阅读说明：本技术 防眩板及其强度分析风载荷加载方法 (Anti-dazzle plate and strength analysis wind load loading method thereof ) 是由 李晓亮 张鹏 高利强 李臻 李科科 于 2021-07-29 设计创作，主要内容包括：本发明涉及公路交通安全设施技术领域,具体涉及一种防眩板,包括防眩板主体和设置于防眩板主体底部的底座,所述底座水平设置,所述防眩板主体的底部固定在底座上；防眩板主体呈反S型,防眩板主体的下部依次加厚呈渐变线形；本发明还公开了上述防眩板的强度分析风载荷加载方法。本发明通过在呈反S型样条曲线的防眩板主体基础上进一步采用下部加厚设计的结构,提高了防眩板抗风能力,同时提高了防眩板与底座交界位置处的结构强度,降低了防眩板在强风作用下底部发生断裂的可能性。(The invention relates to the technical field of road traffic safety facilities, in particular to an anti-dazzle plate, which comprises an anti-dazzle plate main body and a base arranged at the bottom of the anti-dazzle plate main body, wherein the base is horizontally arranged, and the bottom of the anti-dazzle plate main body is fixed on the base; the main body of the anti-dazzle plate is in an inverse S shape, and the lower part of the main body of the anti-dazzle plate is thickened in sequence to be in a gradual change line shape; the invention also discloses a strength analysis wind load loading method of the anti-dazzle plate. According to the invention, the structure with the thickened lower part is further adopted on the basis of the anti-dazzle plate main body with the curve of the reverse S-shaped sample strip, so that the wind resistance of the anti-dazzle plate is improved, the structural strength of the junction position of the anti-dazzle plate and the base is improved, and the possibility of breakage of the lower part of the anti-dazzle plate under the action of strong wind is reduced.)

1. The anti-dazzle plate is characterized by comprising an anti-dazzle plate main body (1) and a base (2) arranged at the bottom of the anti-dazzle plate main body (1), wherein the base (2) is horizontally arranged, and the bottom of the anti-dazzle plate main body (1) is fixed on the base (2); the anti-dazzle plate main body (1) is of an inverse S shape, and the lower part of the anti-dazzle plate main body (1) is thickened in sequence to be of a gradually changing line shape.

2. The antiglare shield according to claim 1, wherein the base (2) is symmetrically provided with through holes at both sides of the antiglare shield body (1), screws are provided in the through holes, and the base (2) is fixed on the isolation belt by screws.

3. The dazzle prevention plate of claim 2, wherein the number of the penetration holes is four that are evenly distributed.

4. The dazzle prevention plate according to claim 1, wherein the dazzle prevention plate body (1) and the base (2) are a unitary structure.

5. The method for analyzing strength of a dazzle prevention plate according to any one of claims 1 to 4, wherein the method comprises the steps of:

the method comprises the following steps: the base (2) of the antiglare shield is fixed, and the side surface and the top surface are free from constraint;

step two: establishing a Rayleigh damping equation, wherein the Rayleigh damping equation is as follows:

；

wherein a is₀And a₁Two proportionality coefficients, { M } is a mass matrix, and { K } is a stiffness matrix;

step three: calculating the natural vibration frequency to obtain two vibration mode damping ratios beta, and substituting the damping ratios into a formula

To obtain a₀And a₁Wherein ω is_nIs a fundamental frequency;

step four: after Rayleigh damping is applied to the anti-dazzle plate, wind loads of two different angles of 45 degrees and 90 degrees are applied to the side face of the anti-dazzle plate, and the acting time of the wind loads is 5 s.

Technical Field

The invention relates to the technical field of road traffic safety facilities, in particular to an anti-dazzle plate and a strength analysis wind load loading method thereof.

Background

The anti-dazzle board is a common road facility on an isolation belt of an expressway, is used for blocking glare caused by lamps on opposite lanes and preventing hidden traffic troubles caused by the harmful effects of the lamps on the opposite lanes on drivers. Because the existing anti-dazzle plate is thin, the joint of the anti-dazzle plate and the mounting seat is very easy to break under the action of wind in practical use, the anti-dazzle effect of the anti-dazzle plate is influenced, and the hidden danger of accidents is increased.

The anti-dazzle plate is mainly divided into a steel anti-dazzle plate, a plastic anti-dazzle plate and a glass anti-dazzle plate in terms of material; the shapes of the anti-dazzle board are mainly divided into a common straight board, an imitated relief anti-dazzle board, a landscape anti-dazzle board and the like. Although the industry has achieved great performance in the aspects of design, production, application and the like of such products, for example, patent document No. cn201920060288.x discloses a road antiglare plate convenient for construction, there are problems to be solved in practical use of such products: the anti-wind ability of highway antiglare shield needs to be considered, and the antiglare shield is because of thin thickness, light in weight, highly higher, easily takes place bending deformation under the strong wind effect, and the serious person can break at the bottom, causes and prevents dazzling the effect poor, has increased the hidden danger that the accident took place.

