A concrete bridge weather resistance performance test system

Abstract

This invention relates to a weathering performance testing system for concrete bridges, used for testing full-size or large-scale test specimens. The system includes a climate simulation laboratory, a loading test system, and a control system. The loading test system includes a self-reaction support with an array of loading units mounted on it. The loading units are configured such that, during static load testing, one or more loading units apply a predetermined pressure to the test specimen; during dynamic load testing, multiple loading units apply a predetermined pressure to the test specimen sequentially according to a set time sequence. By controlling the multiple loading units arranged in the control array to apply loads sequentially, a dynamic load equivalent to vehicle movement is generated on the test specimen, achieving a movement effect in a closed environment. The equipment is simple and reliable.

Description

Technical Field

[0001] This invention relates to the field of civil engineering testing technology, and in particular to a weather resistance testing system for concrete bridges. Background Technology

[0002] The weather resistance of concrete bridges is directly related to their service life and operational safety. In actual service environments, bridge structures are not only exposed to complex environmental factors such as temperature changes, humidity cycles, freeze-thaw cycles, carbonation, chloride ion corrosion, and solar radiation for a long time, but also bear the continuous or cyclic action of macroscopic mechanical loads such as vehicle loads and wind loads.

[0003] Currently, testing equipment for concrete weather resistance includes freeze-thaw chambers, salt spray chambers, constant temperature and humidity chambers, and fatigue testing machines. On the one hand, these devices typically use small, standard-sized specimens, which cannot fully reflect the material heterogeneity and structural characteristics of actual bridge structures caused by factors such as size effects, reinforcement details, and casting processes. On the other hand, these devices can only apply static or simple dynamic loads to the specimens, resulting in test conditions that are significantly inconsistent with the actual stress state of bridges. This fails to reveal the accelerating effect of macroscopic stress on environmental erosion rates, leading to a serious disconnect between test conclusions and engineering practice.

[0004] Based on the above-mentioned technical problems, this application proposes a weathering performance testing system for concrete bridges. Summary of the Invention

[0005] The purpose of this invention is to provide a weathering performance testing system for concrete bridges to solve the technical problems mentioned in the background art. This purpose is achieved through the following technical solutions: A weathering performance testing system for concrete bridges is provided for testing the weathering resistance of test specimens, which are full-size or large-scale components of concrete bridges. The system includes a climate simulation chamber, a loading test system, and a control system. The climate simulation chamber includes a chamber housing and a climate simulation system connected to the chamber housing. Both the climate simulation system and the loading test system are connected to the control system. The climate simulation system is used to create a preset test environment within the chamber housing. The loading test system includes a self-reaction support mounted above the chamber housing. Several loading units are mounted in a linear array on the self-reaction support, and the loading ends of the loading units extend into the chamber housing and connect to the test specimen. The loading units are configured as follows: During static load testing, a single or multiple loading units apply a set pressure to the test specimen; During the dynamic load test, the loading units apply a set pressure to the test piece one by one according to a set time sequence. The load value applied by the i-th loading unit at time t is... for: In the formula, For peak load, T is the duration of action of a single loading unit, Δt is the time difference between actions of adjacent loading units, i is the loading unit number, and t is the time variable.

[0006] Furthermore, a support platform is provided at the bottom of the test chamber, and a partition is vertically provided on the outer periphery of the support platform. The partition and the support platform form an immersion pool with an opening at the top, and any of the partitions can be flipped outward along the bottom to a horizontal state.

[0007] Furthermore, the laboratory chamber is equipped with a slide rail, on which a gantry frame slides, and on which a lifting device is installed.

[0008] Furthermore, the test chamber is equipped with a partition door that divides the test chamber into a first chamber and a second chamber. Both the first chamber and the second chamber are connected to the climate simulation system and the loading test system.

[0009] Furthermore, the climate simulation system includes one or more of the following: temperature system, humidity system, freeze-thaw test system, periodic immersion system, salt spray system, rain system, gas environment system, and light simulation system.

[0010] Furthermore, the freeze-thaw test system includes a constant temperature water tank, which is connected to the immersion tank via a first circulation pump; the first circulation pump is connected to the control system.

