Connecting device for compression-bending-shear experiment of reinforced concrete member and construction method thereof

Abstract

The application relates to a connecting device for compression-bending-shear experiment of a reinforced concrete component and a construction method thereof, wherein the connecting device for compression-bending-shear experiment of the reinforced concrete component comprises upper and lower connecting pieces installed on the upper and lower ends of a concrete component to be tested, the upper and lower connecting pieces are the same and each comprises two half end plates, two half-round-table type hoops, longitudinal stiffening ribs, high-strength bolts and high-strength grouting materials; one side of the two half end plates close to each other is provided with a mortise and tenon structure to realize splicing of the two half end plates to form a complete end plate; one half-round-table type hoop is welded and fixed on each half end plate, wherein the large end of the half-round-table type hoop is welded and fixed with the surface of the half end plate, and the two half-round-table type hoops form a round-table type hoop after splicing of the two half end plates; the application has reasonable design and is favorable for enhancing the connecting effect of the concrete component to be tested and the loading device, so that a consolidation effect is achieved, and the accuracy of the experiment is ensured.

Description

Technical Field

[0001] The invention relates to a connection device for compression, bending and shearing tests of reinforced concrete components and a construction method thereof. Background Art

[0002] Reinforced concrete components are widely used in building structures and bridge structures. With the continuous development of building structure technology, new reinforced concrete components such as high-strength reinforced concrete components, stainless steel reinforced concrete components, prefabricated reinforced concrete components or CFRP-constrained reinforced concrete components are also gradually being used in building structures and bridge structures.

[0003] However, current research on new reinforced concrete components such as high-strength reinforced concrete components, stainless steel reinforced concrete components, prefabricated reinforced concrete components or CFRP-constrained reinforced concrete components mostly focuses on their mechanical properties under the action of pressure, bending moment and torque alone, while there is relatively little research on their performance under complex internal forces of compression, bending and shear. However, in high-rise and super-high-rise buildings, due to the influence of horizontal wind loads or seismic loads, the frame columns will be subject to complex internal forces of compression, bending and shear. However, in compression, bending and shear tests, the new reinforced concrete components cannot be effectively connected to the loading device to achieve the consolidation effect, resulting in the experiment failing to achieve the expected purpose. Summary of the Invention

[0004] In view of the deficiencies of the above-mentioned existing technologies, the purpose of the present invention is to provide a connection device and a construction method for compression, bending and shear tests of reinforced concrete components. The connection device and the construction method for compression, bending and shear tests of reinforced concrete components are reasonably designed, which is conducive to enhancing the connection effect between the concrete component to be tested and the loading device, thereby achieving a consolidation effect to ensure the accuracy of the experiment.

[0005] The connecting device for compression, bending and shear tests of reinforced concrete members of the present invention is characterized by comprising an upper connecting member and a lower connecting member installed on the upper and lower ends of the concrete member to be tested, wherein the upper connecting member and the lower connecting member are identical and both comprise two half end plates, two semi-conical hoops, longitudinal stiffening ribs, high-strength bolts and high-strength grouting material;

[0006] A mortise and tenon structure is provided on one side of the two half end plates that are close to each other, so that the two half end plates can be spliced ​​together to form a complete end plate;

[0007] Each half end plate is welded with a semi-conical clamp, wherein the large end of the semi-conical clamp is welded and fixed to the surface of the half end plate. After the two half end plates are spliced ​​together, the two semi-conical clamps form a conical clamp;

[0008] The two sides of the semi-conical hoop are welded with longitudinal stiffening ribs, and the longitudinal stiffening ribs that fit relatively closely at the joint of the half end plates are provided with openings for high-strength bolts to pass through;

[0009] The upper and lower ends of the concrete component to be tested are in the shape of an inverted truncated cone, that is, the diameter is larger at the part away from the center of the concrete component to be tested. The truncated cone-shaped clamp is placed on the outer periphery of the upper and lower ends of the concrete component to be tested with a gap therebetween, and high-strength grouting material is poured into the gap.

[0010] Preferably, the longitudinal stiffening ribs on the two semiconical hoops are relatively fitted together, and the symmetry center plane of the concrete member to be tested passes through the relatively fitted surfaces of the longitudinal stiffening ribs on the two semiconical hoops.

