A punching shear performance test device for reinforced concrete slab components with four sides clamped

Abstract

The present invention provides a shearing performance test device for a reinforced concrete slab component with four sides fixed, including a concrete slab component, the concrete slab component including a concrete flat plate and edge beams on all sides, the edge beams being provided with a plurality of reserved holes; a concrete pier seat being provided at the bottom of the edge beam, the concrete pier seat being provided with a plurality of through holes corresponding to the reserved holes; a structural test room ground beam being used to bear the concrete pier seat, the structural test room ground beam being provided with a plurality of through holes; a connecting assembly fixing the edge beam, the concrete pier seat and the structural test room ground beam together from top to bottom; a load applying device being provided at the lower middle part of the concrete slab component for applying load upward to the concrete slab component. The present invention realizes an easy-to-operate shearing loading scheme for a four-side fixed slab component through a concrete slab component composed of a concrete flat plate and edge beams on all sides, and the tension surface is on the top surface, which is convenient for arranging displacement meters during the test and for observing the crack development process.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical testing devices, in particular to a shearing performance testing device for a reinforced concrete slab component with four sides fixed. Background Art

[0002] Reinforced concrete slab-column structure, i.e. beamless floor structure, has been widely used in shopping malls, offices, underground buildings, etc. due to its flexible layout. However, the shear failure of slab-column structure caused by concentrated load is a brittle failure. Since the chain reaction caused by such failure may lead to continuous collapse of the structure, it is of great significance to conduct experimental work and theoretical research on the shear failure of slab components.

[0003] Currently, due to laboratory conditions, the boundary conditions of plate components under punching loads are mostly set as simply supported structures. Because the plate components are subject to horizontal constraints under the influence of the support boundary, a "membrane effect" occurs. Considering this factor, at this stage, four-sided fixed support components and their fixed loading devices can be used to perform punching tests on plate components with four-sided fixed support boundaries. However, the existing devices of this type are complex in structure, require the prefabrication of a large number of tooling parts, and are generally only applicable to fire or explosion conditions, and are not applicable to concentrated load conditions. Summary of the invention

[0004] The object of the present invention is to provide a punching performance test device for a reinforced concrete slab component with four sides clamped, so as to realize an easy-to-operate punching shear loading scheme for the four-side clamped slab component.

[0005] According to one object of the present invention, the present invention provides a punching shear performance test device for a four-side clamped reinforced concrete slab member, comprising:

[0006] A concrete slab component comprises a concrete slab and side beams located around the concrete slab, wherein the side beams are provided with a plurality of reserved holes;

[0007] A concrete pier seat is arranged at the bottom of the side beam and is used to bear the concrete slab component. The concrete pier seat is provided with a plurality of through holes arranged corresponding to the reserved holes;

[0008] A structural test room ground beam, used to bear the concrete pier, and the structural test room ground beam is provided with a plurality of through holes;

[0009] A connecting assembly is used to fix the side beam, the concrete pier and the ground beam of the structure test room together from top to bottom;

[0010] The load applying device is arranged below the middle part of the concrete slab component and fixed on the ground beam of the structure test room, and is used for applying load upward to the concrete slab component.

[0011] Furthermore, the connecting assembly is a fixing screw, which passes through the side beam, the concrete pier and the structural test laboratory ground beam from top to bottom in sequence, and cooperates with a fixing nut to fix the side beam, the concrete pier and the structural test laboratory ground beam.

[0012] Furthermore, it also includes a fixing steel plate, which is arranged above the side beam, and is provided with a plurality of circular holes corresponding to the reserved holes, and the fixing screw passes through the fixing steel plate to fix the concrete slab component.

[0013] Furthermore, the upper end and the bottom end of the fixing screw are respectively fastened by the fixing nut, and a spring washer is provided between the fixing screw and the fixing nut.

[0014] Furthermore, the fixed steel plate is in the form of a rectangular frame structure with a hollow middle portion, and the area of ​​the rectangular hole groove in the middle portion of the fixed steel plate is not less than the area of ​​the concrete slab.

