A loading device for studying the bonding performance of FRP cloth and concrete interface

Abstract

The present invention discloses a loading device for studying the interfacial bonding performance of FRP cloth and concrete, comprising a fixing unit, a positioning unit and a loading unit, wherein the fixing unit comprises a side plate, a load-bearing plate and a push plate, wherein the side plate, the load-bearing plate and the push plate form a frame structure and can fix a concrete block; the positioning unit is detachably connected to the load-bearing plate, and the positioning unit can make two groups of fixing units face each other; the two ends of the loading unit are respectively connected to the two groups of fixing units, and the two groups of loading units are arranged on both sides of the line connecting the two groups of fixing units. The present invention has a simple structure, is easy to install, can continuously apply a large load range, and uses the positioning unit to align the two groups of fixing units to avoid eccentric damage to the component to be tested. In addition, when the component to be tested is damaged, it bounces to both sides, and the push plate of the fixing unit can prevent the collapse caused by the sudden disappearance of shear force after a certain side of the component to be tested is damaged, thereby improving the safety factor of the test.

Description

Technical Field

[0001] The invention relates to the technical field of loading test, in particular to a loading device for studying the bonding performance of an FRP cloth and concrete interface. Background Art

[0002] The commonly used loading methods for long-term performance tests of traditional double shear peeling components include pile loading method, lever method, jack loading method and screw method.

[0003] The pile loading method has stable load, but due to space constraints, it requires a lot of heavy objects and the loading level is limited; the screw method relies on a reaction force device to provide loading and uses a universal testing machine to control the load size. The disadvantage is that due to the creep effect of the component, the load decreases over time; the lever method loading is based on the pile loading method. By increasing the length of the lever arm, the volume of the heavy object can be reduced, but the disadvantage is that the entire device still needs to occupy a large space. Moreover, the specimen under the lever method undergoes brittle failure. Due to the sudden disappearance of the force at one end, the entire device will suddenly overturn, posing a great safety hazard. Fixing the device can certainly solve this problem, but it will inevitably damage the integrity of the constant temperature and humidity chamber; the disadvantage of the existing jack loading method is that after calibrating the load size through the force sensor, it cannot avoid the situation where the load is weakened after the creep of the device and component. Similarly, if the component is suddenly damaged, part of the device will collapse, which is very dangerous.

[0004] Therefore, how to change the current situation of weakened loading load and poor loading safety in performance tests in the prior art has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a loading device for studying the interfacial bonding performance of FRP cloth and concrete, so as to solve the problems existing in the above-mentioned prior art, so that the device can continuously load the test piece during the test and improve the test safety factor.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a loading device for studying the interfacial bonding performance of FRP cloth and concrete, comprising:

[0007] A fixing unit, the fixing unit comprising a side plate, a load-bearing plate and a push plate, the two side plates are arranged in parallel, the load-bearing plate connects one end of the two side plates, the push plate is slidably arranged between the two side plates, the side plates, the load-bearing plate and the push plate form a frame structure and can fix the concrete block; the number of the fixing units is two groups, and the two groups of fixing units are symmetrically arranged;

[0008] A positioning unit, wherein the positioning unit is detachably connected to the bearing plate, the positioning unit can make the two groups of the fixing units face each other, and the push plate is located at a side of the fixing unit away from the positioning unit;

[0009] A loading unit, both ends of which are respectively connected to the two groups of the fixing units, the number of the loading units is two, and the two groups of the loading units are arranged on both sides of the connection line of the two groups of the fixing units.

[0010] Preferably, the loading unit comprises an arm plate and a jack, one end of the arm plate is connected to the side plate, the jack is connected to the arm plate, the jack is a mechanical jack, and a force sensor is connected to the force-applying end of the jack.

[0011] Preferably, a reinforcing plate is further arranged between the arm plate and the side plate, one end of the reinforcing plate is connected to the side plate, the long side of the reinforcing plate is arranged parallel to the long side of the arm plate, and the arm plate, the side plate and the reinforcing plate are arranged perpendicularly to each other.