Disclosure of Invention

The invention provides an anti-dazzle plate and a strength analysis wind load loading method thereof for solving the problems in the background art, so that the wind resistance of the anti-dazzle plate is improved, and the structural strength of the junction position of the anti-dazzle plate and a base is improved.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the anti-dazzle plate comprises an anti-dazzle plate main body and a base arranged at the bottom of the anti-dazzle plate main body, wherein the base is horizontally arranged, and the bottom of the anti-dazzle plate main body is fixed on the base; the main body of the anti-dazzle plate is of an inverse S shape, and the lower part of the main body of the anti-dazzle plate is thickened in sequence to be of a gradually changing line shape.

Furthermore, the base is positioned on two sides of the antiglare shield main body and symmetrically provided with through holes, screws penetrate through the through holes, and the base is fixed on the isolation belt through the screws.

Furthermore, the number of the through holes is four and is evenly distributed.

Further, the antiglare shield main body and the base are of an integrated structure.

The strength analysis wind load loading method of the anti-dazzle plate comprises the following steps:

the method comprises the following steps: the base of the antiglare shield is fixed, and the side surface and the top surface are free from constraint;

step two: establishing a Rayleigh damping equation, wherein the Rayleigh damping equation is as follows:

；

wherein a0 and a1 are two proportionality coefficients, { M } is a mass matrix, and { K } is a stiffness matrix;

step three: calculating the natural vibration frequency to obtain two vibration mode damping ratios beta, and substituting the damping ratios into a formula

Obtaining a0 and a1, wherein ω n is the fundamental frequency;

step four: after Rayleigh damping is applied to the anti-dazzle plate, wind loads of two different angles of 45 degrees and 90 degrees are applied to the side face of the anti-dazzle plate, and the acting time of the wind loads is 5 s.

Through the technical scheme, the invention has the beneficial effects that:

according to the invention, the structure with the thickened lower part is further adopted on the basis of the anti-dazzle plate main body with the curve of the reverse S-shaped sample strip, so that the wind resistance of the anti-dazzle plate is improved, the structural strength of the junction position of the anti-dazzle plate and the base is improved, the possibility of bottom fracture of the anti-dazzle plate under the action of strong wind is reduced, and the normal operation is ensured.

Drawings

FIG. 1 is a schematic view of the structure of an dazzle prevention plate in the embodiment of the present invention.

FIG. 2 is a schematic diagram showing three different sizes of the radius of a spline curve when the side surface of the antiglare plate body in the embodiment of the present invention is an inverted S-shaped spline curve.

FIG. 3 is a schematic diagram showing stress strain caused by a 45 DEG wind direction when the size of the side spline radius of the antiglare plate body in the embodiment of the present invention is 20 mm.

FIG. 4 is a schematic diagram showing the stress strain caused by the 90 deg. wind direction when the radius of the spline curve on the side surface of the antiglare plate body in the embodiment of the present invention is 20 mm.

FIG. 5 is a schematic diagram showing stress strain caused by a 45 DEG wind direction when the radius of the spline curve on the side surface of the dazzle prevention plate main body in the embodiment of the present invention is 40 mm.

FIG. 6 is a schematic diagram showing the stress strain caused by the 90 deg. wind direction when the radius of the spline curve on the side surface of the dazzle prevention plate main body in the embodiment of the present invention is 40 mm.

FIG. 7 is a schematic diagram showing stress strain caused by a 45 DEG wind direction when the radius of the spline curve on the side surface of the dazzle prevention plate main body in the embodiment of the present invention is 60 mm.

FIG. 8 is a schematic diagram showing the stress strain caused by the 90 deg. wind direction when the radius of the spline curve on the side surface of the dazzle prevention plate main body in the embodiment of the present invention is 60 mm.

FIG. 9 is a schematic view showing a gradient formed by thickening the lower part of the dazzle prevention plate body when the side surface of the dazzle prevention plate body is a reverse S-shaped spline curve according to the embodiment of the present invention.

FIG. 10 is a schematic view showing stress and strain caused by a 45 wind direction when the lower portion of the dazzle prevention plate body is thickened according to the embodiment of the present invention.

FIG. 11 is a schematic view showing stress and strain caused by a 90 wind direction when the lower portion of the dazzle prevention plate main body is thickened according to the embodiment of the present invention.

FIG. 12 is a stress diagram of the dazzle prevention plate body under various operating conditions in the embodiment of the present invention.

FIG. 13 is a displacement diagram in which the dazzle prevention plate main body in the embodiment of the present invention is loaded with a wind direction of 45.

FIG. 14 is a displacement diagram in which the dazzle prevention plate main body in the embodiment of the present invention is loaded with a 90 deg. wind direction.

The reference numbers in the drawings are as follows: 1 is an anti-dazzle board main body, and 2 is a base.

