CN111238964A - Metal-cement-based material interface mechanical property testing device - Google Patents

Abstract

The invention relates to the technical field of structural engineering, and discloses a metal-cement-based material interface mechanical property testing device which comprises a supporting assembly, a loading frame and a tangential actuator, wherein a groove with a notch facing one side is formed in the supporting assembly, the loading frame is of a hollow structure with openings at two sides, the sizes of the groove and the loading frame are matched with a test piece, and the tangential actuator is fixedly arranged above one side of the notch of the groove. According to the metal-cement-based material interface mechanical property testing device provided by the invention, the loading frame is matched with the groove, so that the force can be conveniently applied to the loading frame to test the tangential shear resistance of the testing piece, and meanwhile, the groove and the loading frame can play a role in restraining the testing piece at the periphery of the testing piece, so that the lateral deformation of the testing piece in the testing process can be avoided, the influence of the geometric deformation of the testing piece on the mechanical property is further reduced, and the stable and accurate mechanical property result can be obtained.

Description

Metal-cement-based material interface mechanical property testing device

technical field

The invention relates to the technical field of structural engineering, in particular to a metal-cement-based material interface mechanical property testing device.

Background technique

Steel and concrete are currently the two largest engineering structural materials. Steel-concrete composite structure generally refers to a structure that is composed of steel and concrete, and the two work together, such as steel-concrete composite beam, steel tube concrete, section steel concrete, etc. The composite structure has the characteristics of good mechanical properties and convenient construction, and has been widely used in long-span, bridge and high-rise structures.

In the process of component stress, it is necessary to ensure that the steel and concrete materials of the composite structure work together, and it is necessary to ensure that the force transmission of the two is reliable. For components with shear connectors, push-out tests are generally used to determine the shear resistance of the interface. For some components without shear connectors, clarifying the interface bond-slip properties between steel and concrete is the basis for ensuring reliable internal force transmission between the two materials.

At present, there are the following problems in the testing of interface mechanical properties of steel and concrete: because the tangential shear resistance of steel and concrete interface is greatly affected by the geometric deformation of components, it is difficult to obtain stable interface mechanical properties results.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a metal-cement-based material interface mechanical performance testing device, which is used to solve or partially solve the problem that it is difficult to obtain stable interface mechanical performance results in the current steel-concrete interface mechanical performance test.

An embodiment of the present invention provides a metal-cement-based material interface mechanical property testing device, including 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 It is a hollow structure with openings on both sides, the dimensions of the groove and the loading frame are matched with the test piece, and the tangential actuator is fixedly arranged above the side of the notch of the groove.

On the basis of the above solution, a vertically arranged guide structure is also included, the first side of the loading frame is connected to the notch of the groove, and the loading frame is movably connected to the guide structure.

On the basis of the above solution, the guide structure includes a vertically arranged sliding rod, at least one sliding rod is respectively provided on opposite sides of the loading frame, and ears are connected to the loading frame corresponding to the position of the sliding rod The lug plate is slidably sleeved on the sliding rod.

On the basis of the above solution, a normal loading assembly is further included, and the normal loading assembly includes a normal actuator, and the normal actuator is arranged on the second side of the loading frame.

On the basis of the above solution, the normal loading assembly further includes a first end plate, a second end plate, a pressing member and a cross bar, the first end plate and the second end plate are disposed opposite to each other, and the normal direction The fixed end of the actuator is connected to the first end plate, the loading end faces the loading frame, the second end plate is located on the side of the groove away from the loading frame, and one end of the abutting member Connected to the second end plate, the other end is connected to the outer side of the groove 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 with the first end plate. One end plate and the second end plate are connected correspondingly.

On the basis of the above solution, a plurality of the transverse rods are arranged on the periphery of the normal actuator.

On the basis of the above solution, a plate-shaped sliding structure is connected to the loading end of the normal actuator.