[0012] Preferably, the positioning unit includes a positioning screw, a positioning catheter, a calibration catheter and a safety lock. The positioning catheter is located between the two bearing plates. The positioning screw passes through the two bearing plates, the positioning catheter and the calibration catheter and is threadedly connected to the safety lock. The calibration catheter and the positioning catheter are located on both sides of the bearing plate. The calibration catheter is abutted against the bearing plate on the side close to the force-applying end of the loading unit, and the calibration catheter can be plugged and connected to the bearing plate.

[0013] Preferably, the number of the positioning units is four groups, the four groups of positioning units are located at the four corners of the bearing plate, and the connecting lines of the four groups of positioning units are rectangular.

[0014] Preferably, the fixing unit further comprises a tail plate, the tail plate connects the two side plates, the tail plate and the load-bearing plate are respectively located at two ends of the side plates, and the push plate is located between the load-bearing plate and the tail plate.

[0015] Preferably, the fixing unit further comprises a push rod, one end of which is connected to the push plate, and the other end of which is slidably connected to the tail plate.

[0016] Preferably, the fixing unit further comprises a reinforcing plate, the reinforcing plate is connected to the tail plate, and the reinforcing plate is arranged on a side of the tail plate away from the push plate.

[0017] Preferably, a rubber pad is provided on one side of the push plate close to the load-bearing plate; and the rubber pad is detachably connected to the push plate.

[0018] Preferably, the bearing plate is in an I-shape.

[0019] Compared with the prior art, the present invention has achieved the following technical effects: the loading device for studying the interfacial bonding performance of FRP cloth and concrete of the present invention comprises a fixing unit, a positioning unit and a loading unit, wherein the fixing unit comprises a side plate, a load-bearing plate and a push plate, the two side plates are arranged in parallel, the load-bearing plate is connected to one end of the two side plates, the push plate is slidably arranged between the two side plates, the side plates, the load-bearing plate and the push plate form a frame structure and can fix the concrete block; the number of the fixing units is two groups, and the two groups of fixing units are symmetrically arranged; the positioning unit is detachably connected to the load-bearing plate, the positioning unit can make the two groups of fixing units face each other, and the push plate is located on the side of the fixing unit away from the positioning unit; the two ends of the loading unit are respectively connected to the two groups of fixing units, the number of the loading units is two groups, and the two groups of loading units are arranged on both sides of the line connecting the two groups of fixing units.

[0020] The loading device for studying the interfacial bonding performance of FRP cloth and concrete of the present invention has a frame formed by the side plates, load-bearing plates and push plates in the fixing unit that can fix two concrete blocks, align the two sets of fixing units by using the positioning unit, and then connect the two concrete blocks by using the fiber cloth (FRP) with epoxy resin glue, and continuously load the component to be tested (the component to be tested here refers to the structure constructed by the concrete block and FRP) by using the loading units on both sides of the fixing unit, and load until the failure mode is the peeling of FRP and the concrete block. The loading device for studying the interfacial bonding performance of FRP cloth and concrete of the present invention has a simple structure, is easy to install, can continuously apply a large load range, and uses the positioning unit to align the two sets of fixing units to avoid eccentric failure of the component to be tested. In addition, when the component to be tested is destroyed, it bounces to both sides, and the push plates of the fixing unit can prevent the collapse caused by the sudden disappearance of shear force after one side of the component to be tested is destroyed, thereby improving the safety factor of the test. The loading device for studying the interfacial bonding performance of FRP cloth and concrete of the present invention can be directly applied to a universal testing machine, has a small size, saves space compared with the loading equipment in the prior art, is easy to use, and improves the flexibility and adaptability of the loading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic structural diagram of a loading device for studying the interfacial bonding performance between FRP cloth and concrete according to the present invention;

[0023] Figure 2It is a structural schematic diagram of a positioning unit of a loading device for studying the interfacial bonding performance of FRP cloth and concrete according to the present invention;

[0024] Among them, 1 is a fixing unit, 101 is a side plate, 102 is a load-bearing plate, 103 is a push plate, 104 is a tail plate, 105 is a push rod, 106 is a reinforcement plate, 107 is a rubber pad, 2 is a positioning unit, 201 is a positioning screw, 202 is a positioning guide tube, 203 is a calibration guide tube, 204 is a safety lock, 3 is a loading unit, 301 is an arm plate, 302 is a jack, 303 is a reinforcement plate, and 304 is a force sensor. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a loading device for studying the interfacial bonding performance of FRP cloth and concrete, so as to solve the problems existing in the above-mentioned prior art, so that the device can continuously load the test piece during the test and improve the test safety factor.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figure 1-2 ,in, Figure 1 It is a schematic structural diagram of a loading device for studying the interfacial bonding performance between FRP cloth and concrete according to the present invention; Figure 2 The figure is a schematic structural diagram of a positioning unit of a loading device for studying the interfacial bonding performance between FRP cloth and concrete according to the present invention.