[0011] Furthermore, the cyclic immersion system includes a storage tank, which is connected to the immersion pool via a second circulation pump; the second circulation pump is connected to the control system.

[0012] A method for testing the weather resistance performance of concrete bridges includes the following steps: Step S1. Prepare test specimens: Prepare full-size or large-scale test specimens according to the concrete bridge design drawings, and place the test specimens in the designated positions inside the test chamber; Step S2. Compile the test spectrum: Compile the test spectrum through the control system. The test spectrum includes the environmental spectrum and the load spectrum. Step S3. Synchronous Coupling Test: Perform weather resistance test on the test piece according to the preset environmental spectrum, and simultaneously perform load test on the test piece according to the preset load spectrum; Step S4. Evaluate the performance of the test specimen: Perform visual inspection and internal non-destructive testing on the test specimen, and establish the time history curve of the performance degradation of concrete bridge under the coupled environmental-load action.

[0013] Furthermore, the load spectrum includes a static load spectrum and a dynamic load spectrum, which are applied alternately to the test specimen during environmental spectrum operation.

[0014] The technical solutions provided in this application have at least the following technical effects or advantages: 1. By conducting controlled environmental tests on full-size or large-scale test specimens, the test results can directly reflect the comprehensive impact of size effects, reinforcement constraints, construction defects, and structural details on durability, fundamentally solving the problem of serious disconnect between the test results of small specimens and engineering practice; 2. By simulating environmental erosion of test specimens under actual stress conditions through climate simulation and loading test systems, the mechanism by which stress accelerates or affects the durability degradation process is realistically reflected, thus improving the accuracy of test results; 3. By dividing the test chamber into two chambers, the performance degradation differences of test pieces under the same conditions with and without load can be compared in the same environment; or the response of test pieces under the same load can be tested in different environments, which enriches the data dimensions and greatly improves the experimental efficiency and the scientific nature of the conclusions. 4. By setting up a flip-up partition, the partition flips to a horizontal state during the freezing stage, at which time the test piece is free from water interference and the temperature field is uniform; during the melting stage, the partition flips to a vertical state to form an immersion pool, and constant temperature water is injected to accelerate heat exchange and promote the migration of the corrosive medium to the deeper layers of the cracks. This more realistically simulates the immersion and erosion process of the component by snowmelt and accumulated water under natural conditions, improves the accuracy of the test results, and also facilitates the handling of the test piece. 5. By controlling multiple loading units set in an array to apply loads sequentially according to a time sequence, a dynamic load equivalent to vehicle movement is generated on the test piece, realizing the movement effect in a closed environment. The equipment is simple and reliable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the test system structure in an embodiment of this application; Figure 2 This is a schematic diagram of the laboratory enclosure structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the loading test system structure in an embodiment of this application.

[0017] Reference numerals: 1. Test chamber; 11. Double-leaf insulated door; 12. Support platform; 13. Partition; 131. Support plate; 14. Telescopic mechanism; 2. Loading test system; 21. Self-reactive support; 22. Loading unit; 23. Ball joint. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] Example 1

[0020] like Figure 1-3 The system shown is a weathering performance testing system for concrete bridges, used to test the weathering resistance of test specimens, which are full-size or large-scale components of concrete bridges. By conducting controlled environmental tests on full-size or large-scale test specimens, the test results can directly reflect the comprehensive impact of size effects, reinforcement constraints, construction defects, and structural details on durability, fundamentally solving the problem of a serious disconnect between the test results of small specimens and actual engineering conditions.

[0021] The testing system includes a climate simulation laboratory, a loading test system 2, and a control system. The climate simulation laboratory includes a laboratory chamber 1 and a climate simulation system connected to the laboratory chamber 1. The climate simulation system is connected to the control system, and the control system creates a preset test environment within the laboratory chamber 1 through the climate simulation system.