On the basis of the above solution, an adjusting piece is detachably connected to the bottom of the groove, the length of the adjusting piece protruding from the bottom of the groove can be adjusted, and a plurality of the adjusting pieces are related to the The center of the grooves is symmetrically distributed.

Based on the above solution, the support assembly includes a base and a panel, the panel is vertically connected to the base, and the groove is provided on one side of the panel.

On the basis of the above solution, the other side of the panel is vertically connected with a reinforcing rib.

The embodiment of the present invention provides a device for testing the mechanical properties of a metal-cement-based material interface. The loading frame and the groove are arranged to cooperate with each other, which can facilitate the application of force on the loading frame to test the tangential shear performance of the test piece, and at the same time, the groove And the loading frame on the periphery of the test piece can restrain it, which can avoid the lateral deformation of the test piece during the test process, thereby reducing the influence of the geometric deformation of the test piece on the mechanical properties, which is beneficial to obtain stable and accurate mechanical performance results.

Description of drawings

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 accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is an overall schematic diagram of a metal-cement-based material interface mechanical property testing device according to an embodiment of the present invention;

Fig. 2 is the first schematic diagram of the setting of the loading frame and the sliding rod in the embodiment of the present invention;

3 is a second schematic diagram of the setting of the loading frame and the sliding rod in the embodiment of the present invention;

4 is a schematic structural diagram of a normal loading assembly in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a support assembly in an embodiment of the present invention.

Description of reference numbers:

Among them, 1-support assembly; 101-base; 102-panel; 103-reinforced rib; 104-groove; 105-threaded hole; 2-slider rod; 201-loading frame; 202-slide rod; 203-ear plate ; 3-normal loading assembly; 301-first end plate; 302-cross rod; 303-nut; 304-second end plate; 305-normal actuator; 4- Tangential actuator.

Detailed ways

In order to make the purposes, 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. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

An embodiment of the present invention provides a metal-cement-based material interface mechanical property testing device. Referring to FIG. 1 , the mechanical property testing device includes a support assembly 1 , a loading frame 201 and a tangential actuator 4 , and the support assembly 1 has a notch. Facing the groove 104 on one side, the loading frame 201 is a hollow structure with openings on both sides, the size of the groove 104 and the loading frame 201 match the test piece, and the tangential actuator 4 is fixedly arranged in the notch of the groove 104 top of one side.

When testing the mechanical properties of the test piece, the test piece can be placed in the loading frame 201 , the loading frame 201 can be placed on the notch side of the groove 104 , and one side of the test piece can be 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 above the loading frame 201 . So that the tangential actuator 4 can exert downward force on the loading frame 201, and then the mechanical property test of the test piece is performed.

In a metal-cement-based material interface mechanical property testing device provided in this embodiment, the loading frame 201 is arranged to cooperate with the groove 104, which can facilitate the application of force on the loading frame 201 to test the tangential shear performance of the test piece, and at the same time The groove 104 and the loading frame 201 on the periphery of the test piece can act as a constraint on it, which can avoid the lateral deformation of the test piece during the test process, thereby reducing the influence of the geometric deformation of the test piece on the mechanical properties, which is conducive to obtaining a stable and accurate test piece. Mechanical properties results.

Further, a metal-cement-based material interface mechanical property testing device provided in this embodiment can be used to test the tangential shear resistance of the steel-concrete interface. Because the tangential shear resistance of the interface between steel and concrete is greatly affected by the geometric deformation of the components, the existing general test devices have no constraints on the lateral deformation, and it is difficult to obtain stable interface mechanical performance results. The mechanical property testing device provided in this embodiment is provided with grooves 104 and loading frame 201 to constrain the test piece, which is beneficial to avoid component deformation and obtain more stable mechanical property results.

Further, when the mechanical property testing device is used to test the tangential shear resistance of the steel-concrete interface, 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 of steel concrete.

Further, the mechanical property testing device can also be used to test the mechanical properties of aluminum-concrete interfaces, etc. The device can measure the interface properties of any metal-cement-based material or other materials, which is not specifically limited.

