Anti-glare panels and wind load loading method for their strength analysis

Abstract

The present invention relates to the technical field of highway traffic safety facilities, and more specifically, to an anti-glare panel comprising an anti-glare panel body and a base disposed at the bottom of the panel body. The base is disposed horizontally, and the bottom of the panel body is fixed to the base. The anti-glare panel body is in an inverted S-shape, with the lower portion of the panel body progressively thickened in a gradient linear shape. The present invention also discloses a method for applying wind loads to the anti-glare panel for strength analysis. By further employing a structure with a thickened lower portion, based on the anti-glare panel body in the form of an inverted S-shaped spline curve, the present invention improves the wind resistance of the panel and enhances the structural strength at the junction of the panel and the base, thereby reducing the possibility of the panel's bottom portion breaking under strong winds.

Description

Technical Field

[0001] The present invention relates to the technical field of highway traffic safety facilities, and in particular to an anti-glare plate and a wind load loading method thereof for strength analysis. Background Art

[0002] Anti-glare panels are commonly used on highway medians, blocking glare from oncoming headlights and preventing them from adversely affecting drivers and potentially causing traffic hazards. Existing anti-glare panels are relatively thin, and are prone to breaking at the connection between the panel and mounting bracket due to constant wind loads. This compromises the panel's effectiveness and increases the risk of accidents.

[0003] Anti-glare panels are mainly divided into steel, plastic, and glass based on material; and are mainly divided into ordinary straight panels, imitation relief anti-glare panels, and landscape anti-glare panels based on shape. Although the industry has made great progress in the design, production, and application of such products, such as patent document CN201920060288.X, which discloses a road anti-glare panel that is easy to construct, such products also have important problems that need to be solved in actual use: anti-glare panels on highways need to consider wind resistance. Due to their thin thickness, light weight, and high height, anti-glare panels are prone to bending and deformation in strong winds. In severe cases, they can break at the bottom, resulting in poor anti-glare effect and increasing the risk of accidents. Summary of the Invention

[0004] In order to solve the problems mentioned in the background technology, the present invention proposes an anti-glare board and a wind load loading method for its strength analysis, which improves the wind resistance of the anti-glare board and at the same time improves the structural strength at the junction of the anti-glare board and the base.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] The anti-glare plate includes an anti-glare plate main body and a base arranged at the bottom of the anti-glare plate main body. The base is arranged horizontally, and the bottom of the anti-glare plate main body is fixed on the base; the anti-glare plate main body is in an inverted S shape, and the lower part of the anti-glare plate main body is thickened in sequence to form a gradient line shape.

[0007] Furthermore, the base is symmetrically provided with through holes on both sides of the anti-glare plate body, screws are passed through the through holes, and the base is fixed to the isolation belt by the screws.

[0008] Furthermore, the number of the through holes is four and they are evenly distributed.

[0009] Furthermore, the anti-glare plate body and the base are an integrated structure.

[0010] The wind load loading method for strength analysis of the anti-glare panel comprises the following steps:

[0011] Step 1: Fix the base of the anti-glare plate, leaving the side and top surfaces unconstrained;

[0012] Step 2: Establish the Rayleigh damping equation, which is:

[0013] ;

[0014] Among them, a0 and a1 are two proportional coefficients, {M} is the mass matrix, and {K} is the stiffness matrix;

[0015] Step 3: Calculate the natural frequency and obtain the damping ratio β of the two vibration modes. Substitute the damping ratio into the formula

[0016]

[0017] Then we can get a0 and a1, where ωn is the basic frequency;

[0018] Step 4: After applying Rayleigh damping to the anti-glare panel, apply wind loads at two different angles of 45° and 90° to its side, and the wind load action time is 5s.

[0019] Through the above technical solution, the beneficial effects of the present invention are:

[0020] The present invention improves the wind resistance of the anti-glare panel by further adopting a structure with a thickened lower part on the basis of the anti-glare panel main body in an inverted S-shaped spline curve. At the same time, it improves the structural strength at the junction of the anti-glare panel and the base, reduces the possibility of the bottom of the anti-glare panel breaking under strong winds, and ensures normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the anti-glare plate in an embodiment of the present invention.

