Full-scale model and test method for solar temperature field of single-box multi-cell concrete box structure

Abstract

The application discloses a single-box multi-chamber concrete box structure sunshine temperature field full-scale model and a test method, and relates to the field of bridge engineering. The model comprises a bridge full-scale simplified model body, the bridge full-scale simplified model body is placed on a support pier capable of being lifted, and the posture of the bridge full-scale simplified model body is adjusted through the support pier; heat insulation plates are arranged at the cross sections of the model body; the bridge full-scale simplified model body is shortened according to the finite element simulation results of the bridge transverse equal-thickness segments and vertical equal-thickness segments, and when the temperature change of the arch bridge along the arch axis direction is less than a set value, the curvature is ignored when the arch bridge sunshine temperature field test is carried out, a straight segment with an inclination angle is used to replace the curved segment, and the inclination angle required by the bridge full-scale simplified model body for simulating the arch bridge segment is obtained; temperature sensors are embedded in the bridge full-scale simplified model body, and the temperature field change of the corresponding positions in the model is collected through the temperature sensors. The application can reduce the test cost on the basis of ensuring the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge temperature effect testing, and in particular to a full-scale model of a single-box multi-chamber concrete box structure sunlight temperature field and a testing method. Background Art

[0002] With the rapid development of bridge structures, the application of concrete box girder bridges has become more and more extensive. However, such structures are always in a natural environment with alternating temperatures. They exchange heat with the surrounding environment through thermal radiation, thermal convection and thermal conduction. Due to the poor thermal conductivity of concrete, the temperature distribution and temperature stress of such structures are very complex. [1] .

[0003] As the engineering community pays more and more attention to the harm of temperature stress to structures, bridge workers at home and abroad have begun to study it with various means, including real bridge monitoring, numerical simulation and experimental research.

[0004] Due to the difficulty and high cost of full-scale model testing, current experimental studies on bridge temperature fields mostly use scaled models. However, once a bridge is reduced in scale, the thickness of its cross-section will also decrease. If the temperature gradient is studied based on this, the results will be inaccurate. Therefore, one of the problems that need to be solved is how to reduce the scale of the model and reduce the difficulty and cost of the test while ensuring that the key cross-sectional dimensions remain unchanged. In addition, the existing research objects are mostly reinforced concrete box-beam bridges. For reinforced concrete box-arch bridges, due to the existence of the arch axis, the height of the arch rib cross-section varies along the longitudinal direction, and the solar radiation received by the top plate and web along the longitudinal direction also varies. However, whether the longitudinal dimension can be shortened, so how to shorten it is also a problem that needs to be solved.

[0005] References

[0006] [1] Yan Gang. Analysis of temperature field and temperature effect of long-span basket-type steel truss arch bridge[D]. Sichuan: Southwest Jiaotong University, 2019. Summary of the Invention

[0007] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a full-scale model and test method of the sunlight temperature field of a single-box multi-chamber concrete box structure, thereby simplifying the model structure and reducing the test cost while ensuring the accuracy of the test results.

[0008] In order to achieve the above object, the present invention has the following technical solutions:

[0009] In the first aspect, an embodiment of the present invention provides a full-scale model of the sunlight temperature field of a single-box multi-chamber concrete box structure, comprising a full-scale simplified model body of a bridge, wherein the full-scale simplified model body of the bridge is placed on a supporting pier that can be raised and lowered, and the posture of the full-scale simplified model body of the bridge is adjusted by the supporting pier; an insulation board for thermal isolation is provided at the cross section of the full-scale simplified model body of the bridge; the full-scale simplified model body of the bridge shortens the transverse equal-thickness section and the vertical equal-thickness section of the bridge according to the finite element simulation results, and according to the temperature change along the arch axis direction of the arch bridge, when it is less than a set value, the curvature is ignored when conducting the sunlight temperature field test of the arch bridge, and a straight section with an inclination angle is used instead of the curved section to obtain the inclination angle required for the full-scale simplified model body of the bridge to simulate the arch bridge segment; a temperature sensor is buried inside the full-scale simplified model body of the bridge, and the temperature field changes at the corresponding positions inside the model are collected by the temperature sensor.