On the basis of the above embodiment, a mechanical property testing device further includes a vertically arranged guide structure, the first side of the loading frame 201 is connected to the notch of the groove 104, and the loading frame 201 and the guide structure can be connected to each other. Mobile connection. The loading frame 201 is movable along the guide structure. The guiding structure is connected to the loading frame 201, which can limit the movement path of the loading frame 201 during the test process, so that when the test piece reaches the mechanical limit, the loading frame 201 and some test pieces inside move along the guiding structure, that is, along the tangential direction Mobile, which improves the stability and accuracy of the test.

On the basis of the above-mentioned embodiment, further, referring to FIG. 2 and FIG. 3 , the guide structure includes a vertically arranged sliding rod 202 , and at least one sliding rod 202 is respectively provided on the opposite sides of the loading frame 201 . The loading frame 201 and the sliding rod 202 An ear plate 203 is connected to the corresponding position, and the ear plate 203 is slidably sleeved on the sliding rod 202 . The loading frame 201 can move up and down along the sliding rod 202, thereby limiting the movement path of the loading frame 201.

Preferably, sliding rods 202 are respectively provided on opposite sides of the loading frame 201 adjacent to the first side. The loading frame 201 is connected to the sliding rods 202 on opposite sides respectively, which can also prevent the loading frame 201 from being horizontally displaced and affecting the stability of the test.

On the basis of the above-mentioned embodiment, further, referring to FIG. 4 , a mechanical performance testing device further includes a normal loading assembly 3, and the normal loading assembly 3 includes a normal actuator 305, and the normal actuator 305 is located in the The second side of the frame 201 is loaded. The second side of the loading frame 201 is the side opposite to the first side. Because the normal force also has a relatively large influence on the shear resistance, in this embodiment, the normal force loading component 3 is set in the test device considering the influence of the normal force before and after the interface moves. The normal actuator 305 can apply a normal force to the test piece, so as to control the normal force of the test piece during the test, and improve the stability of the tangential shear resistance test of the test piece.

On the basis of the above embodiment, the normal loading assembly 3 further includes a first end plate 301 , a second end plate 304 , a pressing member 306 and a cross bar 302 , the first end plate 301 and the second end plate 304 Oppositely arranged, the fixed end of the normal actuator 305 is connected to the first end plate 301 , 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 , and one end of the abutting member 306 It is connected to the second end plate 304 and the other end is connected to the outer side of the groove bottom of the groove 104 . The second end plates 304 are connected correspondingly.

The normal loading assembly 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 opposite to each other, the side of the first end plate 301 facing the second end plate 304 is connected to the fixed end of the normal actuator 305, and the loading end of the normal actuator 305 is facing the first end plate 305. The two end plates 304 and the second end plate 304 are connected to one end of the abutting member 306 toward the side of the first end plate 301; The rods 302 are connected and fixed.

When testing the mechanical properties of the test piece, the normal loading assembly 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 loading frame 201 away from the groove 104. One side of the groove 104 is away from the loading frame 201 ; and the other end of the abutting member 306 away from the second end plate 304 is in contact with the outer side of the groove bottom of the groove 104 . The loading end of the normal actuator 305 is connected to the second side of the loading frame 201 , and applies a normal force to the test piece in the loading frame 201 .

When the normal actuator 305 exerts force on the test piece, the loading end of the normal actuator 305 presses against the test piece, and at the same time the other end of the pressing piece 306 presses against the outside of the groove bottom of the groove 104, so that the A stable normal force can be applied to the test piece without installing and fixing the loading assembly 3 . The setting structure of the normal loading assembly 3 makes it unnecessary to install and fix the normal loading assembly 3, which is convenient for the use and disassembly of the normal loading assembly 3, thereby facilitating the installation and disassembly of the test piece, as well as the storage and transportation of the test device and the normal loading assembly 3, etc. .