[0011] Preferably, the mortise and tenon structure comprises a dovetail convex tenon provided on one half end plate and a dovetail concave tenon provided on the other half end plate, and the dovetail convex tenon and the dovetail concave tenon are fixed by mortise and tenon fitting.

[0012] Preferably, the two half end plates are provided with bolt through holes for bolt connection and fixation with the test loading device.

[0013] Preferably, a plurality of stiffening ribs are welded on the outer peripheral surface of the semi-conical clamp and the upper surface of the half end plate.

[0014] Preferably, after the upper and lower ends of the concrete member to be tested are installed with the upper connecting piece and the lower connecting piece, the lower connecting piece is connected to the bottom of the test loading device through a bolt through hole, and the upper connecting piece is connected to the bottom surface of the liftable loading beam of the test loading device through a bolt through hole; a vertical actuator is provided above the loading beam in the test loading device, and a transverse actuator is provided on the side of the loading beam.

[0015] The construction method of the connection device for compression, bending and shear tests of reinforced concrete components of the present invention is characterized by:

[0016] 1) Prefabricate upper and lower connecting parts, and prefabricate half end plates 1, semi-conical hoop 4, longitudinal stiffening ribs 9, stiffening ribs 2 and concrete components to be tested 6 in the factory; cut the half end plates 1 into mortise and tenon structures according to the size and quantity specified in the design drawings so that the two half end plates 1 can be spliced ​​together; set holes 10 in the longitudinal stiffening ribs 9 at the splicing of the half end plates 1 according to the size of the high-strength bolts to facilitate the installation of high-strength bolts 3 during subsequent reinforcement; weld the semi-conical hoop 4 to the corresponding position of the half end plate 1 according to the drawings, and then weld the side of the stiffening rib 2 to the outer circumference of the semi-conical hoop 4, and weld the bottom surface of the stiffening rib 2 to the surface of the half end plate 1 to complete the welding of the half end plates; use dovetail convex tenon and dovetail concave tenon to mortise and tenon to fix the two half end plates together, and use high-strength bolts to connect the two semi-conical hoop;

[0017] 2) Prefabricate a new reinforced concrete component (i.e., the concrete component to be tested 6), and ensure that the upper and lower ends of the prefabricated new reinforced concrete component can be placed in the frustum-shaped clamp;

[0018] 3) Connect the test loading device to the upper and lower connectors, brush the inside of the two semi-conical clamps with release agent, then place the upper and lower ends of the prefabricated new reinforced concrete component into the conical clamps, and then pour the pre-mixed high-strength grouting material 8 into the conical clamps. After pouring, perform maintenance as required;

[0019] 4) After one end of the prefabricated new reinforced concrete component is connected to the test loading device, the entire component is turned over and the other end of the prefabricated new reinforced concrete component is connected to the test loading device. The construction method is the same as above.

[0020] The connection device for compression, bending and shear tests of reinforced concrete components of the present invention has the following advantages: 1) All components are prefabricated in the factory, and no welding work is done on site, which has the advantages of good processing quality, convenient construction and low construction cost; 2) When connecting the two half-end plates, holes are opened on the longitudinal stiffening ribs and connected by high-strength bolts. The longitudinal stiffening ribs here simultaneously increase the shear and bending bearing capacity and have a connection function; 3) The two half-end plates are connected by a mortise and tenon structure to prevent the two half-end plates from detaching during use; 4) The column end (upper part) of the new reinforced concrete component to be prefabricated The upper and lower ends) and the hoop are both truncated cone-shaped, which, together with the high-strength grouting material in the hoop, form a mechanical bite force to ensure that the end boundary of the new reinforced concrete member is always consolidated during the test; 5) High-strength grouting material is used in this member, which has high compressive strength, simple construction, low cost, high fluidity, high self-compactness, and can automatically fill the gap without vibration; 6) The two half end plates are designed to be detachable, which is convenient for reuse when used, reducing economic costs and pollution emissions during the production process, and is in line with the basic concept of sustainable development of civil engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] The central control reset pedal and its combined connection method of the present invention are further described in detail below with reference to the accompanying drawings and specific implementation structures.

