Testing Device for Interfacial Mechanical Properties of Metal-Cementitious Materials

Abstract

The present invention relates to the technical field of structural engineering, and discloses a testing device for the interfacial mechanical properties of a metal-cement-based material, which includes a support assembly, a loading frame, and a tangential actuator. The support assembly has a groove with a notch facing one side. The loading frame is a hollow structure with openings on both sides. The sizes of the groove and the loading frame match those of the test piece. The tangential actuator is fixedly arranged above one side of the notch of the groove. The testing device for the interfacial mechanical properties of a metal-cement-based material provided by the present invention is provided with a matching loading frame and groove, which can not only facilitate applying force to the loading frame to test the tangential shear resistance performance of the test piece, but also the groove and the loading frame can play a constraining role on the periphery of the test piece, avoiding lateral deformation of the test piece during the test, thereby reducing the influence of geometric deformation of the test piece on the mechanical properties and being conducive to obtaining stable and accurate mechanical property results.

Description

Technical Field

[0001] The present invention relates to the technical field of structural engineering, and particularly relates to a device for testing the interfacial mechanical properties of metal-cement-based materials. Background Art

[0002] Steel and concrete are currently the two engineering structural materials with the largest usage. Steel-concrete composite structures generally refer to structures composed of steel and concrete and working together, such as steel-concrete composite beams, concrete-filled steel tubes, steel reinforced concrete, etc. Composite structures have the characteristics of good mechanical properties and convenient construction, and have been widely used in long-span, bridge and high-rise structures.

[0003] During the force-bearing process of components, to ensure the co-working between the steel and concrete materials of the composite structure, reliable force transmission between the two must be ensured. For components provided with shear connectors, the push-out test is generally used to determine the interfacial shear resistance. For some components without shear connectors, clarifying the interfacial bonding-slip performance between steel and concrete is the basis for ensuring reliable internal force transmission between the two materials.

[0004] Currently, the following problems exist in the testing of the interfacial mechanical properties of steel and concrete: Since the tangential shear resistance of the interface between steel and concrete is greatly affected by the geometric deformation of the component, it is difficult to obtain stable interfacial mechanical property results. Summary of the Invention

[0005] Embodiments of the present invention provide a device for testing the interfacial mechanical properties of metal-cement-based materials, which is used to solve or partially solve the problem that it is difficult to obtain stable interfacial mechanical property results in the current testing of the interfacial mechanical properties of steel and concrete.

[0006] Embodiments of the present invention provide a device for testing the interfacial mechanical properties of metal-cement-based materials, including a support assembly, a loading frame and a tangential actuator. The support assembly has a groove with the notch facing one side. The loading frame is a hollow structure with openings on both sides. The sizes of the groove and the loading frame match the test piece. The tangential actuator is fixedly arranged above the notch side of the groove.

[0007] On the basis of the above solution, it further includes a vertically arranged guiding structure. The first side of the loading frame is connected to the notch of the groove, and the loading frame is movably connected to the guiding structure.

[0008] On the basis of the above solution, the guiding structure includes vertically arranged sliding rods. At least one sliding rod is respectively arranged on the opposite sides of the loading frame. Ear plates are connected at the positions corresponding to the sliding rods on the loading frame, and the ear plates are slidably sleeved on the sliding rods.

[0009] On the basis of the above scheme, it further includes a normal loading component, and the normal loading component includes a normal actuator, and the normal actuator is arranged on the second side of the loading frame.

[0010] On the basis of the above scheme, the normal loading assembly also includes a first end plate, a second end plate, a clamping member and a cross bar. The first end plate and the second end plate are arranged opposite to each other, the fixed end of the normal actuator is connected to the first end plate, and the loading end is facing the loading frame. The second end plate is located on the side of the groove away from the loading frame. One end of the clamping member is connected to the second end plate, and the other end is connected to the outer side of the bottom of the groove. The cross bar is arranged between the first end plate and the second end plate, and both ends are respectively connected to the first end plate and the second end plate.

[0011] On the basis of the above solution, a plurality of cross bars are arranged on the periphery of the normal actuator.

[0012] Based on the above solution, the loading end of the normal actuator is connected with a plate-shaped sliding structure.