[0015] Furthermore, the concrete slab and the side beams are integrally formed structures by integral casting.

[0016] Furthermore, the number of the concrete piers is four, and the four concrete piers are respectively arranged at the bottom of the corresponding side beams.

[0017] Furthermore, each of the side beams is fixed to the floor beam of the structural test room by means of no less than two fixing screws.

[0018] Furthermore, the load applying device is a jack.

[0019] Furthermore, the jack is a hydraulic jack or a screw jack.

[0020] The technical solution of the present invention realizes an easy-to-operate shear loading scheme for the four-side fixed-support plate component through a concrete plate component composed of a concrete flat plate and side beams on all sides, and through the connection of the concrete plate component with the ground beam of the structure test room, and the tension-bearing surface is on the top surface, which is convenient for arranging displacement meters during the test and facilitating the observation of the crack development process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods 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 1It is a structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a concrete slab component according to an embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of a concrete slab member according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a fixed steel plate according to an embodiment of the present invention;

[0026] In the figure, 1. Concrete slab; 2. Side beam; 3. Fixing screw; 4. Fixing nut; 5. Jack; 6. Fixing steel plate; 7. Concrete pier; 8. Structural test room ground beam; 9. Rectangular hole groove. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection 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 circumstances.

[0030] Example 1

[0031] like Figure 1-Figure 4 As shown,

[0032] A punching performance test device for a four-side fixed reinforced concrete slab component, comprising a concrete slab component, wherein the concrete slab component comprises a concrete slab 1 and side beams 2 located around the concrete slab 1, wherein the concrete slab 1 and the side beams 2 are integrally formed structures by integral casting, and the side beams 2 are provided with a plurality of reserved holes for fixing screws 3 to pass through;

[0033] The fixing steel plate 6 is arranged above the side beam 2, and is provided with a plurality of circular holes for the fixing screws 3 to pass through, and the circular holes are arranged corresponding to the reserved holes; the fixing steel plate 6 is a rectangular frame structure with a hollow middle portion, and the area of ​​the rectangular hole groove 9 in the middle of the fixing steel plate 6 is not less than the area of ​​the concrete slab. In this embodiment, by designing the middle portion of the fixing steel plate 6 to be open, the fixing steel plate 6 will not interfere with the concrete slab 1 during the test when the jack 5 is loading upward.

[0034] A concrete pier 7 is arranged at the bottom of the side beam 2. The concrete pier 7 is used to support the concrete slab component. The concrete pier 7 is provided with a plurality of through holes for the fixing screws 3 to pass through. The through holes are arranged corresponding to the reserved holes on the side beam 2. There are four concrete piers 7, and the four concrete piers 7 are respectively arranged at the bottom of the corresponding side beams 2.

[0035] The structural test room ground beam 8 is used to bear the concrete pier 7. The structural test room ground beam 8 is provided with a plurality of through holes for the fixing screws 3 to pass through. The bottom end of the fixing screw 3 passes through the upper components and then passes through the through holes on the structural test room ground beam 8, thereby fixing the concrete slab component to the structural test room ground beam 8. In this embodiment, the fixing screw 3 may be fixed in the structural test room ground beam 8 in advance, and the fixing screw 3 passes through the components from bottom to top to fix the concrete slab component to the structural test room ground beam 8.

[0036] The fixing screw 3 penetrates the fixing steel plate 6, the side beam 2, the concrete pier 7 and the structure test room ground beam 8 from top to bottom and fixes the fixing steel plate 6, the side beam 2, the concrete pier 7 and the structure test room ground beam 8 together through the fixing nut 4; the upper end and the bottom end of the fixing screw 3 are respectively fastened by the fixing nut 4, and a spring washer is also provided between the fixing screw 3 and the fixing nut 4. Each side beam 2 is fixed to the structure test room ground beam 8 by no less than two fixing screws 3.

[0037] The jack 5 is arranged below the middle of the concrete slab 1 of the concrete slab component and fixed on the floor beam 8 of the structure test room, and is used to apply load upward to the concrete slab component. The jack used in this embodiment is a hydraulic jack or a screw jack.

