CN116499957B - Experimental device for simulating bridge under combined action of wind and sunlight - Google Patents
Experimental device for simulating bridge under combined action of wind and sunlight Download PDFInfo
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Abstract
The experimental device for simulating the bridge under the combined action of wind and sunlight comprises a bridge model, a wind simulation unit, a sunlight simulation unit and a ground reflection structure; according to the invention, the influence of a solar temperature field on the bridge is simulated by arranging the sunlight simulation unit and the ground reflection structure, the influence data of temperature on the bridge is provided for a designer, the analysis of the existing temperature problem of bridge construction is facilitated, the wind speed is adjusted by different gears through the blower arranged at the side, and meanwhile, the wind direction angle can be adjusted, so that the static force effect and the dynamic effect of wind on the bridge under natural environment are simulated, the change of the wind pressure value of the bridge is reflected, the effect of wind force acting on different positions on the bridge is reflected, precious experimental data is provided for the designer when the bridge is designed, the engineering cost is reduced, the structure is simple, the manufacturing cost is low, and the applicability is good.
Description
Technical Field
The invention relates to the technical field of bridge experimental devices, in particular to an experimental device for simulating the combined action of wind and sunlight of a bridge.
Background
The bridge bears the temperature effect of complex time variation under the normal use state, and the temperature field of the bridge structure is not only related to a plurality of factors such as geographic position, ambient air temperature, weather phenomena of rain, snow, cold and tide, local wind field, solar radiation and shielding relation, but also influenced by the effects of radiation, convection, heat conduction and the like. In view of this, it is important to design a device capable of performing a simulation experiment in a laboratory in addition to performing a related experiment in the field.
The existing researches are mainly numerical methods for simulating the wind field and the temperature field of the bridge, or experimental devices which independently consider the wind field, but do not consider the combined action of the wind field and the temperature field on the bridge;
In the prior art scheme, as disclosed in China with the publication number 212363607U, an experimental device which can be used for conveniently installing a model, adjusting the wind deflection angle, has no damage to a wind tunnel and has small interference to a flow field is provided, and the action effect of the temperature field is not taken into consideration;
The Chinese patent closest to the application with publication number 105241773A considers the combined action of sunlight, wind and rainfall, but only emphasizes the control of the rainfall, and does not describe the regulation of sunlight and wind.
However, sun exposure and wind have a great influence on the bridge, and the bridge is directly irradiated by sunlight, ultraviolet rays and radiation of surrounding environment; the bridge cross section has different light receiving conditions, so that the temperature is different and the bridge cross section changes at any time. In addition, each part cannot freely stretch after being heated, so that temperature stress is caused; meanwhile, under the coupling action of wind and temperature, the bridge structure can generate different responses; the prior art does not carry out combined research on the effects of sunlight and wind, and the prior art cannot reasonably consider the combined effect of natural conditions and multiple factors, so that the experimental result has lower referential property;
Therefore, those skilled in the art are dedicated to develop an experimental device for simulating the combined action of wind and sunlight, and design a test device capable of realizing the actions of factors such as wind, temperature, radiation and the like of the bridge under natural conditions, and well simulate the change conditions of the factors under natural conditions so as to solve the defects in the prior art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to solve the technical problem that the existing technology cannot reasonably consider the common action of natural conditions and multiple factors, so that the experimental result has low referential property.