[0013] On the basis of the above scheme, an adjusting piece is detachably connected to the groove bottom of the groove, the length of the adjusting piece protruding from the groove bottom of the groove is adjustable, and a plurality of the adjusting pieces are symmetrically distributed about the center of the groove.

[0014] On the basis of the above solution, the support assembly includes a base and a panel, the panel is vertically connected to the base, and the groove is arranged on one side of the panel.

[0015] Based on the above solution, a reinforcing rib is vertically connected to the other side of the panel.

[0016] An embodiment of the present invention provides a metal-cement-based material interface mechanical properties testing device, in which a loading frame and a groove are arranged to cooperate with each other, which can facilitate the application of force to the loading frame to perform a tangential shear performance test of the test piece. At the same time, the groove and the loading frame can constrain the test piece at its periphery, thereby preventing the test piece from undergoing lateral deformation during the test process, thereby reducing the influence of the geometric deformation of the test piece on the mechanical properties, and is conducive to obtaining stable and accurate mechanical property results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0018] Figure 1Schematic diagram of the overall device for testing the interfacial mechanical properties of metal-cementitious materials according to an embodiment of the present invention;

[0019] Figure 2 First schematic diagram of the loading frame and sliding rod arrangement in an embodiment of the present invention;

[0020] Figure 3 Second schematic diagram of the loading frame and sliding rod arrangement in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the structure of the normal loading component in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the support component in an embodiment of the present invention.

[0023] Explanation of reference numerals:

[0024] Among them, 1 - support component; 101 - base; 102 - panel; 103 - reinforcing rib plate; 104 - groove; 105 - threaded hole; 2 - slider sliding rod; 201 - loading frame; 202 - sliding rod; 203 - ear plate; 3 - normal loading component; 301 - first end plate; 302 - cross bar; 303 - nut; 304 - second end plate; 305 - normal actuator; 306 - pressing member; 307 - sliding structure; 4 - tangential actuator. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] An embodiment of the present invention provides a device for testing the interfacial mechanical properties of metal-cementitious materials. Refer to Figure 1, the mechanical property testing device includes a support assembly 1, a loading frame 201, and a tangential actuator 4. The support assembly 1 has a groove 104 with a notch facing one side. The loading frame 201 is a hollow structure with openings on both sides. The sizes of the groove 104 and the loading frame 201 match the test piece. The tangential actuator 4 is fixedly arranged above the notch side of the groove 104.

[0028] When performing mechanical property testing on the test piece, the test piece can be placed in the loading frame 201, and the loading frame 201 is placed on one side of the notch of the groove 104, and one side of the test piece is inserted into the groove 104. That is, when the test piece is being tested, a part is located in the groove 104 and a part is located in the loading frame 201. The tangential actuator 4 is above the notch side of the groove 104, that is, after the test piece is placed, the tangential actuator 4 is located above the loading frame 201. This enables the tangential actuator 4 to apply a downward force to the loading frame 201, thereby performing the mechanical property testing of the test piece.

[0029] For the metal-cementitious material interface mechanical property testing device provided in this embodiment, by setting the loading frame 201 and the groove 104 to cooperate, it is not only convenient to apply force to the loading frame 201 to test the tangential shear resistance performance of the test piece, but also the groove 104 and the loading frame 201 can play a constraining role on the periphery of the test piece, which can prevent the test piece from undergoing lateral deformation during the test, thereby reducing the influence of the geometric deformation of the test piece on the mechanical properties and facilitating the obtaining of stable and accurate mechanical property results.

[0030] Furthermore, the metal-cementitious material interface mechanical property testing device provided in this embodiment can be used to test the tangential shear resistance performance of the interface between steel and concrete. Because the tangential shear resistance ability of the interface between steel and concrete is greatly affected by the geometric deformation of the component, and the existing general testing devices have no constraint on lateral deformation, it is difficult to obtain stable interface mechanical property results. However, the mechanical property testing device provided in this embodiment sets the groove 104 and the loading frame 201 to constrain the test piece, which is beneficial to avoiding component deformation and obtaining more stable mechanical property results.