[0010] As a preferred solution, the supporting pier includes a base, a hydraulic jack and a load-bearing support which are connected in sequence.

[0011] As a preferred solution, the load-bearing support and the full-scale simplified model body of the bridge are connected by plywood that can be thermally isolated.

[0012] As a preferred solution, when simulating box beam bridges and arch bridges, the full-scale simplified model of the bridge selects the most unfavorable sections under the action of the temperature field or other sections with special requirements for testing based on the bridge site and bridge direction.

[0013] As a preferred solution, the full-scale simplified model body of the bridge is shortened to 2 / 5 of the actual bridge transverse equal-thickness section based on the finite element simulation results.

[0014] As a preferred solution, the full-scale simplified model body of the bridge is shortened to 2 / 5 of the vertical equal-thickness section of the actual bridge based on the finite element simulation results.

[0015] As a preferred solution, according to the finite element simulation results, when the temperature variation of the arch bridge along the arch axis is less than 1%, the curvature is ignored during the sunlight temperature field test of the arch bridge, and a straight section with an inclined angle is used instead of the curved section.

[0016] As a preferred solution, the insulation board is covered with a blackout cloth and has holes in it. The insulation board can meet the thermal isolation requirements of the full-scale simplified model of the bridge along the span direction of the bridge, prevent light from entering the box cavity, and realize the exchange between the box and the outside atmosphere.

[0017] In a second aspect, an embodiment of the present invention further proposes a test method based on the full-scale model of the single-box multi-chamber concrete box structure sunlight temperature field, comprising the following steps:

[0018] The bridge full-size simplified model body is set for different types of box-type bridge structures:

[0019] When the real bridge of the sunshine temperature field test is a box-type beam bridge, and the model is required to be longitudinally and horizontally placed according to the actual working condition in the experiment, each supporting pier is synchronously activated, the lifting stroke of each supporting pier is controlled, and it is ensured that the model can be set according to the same posture as the real bridge, that is, the longitudinal posture of the model is consistent with the horizontal state of the real bridge;

[0020] When the real bridge of the sunshine temperature field test is a box-type arch bridge, firstly, the specific structure section of the arch bridge required to be simulated is determined, and the curvature information of the corresponding section is calculated according to the structure parameters of the actual arch bridge, when the temperature change of the arch bridge along the arch axis direction is less than a set value, the curvature is ignored and a straight section with an inclination angle is used to replace the curved section, and the inclination angle required by the bridge full-size simplified model body to simulate the arch bridge section is obtained; then, the lifting stroke of each supporting pier is controlled, so that the inclination angle of each section of the model in the simulation experiment state can reproduce the inclination condition of the corresponding section of the actual arch bridge.

[0021] The temperature field test is carried out through the set bridge full-size simplified model body, the temperature sensor buried in the inside of the bridge full-size simplified model body is used for real-time monitoring, and the temperature field change of the corresponding position in the model is obtained.

[0022] As a preferred scheme, if the daily temperature field is researched, the sampling frequency is 5 min / time; if the annual temperature field is researched, the sampling frequency is 10 min / time; after the temperature of different positions and different times of the box-type bridge structure is collected by the bridge full-size simplified model body, the data is screened, the error data is excluded, and the screened data is analyzed to obtain the temperature change rule.

[0023] Compared with the prior art, the present application has at least the following beneficial effects:

[0024] Due to its large volume, concrete box structures exhibit significant non-uniform temperature distribution after casting. The central region of the web exhibits a relatively low rate of temperature change due to its large thickness and the material's thermal conductivity. The response to changes in ambient temperature is primarily reflected in the top and bottom plates, which have larger surface areas. Considering that the top and bottom plates can be considered flat plate elements with sufficient area for effective heat exchange, under a reasonable heat conduction model, even if the horizontal and vertical dimensions of the top and bottom plates are moderately reduced, as long as sufficient heat transfer area is maintained to ensure effective heat dissipation, this change will not substantially affect the vertical temperature gradient distribution within the box girder. Similarly, following the above principles, the lateral temperature gradient of the web can also be maintained in equilibrium through similar thermodynamic analysis. The full-scale simplified model body of the bridge of the present invention shortens the transverse and vertical equal-thickness sections of the bridge according to the finite element simulation results, and according to the temperature change along the arch axis of the arch bridge, when it is less than a set value, the curvature is ignored when conducting the arch bridge sunlight temperature field test, and a straight section with an inclination angle is used instead of the curved section to obtain the inclination angle required for the full-scale simplified model body of the bridge to simulate the arch bridge segment. This not only solves the problems of inaccurate results of the scaled model and insufficient research on the arch bridge temperature field model test, but also greatly reduces the cost of the full-scale model. It is applicable to both ordinary box beam bridges and box arch bridges. The model proposed by the present invention can ensure that the temperature gradient at the location with larger temperature stress remains unchanged on the basis of reducing costs, and the test results are accurate, easy to operate, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings that constitute part of this application are used to provide a further understanding of the technical solution of this application. The schematic embodiments of this application and their descriptions are only used to explain this application and do not constitute an improper limitation on the scope of protection of this application.

[0026] Figure 1 This is a schematic structural diagram of a full-scale model of the sunlight temperature field of a single-box multi-chamber concrete box structure according to an embodiment of the present invention;

[0027] Figure 2 This is an exploded view of the overall structure of a full-scale model of the sunlight temperature field of a single-box multi-chamber concrete box structure according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the support pier structure according to an embodiment of the present invention;

[0029] Figure 4 A schematic cross-sectional view of a box girder bridge model according to an embodiment of the present invention;

[0030] Figure 5 This is a layout diagram of temperature sensors embedded inside a box girder bridge model body according to an embodiment of the present invention;

[0031] Figure 6This is a cloud diagram of the longitudinal temperature distribution of the arch bridge in Example 18 of the present invention (taking half the span L / 2);

[0032] Figure 7 This is a longitudinal temperature distribution curve diagram of a certain point on the cross section of an arch bridge in Example 18 of the present invention (taking half the span L / 2);

[0033] Figure 8 This is a temperature distribution cloud diagram of the box girder transverse section with constant thickness according to an embodiment of the present invention:

[0034] (a) No shortening; (b) Shortened by 0.75 m; (c) Shortened by 1.5 m; (d) Shortened by 2.25 m; (e) Shortened by 3 m;

[0035] Figure 9 This is a cloud diagram of the vertical temperature gradient of the box girder transverse section of equal thickness according to an embodiment of the present invention:

[0036] (a) No shortening; (b) Shortened by 0.75 m; (c) Shortened by 1.5 m; (d) Shortened by 2.25 m; (e) Shortened by 3 m;

[0037] Figure 10 This is a cloud diagram of the transverse temperature gradient of the box girder with constant transverse thickness according to an embodiment of the present invention:

[0038] (a) No shortening; (b) Shortened by 0.75 m; (c) Shortened by 1.5 m; (d) Shortened by 2.25 m; (e) Shortened by 3 m;

[0039] Figure 11 This is a comparison diagram of the temperature distribution of the top plate of the box beam after transverse shortening in an embodiment of the present invention;

[0040] Figure 12 This is a comparison diagram of the temperature distribution of the bottom plate of the box beam after transverse shortening in an embodiment of the present invention;

[0041] Figure 13 This is a comparison diagram of the temperature distribution of the web on the sun side after transverse shortening in an embodiment of the present invention;

[0042] Figure 14 This is a comparison diagram of the temperature distribution of the middle web after transverse shortening of an embodiment of the present invention;

[0043] Figure 15 This is a temperature distribution cloud diagram of the vertical thickness section of the box girder according to an embodiment of the present invention:

[0044] (a) No shortening; (b) Shortening by 0.5 m; (c) Shortening by 1 m; (d) Shortening by 1.5 m; (e) Shortening by 2 m;

[0045] Figure 16 This is a cloud diagram of the vertical temperature gradient of the box girder of the embodiment of the present invention:

[0046] (a) No shortening; (b) Shortening by 0.5 m; (c) Shortening by 1 m; (d) Shortening by 1.5 m; (e) Shortening by 2 m;

[0047] Figure 17 This is a cloud diagram of the transverse temperature gradient of the vertical constant thickness section of the box girder according to an embodiment of the present invention:

[0048] (a) No shortening; (b) Shortening by 0.5 m; (c) Shortening by 1 m; (d) Shortening by 1.5 m; (e) Shortening by 2 m;

[0049] Figure 18 This is a comparison diagram of the temperature distribution of the box beam top plate after vertical shortening in an embodiment of the present invention;

[0050] Figure 19 This is a comparison diagram of the temperature distribution of the bottom plate of the box beam after vertical shortening in an embodiment of the present invention;

[0051] Figure 20 This is a comparison diagram of the temperature distribution of the sun-facing web after vertical shortening in an embodiment of the present invention;

[0052] Figure 21 This is a comparison diagram of the temperature distribution of the middle web after vertical shortening in an embodiment of the present invention;

[0053] In the attached figure: 1- full-scale simplified model of the bridge; 2- supporting pier; 201- base; 202- hydraulic jack; 203- load-bearing support; 3- insulation board; 4- plywood. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0055] It should be noted that, in the description of the embodiments of the present invention, unless otherwise specified, “multiple” means two or more; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head”, “tail”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0056] Meanwhile, in the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] The concrete box structure has a large volume, and the temperature distribution in the interior thereof presents a significant non-uniform characteristic after pouring. The middle region of the web exhibits a relatively low temperature change rate due to the greater thickness and the influence of the material thermal conductivity, and the response to the change of the external environment temperature is mainly reflected in the top plate and the bottom plate with a large surface area. Considering that the top plate and the bottom plate can be regarded as flat plate elements with a large enough area for effective heat exchange, under a reasonable heat conduction model, even if the size of the top plate and the bottom plate in the transverse and longitudinal directions is moderately reduced, as long as the heat transfer area is kept enough to ensure the effective heat dissipation, this change will not substantially affect the temperature gradient distribution in the vertical direction inside the box girder. Similarly, following the above principle, the transverse temperature gradient of the web can also be maintained balanced through similar thermodynamic analysis.

[0058] However, it should be noted that the top plate, the bottom plate and the web are a synergistically working whole box girder system, and the heat transfer and temperature distribution therebetween are coupled with each other, and any adjustment of the size of a single component needs to fully consider the influence on the temperature field in the whole box girder structure and the accompanying thermal stress. Therefore, in actual application, although the size of each part can be reasonably optimized to reduce the test cost, it is necessary to ensure that the adjustment of the size will not excessively weaken the overall thermal stability and durability of the structure, so as to avoid inducing unacceptable temperature crack risk or other structural damage caused by temperature stress, and affecting the accuracy of the test result.

[0059] Therefore, the embodiment of the present application carries out temperature field finite element simulation on a single-box double-chamber arch bridge through ANSYS software. Since the highest temperature and the maximum vertical temperature difference of the single-box multi-chamber box girder are both at the key position, in addition to analyzing the longitudinal temperature distribution, the length (key size, key position) of the transverse top plate, the bottom plate and the vertical web is reduced respectively, and the temperature distribution near the key position of the top plate, the bottom plate and the web is analyzed. Based on the calculation result, a full-size model of the sunshine temperature field of the single-box multi-chamber concrete box structure and a test method are proposed, and through the present application, the cost of the full-size model can be greatly reduced, which can not only be applied to ordinary box girder bridges, but also be applied to box-type arch bridges, and has important economic value and application prospect.