On the basis of the above embodiment, further, a plurality of transverse bars 302 are arranged on the periphery of the normal actuator 305 . This is beneficial to the stability of the connection between the first end plate 301 and the second end plate 304, and is further beneficial to apply a stable normal force to the test piece. Preferably, a plurality of transverse bars 302 may be uniformly arranged around the normal actuator 305 .

Further, both ends of the cross bar 302 can be connected with the first end plate 301 and the second end plate 304 by screwing, respectively. Both ends of the transverse rod 302 can pass through the first end plate 301 and the second end plate 304 correspondingly, and are connected with nuts 303 on the outside of the first end plate 301 and the second end plate 304 .

On the basis of the above embodiment, 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 active end. The sliding structure 307 may be a sheet of low coefficient of friction material or a rolling drag reducing device. In order to reduce the friction force with the test piece, when the test piece deforms and moves, it is convenient for the test piece to move smoothly and avoid damage to the loading end of the normal actuator 305 .

The sliding structure 307 is in the shape of a plate, which is convenient for contacting the test piece to exert force. The side of the sliding structure 307 facing the test piece can be provided with rollers or balls. In order to facilitate the relative movement between the test piece and the sliding structure 307 .

On the basis of the above-mentioned embodiment, further, referring to FIG. 5 , an adjusting member is detachably connected to the bottom of the groove 104 , and the length of the adjusting member protruding from the bottom of the groove 104 is adjustable, and several adjusting members are related to The centers of the grooves 104 are symmetrically distributed. By adjusting the length of the adjusting piece protruding from the groove bottom of the groove 104, the depth of the groove 104 for accommodating the test piece can be adjusted, so that the groove 104 can be adapted to test pieces of different thicknesses, improving the applicability of the test device and the flexibility.

Further, the adjustment member may be a bolt. A threaded hole 105 can be provided on the groove bottom of the groove 104 to be connected with the bolt, and the length of the bolt protruding from the groove bottom of the groove 104 can be adjusted by adjusting the length of the bolt screwed into the threaded hole 105 . The plurality of adjustment pieces are symmetrically distributed with respect to the center of the groove 104, which can support the test piece uniformly and stably, and improve the stability of the mechanical performance test.

On the basis of the above embodiment, the support assembly 1 further 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 .

On the basis of the above embodiment, further, the other side of the panel 102 is vertically connected with a reinforcing rib 103 .

On the basis of the above-mentioned embodiment, this embodiment further proposes a test device for mechanical properties of steel-concrete interface with high stability and considering the influence of normal force before and after interface sliding. The steel-concrete interface mechanical performance test device includes a plurality of components; the components include a support component 1, a slider sliding 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 reinforcement The rib 103 has a groove 104 on the panel 102 ; the panel 102 and the bottom of the reinforcing rib 103 are connected to the base 101 . The slider sliding rod 2 includes a loading frame 201, a lug plate 203, and a sliding rod 202; the loading frame 201 is connected with the lug plate 203, the lug plate 203 has a hole, the lug plate 203 slides up and down along the axis of the sliding rod 202, and the sliding rod 202 is vertically connected with the base 101 . The normal loading assembly 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 plate is connected to the normal actuator 305, and the nut 303 is located at the end Outside the plate, the abutting member 306 is located between the end plate 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 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 .

Wherein, the ear plate 203 is located outside the loading frame 201 . The crossbar 302 is located outside the normal actuator 305 . The number of the horizontal bars 302 may be four or more. It should be particularly noted that the number and distribution of the cross bars 302 in this embodiment are only for illustration, and those skilled in the art can set them according to actual needs.

The sliding structure 307 may be a sheet of low coefficient of friction material or a rolling drag reducing device. Among them, the support assembly 1 (including the base 101, the panel 102 and the reinforcing rib plate 103), the slider sliding rod 2 (including the loading frame 201, the ear plate 203 and the sliding rod 202), the end plate (including the first end plate 301 and the second end plate 301) The plate 304), the cross bar 302, the nut 303 and the abutting member 306 are all made of ordinary steel, high-strength steel, refractory weathering steel or stainless steel.