[0022] like Figure 1 , Figure 2 As shown, the test chamber 1 is a rectangular box with a double-opening insulated door 11 at one end. An observation window is provided on the double-opening insulated door 11 for easy observation of the test results. A support platform 12 is designed at the bottom of the test chamber 1. The support platform 12 is required to bear a load of 30 tons with a deformation of less than 0.1 mm. Four partitions 13 are vertically installed around the outer perimeter of the support platform 12, forming an immersion pool with an open top. The bottom edge of the partition 13 near the double-opening insulated door 11 is connected to the support platform 12 via a hinge. A waterproof gasket is provided at the connection between the partition 13 and the support platform 12, and a telescopic mechanism 14 connects the partition 13 to two adjacent partitions 13. When the telescopic mechanism 14 extends, the partition 13 can be flipped outwards along its bottom edge to a horizontal position, facilitating the transport of the test specimen into the test chamber 1. When the telescopic mechanism 14 retracts, the partition 13 can be flipped inward along the bottom edge to a vertical position, and together with the other three partitions 13, form a closed soaking pool.

[0023] By setting up a flip-up partition, the partition flips to a horizontal position during the freezing phase of the freeze-thaw cycle test, at which point the test piece is free from water interference and the temperature field is uniform. During the melting phase of the freeze-thaw cycle test, the partition flips to a vertical position to form an immersion pool, into which constant-temperature water is injected to accelerate heat exchange and promote the migration of corrosive media to the deeper layers of cracks. This more realistically simulates the immersion and erosion process of components by snowmelt and accumulated water under natural conditions, improving the accuracy of test results and facilitating the handling of test pieces.

[0024] like Figure 1 , Figure 2 As shown, a drainage ditch is provided at the double-opening insulated door 11 of the test chamber 1. When the partition 13 at the double-opening insulated door 11 is flipped outward, the residual water in the soaking tank flows into the drainage ditch to prevent water accumulation inside the test chamber 1. When the partition 13 at the double-opening insulated door 11 is in a horizontal state, the partition 13 overlaps the drainage ditch, facilitating the transport of test specimens into the test chamber 1. Several support plates 131 are fixed to the back of the partition 13, and the support plates 131 abut against the bottom of the drainage ditch, thereby providing support and reinforcement for the partition 13 and preventing deformation under stress.

[0025] The test chamber 1 is also equipped with slide rails. Two slide rails are symmetrically installed on both sides of the support platform 12. A gantry frame is slidably installed between the two slide rails. The gantry frame is equipped with a manual lifting device to facilitate the handling or flipping of the test specimens. The gantry frame and slide rails should be made of weathering steel and have a load-bearing capacity of 10 tons.

[0026] The test chamber 1 is designed with a partition door in the middle, dividing it into a first chamber and a second chamber. The first and second chambers can be opened together for overall testing, or they can be tested independently, meeting relevant requirements for airtightness, temperature and humidity insulation, etc. By dividing the test chamber into two chambers, the performance degradation differences of test pieces under the same conditions with and without load can be compared; or the response of test pieces under the same load can be tested in different environments, enriching the data dimensions and greatly improving experimental efficiency and the scientific rigor of the conclusions.

[0027] The climate simulation system includes one or more of the following: temperature system, humidity system, freeze-thaw test system, periodic infiltration system, salt spray system, rain system, gas environment system, and light simulation system. The structure and principles of the climate simulation system are existing technologies and will not be elaborated upon here. The parameters of each system are as follows: 1) Temperature system: Temperature range: -40℃ to 80℃; Effective constant temperature range: -40℃ to 80℃; Temperature fluctuation: ±0.5℃; Temperature deviation: ±0.5; Cooling rate: Approximately 2 hours from room temperature to -20℃, approximately 3 hours from -20℃ to -40℃; Heating rate: Approximately 1 hour from room temperature to 50℃, approximately 1 hour from 50℃ to 80℃, with an average heating rate of 1.0 to 3℃ / min throughout the process; Temperature field uniformity requires that, under constant temperature, the temperature difference between points inside the test chamber is ±1℃ for -20℃ to 50℃ and ±1.5℃ for -20℃ to -40℃, and the temperature difference between points inside the test chamber is less than ±2℃ during cooling or heating.

[0028] 2) Humidity system: Humidity range: 30~98%RH Uniformity: The humidity deviation at all points inside the test chamber should be less than ±5%RH under constant temperature and full load. The humidification system will automatically shut off when the temperature drops below 0°C.