[0023] Figure 1 is a top view of a half end plate of the present invention;

[0024] Figure 2 is a front view of a half end plate of the present invention;

[0025] Figure 3 is a top view of the end plate of the present invention;

[0026] Figure 4 It is a front view of the component connection of the present invention;

[0027] Figure 5 1-1 is a cross-sectional view of the present invention;

[0028] Figure 6 is a schematic diagram of a concrete member to be tested according to the present invention;

[0029] Figure 7 is a three-dimensional schematic diagram of the present invention;

[0030] Figure 8 is a three-dimensional diagram of the test loading device of the present invention;

[0031] Explanation of the numbers in the figure: 1-half end plate; 2-stiffening rib; 3-high-strength bolt; 4-semi-conical hoop; 5-mortise and tenon structure; 6-concrete member to be tested; 7-concrete; 8-high-strength grouting material; 9-longitudinal stiffening rib; 10-opening; 11-bolt through hole; A1-test loading device; A2-liftable loading beam; A3-vertical actuator; A4-horizontal actuator. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] The connection device for the compression, bending and shear tests of reinforced concrete components of the present invention comprises an upper connection member and a lower connection member installed on the upper and lower ends of the concrete component 6 to be tested. The upper connection member is identical to the lower connection member, and each of the upper connection member and the lower connection member comprises two half end plates 1, two semi-conical hoop hoops 4, longitudinal stiffening ribs 9, high-strength bolts 3 and high-strength grouting material 8;

[0034] A mortise and tenon structure 5 is provided on one side of the two half end plates that are close to each other, so that the two half end plates can be spliced ​​together to form a complete end plate. The mortise and tenon structure 5 includes a dovetail convex tenon 501 provided on one half end plate and a dovetail concave tenon 502 provided on the other half end plate. The dovetail convex tenon and the dovetail concave tenon are fixed by mortise and tenon cooperation. The dovetail convex tenon 501 and the dovetail concave tenon 502 can be one, two or three, etc.

[0035] A semiconical clamp 4 is welded and fixed on each half end plate 1, wherein the large end of the semiconical clamp is welded and fixed to the surface of the half end plate. After the two half end plates are spliced ​​together, the two semiconical clamps form a conical clamp; longitudinal stiffening ribs 9 are welded and fixed on both sides of the semiconical clamp, and the longitudinal stiffening ribs are provided with openings 10 for the penetration of high-strength bolts 3. The fixation of the two semiconical clamps is achieved by passing the high-strength bolts 3 through the openings 10.

[0036] The upper and lower ends of the concrete member to be tested 6 are in the shape of an inverted truncated cone, that is, the one with the largest diameter (e.g. Figure 6 As shown), the frustum-shaped hoop is placed on the periphery of the upper end and the lower end of the concrete member to be tested with a gap therebetween, and a high-strength grouting material 8 is poured into the gap.

[0037] Preferably, the longitudinal stiffening ribs on the two semiconical hoops are relatively fitted, and the symmetry center plane of the concrete member to be tested passes through the relatively fitted surfaces of the longitudinal stiffening ribs on the two semiconical hoops.

[0038] The two half end plates are both provided with bolt through holes 11 for bolt connection and fixing with the test loading device. The connection with the test loading device is achieved by passing bolts through the bolt through holes 11.

[0039] In order to improve the connection firmness between the semi-conical hoop and the half end plate, a plurality of stiffening ribs 2 are welded to the outer peripheral surface of the semi-conical hoop and the upper surface of the half end plate.

[0040] Among them, after the upper and lower connecting parts are installed on the upper and lower ends of the above-mentioned concrete component to be tested, the lower connecting part is connected to the bottom of the test loading device A1 through a bolt through hole, and the upper connecting part is connected to the bottom surface of the liftable loading beam A2 of the test loading device through a bolt through hole; a vertical actuator A3 is provided above the loading beam in the test loading device, and a horizontal actuator A4 is provided on the side of the loading beam.

[0041] Connection and advantages of various components of the present invention:

[0042] End plate: Two half end plates can be assembled and reused, which reduces costs and conforms to the concept of green development;

[0043] Hoops: To ensure connection reliability and improve the pull-out resistance and end restraint stiffness of the column (concrete component to be tested 6), the hoop is designed to be truncated cone-shaped and welded to the end plate. Therefore, each end plate has a semi-truncated cone-shaped hoop. The truncated cone-shaped hoop, high-strength grouting material and enlarged column ends (truncated cone-shaped upper and lower ends) together enhance the end consolidation effect of the column, improve the pull-out resistance of the column, and ensure that the column end boundary is always consolidated during the entire test.