[0031] Furthermore, when the mechanical property testing device is used to test the tangential shear resistance performance of the interface between steel and concrete, the steel plate side of the test piece is inserted into the groove 104. And preferably, the depth of the groove 104 is the same as the thickness of the steel plate. So that the interface between the groove 104 and the loading frame 201 is the interface between steel and concrete.

[0032] Furthermore, the mechanical property testing device can also be used to test the mechanical properties of the interface between aluminum and concrete, etc. This device can measure the interface properties of any metal-cementitious material or other materials, and no specific limitation is made.

[0033] Based on the above embodiments, further, a mechanical property testing device further includes a vertically arranged guiding structure. The first side of the loading frame 201 is connected to the notch of the groove 104, and the loading frame 201 is movably connected to the guiding structure. The loading frame 201 can move along the guiding structure. By setting the guiding structure to be connected to the loading frame 201, the moving path of the loading frame 201 during the test can be restricted, so that when the test piece reaches its mechanical limit, the loading frame 201 and some of the test pieces inside move along the guiding structure, that is, move tangentially, which can improve the stability and accuracy of the test.

[0034] Based on the above embodiments, further, referring to Figure 2 and Figure 3 , the guiding structure includes vertically arranged sliding rods 202. At least one sliding rod 202 is respectively provided on the opposite sides of the loading frame 201. At the corresponding positions of the loading frame 201 and the sliding rods 202, there are connecting ear plates 203, and the ear plates 203 are slidably sleeved on the sliding rods 202. The loading frame 201 can move up and down along the sliding rods 202, thereby restricting the moving path of the loading frame 201.

[0035] Preferably, sliding rods 202 are respectively arranged on the opposite sides of the loading frame 201 adjacent to the first side. The loading frame 201 is connected to the sliding rods 202 on the opposite sides respectively, which can also prevent the loading frame 201 from having a horizontal offset and affecting the stability of the test.

[0036] Based on the above embodiments, further, referring to Figure 4 , a mechanical property testing device further includes a normal loading component 3. The normal loading component 3 includes a normal actuator 305, and the normal actuator 305 is arranged on the second side of the loading frame 201. The second side of the loading frame 201 is the side opposite to the first side. Since the normal force also has a relatively large influence on the shear resistance performance, in this embodiment, the influence of the normal force before and after the interface movement is considered in the testing device, and the normal loading component 3 is set. The normal actuator 305 can apply a normal force to the test piece, thereby controlling the normal force on the test piece during the test and improving the stability of the tangential shear resistance performance test of the test piece.

[0037] Based on the above embodiments, further, the normal loading component 3 further includes a first end plate 301, a second end plate 304, a tightening member 306, and a cross bar 302. The first end plate 301 and the second end plate 304 are arranged opposite to each other. The fixed end of the normal actuator 305 is connected to the first end plate 301, and the loading end faces the loading frame 201. The second end plate 304 is located on the side of the groove 104 away from the loading frame 201. One end of the tightening member 306 is connected to the second end plate 304, and the other end is connected to the outer side of the bottom of the groove 104. The cross bar 302 is arranged between the first end plate 301 and the second end plate 304, and both ends are respectively connected to the first end plate 301 and the second end plate 304 correspondingly.

[0038] The normal loading component 3 includes a first end plate 301, a second end plate 304, a normal actuator 305, a pressing member 306 and a cross bar 302. The first end plate 301 and the second end plate 304 are arranged oppositely. One side of the first end plate 301 facing the second end plate 304 is connected to the fixed end of the normal actuator 305. The loading end of the normal actuator 305 faces the second end plate 304. One side of the second end plate 304 facing the first end plate 301 is connected to one end of the pressing member 306. The two ends of the cross bar 302 are correspondingly connected to the first end plate 301 and the second end plate 304, and are fixed by the cross bar 302.

[0039] When performing a mechanical property test on the test piece, the normal loading component 3 is placed along the normal direction of the test piece, that is, the first end plate 301 is placed on the side of the loading frame 201 away from the groove 104, and the second end plate 304 is placed on the side of the groove 104 away from the loading frame 201. And the other end of the pressing member 306 away from the second end plate 304 is in contact with the outer side of the bottom of the groove 104. The loading end of the normal actuator 305 is in contact with the second side of the loading frame 201, and a normal acting force is applied to the test piece in the loading frame 201.