[0022] Figure 2 Schematic diagrams of three different sizes of spline curve radius when the side surface of the anti-glare plate main body is an inverted S-shaped spline curve in an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of stress and strain generated by a 45° wind direction when the radius of the spline curve on the side of the anti-glare plate main body is 20 mm in an embodiment of the present invention.

[0024] Figure 4 Schematic diagram of stress and strain generated by a 90° wind direction when the radius of the spline curve on the side of the anti-glare plate main body is 20 mm in an embodiment of the present invention.

[0025] Figure 5It is a schematic diagram of stress and strain generated by a 45° wind direction when the radius of the spline curve on the side of the anti-glare plate main body is 40 mm in an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of stress and strain generated by a 90° wind direction when the radius of the spline curve on the side of the anti-glare plate main body is 40 mm in an embodiment of the present invention.

[0027] Figure 7 Schematic diagram of stress and strain generated by a 45° wind direction when the radius of the spline curve on the side of the anti-glare plate main body is 60 mm in an embodiment of the present invention.

[0028] Figure 8 Schematic diagram of stress and strain generated by a 90° wind direction when the radius of the spline curve on the side of the anti-glare plate main body is 60 mm in an embodiment of the present invention.

[0029] Figure 9 It is a schematic diagram of a gradient line formed by thickening the lower portion of the anti-glare plate main body when the side surface of the anti-glare plate main body is an inverted S-shaped spline curve in an embodiment of the present invention.

[0030] Figure 10 Schematic diagram of stress and strain generated by a 45° wind direction when the lower portion of the anti-glare plate main body is thickened in an embodiment of the present invention.

[0031] Figure 11 Schematic diagram of stress and strain generated by a 90° wind direction when the lower portion of the anti-glare plate main body is thickened in an embodiment of the present invention.

[0032] Figure 12 3 is a stress diagram of the anti-glare plate body under various working conditions in an embodiment of the present invention.

[0033] Figure 13 This is a displacement diagram of the anti-glare panel body in an embodiment of the present invention when loaded with a 45° wind direction.

[0034] Figure 14 This is a displacement diagram of the anti-glare plate body in an embodiment of the present invention when loaded with a 90° wind direction.

[0035] In the accompanying drawings, reference numerals 1 is the main body of the anti-glare plate, and 2 is the base. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0037] In the description of the present invention, it should be understood that the terms "left", "right", "up", "down", "horizontal", "vertical" and the like indicate directions or positional relationships based on the attached Figure 1The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention. Example

[0038] like Figure 1 As shown, the anti-glare plate includes an anti-glare plate main body 1 and a base 2 arranged at the bottom of the anti-glare plate main body 1. The base 2 is arranged horizontally, and the bottom of the anti-glare plate main body 1 is fixed on the base 2; the anti-glare plate main body 1 is in an inverted S shape, and the lower part of the anti-glare plate main body 1 is thickened in sequence to form a gradient line shape.

[0039] In this embodiment, the base 2 is symmetrically provided with through holes on both sides of the anti-glare plate body 1 , screws are passed through the through holes, and the base 2 is fixed to the isolation belt by the screws.

[0040] In this embodiment, the number of the through holes is four and they are evenly distributed.

[0041] In this embodiment, the anti-glare plate body 1 and the base 2 are an integrated structure.

[0042] The present invention also discloses a method for applying wind load to the anti-glare panel for strength analysis, comprising the following steps:

[0043] Step 1: Fix the base 2 of the anti-glare plate, leaving the side and top surfaces unconstrained;

[0044] Step 2: Establish the Rayleigh damping equation, which is:

[0045] ;

[0046] Among them, a0 and a1 are two proportional coefficients, {M} is the mass matrix, and {K} is the stiffness matrix;

[0047] Step 3: Calculate the natural frequency and obtain the damping ratio β of the two vibration modes. Substitute the damping ratio into the formula

[0048]

[0049] Then we can get a0 and a1, where ωn is the basic frequency;

[0050] Step 4: After applying Rayleigh damping to the anti-glare panel, apply wind loads at two different angles of 45° and 90° to its side, and the wind load action time is 5s.