[0044] Longitudinal stiffening ribs: In order to further improve the rigidity of the column end connection device and prevent the end from being damaged, stiffening ribs are arranged around the clamp. The stiffening ribs are connected to the clamp and the end plate by welding. In addition, in order to ensure the reliable connection of the two half end plates, two longitudinal stiffening ribs are specially arranged at the connection of the two half end plates. The stiffening ribs have holes and are tightly connected with high-strength bolts, thereby making the connection between the two end plates tighter.

[0045] High-strength grouting material: high-strength grouting material is filled in the column end and the frustum-conical clamp. High-strength grouting material has high compressive strength, simple construction, low cost, high fluidity, and high self-compactness. It can automatically fill the gap without vibration, thereby ensuring that the column end and the entire end connection device form a rigid body.

[0046] The column body (or column, concrete component to be tested 6) is prefabricated into a truncated cone shape at both ends to further ensure that the new reinforced concrete component will not be pulled out from the truncated cone-shaped clamp filled with high-strength grouting material during the test.

[0047] The construction method of the connection device for the compression, bending and shear test of reinforced concrete components of the present invention,

[0048] 1) Prefabricate upper and lower connecting parts, and prefabricate half end plates 1, semi-conical hoop 4, longitudinal stiffening ribs 9, stiffening ribs 2 and concrete components to be tested 6 in the factory; cut the half end plates 1 into mortise and tenon structures according to the size and quantity specified in the design drawings so that the two half end plates 1 can be spliced ​​together; set holes 10 in the longitudinal stiffening ribs 9 at the splicing of the half end plates 1 according to the size of the high-strength bolts to facilitate the installation of high-strength bolts 3 during subsequent reinforcement; weld the semi-conical hoop 4 to the corresponding position of the half end plate 1 according to the drawings, and then weld the side of the stiffening rib 2 to the outer circumference of the semi-conical hoop 4, and weld the bottom surface of the stiffening rib 2 to the surface of the half end plate 1 to complete the welding of the half end plates; use dovetail convex tenon and dovetail concave tenon to mortise and tenon to fix the two half end plates together, and use high-strength bolts to connect the two semi-conical hoop;

[0049] 2) Prefabricate a new reinforced concrete component (i.e., the concrete component to be tested 6), and ensure that the upper and lower ends of the prefabricated new reinforced concrete component can be placed in the frustum-shaped clamp;

[0050] 3) Connect the test loading device to the upper and lower connectors, brush the inside of the two semi-conical clamps with release agent, then place the upper and lower ends of the prefabricated new reinforced concrete component into the conical clamps, and then pour the pre-mixed high-strength grouting material 8 into the conical clamps. After pouring, perform maintenance as required;

[0051] 4) After one end of the prefabricated new reinforced concrete component is connected to the test loading device, the entire component is turned over and the other end of the prefabricated new reinforced concrete component is connected to the test loading device. The construction method is the same as above.

[0052] The connection device for compression, bending and shear tests of reinforced concrete components of the present invention has the following advantages: 1) All components are prefabricated in the factory, and no welding work is done on site, which has the advantages of good processing quality, convenient construction and low construction cost; 2) When connecting the two half-end plates, holes are opened on the longitudinal stiffening ribs and connected by high-strength bolts. The longitudinal stiffening ribs here simultaneously increase the shear and bending bearing capacity and have a connection function; 3) The two half-end plates are connected by a mortise and tenon structure to prevent the two half-end plates from detaching during use; 4) The column end (upper part) of the new reinforced concrete component to be prefabricated The upper and lower ends) and the hoop are both truncated cone-shaped, which, together with the high-strength grouting material in the hoop, form a mechanical bite force to ensure that the end boundary of the new reinforced concrete member is always consolidated during the test; 5) High-strength grouting material is used in this member, which has high compressive strength, simple construction, low cost, high fluidity, high self-compactness, and can automatically fill the gap without vibration; 6) The two half end plates are designed to be detachable, which is convenient for reuse when used, reducing economic costs and pollution emissions during the production process, and is in line with the basic concept of sustainable development of civil engineering.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are welcome.

