An experimental device for testing interface bonding performance of ECC reinforced concrete members

Abstract

The utility model discloses a kind of ECC reinforced concrete member interface bonding performance testing device, comprising: underframe, symmetrically installed with mounting bracket on underframe top;Mounting seat, mounting seat is horizontally slidably connected on underframe, mounting hole is opened on mounting seat, and shrinkage fixture is installed on one side of mounting hole;Linear loading mechanism, linear loading mechanism includes linear loading assembly and loading seat, and FRP sheet fixture is installed on loading seat;Deflection loading mechanism, deflection loading mechanism includes mounting plate rotatably connected on mounting bracket;Tension monitoring system, linear loading assembly and deflection loading assembly are respectively installed with tension monitoring system;Control system, control system is used to control device operation.The utility model can realize linear tension and deflection force loading synchronously, accurately restore ECC reinforced concrete member in actual service in tensile bending composite stress state, solve the problem that traditional test result and engineering actual deviation is larger, and test scientificity is stronger.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering structural testing technology, and in particular to a test device for the interfacial bonding performance of ECC-reinforced concrete components. Background Technology

[0002] In the field of civil engineering, concrete structures often suffer from strength degradation and crack propagation due to factors such as increased service life, higher load levels, or environmental erosion, requiring reinforcement techniques to restore or enhance their load-bearing capacity. ECC, as a new type of composite material with high toughness, high crack resistance, and good durability, is widely used in the reinforcement and repair of concrete components. Its combined reinforcement system with FRP sheets, leveraging the synergistic advantages of ECC's energy-absorbing buffer and FRP's high tensile strength, can effectively inhibit the propagation of concrete cracks and improve the overall mechanical properties of the structure.

[0003] Interfacial bonding performance is a core critical factor in ECC-FRP reinforced concrete systems. The ability of the interface to reliably transfer stress directly determines the reinforcement effect. If bonding failure occurs at the interface (such as peeling or slippage), the high strength performance of the FRP sheet cannot be fully utilized, and it may even lead to premature structural failure. Therefore, accurately testing and understanding the bonding strength, load-slip relationship, and failure mechanism of this interface is an important prerequisite for optimizing reinforcement design and ensuring structural safety.

[0004] The existing interfacial bonding performance testing equipment has the following main shortcomings: Traditional devices can only achieve unidirectional linear tensile loading. However, in actual engineering, ECC-strengthened concrete components often bear complex forces (such as tension-bending combined action). The interface is not only subjected to axial tensile force, but also to shear stress due to component deflection. A single loading mode cannot simulate the real stress conditions, resulting in a large deviation between the test results and the actual service conditions.

[0005] To address the aforementioned technical issues, this utility model provides a test device for the interfacial bonding performance of ECC-reinforced concrete components. Utility Model Content

[0006] The purpose of this invention is to provide a test device for the interfacial bonding performance of ECC-reinforced concrete components, so as to solve the problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides the following solution: This utility model provides a test device for the interfacial bond performance of ECC-strengthened concrete components, comprising: The base frame has mounting brackets symmetrically installed on its top; Mounting base, which is horizontally slidably connected to the base frame. Mounting base has mounting holes and a shrink clamp is installed on one side of the mounting holes. The specimen can be detachably installed in the mounting holes through the shrink clamp. A linear loading mechanism includes a linear loading component and a loading seat. The loading seat is horizontally slidably connected to the base frame. An FRP sheet clamp is mounted on the loading seat for clamping an FRP sheet protruding from the specimen. The linear loading component is installed between the loading seat and the mounting frame and is used to output a linear loading force. A deflection loading mechanism includes a mounting plate rotatably connected to the mounting frame, a component holder mounted on the mounting plate, a component fixed on the component holder, and a deflection loading assembly mounted on the base frame, the deflection loading assembly being rotatably connected to the mounting plate. A tensile monitoring system is installed on the linear loading component and the deflection loading component, respectively. A control system, which is used to control the operation of the device.

[0008] According to the ECC-strengthened concrete component interfacial bonding performance test device provided by this utility model, the linear loading component includes a linear loading hydraulic cylinder, which is horizontally fixed on the mounting frame, and the output end of the linear loading hydraulic cylinder is fixed to one side of the loading seat.