[0029] The present invention provides a loading device for studying the interfacial bonding performance of FRP cloth and concrete, comprising a fixing unit 1, a positioning unit 2 and a loading unit 3, wherein the fixing unit 1 comprises a side plate 101, a bearing plate 102 and a push plate 103, the two side plates 101 are arranged in parallel, the bearing plate 102 is connected to one end of the two side plates 101, the push plate 103 is slidably arranged between the two side plates 101, the side plates 101, the bearing plates 102 and the push plate 103 form a frame structure and can fix concrete blocks; the number of the fixing units 1 is two groups, and the two groups of fixing units 1 are symmetrically arranged; the positioning unit 2 is detachably connected to the bearing plate 102, the positioning unit 2 can make the two groups of fixing units 1 face each other, and the push plate 103 is located on a side of the fixing unit 1 away from the positioning unit 2; the two ends of the loading unit 3 are respectively connected to the two groups of fixing units 1, the number of the loading units 3 is two groups, and the two groups of loading units 3 are arranged on both sides of the connection line of the two groups of fixing units 1.

[0030] The loading device for studying the interfacial bonding performance of FRP cloth and concrete of the present invention, the frame surrounded by the side plate 101, the load-bearing plate 102 and the push plate 103 in the fixing unit 1 can fix two concrete blocks, the two groups of fixing units 1 are aligned by the positioning unit 2, and then the two concrete blocks are connected by the fiber cloth (FRP) with epoxy resin glue, and during the test, the loading units 3 on both sides of the fixing unit 1 are used to continuously load the test component (here, the test component refers to the structure composed of the concrete block and the FRP) until the failure mode is the peeling of the FRP and the concrete block. The loading device for studying the interfacial bonding performance of FRP cloth and concrete of the present invention has a simple structure, is easy to install, can continuously apply a large load range, and uses the positioning unit 2 to align the two groups of fixing units 1 to avoid eccentric failure of the test component. In addition, when the test component is damaged, it bounces to both sides, and the push plate 103 of the fixing unit 1 can prevent the collapse caused by the sudden disappearance of the shear force after one side of the test component is damaged, thereby improving the safety factor of the test.

[0031] Specifically, the loading unit 3 includes an arm plate 301 and a jack 302. One end of the arm plate 301 is connected to the side plate 101, and the jack 302 is connected to the arm plate 301. The jack 302 is a mechanical jack. The loading method of the jack 302 is adopted. The jack 302 uses the arm plate 301 to apply a load to the component to be tested, which avoids the space for stacking heavy objects in the prior art, and also saves the space for the lever arm, saving the space occupied by the continuous loading device; in addition, a force sensor 304 is connected to the force-applying end of the jack 302. The force sensor 304 can monitor the loading load in real time, keep the loading stable, and can add the load weakened by the creep of the device and the component to be tested at any time, so as to maintain the loading reliability. It should also be noted that the loading point of the jack 302 uses the fixing method of the round steel column and the groove, which has high and stable force transmission efficiency and improves the reliability of the device.

[0032] Among them, a reinforcing plate 303 is also arranged between the arm plate 301 and the side plate 101, one end of the reinforcing plate 303 is connected to the side plate 101, the long side of the reinforcing plate 303 is arranged parallel to the long side of the arm plate 301, the arm plate 301, the side plate 101 and the reinforcing plate 303 are arranged perpendicular to each other, and the reinforcing plate 303 improves the connection reliability between the loading unit 3 and the fixing unit 1, and enhances the structural strength of the device.