In order to achieve the aim, the invention provides an experimental device for simulating the combined action of wind and sunlight of a bridge, which comprises a bridge model, a wind simulation unit, a sunlight simulation unit and a ground reflection structure; the bridge model is installed in the sunlight simulation unit; the ground reflection structure is connected with the sunlight simulation unit; the wind simulation unit is positioned at the outer side part of the bridge model, the solar simulation unit and the ground reflection structure;
Further, the wind simulation unit includes a blower; the air blower is arranged towards the bridge model, the sunlight simulation unit and the ground reflection structure; the wind speed and the wind direction angle of the wind blower are adjustable, so that the static force action and the dynamic force action of wind on the bridge under the natural environment are simulated, the change of the wind pressure value of the bridge is reflected, and the action effect of wind power acting on different positions on the bridge is reflected;
further, the sunlight simulation unit comprises a sunlight simulation frame, a sunlight simulation lamp and a sunlight simulation pulley; the sunlight simulation lamp is arranged on the sunlight simulation frame through a sunlight simulation pulley;
Further, the solar simulation frame comprises a circular frame and an arc frame; the arc-shaped frame is arched and simulates a solar motion track; the two ends of the arc-shaped frame are connected to the circular frame through the track pulleys, and the arc-shaped frame can perform circular motion according to the movement of the track pulleys;
Further, the sunlight simulation lamp comprises multiple illumination intensities, and can simulate multiple direct temperatures to realize sunlight simulation;
Further, the sunlight simulation pulley comprises three small pulleys and a tripod; the tripod is a triangular prism-shaped frame, and three small pulleys are arranged on three side edges of the triangular prism-shaped frame; the two small pulleys are arranged on the outer side of the arc-shaped frame and are positioned on the same plane; the rest small pulley is positioned at the inner side of the arc-shaped frame, the arc-shaped frame passes through the middle positions of the three small pulleys and is perfectly attached to the small pulleys, the outer contour radian of the small pulleys is attached to the arc-shaped frame radian, the small pulleys can rotate and drive the whole body to slide on the rod, a part of straight rods extend at the top of the tripod arranged at the inner side, and a sunlight simulation lamp is arranged at the top of the tripod;
Further, the track pulley comprises three small pulleys and a tripod; the tripod is a triangular prism-shaped frame, and three small pulleys are arranged on three side edges of the triangular prism-shaped frame; the two small pulleys are arranged at the upper end of the circular frame and are positioned on the same plane, the rest small pulley is positioned at the lower end of the circular frame, the circular frame passes through the middle positions of the three small pulleys and is perfectly attached to the small pulleys, the small pulleys rotate and drive the whole body to slide on the rod, and the vertex positions of two triangular frames at the upper end of the circular frame are respectively extended to form two straight rods which are connected with the bottom end of the arc frame, so that the triangular frames and the arc frame are integrally formed;
Further, the ground reflecting structure comprises a plurality of layers of paved reflecting materials, wherein the reflecting materials are composed of a plurality of materials with different reflectivities and are used for simulating the surface roughness of natural soil;
further, the ground reflecting structure is connected with the sunlight system frame through a plurality of vertical supporting rods; the supporting rod is telescopic;
further, two ends of the bridge model are fixedly installed along any diameter position of the circular frame through installation fixing devices;
further, the installation fixture includes, but is not limited to, a string, wire, rope;
Furthermore, a heating device can be arranged beside the sunlight simulation lamp to perform sunlight temperature supplementary simulation;
furthermore, a humidifying and dehumidifying device can be arranged beside the bridge model to simulate the humidity of sunlight;
preferably, the blower power is less than 100W;
preferably, the circular frame and the arc-shaped frame are both of a circular rod-shaped structure;
Preferably, the sliding surface of the small pulley is of a concave structure, the concave structure is semicircular, and the circumference is the same as that of the circular frame and the circular frame;
In a specific embodiment of the present invention, the ground reflecting structure comprises a layer of reflecting material;
By adopting the scheme, the experimental device for simulating the bridge under the combined action of wind and sunlight has the following advantages:
(1) According to the experimental device for simulating the bridge under the combined action of wind and sunlight, provided by the invention, the influence of a solar temperature field on the bridge is simulated by arranging the sunlight simulation unit and the ground reflection structure, so that the influence data of temperature on the bridge is provided for a designer, and the analysis of the temperature problem of the bridge construction existing at present is facilitated;
(2) According to the experimental device for simulating the bridge under the combined action of wind and sunlight, the wind speed is adjusted by different gears through the blower arranged on the side, and meanwhile, the wind direction angle can be adjusted, so that the static force action and the dynamic action of wind on the bridge under the natural environment are simulated, the change of the wind pressure value of the bridge is reflected, the action effect of wind force acting on different positions on the bridge is reflected, precious experimental data are provided for a designer when the bridge is designed, and the engineering cost is reduced;
(3) The experimental device for simulating the bridge under the combined action of wind and sunlight has the advantages of simple structure, low manufacturing cost and good applicability;
In summary, the experimental device for simulating the bridge under the combined action of wind and sunlight disclosed by the invention simulates the influence of a solar temperature field on the bridge by arranging the sunlight simulation unit and the ground reflection structure, provides the influence data of temperature on the bridge for a designer, is beneficial to analyzing and solving the existing temperature problem of bridge construction, and adjusts the wind speed by different gears through the blower arranged on the side, and simultaneously can adjust the wind direction angle, thereby simulating the static action and the dynamic action of wind on the bridge under the natural environment, reflecting the change of the wind pressure value of the bridge, and providing precious experimental data for the designer when designing the bridge due to the wind force acting on different positions.