[0051] Specifically, if Figures 2 to 11As shown in FIG, the present invention uses the large-scale numerical simulation software abaqus to conduct a parameter study on the wind resistance of the anti-glare plate. The maximum stress position of the anti-glare plate is located at the junction of the upper structure and the base 2. Under the same wind direction, as the radius of the spline curve increases, the stress value at the junction of the anti-glare plate and the base plate decreases significantly. The effect of the 45° wind direction on the anti-glare plate is greater than that of the 90° wind direction. Figure 12 As shown in the figure, when the radius of the spline curve is the same as 40 mm, the stress generated when the lower part of the anti-glare plate is gradually thickened is greater than that without gradual thickening.

[0052] like Figure 13 and 14 As shown in the figure, under wind load, the maximum displacement of the anti-glare panel occurs at the top, but the displacement oscillation area is 200mm from the bottom plate (1 / 4 spline curve), and the displacement oscillation gradually slows down from bottom to top. Under the same wind direction, the maximum displacement oscillation occurs at 20mm, and the minimum is 40mm. When the 1 / 4 spline curve of the lower part of the anti-glare panel is gradually thickened, the maximum displacement oscillation of the lower panel is less improved than in other conditions, while the upper displacement is significantly greater than when there is no gradual change.

[0053] Please refer again Figure 7 and Figure 8 At a 45° wind direction, as the spline curve radius increases, the oscillation at the bottom intensifies, but the maximum displacement at the top decreases by 1-2 cm. At a 90° wind direction, the maximum displacement of the anti-glare panel is approximately 4 cm less than that of the current anti-glare panel in use. Therefore, under both wind directions, the maximum displacement of the top of the anti-glare panel with the three different spline curve radii is smaller than that of the original anti-glare panel, but the displacement oscillates at the bottom. Furthermore, the anti-glare panel with the inverted S-shaped spline curve maintains a constant deformation within a range of 400-850 mm from the bottom, unlike the current anti-glare panel, which has a continuously increasing displacement.

[0054] Through the above comparison, when the lower part of the anti-glare panel main body 1 is not thickened, the anti-glare panel with an inverted S-shaped spline curve will have displacement oscillation within 200mm from the bottom under the action of wind load, which improves the maximum deformation of the top; the anti-glare panel main body 1 produces stress concentration at the junction with the base 2, which is a weak position of the anti-glare panel and is very prone to fracture; the anti-glare panel main body 1 with a thickened lower part can effectively improve the displacement oscillation phenomenon under the action of wind load, but has the opposite effect on reducing the maximum displacement of the top, which instead leads to an increase in the deformation of the top.

[0055] In summary, the present invention improves the wind resistance of the anti-glare board by further adopting a structure with a thickened lower part on the basis of the anti-glare board main body 1 which is an inverted S-shaped spline curve, and at the same time improves the structural strength at the junction of the anti-glare board and the base 2, thereby reducing the possibility of the bottom of the anti-glare board breaking under strong winds and ensuring normal operation.

[0056] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. Anti-glare plate, characterized in that: The invention comprises an anti-glare plate body (1) and a base (2) arranged at the bottom of the anti-glare plate body (1), wherein the base (2) is arranged horizontally, and the bottom of the anti-glare plate body (1) is fixed on the base (2); the side projection of the anti-glare plate body (1) is in an inverted S shape, and the lower part of the anti-glare plate body (1) is thickened from top to bottom in a gradient linear shape.

2. The anti-glare plate according to claim 1, characterized in that: The base (2) is symmetrically provided with through holes on both sides of the anti-glare plate main body (1), screws are passed through the through holes, and the base (2) is fixed to the isolation belt by the screws.

3. The anti-glare plate according to claim 2, characterized in that: The number of the through holes is four and is evenly distributed.

4. The anti-glare plate according to claim 1, characterized in that: The anti-glare plate main body (1) and the base (2) are an integrated structure.

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