[0038] The side beam 2 of the concrete slab component of the present invention is provided with a reserved hole, the side beam 2 is placed on the concrete pier 7, and the reserved hole at the bottom of the side beam 2 is aligned with the through hole on the concrete pier 7; the top of the side beam 2 is pressed by the fixing steel plate 6, and the fixing screw 3 passes through the circular hole on the fixing steel plate 6, and then passes through the reserved hole on the side beam 2, the through hole on the concrete pier 7, and the through hole on the structural test room ground beam 8 in sequence, and is fixed by the fixing nut 4. The jack 5 is fixed on the top of the structural test room ground beam 8, aligned with the center of the concrete slab component, and loaded upward.

[0039] The concrete slab component of the present invention is connected by the side beam 2, the bottom is placed on the concrete pier 7, the top is pressed by the fixed steel plate 6, and finally the fixed screw 3 is penetrated to the structural test room ground beam 8 and locked. The jack 5 should be positioned and fixed on the structural test room ground beam 8 in advance before the component is installed. The size of the side beam 2 of the concrete slab component should be designed and the reserved holes should be set before the template is made, and finally the whole is cast to simulate the four-side fixed support condition.

[0040] The present invention realizes an easy-to-operate four-side fixed-support plate component shear loading scheme through a concrete plate component composed of a concrete flat plate 1 and surrounding edge beams 2, and through the connection of the concrete plate component with the ground beam 8 of the structure test room, and the tension-bearing surface is on the top surface, which is convenient for arranging displacement meters during the test and facilitating the observation of the crack development process.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A punching performance test device for a four-side clamped reinforced concrete slab member, characterized in that: include: The concrete slab component comprises a concrete slab and side beams located around the concrete slab, wherein the side beams are provided with a plurality of reserved holes; the concrete slab and the side beams are integrally formed structures by integral casting; A concrete pier seat is arranged at the bottom of the side beam and is used to bear the concrete slab component. The concrete pier seat is provided with a plurality of through holes arranged corresponding to the reserved holes; A structural test room ground beam, used to bear the concrete pier, and the structural test room ground beam is provided with a plurality of through holes; A connection assembly fixes the side beam, the concrete pier and the structural test room ground beam together from top to bottom; the connection assembly is a fixing screw, which passes through the side beam, the concrete pier and the structural test room ground beam from top to bottom in sequence, and cooperates with a fixing nut to fix the side beam, the concrete pier and the structural test room ground beam; A load applying device is arranged below the middle of the concrete slab member and fixed on the floor beam of the structural test room, and is used to apply a load upward to the concrete slab member; The number of the concrete piers is four, and the four concrete piers are respectively arranged at the bottom of the corresponding side beams; each side beam is fixed to the ground beam of the structural test laboratory by no less than two fixing screws.

2. The punching shear performance test device for four-side clamped reinforced concrete slab members according to claim 1, characterized in that: It also includes a fixing steel plate, which is arranged above the side beam. The fixing steel plate is provided with a plurality of circular holes corresponding to the reserved holes. The fixing screws penetrate through the fixing steel plate to fix the concrete slab component.

3. The punching shear performance test device for four-side clamped reinforced concrete slab members according to claim 1, characterized in that: The upper end and the lower end of the fixing screw are respectively fastened by the fixing nuts, and a spring washer is provided between the fixing screw and the fixing nut.

4. The punching shear performance test device for a four-side clamped reinforced concrete slab member according to claim 2, characterized in that: The fixed steel plate is in the form of a rectangular frame structure with a hollow middle portion, and the area of ​​the rectangular hole groove in the middle portion of the fixed steel plate is not less than the area of ​​the concrete flat plate.

5. The punching shear performance test device for four-side clamped reinforced concrete slab members according to claim 1, characterized in that: The load applying device is a jack.

6. The punching shear performance test device for four-side clamped reinforced concrete slab members according to claim 5, characterized in that: The jack is a hydraulic jack or a screw jack.

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