[0009] According to the ECC-reinforced concrete component interfacial bonding performance test device provided by this utility model, the deflection loading component includes two sets of symmetrically arranged deflection loading hydraulic cylinders. The bottom of the deflection loading hydraulic cylinder is rotatably connected to the base frame, and the output end of the deflection loading hydraulic cylinder is rotatably connected to the back side of the mounting plate.

[0010] According to the ECC-reinforced concrete component interfacial bonding performance test device provided by this utility model, a crossbeam is fixed between the two sets of mounting seats. The crossbeam is located on the top of the mounting seats, and a camera is mounted on the crossbeam. The camera is arranged correspondingly to the mounting seats.

[0011] According to the ECC-reinforced concrete component interfacial bond performance testing device provided by this utility model, the tensile force monitoring system includes a tensile force sensor. According to the ECC-reinforced concrete component interfacial bond performance testing device provided by this utility model, a positioning cylinder is vertically fixedly connected to the top of the mounting frame, a positioning plate is vertically slidably connected to the mounting frame, a positioning groove is formed on the positioning plate, the positioning groove engages with the top of the mounting plate, and the output end of the positioning cylinder is fixed to the top of the positioning plate.

[0012] According to the ECC-reinforced concrete component interfacial bonding performance test device provided by this utility model, a linear track is installed on the base frame, the loading seat and the mounting seat are slidably connected on the linear track, and scale lines are provided on the linear track.

[0013] The present invention discloses the following technical effects: This invention can simultaneously apply linear tensile force and deflection force, accurately reproducing the tensile-bending combined stress state of ECC-reinforced concrete components in actual service, and fully capturing the bonding response and failure mechanism of the interface under complex stress. It solves the problem of large deviation between traditional test results and actual engineering conditions, making the test more scientific.

[0014] The clamping structure is stable and adaptable. The shrink clamp, FRP sheet clamp and component holder are specifically designed to clamp firmly and avoid local stress concentration, effectively preventing the specimen or FRP sheet from loosening and premature failure. At the same time, it is compatible with ECC layers of different thicknesses, various types of FRP sheets and concrete components with different cross sections, with strong versatility, which greatly reduces test errors and improves the accuracy of test data. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. 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 interfacial bond performance testing device for ECC-reinforced concrete members according to this utility model. Figure I ; Figure 2 This is a schematic diagram of the interfacial bond performance testing device for ECC-reinforced concrete members according to this utility model. Figure II .

[0017] The components include: 1. Base frame; 2. Mounting frame; 3. Mounting base; 4. Shrink clamp; 5. Loading base; 6. Mounting plate; 7. Component holder; 8. Linear loading hydraulic cylinder; 9. Deflection loading hydraulic cylinder; 10. Crossbeam; 11. Positioning cylinder; 12. Positioning plate; and 13. Linear track. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-2 This utility model provides a test device for the interfacial bond performance of ECC-strengthened concrete components, comprising: Base frame 1, with mounting brackets 2 symmetrically mounted on the top of the base frame 1; Mounting base 3 is horizontally slidably connected to the base frame 1. Mounting base 3 has mounting holes. A shrink clamp 4 is installed on one side of the mounting hole. The specimen can be detachably installed in the mounting hole through the shrink clamp 4. A linear loading mechanism includes a linear loading component and a loading seat 5. The loading seat 5 is horizontally slidably connected to the base frame 1. An FRP sheet clamp is installed on the loading seat 5. The FRP sheet clamp is used to clamp the FRP sheet protruding from the specimen. The linear loading component is installed between the loading seat 5 and the mounting frame 2. The linear loading component is used to output a linear loading force. A deflection loading mechanism includes a mounting plate 6 rotatably connected to the mounting frame 2, a component holder 7 mounted on the mounting plate 6, a component fixed on the component holder 7, and a deflection loading assembly mounted on the base frame 1, the deflection loading assembly being rotatably connected to the mounting plate 6. A tensile monitoring system is installed on the linear loading component and the deflection loading component, respectively. A control system, which is used to control the operation of the device.

