Bridge and pavement wheel load fatigue test system and test method thereof

Abstract

The application discloses a bridge and pavement wheel load fatigue test system and a test method thereof. A counterforce frame system provides a space required for test; an actuator is installed on the counterforce frame system and located above a test piece to provide a load required for test; a force sensor is used for collecting the size of the load of the actuator to provide feedback for a control system; the control system is used for adjusting the size of the load of the actuator and controlling the loading value of the actuator; spring clamp arms are installed below the actuator and hinged to a wheel load simulation device to push the rollers of the wheel load simulation device to horizontally roll and provide wheel pressure load for the test piece; the wheel load simulation device has at least one group of rollers and acts on the test piece; and a loading table is used for fixing and placing the test piece. The application realizes bidirectional loading of single wheel and multiple wheels, expands the vehicle load type and wheel load application mode, improves the simulation level of vehicle-induced fatigue test of the bridge and pavement, and improves the test efficiency and precision.

Description

Technical Field

[0001] This invention relates to the field of civil engineering testing equipment, and in particular to a fatigue testing system for wheel loads on bridges and pavements and its testing method. Background Technology

[0002] Highway transportation is a vital link connecting cities, playing a crucial role in ensuring socio-economic development and serving as a lifeline project. With the increasing number of vehicles and traffic volume in my country, the load on bridges and roads is constantly increasing. Due to vehicle loads, the accumulation of damage and performance degradation of bridges and roads is widespread in my country, seriously threatening highway traffic safety and incurring high maintenance costs. Therefore, the study of fatigue performance of bridges and roads under vehicle loads has become one of the focal issues in the field of engineering structure durability research.

[0003] Fatigue testing remains the primary method for studying the fatigue performance of engineering structures, and the simulation of vehicle loads in fatigue test research is crucial to determining the accuracy of the test. Parameters such as vehicle type, axle type, number of axles, wheelbase, and axle load all affect the vehicle load, making the development of accurate and efficient wheeled load fatigue testing systems for bridges and pavements imperative. In recent years, some scholars have conducted related research. Liu Gao et al. invented a wheeled rolling fatigue loading test platform for bridge deck structures, realizing fatigue loading tests on specimens (application publication number CN104568616A). However, this test platform has a complex structure, requiring the simultaneous setting of a walking guidance system and a vertical loading system to control the horizontal movement and vertical pressure of the loading unit respectively. Zhang Guanhua et al. invented a wheeled load bridge and pavement fatigue testing system capable of conducting full-scale bridge and pavement fatigue tests (application publication number CN106525619A), but because the wheel pressure load in this test system is applied by the same vertical electro-hydraulic servo actuator, it is impossible to simulate differentiated wheel pressure.

[0004] In summary, there are currently no reports of bridge and pavement fatigue testing systems capable of simulating various wheel loads, which cannot fully meet the needs of durability research in my country's highway engineering, especially the urgent need for research on the fatigue performance of bridges and roads under long-term service conditions. This invention aims to disclose a wheel load bridge and pavement fatigue testing system that can meet the needs of multiple load modes, providing technical support for fatigue performance research in highway engineering. Summary of the Invention

[0005] This invention provides a simple and feasible fatigue testing system and method for bridges and pavements under wheeled loads. This system can be used to simulate various wheeled loads, improving the level of fatigue testing research on bridges and pavements.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fatigue testing system for wheel loads on bridges and pavements, the device comprising a reaction frame system, actuators, force sensors, spring clamps, a wheel load simulation device, a control system, a specimen, and a loading platform;

[0008] The reaction frame system provides the space required to conduct the experiment;

[0009] The actuator is mounted on the reaction frame system and positioned above the specimen to provide the load required for the test;

[0010] The force sensor is used to collect the load magnitude of the actuator and provide feedback to the control system;

[0011] The control system is used to adjust the actuator load and control the actuator loading value;

[0012] The spring clamp arm is installed below the actuator and hinged to the wheel load simulation device to push the roller of the wheel load simulation device to roll horizontally and provide wheel pressure load to the specimen.

[0013] The wheel-load simulation device has at least one set of rollers that act on the specimen;

[0014] The loading stage is used to fix and place the test specimen.

[0015] The spring clamp arm includes two sets of clamp arms, the upper ends of which are hinged together, and the lower ends are respectively connected to the two ends of the spring; the wheel load simulation device is hinged to the lower ends of the two sets of clamp arms.

[0016] The wheel load simulation device also includes a mounting plate, which is hinged to the lower end of the clamping arm, and the roller is mounted on the mounting plate.

[0017] The rollers of the wheel load simulation device are configured as single-row single-wheel, single-row multi-wheel, double-row single-wheel, double-row multi-wheel, and to simulate vehicle loads with different wheel pressures.