[0040] When the normal actuator 305 applies a force to the test piece, the loading end of the normal actuator 305 presses against the test piece. At the same time, the other end of the pressing member 306 will press against the outer side of the bottom of the groove 104, so that the normal loading component 3 can apply a stable normal acting force to the test piece without being installed and fixed. The set structure of the normal loading component 3 enables the normal loading component 3 not to be installed and fixed, which is convenient for the use and disassembly of the normal loading component 3, and thus convenient for the installation and disassembly of the test piece and the storage and transportation of the test device and the normal loading component 3, etc.

[0041] On the basis of the above embodiment, further, a plurality of cross bars 302 are arranged around the normal actuator 305. It is beneficial to the stability of the connection between the first end plate 301 and the second end plate 304, and further beneficial to applying a stable normal acting force to the test piece. Preferably, a plurality of cross bars 302 can be evenly arranged around the normal actuator 305.

[0042] Further, the two ends of the cross bar 302 and the first end plate 301 and the second end plate 304 can be respectively connected by threads. The two ends of the cross bar 302 can correspondingly pass through the first end plate 301 and the second end plate 304, and are connected to nuts 303 on the outer sides of the first end plate 301 and the second end plate 304.

[0043] Based on the above embodiments, further, a plate-shaped sliding structure 307 is connected to the loading end of the normal actuator 305. The loading end of the normal actuator 305 is the movable end. The sliding structure 307 can be a plate made of a material with a low coefficient of friction or a rolling resistance reduction device. This is to reduce the frictional force with the test piece, and thus when the test piece deforms and moves, it is convenient for the smooth movement of the test piece and avoids damage to the loading end of the normal actuator 305.

[0044] The sliding structure 307 is plate-shaped, which is convenient for contacting and applying force to the test piece. Rollers or balls can be provided on the side of the sliding structure 307 facing the test piece. This is to facilitate relative movement between the test piece and the sliding structure 307.

[0045] Based on the above embodiments, further, referring to Figure 5 , an adjusting member is detachably connected to the bottom of the groove 104. The length of the adjusting member protruding from the bottom of the groove 104 is adjustable. A plurality of adjusting members are symmetrically distributed about the center of the groove 104. By adjusting the length of the adjusting member protruding from the bottom of the groove 104, the depth of the groove 104 for accommodating the test piece can be adjusted, and thus the groove 104 can adapt to test pieces of different thicknesses, improving the applicability and flexibility of the test device.

[0046] Further, the adjusting member can be a bolt. Threaded holes 105 can be provided on the bottom of the groove 104 to connect with the bolt. By adjusting the length of the bolt screwed into the threaded hole 105, the length of the bolt protruding from the bottom of the groove 104 can be adjusted. A plurality of adjusting members are symmetrically distributed about the center of the groove 104, which can provide uniform and stable support for the test piece and improve the stability of the mechanical property test.

[0047] Based on the above embodiments, further, the support assembly 1 includes a base 101 and a panel 102. The panel 102 is vertically connected to the base 101, and the groove 104 is provided on one side of the panel 102.

[0048] Based on the above embodiments, further, a reinforcing rib plate 103 is vertically connected to the other side of the panel 102.

[0049] Based on the above embodiments, further, this embodiment proposes a mechanical property test device for the steel-concrete interface with high stability, which can consider the influence of the normal force before and after interface sliding. The mechanical property test device for the steel-concrete interface includes multiple components; the components include a support component 1, a slider and slide rod 2, a normal loading component 3, and a tangential actuator 4; the support component 1 includes a base 101, a panel 102, and a reinforcing rib plate 103, and there is a groove 104 on the panel 102; the bottom of the panel 102 and the reinforcing rib plate 103 are connected to the base 101. The slider and slide rod 2 includes a loading frame 201, an ear plate 203, and a slide rod 202; the loading frame 201 is connected to the ear plate 203, there are holes on the ear plate 203, the ear plate 203 slides up and down along the axial direction of the slide rod 202, and the slide rod 202 is vertically connected to the base 101. The normal loading component 3 includes end plates on both sides, a cross bar 302, a normal actuator 305, a nut 303, a sliding structure 307, and a pressing member 306; the end plates are connected to the normal actuator 305, the nut 303 is located outside the end plates, and the pressing member 306 is located between the end plates and the panel 102; the sliding structure 307 is connected to the loading end of the normal actuator 305; the tangential actuator 4 is fixed above the loading frame 201; the fixed end of the tangential actuator 4 can be fixed to other brackets or equipment foundations, so that the loading end of the tangential actuator 4 is connected to the upper part of the loading frame 201.