[0021] Before the test, the ECC-reinforced concrete specimen was detachably fixed in the mounting hole using the shrinkage clamp 4 on the mounting base 3 to ensure a secure installation. Then, the protruding FRP sheet from the specimen was precisely clamped in the FRP sheet clamp of the loading base 5, while the other end of the component was fixed using the component holder 7 of the deflection loading mechanism, completing the entire specimen assembly. After the control system was activated, the linear loading component output a linear loading force to the loading base 5, pushing the loading base 5 to slide horizontally along the base frame 1, applying axial tension to the FRP sheet. Simultaneously, the deflection loading component on the base frame 1 drove the mounting plate 6 to rotate around the mounting frame 2, applying a deflection force to the component, achieving coordinated loading of linear tension and deflection force to simulate the composite stress conditions of the component in actual service. Throughout the loading process, the tensile monitoring system collects force data from the linear loading component and the deflection loading component in real time, and simultaneously captures the slip behavior and stress transfer state of the interface between the FRP sheet and the ECC concrete. The control system adjusts the loading process according to the preset loading rate and deflection angle to ensure stable and controllable loading. Finally, a comprehensive evaluation of the interfacial bonding performance is completed through the collected force-slip curves, failure modes, and other data.

[0022] In a further optimized design, the linear loading assembly includes a linear loading hydraulic cylinder 8, which is horizontally fixed on the mounting bracket 2, and the output end of the linear loading hydraulic cylinder 8 is fixed to one side of the loading seat 5.

[0023] The linear loading assembly uses a linear loading hydraulic cylinder 8 as its core power source. Its horizontal fixation to the mounting bracket 2 ensures that the loading direction is aligned with the force axis of the FRP sheet, preventing loading eccentricity. During operation, the control system outputs a drive signal to the linear loading hydraulic cylinder 8, causing the piston rod to extend or retract horizontally. Through a rigid connection between the output end and the loading seat 5, hydraulic energy is converted into a stable linear loading force. The loading seat 5 slides horizontally under the constraint of the linear track 13, thereby causing axial tensile displacement of the FRP sheet via the FRP sheet clamp, achieving axial tensile loading on the ECC-concrete interface. The hydraulic drive characteristics of the hydraulic cylinder allow for precise control of the loading force, loading rate, and holding time, ensuring stable and controllable axial tensile force to meet the needs of different test loading conditions and providing precise power input for testing interface bond strength and axial slip characteristics.

[0024] In a further optimized design, the deflection loading assembly includes two sets of symmetrically arranged deflection loading hydraulic cylinders 9. The bottom of the deflection loading hydraulic cylinder 9 is rotatably connected to the base frame 1, and the output end of the deflection loading hydraulic cylinder 9 is rotatably connected to the back side of the mounting plate 6.

[0025] The deflection loading assembly employs two symmetrically arranged deflection loading hydraulic cylinders 9. Through a double-hinged design—"the bottom is rotatably connected to the base frame 1, and the output end is rotatably connected to the back of the mounting plate 6"—motion interference during loading is eliminated. During operation, the control system synchronously regulates the extension and retraction of the two hydraulic cylinders, using symmetrical driving torque to drive the mounting plate 6 to rotate around the pivot point of the mounting frame 2. The mounting plate 6, through the component holder 7, causes the other end of the specimen to deflect, simulating the bending stress state of ECC-strengthened concrete components in actual service, causing the interface to simultaneously bear the combined effects of axial tensile force and shear stress. The symmetrical arrangement ensures uniform transmission of the deflection force, preventing premature failure due to excessive force on one side of the specimen, while the hinged design ensures continuously adjustable deflection angles, accurately reproducing the interface stress conditions under different degrees of bending.

[0026] In a further optimized design, a crossbeam 10 is fixed between the two sets of mounting bases 3. The crossbeam 10 is located on top of the mounting base 3, and a camera is mounted on the crossbeam 10. The camera is arranged correspondingly to the mounting base 3.

[0027] By capturing the interface slip trajectory, crack initiation and propagation path, and failure morphology evolution through high-speed imaging technology, the visual data is synchronously correlated with the force data collected by the tensile sensor and the displacement data read from the track scale, realizing the three-in-one experimental data acquisition of "force-slip-morphology", providing intuitive visual evidence for the comprehensive analysis of the interface bonding failure mechanism.

[0028] To further optimize the solution, the tension monitoring system includes a tension sensor.

[0029] Tension sensors are installed on the force transmission paths of the linear loading hydraulic cylinder 8 and the deflection loading hydraulic cylinder 9, respectively. When the deflection loading hydraulic cylinder 9 applies a deflection force, the force causes elastic deformation of the strain gauge inside the sensor, resulting in a change in resistance. The sensor converts this physical deformation into an electrical signal and transmits it to the control system in real time. The control system amplifies, filters, and performs analog-to-digital conversion on the electrical signal, accurately outputting the real-time values ​​of the linear loading force and the deflection loading force. This provides feedback for closed-loop control of the loading process (such as maintaining a preset loading rate) and provides accurate mechanical parameters for subsequent data processing, ensuring the quantitative accuracy of the interfacial adhesion performance evaluation.