[0033] More specifically, the positioning unit 2 includes a positioning screw 201, a positioning catheter 202, a calibration catheter 203 and a safety lock 204. The positioning catheter 202 is located between the two bearing plates 102. The positioning catheter 202 can be used to fix the distance between the two groups of fixed units 1. The positioning screw 201 passes through the two bearing plates 102, the positioning catheter 202 and the calibration catheter 203 and is threadedly connected to the safety lock 204. The calibration catheter 203 and the positioning catheter 202 are located on both sides of the bearing plates 102. The calibration catheter 203 is against the bearing plates 102 on the side close to the force-applying end of the loading unit 3. The calibration catheter 203 can be plugged and connected to the bearing plates 102. The plugging of the calibration catheter 203 with the bearing plates 102 can position the two groups of fixed units 1 so that the two groups of fixed units 1 are facing each other, thereby avoiding eccentric damage to the tested components during the test, obtaining the expected results and effectively controlling unnecessary variables in the test. During the test, the calibration guide tube 203 is pulled out from the positioning guide tube 202, the safety lock 204 is loosened, and the force is applied by the jack 302. The failure mode is the peeling of the FRP and the concrete block. It should also be noted that the end of the positioning screw 201 away from the safety lock 204 is a bare rod to reduce the manufacturing difficulty.

[0034] In this specific embodiment, there are four groups of positioning units 2, which are located at the four corners of the load-bearing plate 102. The connecting lines of the four groups of positioning units 2 are rectangular. Four groups of positioning units 2 are used to further improve the positioning accuracy of the positioning units 2, control the distance between the two groups of fixing units 1 and align the two groups of fixing units 1, thereby improving the accuracy of the test.

[0035] In order to further improve the structural strength of the device, the fixing unit 1 also includes a tail plate 104, which connects the two side plates 101. The tail plate 104 and the load-bearing plate 102 are respectively located at both ends of the side plates 101, and the push plate 103 is located between the load-bearing plate 102 and the tail plate 104. The provision of the tail plate 104 improves the structural stability of the fixing unit 1, thereby improving the stability and reliability of the test process.

[0036] In addition, in order to facilitate the reciprocating motion of the push plate 103, the fixing unit 1 further includes a push rod 105, one end of which is connected to the push plate 103, and the other end of which is slidably connected to the tail plate 104. In this specific embodiment, each push plate 103 is connected to two parallel push rods 105, which improves the force uniformity of the push plate 103, thereby ensuring the accuracy of the reciprocating motion of the push plate 103, and providing convenience for fixing the concrete block.

[0037] In addition, in order to further improve the structural strength of the device, the fixing unit 1 also includes a reinforcement plate 106, which is connected to the tail plate 104. The reinforcement plate 106 is arranged on the side of the tail plate 104 away from the push plate 103. Each tail plate 104 is connected to two reinforcement plates 106. The reinforcement plates 106 are located on both sides of the push rod 105 to avoid affecting the reciprocating sliding of the push rod 105.

[0038] Furthermore, a rubber pad 107 is provided on one side of the push plate 103 close to the load-bearing plate 102, which can not only protect the push plate 103 but also increase the friction between the push plate 103 and the concrete block, thereby enhancing the fixing effect of the fixing unit 1; the rubber pad 107 is detachably connected to the push plate 103, so that the rubber pad 107 can be replaced after being worn.

[0039] In this specific embodiment, the load-bearing plate 102 is in an I-shape, and four groups of positioning units 2 are connected to the four corners of the load-bearing plate 102. The middle recess of the load-bearing plate 102 is convenient for setting FRP and connecting it to the concrete block. The symmetrical structure improves the force uniformity of the load-bearing plate 102. In other specific embodiments of the present invention, the specific structure of the load-bearing plate 102 can also be set according to test requirements.

[0040] The loading device for studying the bonding performance of the FRP cloth and concrete interface of the present invention is suitable for the long-term performance test of double shear peeling components, and is also suitable for the durability test of double shear peeling components under load and environmental action. Compared with the prior art, the present invention sets a force sensor 304 at the force-applying end of the jack 302 for real-time monitoring, so that the load is stable and the load weakened by the creep of the device and the tested component can be supplemented at any time; secondly, a positioning guide tube 202 is set in the positioning unit 2 to control the distance between the two concrete blocks, and the calibration guide tube 203 makes the two sets of fixing units 1 aligned, so as to avoid eccentric damage to the tested component, obtain the expected results and effectively control the unnecessary variables in the test; in addition, on the one hand, a safety lock 204 is set in the positioning unit 2 to prevent the device from bouncing toward both sides when the tested component is damaged, and on the other hand, the push plate 103 in the fixing unit 1 is used to prevent the collapse caused by the sudden disappearance of the shear force after a certain side of the tested component is damaged, thereby improving the safety factor of the device and the test. The loading device for studying the bonding performance of the FRP cloth and concrete interface of the present invention has a simple structure, is easy to install, can apply a large load range, is not limited by the space required by the lever arm, and can load multiple beams at the same time, greatly improving the loading efficiency.