The conception, specific technical scheme, and technical effects produced by the present invention will be further described in conjunction with the specific embodiments below to fully understand the objects, features, and effects of the present invention.
Drawings
FIG. 1 is a schematic diagram of an experimental device for simulating the combined action of wind and sunlight of a bridge;
FIG. 2 is a schematic diagram of the front structure of a rail pulley of an experimental device for simulating the combined action of wind and sunlight of a bridge;
FIG. 3 is a schematic diagram of the side structure of a rail pulley of an experimental device for simulating the combined action of wind and sunlight of a bridge;
FIG. 4 is a schematic diagram showing the connection of the sunlight simulation lamp, the sunlight simulation pulley and the front structure of the arc-shaped frame of the experimental device for simulating the combined action of wind and sunlight of the bridge;
FIG. 5 is a schematic diagram showing the connection of the side structures of the sunlight simulation lamp, the sunlight simulation pulley and the arc-shaped frame of the experimental device for simulating the combined action of wind and sunlight of the bridge;
In the figure, 1, a blower; 2. a solar radiation analog lamp; 3. a sunlight simulation pulley; 4. a track pulley; 5. a circular frame; 6. a ground reflection structure; 7. an arc-shaped frame; 8. a bridge model; 9. a small pulley; 10. and a tripod.
Detailed Description
The following describes a number of preferred embodiments of the present invention to make its technical contents more clear and easy to understand. This invention may be embodied in many different forms of embodiments which are exemplary of the description and the scope of the invention is not limited to only the embodiments set forth herein.
As shown in fig. 1 to 5, an experimental device for simulating a bridge under the combined action of wind and sunlight comprises a bridge model 8, a wind simulation unit, a sunlight simulation unit and a ground reflection structure 6; the bridge model 8 is installed in the sunlight simulation unit; the ground reflection structure 6 is connected with a sunlight simulation unit; the wind simulation unit is positioned at the outer side parts of the bridge model 8, the solar simulation unit and the ground reflection structure 6;
The wind simulation unit comprises a blower 1; the blower 1 is arranged towards the bridge model 8, the sunlight simulation unit and the ground reflection structure 6; the wind speed and the wind direction angle of the wind blower 1 are adjustable, so that the static force action and the dynamic force action of wind on the bridge under the natural environment are simulated, the change of the wind pressure value of the bridge is reflected, and the action effect of wind power acting on different positions on the bridge is reflected;
The sunlight simulation unit comprises a sunlight simulation frame, a sunlight simulation lamp 2 and a sunlight simulation pulley 3; the sunlight simulation lamp 2 is arranged on the sunlight simulation frame through a sunlight simulation pulley 3;
The solar simulation frame comprises a circular frame 5 and an arc-shaped frame 7; the arc-shaped frame 7 is arched and simulates the movement track of the sun; the two ends of the arc-shaped frame 7 are connected to the circular frame 5 through the track pulleys 4, and the arc-shaped frame 7 can perform circular motion according to the movement of the track pulleys 4;
The sunlight simulation lamp 2 comprises various illumination intensities, can simulate various direct temperatures and realizes sunlight simulation;
The sunlight simulation pulley 3 comprises three small pulleys 9 and a tripod 10; the tripod 10 is a triangular prism-shaped frame, and three small pulleys 9 are arranged on three side edges of the triangular prism-shaped frame; the two small pulleys 9 are arranged on the outer side of the arc-shaped frame 7 and are positioned on the same plane; the rest small pulley 9 is positioned at the inner side of the arc-shaped frame 7, the arc-shaped frame 7 passes through the middle positions of the three small pulleys 9 and is perfectly attached to the small pulleys 9, the radian of the outer outline of each small pulley 9 is attached to the radian of the arc-shaped frame 7, the small pulleys 9 can rotate and drive the whole body to slide on a rod, a part of straight rods extend at the top point of a tripod 10 arranged at the inner side, and the sunshine simulation lamp 2 is arranged at the top;