Detailed Description

The invention is further described with reference to the following figures and detailed description:

in the description of the present invention, it is to be understood that the terms "left", "right", "upper", "lower", "lateral", "vertical", etc. indicate orientations or positional relationships based on those shown in fig. 1 only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Examples

As shown in fig. 1, the antiglare shield comprises an antiglare shield body 1 and a base 2 arranged at the bottom of the antiglare shield body 1, wherein the base 2 is horizontally arranged, and the bottom of the antiglare shield body 1 is fixed on the base 2; the antiglare shield main part 1 is of an inverse S shape, and the lower part of the antiglare shield main part 1 is thickened in sequence to be of a gradual change line shape.

In this embodiment, the base 2 is symmetrically provided with through holes at two sides of the antiglare shield body 1, screws penetrate through the through holes, and the base 2 is fixed on the isolation strip through the screws.

In this embodiment, the number of the through holes is four.

In this embodiment, the antiglare shield body 1 and the base 2 are of an integral structure.

The invention also discloses a strength analysis wind load loading method of the anti-dazzle plate, which comprises the following steps:

the method comprises the following steps: the base 2 of the antiglare shield is fixed, and the side surface and the top surface are free from constraint;

step two: establishing a Rayleigh damping equation, wherein the Rayleigh damping equation is as follows:

；

wherein a0 and a1 are two proportionality coefficients, { M } is a mass matrix, and { K } is a stiffness matrix;

step three: calculating the natural vibration frequency to obtain two vibration mode damping ratios beta, and substituting the damping ratios into a formula

Obtaining a0 and a1, wherein ω n is the fundamental frequency;

step four: after Rayleigh damping is applied to the anti-dazzle plate, wind loads of two different angles of 45 degrees and 90 degrees are applied to the side face of the anti-dazzle plate, and the acting time of the wind loads is 5 s.

Specifically, as shown in fig. 2 to 11, the present invention utilizes a large-scale numerical simulation software abaqus to perform a parameter study on the wind resistance of the antiglare shield, and the positions of the maximum stress of the antiglare shield are all located at the junction of the upper structure and the base 2; under the same wind direction, along with the increase of the radius of the spline curve, the stress value at the junction position of the antiglare shield and the bottom plate is obviously reduced; the influence of 45-degree wind direction on the anti-dazzle plate is larger than 90-degree wind direction; as shown in fig. 12, when the radius of the spline curve is the same as 40mm, the stress generated when the lower portion of the antiglare plate is gradually thickened is larger than when no gradation is made.

As shown in FIGS. 13 and 14, the maximum displacement of the antiglare shield under wind load occurs at the top, but the displacement oscillation area is 200mm away from the bottom plate (1/4 spline curve), and the displacement oscillation condition is gradually reduced from the bottom to the top. Under the same wind direction, the displacement maximum oscillation condition occurs at 20mm, and the minimum condition is 40 mm. Under the condition that the 1/4 spline curve of antiglare shield lower part is gradually thickened, the biggest displacement of lower part board is shaken and is improved less compared with other situations, and the displacement of upper portion will be obviously more than the condition of not having the gradual change.

Please refer to fig. 7 and 8 again: in a 45-degree wind direction, along with the increase of the radius of the spline curve, the bottom oscillation condition is intensified, but the maximum displacement of the top end is reduced by 1-2 cm; at 90 DEG wind direction, the maximum displacement value of the anti-dazzle plate is reduced by about 4cm compared with the anti-dazzle plate currently used in the current district. Therefore, under the action of two wind directions, the maximum displacement of the top ends of the three anti-dazzle plates with spline curves of different radiuses is smaller than that of the original anti-dazzle plate, but the bottom ends of the three anti-dazzle plates are subjected to displacement oscillation, and the deformation of the anti-dazzle plate with the curve of the reverse S-shaped spline is kept constant within a range of 400-850 mm from the bottom end, so that the displacement of the anti-dazzle plate is different from that of the anti-dazzle plate in use.

Through the comparison, under the condition that the lower part of the anti-dazzle plate main body 1 is not thickened, the anti-dazzle plate with the curve of the reverse S-shaped sample strip can generate displacement oscillation within a range of 200mm from the bottom under the action of wind load, and the maximum deformation of the top is improved; stress concentration is generated at the junction position of the main body 1 and the base 2, and the weak position is easy to break; the antiglare shield main part 1 of lower part thickening can effectively improve the displacement and vibrate the phenomenon under the wind load effect, nevertheless plays the opposite effect to the reduction of the biggest displacement in top, has leaded to the increase of top deformation on the contrary.

In conclusion, the structure with the thickened lower part is further adopted on the basis of the anti-dazzle plate main body 1 with the curve of the reverse S-shaped sample strip, so that the wind resistance of the anti-dazzle plate is improved, the structural strength of the junction position of the anti-dazzle plate and the base 2 is improved, the possibility of bottom fracture of the anti-dazzle plate under the action of strong wind is reduced, and the normal operation is guaranteed.

The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.