[0060] Please refer to Figure 1 and Figure 2The full-scale model of the single-box multi-chamber concrete box structure sunlight temperature field of the embodiment of the present invention includes a full-scale simplified bridge model body 1. The full-scale simplified bridge model body 1 is placed on a lifting support pier 2. The support pier 2 can adjust the posture of the full-scale simplified bridge model body 1, such as Figure 3 As shown, the support pier 2 of this embodiment of the present invention includes a base 201, a hydraulic jack 202, and a load-bearing support 203, which are connected in sequence. The load-bearing support 203 is connected to the full-scale simplified bridge model body 1 by two layers of plywood 4 that provide thermal insulation. Insulation panels 3 for thermal insulation are installed on both sides of the cross-section of the full-scale simplified bridge model body 1. The insulation panels 3 are covered with blackout cloth and have holes in them. The insulation panels 3 can meet the thermal insulation requirements of the full-scale simplified bridge model body 1 along the span of the bridge, preventing light from entering the box cavity and enabling exchange between the box and the outside atmosphere. The full-scale simplified model body 1 of the bridge shortens the transverse and vertical equal-thickness sections of the bridge according to the results of the finite element simulation, and according to the temperature change along the arch axis of the arch bridge, when it is less than a set value, the curvature is ignored when conducting the arch bridge sunlight temperature field test, and a straight section with an inclination angle is used instead of the curved section to obtain the inclination angle required for the full-scale simplified model body 1 to simulate the arch bridge segment; a temperature sensor is embedded in the interior of the full-scale simplified model body 1 of the bridge, and the temperature field changes at the corresponding positions inside the model are collected through the temperature sensor. Since the full-scale simplified model body 1 of the bridge of the present invention is placed on the supporting pier 2, the model is prevented from contacting with the ground for heat exchange, and the actual load of ground reflected radiation can be simulated at the same time. In addition, the space provided by the supporting pier 2 allows air to flow freely to the lower surface of the bottom plate of the model body, which can simulate the actual convection load.

[0061] The hydraulic jack 202 of the embodiment of the present invention can accurately adjust the height of the supporting pier 2, thereby adjusting the angle of the full-scale simplified model body 1 of the bridge, and completing the solar temperature field test of different sections of the arch bridge.

[0062] The test of the embodiment of the present invention selects a site with a distance from the nearest building that is less than its blocking length and as close to the actual bridge position as possible to better simulate the real thermal load of the bridge and avoid the impact of the blocking of surrounding buildings on the constructed box girder.

[0063] When simulating box beam bridges and arch bridges, the full-scale simplified bridge model body 1 of the embodiment of the present invention selects the most unfavorable sections under the action of the temperature field or other sections with special requirements for testing according to the bridge site and bridge direction.

[0064] In a possible implementation, the full-scale simplified model body 1 of the bridge shortens the transverse equal-thickness section of the actual bridge to 2 / 5 according to the finite element simulation results, and shortens the vertical equal-thickness section of the actual bridge to 2 / 5 according to the finite element simulation results.

[0065] The bridge full-size simplified model body 1 according to the finite element simulation result, when the temperature change of the arch bridge along the arch axis direction is less than 1%, the curvature is ignored when the arch bridge solar temperature field test is carried out, and the straight section with the inclination angle is used instead of the curved section.

[0066] Please refer to Figures 4 to 21 According to the finite element simulation result, when the bridge transverse equal thickness section is shortened by 2.25m or less, the temperature change of each part of the box girder is less than 2‰, and when the section is shortened by 3m, the temperature of the top and bottom plates changes obviously, therefore, the length of the transverse equal thickness section of the model is set to 2 / 5 of the original length, so that the model manufacturing cost can be reduced as much as possible under the condition of ensuring the temperature effect unchanged.

[0067] On the other hand, according to the finite element simulation result, when the bridge vertical equal thickness section is shortened by 1.5m or less, the maximum temperature change of each part of the box girder is 3.5‰, and when the section is shortened by 2m, the temperature of the web changes obviously, therefore, the length of the vertical equal thickness section of the model is set to 2 / 5 of the original length, so that the model manufacturing cost can be reduced as much as possible under the condition of ensuring the temperature effect unchanged.

[0068] Before the test, first, the length of the transverse and vertical equal thickness section is shortened on the basis of the real bridge drawing, and the test model is manufactured. Figure 5 During the model pouring process, the sensor is buried according to the temperature sensor position shown in the drawing, the principle of "comprehensive arrangement, dense branch and yax, local adjustment" is followed, the measuring points are arranged at the structure surface layer, center and bottom layer, the measuring points are densely arranged at the branch and yax, and the measuring point position is flexibly adjusted according to the real bridge steel bar position. In addition, other types of sensors such as strain sensors can be arranged according to the research needs.

