Figure 1 The first aspect of the present invention provides a method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, comprising: S1, establishing a 270-degree interlocking metal roof simulation model, calculating the parameters of the simulation model, and performing meshing and solution condition setting on the simulation model; As a preferred embodiment, the parameters include material properties and contact attributes.

[0022] As a preferred embodiment, the S1 includes: 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 measurement values; S13, establishing a plurality of different roof panel models corresponding to different widths and thicknesses of the roof panel, and determining parameters of the plurality of different roof panel models according to material properties of the roof panel and the support; wherein the parameters of the roof panel model include elastic modulus, Poisson's ratio and yield strength; 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.

[0023] S15, meshing the simulation model and setting the 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 the roof wind load to the width of the roof panel set according to the grid width, such as Figure 3 shown.

[0024] 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.

[0025] S3, obtaining the wind resistance bearing capacity of wind failure under different simulation parameters for different metal roof simulation models through simulation, so as to obtain the influence degree 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 material); 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, that is, when the purlin spacing is reduced from 1500mm to 1000mm, the locking edge bearing capacity is only increased by 4% on average.

[0026] In order to intuitively show the influence of roof panel width, 40 sets of numerical analysis results are plotted as point-line graphs, such as Figure 6 As shown, according to Figure 6 It can be clearly seen from the information 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 changes in the width of the roof panel, and the use of a smaller width of the roof panel 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 roofing panel, and the edge-locking bearing capacity of 0.8mm color steel plate is greater than that of 1.0mm aluminum-magnesium-manganese roofing panel. Figure 6 It can be clearly seen that the edge-locking bearing capacity of 0.8mm color steel plate is equivalent to that of 1.2mm aluminum-magnesium-manganese roof panel, and it performs better when the width of the roof panel 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 roofing panel, and the edge-locking bearing capacity of 0.8mm color steel plate is greater than that of 1.0mm aluminum-magnesium-manganese roofing panel. Figure 6 It can be clearly seen that the edge-locking bearing capacity of 0.8mm color steel plate is equivalent to that of 1.2mm aluminum-magnesium-manganese roof panel, and it performs better when the width of the roof panel 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.

[0027] The same method is used to obtain and compare the bearing capacity diagrams obtained under different simulation parameters. Figure 7 shown.

[0028] S4, determining a formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof based on parameter fitting; In this embodiment, according to the above calculation example, the formula for determining the wind resistance bearing capacity is formula (1): (1); Where: Indicates wind load, in 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.

[0029] S5. Based on model tests and / or test data collection, verify the accuracy of the formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof.

[0030] 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 According to the data in, 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. Embodiment 2

[0031] like Fig. 9 As shown, this embodiment provides a system for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, comprising: 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; 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 blossom head, it is considered that the roof panel is detached from the support; The wind failure bearing capacity simulation module 103 is used to obtain the wind resistance bearing capacity of wind failure under different simulation parameters for different metal roof simulation models through simulation, so as to obtain 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; A wind resistance bearing capacity determination module 104, used to determine a wind resistance bearing capacity determination formula of the 270-degree bite-jointed metal roof based on parameter fitting; 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.

[0032] 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.

[0033] like Fig.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 a plurality of instructions, and the instructions can be loaded and executed by the processor so that the processor can execute the method as in the first embodiment.

[0034] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 the parameters of the simulation model, and performing meshing and solution condition setting on the simulation model; 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; S3, obtaining the wind resistance bearing capacity of wind resistance failure under different simulation parameters for different metal roof simulation models through simulation, so as to obtain the influence degree 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; S5. Based on model tests and / or test data collection, verify the accuracy of the formula for determining the wind bearing capacity of the 270-degree bite-jointed metal roof.

2. A 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. A method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 2, characterized in that: The S1 includes: 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 measurement values; 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 the supports; S14, setting contact properties for the simulation model, the contact properties include a contact relationship of hard contact and friction contact, and a constraint relationship of completely fixed constraints and no constraints, as shown in Figure 2; S15, meshing the simulation model and setting the 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 roof wind load to the panel width of the roof panel set according to the grid width.

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 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.

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

6. A method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 5, characterized in that: The formula for determining the wind resistance is formula (1): （1）； Where: Indicates wind load, in 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.

7. A method for determining the wind bearing capacity of a 270-degree bite-jointed metal roof according to claim 6, 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.

8. A system for determining the wind bearing capacity of a 270-degree bite-jointed metal roof, used to implement the method of any one of claims 1 to 7, characterized in that: include: A 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; 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 blossom head, it is considered that the roof panel is detached from the support; A wind failure bearing capacity simulation module (103) is used to obtain the wind resistance bearing capacity of wind failure under different simulation parameters for different metal roof simulation models through simulation, 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; A wind resistance bearing capacity determination module (104), used to determine a wind resistance bearing capacity determination formula of the 270-degree bite-jointed 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.

9. 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 used to read the instructions and execute the method according to any one of claims 1 to 7.

10. 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 7.

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