[0041] It is also necessary to explain that the component to be tested mentioned in the present invention is composed of a concrete block and FRP, and therefore, the “component to be tested” mentioned in the text is not inconsistent with the “concrete block” and “FRP”.

[0042] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A loading device for studying the bonding performance of FRP cloth and concrete interface, characterized in that: include: A fixing unit, the fixing unit comprising a side plate, a load-bearing plate and a push plate, the two side plates are arranged in parallel, the load-bearing plate connects one end of the two side plates, the push plate is slidably arranged between the two side plates, the side plates, the load-bearing plate and the push plate form a frame structure and can fix the concrete block; the number of the fixing units is two groups, and the two groups of fixing units are symmetrically arranged; A positioning unit, wherein the positioning unit is detachably connected to the bearing plate, the positioning unit can make the two groups of the fixing units face each other, and the push plate is located at a side of the fixing unit away from the positioning unit; A loading unit, wherein both ends of the loading unit are respectively connected to the two groups of the fixing units, the number of the loading units is two, and the two groups of the loading units are arranged on both sides of the connection line of the two groups of the fixing units; The loading unit comprises an arm plate and a jack, one end of the arm plate is connected to the side plate, the jack is connected to the arm plate, the jack is a mechanical jack, and a force sensor is connected to the force-applying end of the jack; The positioning unit includes a positioning screw, a positioning catheter, a calibration catheter and a safety lock. The positioning catheter is located between the two bearing plates. The positioning screw passes through the two bearing plates, the positioning catheter and the calibration catheter and is threadedly connected to the safety lock. The calibration catheter and the positioning catheter are located on both sides of the bearing plate. The calibration catheter is abutted against the bearing plate on the side close to the force-applying end of the loading unit, and the calibration catheter can be plugged and connected to the bearing plate.

2. The loading device for studying the bonding performance of the FRP cloth and concrete interface according to claim 1 is characterized in that: A reinforcing plate is also arranged between the arm plate and the side plate, one end of the reinforcing plate is connected to the side plate, the long side of the reinforcing plate is arranged parallel to the long side of the arm plate, and the arm plate, the side plate and the reinforcing plate are arranged perpendicularly to each other.

3. The loading device for studying the bonding performance of the FRP cloth and concrete interface according to claim 1 is characterized in that: The number of the positioning units is four groups, the four groups of positioning units are located at the four corners of the load-bearing plate, and the connecting lines of the four groups of positioning units are rectangular.

4. The loading device for studying the bonding performance of the FRP cloth and concrete interface according to claim 1 is characterized in that: The fixing unit further comprises a tail plate, which is connected to the two side plates. The tail plate and the load-bearing plate are respectively located at two ends of the side plates, and the push plate is located between the load-bearing plate and the tail plate.

5. The loading device for studying the bonding performance of the FRP cloth and concrete interface according to claim 4 is characterized in that: The fixing unit further comprises a push rod, one end of which is connected to the push plate, and the other end of which is slidably connected to the tail plate.

6. The loading device for studying the interfacial bonding performance of FRP cloth and concrete according to claim 5 is characterized in that: The fixing unit further comprises a reinforcing plate, the reinforcing plate is connected to the tail plate, and the reinforcing plate is arranged on a side of the tail plate away from the push plate.

7. The loading device for studying the interfacial bonding performance of FRP cloth and concrete according to any one of claims 1 to 6, characterized in that: A rubber pad is arranged on one side of the push plate close to the load-bearing plate; the rubber pad is detachably connected to the push plate.

8. The loading device for studying the bonding performance of the interface between FRP cloth and concrete according to any one of claims 1 to 6, characterized in that: The load-bearing plate is in an I-shape.

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