Claims

1. A connection device for compression, bending and shear tests of reinforced concrete components, characterized by: It includes an upper connecting piece and a lower connecting piece installed on the upper and lower ends of the concrete member to be tested, wherein the upper connecting piece is identical to the lower connecting piece and both include two half end plates, two semi-conical hoop clamps, longitudinal stiffening ribs, high-strength bolts and high-strength grouting material; A mortise and tenon structure is provided on one side of the two half end plates that are close to each other, so that the two half end plates can be spliced ​​together to form a complete end plate; Each half end plate is welded with a semi-conical clamp, wherein the large end of the semi-conical clamp is welded and fixed to the surface of the half end plate. After the two half end plates are spliced ​​together, the two semi-conical clamps form a conical clamp; The two sides of the semi-conical hoop are welded with longitudinal stiffening ribs, and the longitudinal stiffening ribs that fit relatively closely at the joint of the half end plates are provided with openings for high-strength bolts to pass through; The upper and lower ends of the concrete member to be tested are in the shape of an inverted truncated cone, that is, the diameter is larger at the part away from the center of the concrete member to be tested. The truncated cone-shaped clamp is placed on the periphery of the upper and lower ends of the concrete member to be tested, and a gap is formed between them. High-strength grouting material is poured into the gap. The longitudinal stiffening ribs on the two semi-conical clamps are relatively fitted together, and the symmetrical center plane of the concrete member to be tested passes through the relatively fitted surfaces of the longitudinal stiffening ribs on the two semi-conical clamps. The mortise and tenon structure includes a dovetail convex tenon provided on one half end plate and a dovetail concave tenon provided on the other half end plate, and the dovetail convex tenon and the dovetail concave tenon are fixed by mortise and tenon matching.

2. The connection device for compression, bending and shear tests of reinforced concrete components according to claim 1, characterized in that: The two half end plates are both provided with bolt through holes for bolt connection and fixation with the test loading device.

3. The connection device for compression, bending and shear tests of reinforced concrete components according to claim 2, characterized in that: A plurality of stiffening ribs are welded on the outer peripheral surface of the semi-conical hoop and the upper surface of the half end plate.

4. The connection device for compression, bending and shear tests of reinforced concrete components according to claim 3, characterized in that: After the upper and lower connecting pieces are installed on the upper and lower ends of the concrete component to be tested, the lower connecting piece is connected to the bottom of the test loading device through a bolt through hole, and the upper connecting piece is connected to the bottom surface of the liftable loading beam of the test loading device through a bolt through hole; a vertical actuator is provided above the loading beam in the test loading device, and a horizontal actuator is provided on the side of the loading beam.

5. A construction method for a connection device for a compression, bending and shear test of a reinforced concrete member according to any one of claims 1 to 4, characterized in that: 1) Prefabricate the upper and lower connectors, prefabricate the half end plate (1), the semi-conical hoop (4), the longitudinal stiffening rib (9), the stiffening rib (2) and the concrete member to be tested (6) in the factory; cut the half end plate (1) into the mortise and tenon structure according to the size and quantity specified in the design drawing so that the two half end plates (1) can be spliced ​​together; set the longitudinal stiffening rib (9) at the splicing point of the half end plate (1) with holes (10) according to the size of the high-strength bolts so that Installation of high-strength bolts (3) during subsequent reinforcement; welding the semi-conical hoop (4) to the corresponding position of the half end plate (1) according to the drawing, then welding the side of the stiffening rib (2) to the outer peripheral surface of the semi-conical hoop (4), and welding the bottom surface of the stiffening rib (2) to the surface of the half end plate (1), completing the welding of the half end plate; using dovetail convex tenon and dovetail concave tenon to connect the two half end plates, and using high-strength bolts to connect the two semi-conical hoop; 2) Prefabricate the concrete component to be tested (6), ensuring that the upper end and the lower end of the concrete component to be tested (6) can be placed in the frustum-shaped clamp; 3) Connect the test loading device to the upper and lower connectors, brush the inside of the two semi-conical hoop with a release agent, then place the upper and lower ends of the concrete component to be tested (6) into the conical hoop, and then pour the high-strength grouting material (8) prepared in advance into the conical hoop. After the pouring is completed, perform curing as required; 4) After one end of the concrete component to be tested (6) is connected to the test loading device, the entire component is turned over and the other end of the concrete component to be tested (6) is connected to the test loading device. The construction method is the same as above.

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