[0018] A fatigue test method for wheeled loads on bridges and pavements, employing the aforementioned fatigue test system for wheeled loads on bridges and pavements, includes the following steps:

[0019] Under the vertical load of the actuator, the spring clamp arm will generate horizontal and vertical components of force. The wheel load simulation device, which is hinged to the lower end of the spring clamp arm, will move along the surface of the specimen under the action of the horizontal component of force, and under the action of the vertical component of force, the wheel load simulation device will form wheel pressure in the normal direction of the surface of the specimen.

[0020] The force sensor collects the load magnitude, providing feedback to the actuator and the control system; the control system adjusts the load magnitude and controls the actuator's loading value.

[0021] The angle between the spring clamp arm and the surface of the specimen is adjusted to control the wheel pressure of the wheel load simulation device.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention transforms vertical loads into horizontal thrust and wheel pressure loads of the rollers, eliminating the complex design of traditional wheel-load fatigue testing devices. It has a simple structure, is easy to implement, and is convenient to operate.

[0024] Furthermore, the wheeled load bridge and road fatigue test system described in this invention can simulate various forms of vehicle loads such as single-row single-wheel, single-row multi-wheel, multi-row single-wheel, and multi-row multi-wheel. It can also meet the needs of wheeled loads acting in multiple directions. Moreover, the size and range of the wheeled load can be adjusted, solving the problems of limitations in specimen size, shape, and loading device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a wheeled load fatigue testing system for bridges and road surfaces according to the present invention;

[0026] Figure 2 This is a schematic diagram of the spring clamp arm.

[0027] Figure 3 This is a schematic diagram of the connection structure between the spring clamp arm and the wheel load simulation device;

[0028] Figure 4 A schematic diagram of the connection structure between the spring clamp arm and the mounting plate of the wheel load simulation device;

[0029] Figure 5 A diagram showing the multi-axle single-wheel arrangement of a wheel-load simulation device;

[0030] Figure 6 A diagram showing the asymmetrical multi-axle, multi-wheel arrangement of a wheel-borne simulation device;

[0031] Figure 7 This is a diagram showing the symmetrical multi-axis, multi-wheel arrangement of a wheel-borne simulation device. Detailed Implementation

[0032] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of the present invention.

[0033] like Figure 1 As shown, a fatigue testing system for wheel loads on bridges and pavements includes a reaction frame system 1, an actuator 2, a force sensor 3, a control system 6, a spring clamp arm 4, a wheel load simulation device 5, a specimen 7, and a loading platform 8.

[0034] Among them, the reaction frame system 1 bears the reaction force generated during the loading process and provides the space required for the experiment;

[0035] Actuator 2 provides the load required for the test;

[0036] The force sensor 3 is connected to the control system 6 and is used to measure the magnitude of the reaction force on the actuator 2, so as to evaluate the magnitude and state of the force on the specimen.

[0037] The control system 6 is used to control the loading and unloading process of the actuator 2, thereby controlling the size of the wheel load and the stroke of the wheel load simulation device 5.

[0038] The spring clamp arm 4 is used to push the wheel load simulation device 5 to move horizontally and to apply wheel pressure to the specimen 7;

[0039] The wheel load simulation device 5 is used to simulate vehicle wheel load;

[0040] The loading platform 8 is used to fix and place the test specimen 7.

[0041] like Figure 2 As shown, the spring clamping arm 4 includes two sets of clamping arms 41, the upper ends of the two sets of clamping arms 41 are hinged together, and the lower ends are respectively connected to the two ends of the spring 42; the wheel load simulation device 5 is hinged to the lower ends of the two sets of clamping arms.

[0042] like Figure 3 and Figure 4 As shown, the wheel load simulation device 5 also includes a mounting plate 51, which is hinged to the lower end of the clamping arm 41, and the roller 52 is mounted on the mounting plate 51.

[0043] like Figures 5 to 7 As shown, the rollers 52 of the wheel load simulation device 5 are configured as single-row single-wheel, single-row multi-wheel, double-row single-wheel, double-row multi-wheel, and to simulate vehicle loads with different wheel pressures.

[0044] The experimental method of this invention involves converting the vertical displacement of the actuator 2 into the horizontal displacement of the wheel load simulation device 5. Simultaneously, the thrust of the actuator 2 is converted into vehicle load wheel pressure and roller horizontal driving force. Only the same vertical actuator 2 is needed to simultaneously simulate wheel pressure and horizontal driving force. The wheel load simulation device 5, under the reciprocating action of the vertical actuator 2, can reciprocate along the surface of the specimen 7 to simulate vehicle wheel load.

[0045] The number, arrangement, and spring stiffness of the spring clamping arms 4 can all be adjusted as needed. Adjusting the number and arrangement of the clamping arms and springs can simulate various forms of vehicle loads, such as single-row single-wheel, single-row multi-wheel, multi-row single-wheel, and multi-row multi-wheel. In addition, adjusting the spring stiffness can change the magnitude of the internal force of the spring clamping arms 4, forming different wheel pressures, thereby simulating the loads of different vehicle models.