The track pulley 4 comprises three small pulleys 9 and a tripod 10; the tripod 10 is a triangular prism-shaped frame, and three small pulleys 9 are arranged on three side edges of the triangular prism-shaped frame; the two small pulleys 9 are arranged at the upper end of the circular frame 5 and are positioned on the same plane, the rest small pulley 9 is positioned at the lower end of the circular frame 5, the circular frame 5 passes through the middle positions of the three small pulleys 9 and is perfectly attached to the small pulleys 9, the small pulleys 9 rotate and drive the whole body to slide on a rod, and the vertex positions of two triangular frames 10 at the upper end of the circular frame 5 are respectively extended to form two straight rods which are connected with the bottom end of the arc-shaped frame 7, so that the triangular frames 10 and the arc-shaped frame 7 are integrally formed;
the ground reflecting structure 6 comprises a layer of paved reflecting material which is composed of a plurality of materials with different reflectivities and is used for simulating the surface roughness of natural soil;
the ground reflecting structure 6 is connected with the sunlight system frame through a plurality of vertical supporting rods; the supporting rod is telescopic;
The two ends of the bridge model 8 are fixedly installed along any diameter position of the circular frame 5 through installation fixing devices;
the installation fixture includes, but is not limited to, a string, an iron wire, a rope;
The power of the blower 1 is lower than 100W;
the round frame 5 and the arc frame 7 are both of round bar-shaped structures;
the sliding surface of the small pulley 9 is of a concave structure, the concave structure is semicircular, and the circumference diameter is the same as that of the round frame 5 and the round frame 5;
embodiment 1, an experimental device for simulating a bridge under combined action of wind and sunlight
Simulating the intensity of solar radiation: the method comprises the steps that the track of the sun is determined through a circular frame and an arc frame, the sun altitude angle is simulated through a sunlight simulation pulley, namely, the natural phenomenon that the sun rises and falls in east and west in one day is simulated, a sunlight simulation lamp simulates the sun light intensity, the light intensity is adjusted to simulate the radiation intensity change caused by cloud layer shielding in actual conditions, and the small pulley slides to realize the up-and-down movement of a light source;
simulation of solar time angle: the sun time angle is adjusted by sliding the sun simulation pulley and the track pulley on the arc-shaped frame together with the circular frame and the arc-shaped frame in an experiment;
Simulation of surface roughness: by arranging different reflection materials, the ground reflection structure can simulate different surface roughness;
Simulating wind environment: the bridge model is fixed on the circular frame, and the change condition of the wind environment of the bridge model is tested by adjusting the wind power, the wind speed and the position of the blower in the experiment;
As can be seen from example 1, the experimental device for simulating the bridge under the combined action of wind and sunlight provided by the invention can simulate different wind and sunlight conditions and simulate the combination of multiple influencing factors so as to explore the construction problems of the bridge under the wind and sunlight conditions under various conditions;
To sum up, this patent technical scheme, through having set up sunshine analog unit and ground reflection structure, the influence of sun temperature field to the bridge has been simulated, provide the influence data of temperature to the bridge for the designer, help the analysis to solve the temperature problem of bridge construction that exists at present, through the air-blower that the side set up, adjust wind speed size with different gears, also can adjust wind direction angle simultaneously, thereby simulate out the static effect of wind to the bridge under the natural environment, dynamic effect, reflect the wind pressure value change of bridge simultaneously, the effect of wind-force to the bridge that acts on different positions provides valuable experimental data for the designer when designing the bridge, reduce engineering cost, moreover, the steam generator is simple in structure, low in manufacturing cost, and good applicability.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by a person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (4)
1. The experimental device for simulating the combined action of wind and sunlight of the bridge is characterized by comprising a bridge model (8), a wind simulation unit, a sunlight simulation unit and a ground reflection structure (6); the bridge model (8) is installed in the sunlight simulation unit; the ground reflection structure (6) is connected with the sunlight simulation unit; the wind simulation unit is positioned at the outer side parts of the bridge model (8), the sunlight simulation unit and the ground reflection structure (6);