[0029] 3) Freeze-thaw test system: Controllable temperature range: -40~80℃ Freezing temperature: -40 to -10℃ Dissolution temperature: 18~20℃ The laboratory chamber 1 is externally equipped with a constant temperature water tank. This tank is heated, corrosion-resistant, and equipped with a filtration system. The tank's volume is 1-1.5 times that of the immersion tank, and it circulates the solution between the tank and the immersion tank via a first circulation pump to meet the requirements of the slow freezing test method. The constant temperature water tank maintains a constant temperature range of 18-20℃. After the freeze-thaw cycle test, the tank automatically injects liquid at 18-20℃ into the immersion tank, causing the test specimen to thaw.

[0030] 4) Periodic immersion system: The laboratory chamber 1 is equipped with a liquid storage tank, which is connected to the immersion tank via a second circulation pump. The periodic immersion system can automatically set the target liquid level rise and fall in the immersion tank, adapting to temperatures from -40℃ to 80℃, with a liquid level rise and fall rate of 10cm / min.

[0031] 5) Salt spray system: The salt spray system has functions such as unlimited circulation, liquid level alarm, abnormal alarm, automatic proportioning, automatic proportioning calibration, and real-time concentration monitoring. It should ensure that parameters such as indoor sedimentation and particle size remain constant during the experiment.

[0032] Particle size: ≥5μm, or at least dry fog conditions with a maximum particle size of less than 50μm and an average particle size of less than 10μm; Solution concentration: 3–15 ± 0.5%; Salt spray deposition: 1–3 m / 80 cm²·h; Salt flow rate: 150~250L / h.

[0033] 6) Rain shower system: Spray coverage: Entire room; Water spray nozzle diameter: 1.2mm; Rainfall intensity: 1-5 mm / min; Rainfall pressure: 80KP2-375KP2; Water supply rate: ≥1000 l / h; Artificial rain direction: optional; Rain cycle control: can be controlled manually or automatically; the cycle period can be freely set and controlled; the rain time can be freely set and automatically controlled; Temperature range: -40℃ to 80℃; 7) Gas environment system: Gas concentration range: 0.03% to 25% by volume; Gas concentration fluctuation: ±5% of the target value; Gas concentration non-uniformity: ≤2% of the reading; and the concentration deviation at all points in the room should be ≤1%. Concentration sensor accuracy (at 25℃): ≤ ±2% of reading Temperature range: -40℃ to 80℃; 8) Lighting simulation system: UV lamp wavelength range: 280-400nm; Radiation intensity: 60 W / m 2 ; Center distance between the test piece and the lamp tube: 500-800mm; Irradiation nonuniformity: ≤±10%; Irradiation instability: ≤±5%; Irradiance meter accuracy: ≤±5%; Suitable temperature range: 0℃~80℃.

[0034] like Figure 1 , Figure 3 As shown, the loading test system 2 includes a self-reactive support 21 installed above the test chamber 1. The self-reactive support 21 is an all-steel frame structure. Several loading units 22 are arrayed on the lower end face of the self-reactive support 21. The loading end of the loading unit 22 extends into the test chamber 1 through a hole in the top of the test chamber 1 and connects with the test piece. The loading unit 22 is a hydraulic jack. An airtight heat-insulating sealing sleeve is installed between the loading unit 22 and the hole in the top of the test chamber 1 to prevent the exchange of cold / heat energy inside and outside the test chamber 1, thereby saving energy and ensuring environmental uniformity.

[0035] The loading end of the loading unit 22 is equipped with a ball joint 23, and the loading unit 22 is connected to the test piece through the ball joint 23. When the test piece undergoes bending or torsional deformation under environmental erosion, the ball joint 23 can automatically adjust the force transmission direction to always keep the load perpendicular to the loading surface, thus eliminating additional bending moment.

[0036] The loading units 22 are arranged in a straight line along the length of the test piece. The number of loading units 22 is ≥4, and can be expanded to 8-16 depending on the length of the test piece. The loading units 22 are configured as follows: During static load testing, one or more loading units 22 apply a set pressure to the test specimen to simulate the stress on a concrete bridge under dead or long-term load.