[0030] In a further optimized design, a positioning cylinder 11 is vertically fixedly connected to the top of the mounting bracket 2, and a positioning plate 12 is vertically slidably connected to the mounting bracket 2. A positioning groove is provided on the positioning plate 12, and the positioning groove engages with the top of the mounting plate 6. The output end of the positioning cylinder 11 is fixed to the top of the positioning plate 12.

[0031] The positioning cylinder 11 is vertically fixed to the top of the mounting bracket 2, and the positioning plate 12 is vertically slidably connected to the mounting bracket 2. The interlocking design between the positioning groove and the top of the mounting plate 6 achieves precise positioning. During the test preparation stage, the control system drives the piston rod of the positioning cylinder 11 to extend downward, pushing the positioning plate 12 down vertically along the mounting bracket 2 until the positioning groove is fully engaged with the top of the mounting plate 6, fixing the mounting plate 6 in its initial position and preventing the mounting plate 6 from shifting during specimen assembly. In a further optimized design, a linear track 13 is installed on the base frame 1, and the loading seat 5 and the mounting seat 3 are both slidably connected to the linear track 13. The linear track 13 is provided with scale lines.

[0032] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A test device for interfacial bond performance of ECC-strengthened concrete members, characterized in that, include: The base frame (1) has mounting brackets (2) symmetrically installed on its top. Mounting base (3), which is horizontally slidably connected to the base frame (1), and the mounting base (3) has a mounting hole. A shrink clamp (4) is installed on one side of the mounting hole. The specimen can be detachably installed in the mounting hole through the shrink clamp (4). A linear loading mechanism, comprising a linear loading component and a loading seat (5), wherein the loading seat (5) is horizontally slidably connected to the base frame (1), and an FRP sheet clamp is mounted on the loading seat (5) for clamping the FRP sheet extending from the specimen; the linear loading component is mounted between the loading seat (5) and the mounting frame (2) for outputting linear loading force; The deflection loading mechanism includes a mounting plate (6) rotatably connected to the mounting frame (2), a component holder (7) is mounted on the mounting plate (6), the component is fixed on the component holder (7), and a deflection loading assembly is mounted on the base frame (1). The deflection loading assembly is rotatably connected to the mounting plate (6). A tensile monitoring system is installed on the linear loading component and the deflection loading component, respectively. A control system, which is used to control the operation of the device.

2. The test device for interfacial bond performance of ECC-strengthened concrete components according to claim 1, characterized in that, The linear loading assembly includes a linear loading hydraulic cylinder (8), which is horizontally fixed on the mounting bracket (2), and the output end of the linear loading hydraulic cylinder (8) is fixed to one side of the loading seat (5).

3. The test device for interfacial bond performance of ECC-strengthened concrete components according to claim 1, characterized in that, The deflection loading assembly includes two sets of symmetrically arranged deflection loading hydraulic cylinders (9). The bottom of the deflection loading hydraulic cylinder (9) is rotatably connected to the base frame (1), and the output end of the deflection loading hydraulic cylinder (9) is rotatably connected to the back side of the mounting plate (6).

4. The test device for interfacial bond performance of ECC-strengthened concrete components according to claim 1, characterized in that, A crossbeam (10) is fixed between the two sets of mounting bases (3). The crossbeam (10) is located on the top of the mounting base (3). A camera is mounted on the crossbeam (10), and the camera is arranged corresponding to the mounting base (3).

5. The test device for interfacial bond performance of ECC-strengthened concrete components according to claim 1, characterized in that, The tension monitoring system includes a tension sensor.

6. The test device for interfacial bond performance of ECC-strengthened concrete components according to claim 1, characterized in that, The mounting bracket (2) is vertically fixed to the top of a positioning cylinder (11), and a positioning plate (12) is vertically slidably connected to the mounting bracket (2). The positioning plate (12) has a positioning groove, which engages with the top of the mounting plate (6). The output end of the positioning cylinder (11) is fixed to the top of the positioning plate (12).

7. The test device for interfacial bond performance of ECC-strengthened concrete components according to claim 1, characterized in that, A linear track (13) is installed on the base frame (1). The loading seat (5) and the mounting seat (3) are slidably connected to the linear track (13). The linear track (13) is provided with scale lines.

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