The wind simulation unit comprises a blower (1); the air blower (1) is arranged towards the bridge model (8), the sunlight simulation unit and the ground reflection structure (6); the wind speed and the wind direction angle of the wind blower (1) are adjustable, so that the static force and the dynamic force of wind on the bridge under natural environment are simulated, the change of the wind pressure value of the bridge is reflected, and the effect of wind power on different positions on the bridge is reflected;
the sunlight simulation unit comprises a sunlight simulation frame, a sunlight simulation lamp (2) and a sunlight simulation pulley (3); the sunlight simulation lamp (2) is arranged on the sunlight simulation frame through a sunlight simulation pulley (3);
The solar simulation frame comprises a round frame (5) and an arc-shaped frame (7); the arc-shaped frame (7) is arched and simulates a solar motion track; two ends of the arc-shaped frame (7) are connected to the circular frame (5) through the track pulleys (4), and the arc-shaped frame (7) can perform circular motion according to the movement of the track pulleys (4);
The sunlight simulation pulley (3) comprises three small pulleys (9) and a tripod (10); the tripod (10) is a triangular prism-shaped frame, and three small pulleys (9) are arranged on three side edges of the triangular prism-shaped frame; wherein, the two small pulleys (9) are arranged at the outer side of the arc-shaped frame (7) and are positioned on the same plane; the rest small pulley (9) is positioned at the inner side of the arc-shaped frame (7), the arc-shaped frame (7) passes through the middle positions of the three small pulleys (9) and is perfectly attached to the small pulleys (9), the radian of the outer outline of each small pulley (9) is attached to the radian of the arc-shaped frame (7), the small pulleys (9) can rotate and drive the whole body to slide on a rod, a part of straight rods extend at the top of a tripod (10) arranged at the inner side, and a sunlight simulation lamp (2) is arranged at the top;
The track pulley (4) comprises three small pulleys (9) and a tripod (10); the tripod (10) is a triangular prism-shaped frame, and three small pulleys (9) are arranged on three side edges of the triangular prism-shaped frame; the two small pulleys (9) are arranged at the upper end of the circular frame (5) and are positioned on the same plane, the rest small pulley (9) is positioned at the lower end of the circular frame (5), the circular frame (5) passes through the middle positions of the three small pulleys (9) and is perfectly attached to the small pulleys (9), the small pulleys (9) rotate and drive the whole body to slide on a rod, and the vertex positions of two triangular frames (10) at the upper end of the circular frame (5) are respectively extended to be connected with the bottom ends of the arc-shaped frames (7) by two straight rods, so that the triangular frames (10) and the arc-shaped frames (7) are integrally formed;
the ground reflection structure (6) comprises a plurality of layers of paved reflection materials, wherein the reflection materials are composed of a plurality of materials with different reflectivities and are used for simulating the surface roughness of natural soil;
The ground reflection structure (6) is connected with the circular frame (5) through a plurality of vertical support rods; the supporting rod is telescopic;
two ends of the bridge model (8) are fixedly arranged along any diameter position of the circular frame (5) through mounting and fixing devices;
A heating device is arranged beside the sunlight simulation lamp (2) to perform sunlight temperature supplementary simulation;
the sunlight simulation lamp (2) comprises various illumination intensities, can simulate various direct temperatures and realizes sunlight simulation;
the installation fixing device comprises a fine wire, an iron wire and a rope;
and a humidifying and dehumidifying device is arranged beside the bridge model (8) to simulate the humidity of sunlight.
2. Experimental device for simulating a bridge under combined action of wind and sunlight according to claim 1, characterized in that the blower (1) power is lower than 100W.
3. Experimental device for simulating a bridge under combined action of wind and sunlight according to claim 1, characterized in that the circular frame (5) and the arc-shaped frame (7) are both of a round bar-shaped structure.
4. The experimental device for simulating the combined action of wind and sunlight of a bridge according to claim 1, wherein the sliding surface of the small pulley (9) is of a concave structure, the concave structure is of a semicircular shape, and the circumference is the same as that of the circular frame (5).
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