[0069] Another embodiment of the present application also provides a test method based on the single-box multi-chamber concrete box-type structure solar temperature field full-size model, which comprises the following steps:

[0070] For different types of box-type bridge structures, the bridge full-size simplified model body 1 is set as follows:

[0071] When the real bridge for the solar temperature field test is a box girder bridge, and the model is required to be placed in the longitudinal horizontal state according to the actual working condition in the experiment, the synchronous activation of each supporting pier 2 is realized, the lifting stroke of each supporting pier 2 is controlled, and it is ensured that the model can be set in the same posture as the real bridge, that is, the longitudinal posture of the model is consistent with the horizontal state of the real bridge;

[0072] When the actual bridge in the sunshine temperature field test is a box-type arch bridge, first, the specific structural segment of the arch bridge to be simulated is determined, and the curvature information of the corresponding segment is calculated based on the structural parameters of the actual arch bridge. When the temperature change along the arch axis of the arch bridge is less than the set value, the curvature is ignored and a straight segment with an inclined angle is used instead of the curved segment to obtain the inclination angle required for simulating the arch bridge segment of the full-scale simplified bridge model body 1. Then, by adjusting the lifting stroke of each supporting pier 2, the inclination angle of each segment of the model under the simulated experimental state can reproduce the inclination condition of the corresponding segment of the actual arch bridge.

[0073] A temperature field test is conducted on the set full-scale simplified model body 1 of the bridge, and real-time monitoring is performed using temperature sensors embedded inside the full-scale simplified model body 1 of the bridge to obtain temperature field changes at corresponding positions inside the model.

[0074] In one possible implementation, after the above-mentioned preparatory work is completed, a temperature field test can be conducted on the model segment, using a real-time monitoring scheme. If a daily temperature field study is conducted, the sampling frequency is 5 minutes per time; if an annual temperature field study is conducted, the sampling frequency is 10 minutes per time. After the test is completed, the model of the embodiment of the present invention is unloaded and the support pier 2 is recovered.

[0075] After collecting the temperatures at different positions and times of the box-type bridge structure using the full-scale simplified bridge model 1, the data is filtered to exclude erroneous data, and the filtered data is analyzed to obtain patterns such as vertical temperature gradients.

[0076] The embodiment of the present invention further reduces testing costs on the basis of a full-scale model by shortening the length of thick sections such as the box girder top plate and web. The model proposed in the embodiment of the present invention, while reducing costs, ensures that the temperature gradient remains constant in areas with high temperature stress, provides accurate results, is easy to operate, and has a wide range of applications. The embodiment of the present invention addresses the problems of difficulty and high cost in full-scale model testing, inaccurate results from scaled-scale models, and insufficient research on temperature field model testing for arch bridges.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations that come within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the scope of protection.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A full-scale model of the solar temperature field of a single-box multi-chamber concrete box structure, characterized by: The invention comprises a full-scale simplified model body (1) of a bridge, wherein the full-scale simplified model body (1) of the bridge is placed on a lifting support pier (2), and the posture of the full-scale simplified model body (1) of the bridge is adjusted by the support pier (2); An insulation board (3) for heat isolation is provided at the cross section of the full-scale simplified model body (1) of the bridge; the full-scale simplified model body (1) of the bridge shortens the transverse equal-thickness section and the vertical equal-thickness section of the bridge according to the finite element simulation results, and according to the temperature change along the arch axis direction of the arch bridge, when it is less than a set value, the curvature is ignored when performing the arch bridge sunshine temperature field test, and a straight section with an inclination angle is used instead of the curved section to obtain the inclination angle required for the full-scale simplified model body (1) to simulate the arch bridge segment; a temperature sensor is embedded in the interior of the full-scale simplified model body (1) of the bridge, and the temperature field change at the corresponding position inside the model is collected by the temperature sensor.