The steel-concrete interface mechanical performance test device provided in this embodiment can ensure the relative movement of the steel and concrete interface along the tangential direction, provide relatively stable test results, and can reduce the influence of the frictional resistance of the loading device itself.

This embodiment provides a test device for mechanical properties of steel-concrete interface with high stability and considering the influence of normal force before and after interface sliding. It includes a backplane base 101 , a slider rod 2 , a normal loading assembly 3 , and a tangential actuator 4 . On the one hand, the loading frame 201 in the sliding rod 2 assembly can provide sufficient rigidity for concrete loading, and the sliding rod 202 can make the loading frame 201 move in the axial direction to ensure the relative movement of the steel and concrete interface in the tangential direction. Pure shear stress is generated between the interfaces to avoid unstable results caused by bending and shear failure due to minor deformation of components. On the other hand, the normal loading assembly 3 can provide normal stress to the specimen, and the friction coefficient of the sliding structure 307 is small, which can reduce the influence of frictional resistance caused by the normal loading assembly 3 itself.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. A metal-cement-based material interface mechanical property testing device, characterized in that it comprises a support assembly, a loading frame and a tangential actuator, and the support assembly has a groove with a notch toward one side, and the loading The frame is a hollow structure with openings on both sides, the size of the groove and the loading frame are matched with the test piece, and the tangential actuator is fixedly arranged above the side of the notch of the groove. 2 . The metal-cement-based material interface mechanical property testing device according to claim 1 , further comprising a guide structure arranged vertically, and the first side of the loading frame is in contact with the notch of the groove. 3 . connected, the loading frame is movably connected with the guide structure. 3. The metal-cement-based material interface mechanical property testing device according to claim 2, wherein the guide structure comprises a vertically arranged sliding rod, and at least one In the sliding rod, the loading frame is connected with an ear plate corresponding to the position of the sliding rod, and the lug plate is slidably sleeved on the sliding rod. 4. The metal-cement-based material interface mechanical property testing device according to claim 2 or 3, further comprising a normal loading component, the normal loading component comprising a normal actuator, the normal loading The actuator is arranged on the second side of the loading frame. 5. The metal-cement-based material interface mechanical property testing device according to claim 4, wherein the normal loading assembly further comprises a first end plate, a second end plate, a pressing member and a cross bar, wherein the 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, the loading end faces the loading frame, and the second end plate is located in the concave One side of the groove facing away from the loading frame, one end of the pressing member is connected with the second end plate, and the other end is connected with the outer side of the groove bottom of the groove, and the cross bar is arranged on the first end plate. The end plate and the second end plate are respectively connected with the first end plate and the second end plate correspondingly at both ends. 6 . The device for testing the mechanical properties of the metal-cement based material interface according to claim 5 , wherein a plurality of the transverse bars are arranged on the periphery of the normal actuator. 7 . 7 . The metal-cement-based material interface mechanical property testing device according to claim 5 , wherein a plate-shaped sliding structure is connected to the loading end of the normal actuator. 8 . 8. The metal-cement-based material interface mechanical property testing device according to any one of claims 1 to 3, wherein the bottom of the groove is detachably connected with an adjusting member, and the adjusting member protrudes from the bottom of the groove. The length of the groove bottom of the groove is adjustable, and a plurality of the adjusting members are symmetrically distributed with respect to the center of the groove. 9. The metal-cement-based material interface mechanical property testing device according to any one of claims 1 to 3, wherein the support assembly comprises a base and a panel, the panel is vertically connected to the base, and the concave The groove is arranged on one side of the panel. 10 . The metal-cement based material interface mechanical property testing device according to claim 9 , wherein the other side of the panel is vertically connected with a reinforcing rib. 11 .

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