[0037] During the dynamic load test, multiple loading units 22 apply a set pressure to the test piece one by one according to a set time sequence, thereby simulating the dynamic stress when a vehicle passes over a bridge. The load value applied by the i-th loading unit at time t is... for: In the formula, For peak load, T is the duration of action of a single loading unit, Δt is the time difference between actions of adjacent loading units, i is the loading unit number, and t is the time variable.

[0038] Its control logic is as follows: Let the loading units 22 be the first loading unit, the second loading unit, ..., the Nth loading unit from left to right, where N is the number of loading units.

[0039] In the initial state, all loaded units are contracted, and the load is 0; The first loading unit applies a load with a preset waveform, which rises to the peak value and then falls to 0, with a duration of T. After a delay of Δt, the first loading unit applies a load with the same preset waveform, which rises to the peak value and then drops to 0 for a duration of T. ... After a delay of Δt, the Nth loading unit applies a load with the same preset waveform, which rises to the peak value and then drops to 0 for a duration of T. The loop repeats once all loaded units have completed their actions.

[0040] By adjusting Its size can simulate vehicles of different weights. The larger the value of T, the greater the simulated vehicle weight, and vice versa. Vehicle speed can be simulated by adjusting T and Δt; the larger T and Δt are, the lower the simulated vehicle speed, and vice versa.

[0041] Preferably, two or three sets of loading units with equal spacing can be synchronously controlled to apply pressure to the test piece at the same time to simulate the load changes of a two-axle or three-axle vehicle passing over a bridge, thereby further improving the authenticity of the test results.

[0042] By controlling multiple loading units set up in an array to apply loads sequentially according to a time sequence, a dynamic load equivalent to vehicle movement is generated on the test piece, realizing the movement effect in a closed environment. The equipment is simple and reliable.

[0043] Example 2

[0044] A method for testing the weather resistance performance of concrete bridges includes the following steps: Step S1. Prepare test specimens: Prepare full-size or large-scale test specimens according to the concrete bridge design drawings, and place the test specimens in the designated positions inside the test chamber; The cross-sectional dimensions, reinforcement ratio, protective layer thickness, and prestressing application method of the test specimen are all made according to the actual bridge engineering design drawings at a scale of 1:1 or 1:2 to 1:5. Strain sensors, temperature sensors, and corrosion potential sensors are pre-embedded inside the test specimen. The test specimen is then hoisted and placed in the designated position inside the test chamber. Step S2. Compile the test spectrum: Compile the test spectrum through the control system. The test spectrum includes the environmental spectrum and the load spectrum. The environmental spectrum includes temperature, humidity, freeze-thaw cycle, wet-dry cycle, salt spray, precipitation, gas environment, and illumination spectrum. The temperature spectrum includes test temperature, test time, and rate of temperature change. The humidity spectrum includes test humidity, test time, and rate of humidity change. The freeze-thaw cycle spectrum includes freezing temperature, freezing time, thawing temperature, thawing time, and number of freeze-thaw cycles. The wet-dry cycle spectrum includes drying time, immersion time, and wet-dry cycle period. The salt spray spectrum includes spray pressure, salt spray deposition, brine concentration, and spray time. The precipitation spectrum includes spray pressure, spray flow rate, and spray time. The gas environment spectrum includes gas type, gas concentration, and test time. The illumination spectrum includes light source type, illuminance, spectrum, irradiance, and illumination time.

[0045] The load spectrum includes static load spectrum and dynamic load spectrum. The static load spectrum includes the static load holding value and duration; the dynamic load spectrum includes the dynamic load amplitude, frequency, waveform and number of cycles.

[0046] Step S3. Synchronous Coupling Test: The test piece is subjected to weathering test according to the preset environmental spectrum, and the test piece is subjected to load test according to the preset load spectrum at the same time; during the operation of the environmental spectrum, the static load spectrum and dynamic load spectrum are alternately applied to the test piece.

[0047] The static load is used to simulate the dead load and long-term continuous load of the bridge, and its load value is maintained at 20% to 70% of the ultimate bearing capacity of the test specimen.

[0048] Dynamic loads are used to simulate the loading effect when vehicles pass over a bridge. The load wave shape adopts sine wave, triangular wave or measured bridge response spectrum, the load frequency is 0.1Hz to 10Hz, and the load amplitude is 10% to 60% of the ultimate bearing capacity of the test piece.