2. The full-scale model of the sunlight temperature field of a single-box multi-chamber concrete box structure according to claim 1 is characterized in that: The supporting pier (2) comprises a base (201), a hydraulic jack (202) and a load-bearing support (203) which are connected in sequence.

3. The full-scale model of the sunlight temperature field of a single-box multi-chamber concrete box structure according to claim 2 is characterized in that: The load-bearing support (203) is connected to the full-scale simplified model body (1) of the bridge via a plywood (4) capable of thermal insulation.

4. The full-scale model of sunlight temperature field of single-box multi-chamber concrete box structure according to claim 1 is characterized in that: When simulating a box beam bridge and an arch bridge, the full-scale simplified model body (1) of the bridge selects the most unfavorable section under the action of the temperature field or other sections with special requirements for testing according to the bridge site and the bridge direction.

5. The full-scale model of sunlight temperature field of single-box multi-chamber concrete box structure according to claim 1 is characterized in that: The full-scale simplified bridge model body (1) is shortened to 2 / 5 of the actual bridge transverse equal-thickness section based on finite element simulation results.

6. The full-scale model of sunlight temperature field of single-box multi-chamber concrete box structure according to claim 1 is characterized in that: The full-scale simplified model body (1) of the bridge is shortened to 2 / 5 of the vertical equal-thickness section of the actual bridge based on the finite element simulation results.

7. The full-scale model of sunlight temperature field of single-box multi-chamber concrete box structure according to claim 1 is characterized in that: According to the finite element simulation results, when the temperature variation of the arch bridge along the arch axis is less than 1%, the curvature is ignored during the arch bridge sunlight temperature field test, and a straight section with an inclined angle is used instead of a curved section.

8. The full-scale model of sunlight temperature field of single-box multi-chamber concrete box structure according to claim 1 is characterized in that: The insulation board (3) is covered with a shading cloth and has holes in it. The insulation board (3) can meet the requirements of thermal isolation of the full-scale simplified model body (1) of the bridge along the span direction of the bridge, prevent light from entering the box cavity, and realize the exchange between the box and the outside atmosphere.

9. A test method based on the full-scale model of the single-box multi-chamber concrete box structure sunlight temperature field according to any one of claims 1 to 8, characterized in that: The following steps are involved: For different types of box bridge structures, set up a full-scale simplified model of the bridge (1): When the actual bridge in the sunshine temperature field test is a box-type beam bridge, and the model is required to be placed longitudinally and horizontally according to the actual working conditions in the experiment, each supporting pier (2) is activated synchronously, and the lifting stroke of each supporting pier (2) is regulated to ensure that the model can be set in the same posture as the actual bridge, that is, the longitudinal posture of the model is consistent with the horizontal state of the actual bridge; When the actual bridge in the sunshine temperature field test is a box-type arch bridge, first, determine the specific structural segment of the arch bridge to be simulated, and calculate the curvature information of the corresponding segment based on the structural parameters of the actual arch bridge. When the temperature change along the arch axis of the arch bridge is less than the set value, ignore the curvature and use a straight segment with an inclination angle to replace the curved segment, and obtain the inclination angle required for the full-scale simplified model body (1) of the bridge to simulate the arch bridge segment; then, by adjusting the lifting stroke of each supporting pier (2), the inclination angle of each segment of the model under the simulated experimental state can reproduce the inclination condition of the corresponding segment of the actual arch bridge; A temperature field test is conducted on a set full-scale simplified model body (1) of the bridge, and a temperature sensor embedded inside the full-scale simplified model body (1) of the bridge is used for real-time monitoring to obtain temperature field changes at corresponding positions inside the model.

10. The test method according to claim 9, characterized in that If the daily temperature field study is conducted, the sampling frequency is 5 minutes per time; if the annual temperature field study is conducted, the sampling frequency is 10 minutes per time; After collecting the temperatures at different positions and times of the box-type bridge structure using the full-scale simplified model of the bridge (1), the data are filtered to exclude erroneous data, and the filtered data are analyzed to obtain the temperature variation pattern.

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