[0050] Among them, the ear plate 203 is located outside the loading frame 201. The cross bar 302 is located outside the normal actuator 305. Among them, the number of the cross bars 302 can be four or more. It should be particularly noted that the quantity and distribution of the cross bars 302 in this embodiment are only for illustrative purposes, and those skilled in the art can specifically set them according to actual needs.

[0051] The sliding structure 307 can be a low-friction coefficient material plate or a rolling resistance reduction device. Among them, the support component 1 (including the base 101, the panel 102, and the reinforcing rib plate 103), the slider and slide rod 2 (including the loading frame 201, the ear plate 203, and the slide rod 202), the end plates (including the first end plate 301 and the second end plate 304), the cross bar 302, the nut 303, and the pressing member 306 are all made of ordinary steel, high-strength steel, fire-resistant and weather-resistant steel, or stainless steel.

[0052] The mechanical property test device for the steel-concrete interface provided by this embodiment can ensure the relative tangential movement of the steel and concrete interfaces, provide relatively stable test results, and can reduce the influence of the friction resistance of the loading device itself.

[0053] This embodiment provides a steel-concrete interface mechanical property test device with high stability, which can consider the influence of normal force before and after interface sliding. It includes a backplane base 101, a slider slide rod 2, a normal loading component 3, and a tangential actuator 4. On the one hand, the loading frame 201 in the slider slide rod 2 assembly can provide sufficient stiffness for concrete loading, and the slide rod 202 can make the loading frame 201 move axially, ensuring the relative tangential movement between the steel and concrete interfaces. Good constraints can generate pure shear stress between the interfaces, avoiding unstable results caused by flexural-shear failure due to minor deformation of the components. On the other hand, the normal loading component 3 can provide normal stress for the specimen, and the friction coefficient of the sliding structure 307 is small, which can reduce the influence of friction resistance brought by the normal loading component 3 itself.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A testing device for the interfacial mechanical properties of a metal-cement-based material, characterized in that, The cam is an angular movement of the cam which is engaged with the movement of the actuator, and the actuator is engaged with the movement of the actuator member to form a rotation axis which is adapted to move the actuator member forward and downward along the axis of the actuator. The first side of the loading frame is connected to the notch of the groove, and the normal actuator is arranged on the second side of the loading frame.

2. The testing device for the interfacial mechanical properties of a metal-cement-based material according to claim 1, characterized in that, At least one of the sliding rods is respectively arranged on two opposite sides of the loading frame, and an ear plate is connected to the loading frame at a position corresponding to the position of the sliding rod, and the ear plate is slidably sleeved on the sliding rod.

3. The testing device for the interfacial mechanical properties of a metal-cement-based material according to claim 1, characterized in that, The end plate includes a first end plate and a second end plate, the first end plate and the second end plate are arranged opposite to each other, the fixed end of the normal actuator is connected to the first end plate, and the loading end faces the loading frame, the second end plate is located on the side of the groove away from the loading frame, one end of the fastening member is connected to the second end plate, and the other end is connected to the outer side of the bottom of the groove, the cross bar is arranged between the first end plate and the second end plate, and the two ends are respectively connected to the first end plate and the second end plate.

4. The testing device for the interfacial mechanical properties of a metal-cement-based material according to claim 3, characterized in that, A plurality of the cross bars are arranged on the periphery of the normal actuator.

5. The testing device for the interfacial mechanical properties of a metal-cement-based material according to claim 1, characterized in that, An adjusting piece is detachably connected to the groove bottom of the groove, the length of the adjusting piece protruding from the groove bottom of the groove is adjustable, and a plurality of the adjusting pieces are symmetrically distributed about the center of the groove.

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