[0049] Step S4. Evaluate the performance of the test specimen: Perform visual inspection and internal non-destructive testing on the test specimen to obtain indicators such as chloride ion penetration depth, carbonation depth, and steel corrosion rate, and establish the performance degradation time history curve of concrete bridge under the coupled environmental and load effects.

[0050] By simulating environmental erosion of test specimens under actual stress conditions using climate simulation and loading test systems, the mechanism by which stress accelerates or affects the durability degradation process is accurately reflected, thus improving the accuracy of test results.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A weathering performance testing system for concrete bridges, used to conduct weathering performance tests on test specimens, wherein the test specimens are full-size or large-scale components of concrete bridges, characterized in that, The system includes a climate simulation laboratory, a loading test system, and a control system. The climate simulation laboratory comprises a laboratory enclosure and a climate simulation system connected to the laboratory enclosure. Both the climate simulation system and the loading test system are connected to the control system. The climate simulation system is used to create a preset test environment within the laboratory enclosure. The loading test system includes a self-reacting force support mounted above the laboratory enclosure. Several loading units are mounted in a linear array on the self-reacting force support. The loading ends of the loading units extend into the laboratory enclosure and connect to the test specimen. The loading units are configured as follows: During static load testing, one or more of the loading units apply a set pressure to the test piece; During the dynamic load test, the loading unit applies a set pressure to the test piece one by one according to a set time sequence. The load value applied by the i-th loading unit at time t is... for: In the formula, For peak load, T is the duration of action of a single loading unit, Δt is the time difference between actions of adjacent loading units, i is the loading unit number, and t is the time variable.

2. The weathering performance testing system for concrete bridges according to claim 1, characterized in that, The bottom of the test chamber is provided with a support platform, and a partition is vertically provided on the outer periphery of the support platform. The partition and the support platform form an immersion pool with an opening at the top. Any of the partitions can be flipped outward along the bottom to a horizontal state.

3. The weathering performance testing system for concrete bridges according to claim 1, characterized in that, The test chamber is equipped with a slide rail, on which a gantry frame is slidably mounted, and a lifting device is installed on the gantry frame.

4. The weathering performance testing system for concrete bridges according to claim 1, characterized in that, The test chamber is equipped with a partition door that divides the test chamber into a first chamber and a second chamber. Both the first chamber and the second chamber are connected to the climate simulation system and the loading test system.

5. The weathering performance testing system for concrete bridges according to claim 1, characterized in that, The climate simulation system includes one or more of the following: temperature system, humidity system, freeze-thaw test system, periodic immersion system, salt spray system, rain system, gas environment system, and light simulation system.

6. The weathering performance testing system for concrete bridges according to claim 5, characterized in that, The freeze-thaw test system includes a constant temperature water tank, which is connected to the immersion tank via a first circulation pump; the first circulation pump is connected to the control system.

7. The weathering performance testing system for concrete bridges according to claim 5, characterized in that, The periodic immersion system includes a storage tank, which is connected to the immersion pool via a second circulation pump; the second circulation pump is connected to the control system.

8. A method for testing the weather resistance performance of concrete bridges, characterized in that, Includes the following steps: Step S1. Prepare test specimens: Prepare full-size or large-scale test specimens according to the concrete bridge design drawings, and place the test specimens in the designated positions inside the test chamber; Step S2. Compile the test spectrum: Compile the test spectrum through the control system. The test spectrum includes the environmental spectrum and the load spectrum. Step S3. Synchronous Coupling Test: Perform weather resistance test on the test piece according to the preset environmental spectrum, and simultaneously perform load test on the test piece according to the preset load spectrum; Step S4. Evaluate the performance of the test specimen: Perform visual inspection and internal non-destructive testing on the test specimen, and establish the time history curve of the performance degradation of concrete bridge under the coupled environmental-load action.

9. A method for testing the weathering performance of concrete bridges according to claim 8, characterized in that, The load spectrum includes a static load spectrum and a dynamic load spectrum. During the environmental spectrum operation, the static load spectrum and the dynamic load spectrum are alternately applied to the test piece.

Images