[0046] The present invention relates to a wheel-loaded bridge and road fatigue test method, wherein the wheel-loaded simulation device 5 is driven by a vertical actuator 2, and the relative magnitude of the wheel pressure and the horizontal thrust on the roller, as well as the stroke of the roller 52 on the surface of the specimen, can be adjusted by changing the angle between the spring clamp arm 4 and the surface of the specimen 7.

[0047] By adjusting the projection angle of the spring clamp arm 4 in the plane, multi-angle loading of the specimen 7 can be achieved, which can be used to study the differences in fatigue resistance of bridge decks and road surfaces in different directions.

[0048] The spring clamp arm 4 can be a spring straight arm, spring curved arm, support curved arm, folding curved arm, mechanical curved arm, or other device with a certain restoring force.

[0049] Advantages of this invention:

[0050] 1. This invention only requires a single vertical actuator 2 to simultaneously simulate wheel pressure and horizontal driving force, overcoming the limitations of existing test devices that can only simulate wheel pressure and achieve horizontal reciprocating motion through counterweights and horizontal actuator 2, thus expanding the loading method for wheel load fatigue testing.

[0051] 2. This invention can simulate various vehicle loads, such as single-axle single-wheel, single-axle multi-wheel, multi-axle single-wheel, and multi-axle multi-wheel, by adjusting the number and arrangement of clamping arms and springs, thus solving the problem of the single load form in wheel fatigue experiments.

[0052] 3. The present invention can change the wheel pressure and the stroke of the wheel load simulation device 5 by adjusting the spring stiffness in the spring clamp arm 4 and the angle between the clamp arm and the surface of the specimen, thereby increasing the applicability of the test device.

[0053] 4. The present invention uses force sensor 3 and control system 6 to control the reaction force of actuator 2 in real time, ensuring that the specimen is always subjected to a stable wheel load, thus overcoming the unloading problem caused by specimen fatigue.

[0054] 5. The wheeled load bridge and pavement fatigue test system provided by the present invention can apply wheeled loads in different directions on the surface of the specimen by rotating the spring clamp arm 4 to project the angle in the plane. It can be used to study the differences in fatigue resistance of bridge deck and pavement in all directions, and has a wider range of applications.

[0055] 6. The wheel-load bridge and road fatigue testing system provided by the present invention can be realized by modifying the existing hydraulic servo loading system, and the easily fatigued components such as springs and clamps are easy to replace and maintain.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A fatigue testing system for wheeled loads on bridges and road surfaces, characterized in that: It includes a reaction frame system (1), an actuator (2), a force sensor (3), a spring clamp (4), a wheel load simulation device (5), a control system (6), a specimen (7), and a loading platform (8); The reaction frame system (1) provides the space required for the test; The actuator (2) is mounted on the reaction frame system (1) and located above the specimen (7) to provide the load required for the test; The force sensor (3) is used to collect the load size of the actuator (2) and provide feedback to the control system (6); The control system (6) is used to adjust the load size of the actuator (2) and control the loading value of the actuator (2); The spring clamp arm (4) is installed below the actuator (2). The spring clamp arm (4) includes two sets of clamp arms (41). The upper ends of the two sets of clamp arms (41) are hinged together, and the lower ends are respectively connected to the two ends of the spring (42). The wheel load simulation device (5) is hinged to the lower ends of the two sets of clamp arms and is used to push the roller of the wheel load simulation device (5) to roll horizontally and provide wheel pressure load for the specimen (7). The wheel load simulation device (5) has at least one set of rollers (52) that act on the specimen (7); The rollers (52) of the wheel load simulation device (5) are configured as single-row single-wheel, single-row multi-wheel, double-row single-wheel or double-row multi-wheel to simulate vehicle loads with different wheel pressures; The loading stage (8) is used to fix and place the test specimen (7).

2. The bridge and road surface wheel load fatigue testing system according to claim 1, characterized in that: The wheel-load simulation device (5) further includes a mounting plate (51), which is hinged to the lower end of the clamping arm (41), and the roller (52) is mounted on the mounting plate (51).

3. A fatigue test method for wheeled loads on bridges and road surfaces, characterized in that, The bridge and road surface wheel load fatigue testing system according to claim 1 or 2 includes the following steps: The spring clamp arm (4) will generate horizontal and vertical components under the vertical load of the actuator (2). The wheel load simulation device (5) hinged to the lower end of the spring clamp arm (4) will move along the surface of the specimen (7) under the action of the horizontal component force. Under the action of the vertical component force, the wheel load simulation device (5) will form wheel pressure in the normal direction of the surface of the specimen (7). The force sensor (3) collects the load size and provides feedback to the actuator (2) and the control system (6); the control system (6) adjusts the load size and controls the load value of the actuator (2).

4. The fatigue test method for wheel loads on bridges and pavements according to claim 3, characterized in that, The wheel pressure of the wheel load simulation device (5) is adjusted by changing the angle between the spring clamp arm (4) and the surface of the specimen (7).

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