Column end hinged joint test loading device for limiting out-of-plane deformation

Abstract

The utility model relates to a column end hinged joint test loading device for limiting out-of-plane deformation. The device is suitable for the civil engineering structure test technology field. The technical scheme comprises a support; the fixed hinge support is fixed on the bracket and can be connected with the first end of the column end; the axial pressurizing mechanism is fixed on the bracket, can be connected with the second end of the column end and can provide axial pressure for the column end; the actuator is fixed on the bracket, can be connected with the beam end, and applies acting force or displacement to the beam end; the loading sleeve head can be fixed at the second end of the beam end and is provided with a first supporting surface and a second supporting surface which respectively face a first direction and a second direction, and the first direction and the second direction are opposite and are vertical to the loading direction of the actuator and the axis direction of the beam end; the limiting supporting frame is fixed to the support, and a first pulley block matched with the first supporting face and a second pulley block matched with the second supporting face are installed on the limiting supporting frame.

Description

Technical Field

[0001] The utility model relates to a column end hinged node test loading device for limiting out-of-plane deformation, which is suitable for the field of civil engineering structure testing. Background Art

[0002] Traditional structural node design is usually based on experience and specifications, lacking systematic experimental data support. Therefore, it is of great significance to carry out node performance tests. In recent years, with the development of structural engineering and the application of new materials, beam-column node performance tests have become a hot research topic in the field of civil engineering.

[0003] At present, the traditional node performance test device mainly includes a load device, a support device and a measuring device, wherein the support device is used to provide boundary conditions and support for the specimen to maintain the stability of the specimen and limit the movement of the specimen. The design of the support device needs to take into account the interaction between the node and the surrounding structure, and have a certain stiffness and deformation capacity to ensure accurate simulation of the node force and deformation process.

[0004] However, the support device of the existing node test device is not ideal for limiting the out-of-plane deformation of the node specimen. There are many problems such as insufficient device stiffness, incomplete boundary constraints, inappropriate support methods, friction and slippage. At the same time, the simulation of real engineering boundary conditions and the repeatability requirements of boundary conditions cannot be fully met. The node tests carried out based on the above characteristics often have distorted results. The actual damage phenomenon of the test cannot match the preset goals, and the actual behavior of the specimen cannot be accurately reflected, which leads to deviations in the evaluation and verification of the structural design and the inability to accurately evaluate the performance and reliability of the structure. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in view of the above-mentioned existing problems, a column end hinge node test loading device which limits out-of-plane deformation is provided.

[0006] The technical solution adopted by the utility model is: a column end hinged node test loading device with limited out-of-plane deformation, which is used to perform a loading test on a node specimen, wherein the node specimen comprises a column end and a beam end, wherein the first end of the beam end is fixed to the middle of the column end, and is characterized in that it comprises:

[0007] Bracket;

[0008] A fixed hinge support, fixed on the bracket and capable of being connected to the first end of the column end;

[0009] An axial pressure mechanism, fixed on the bracket, can be connected to the second end of the column end, and can provide axial pressure for the column end;

[0010] an actuator, fixed to the bracket, capable of being connected to the beam end to apply force or displacement to the beam end;

[0011] A loading sleeve, which can be fixed on the second end of the beam end and has a first supporting surface and a second supporting surface facing a first direction and a second direction respectively, wherein the first and second directions are opposite and perpendicular to the loading direction of the actuator and the axial direction of the beam end;

[0012] The position-limiting support frame is fixed on the bracket, and is provided with a first pulley block matched with the first support surface and a second pulley block matched with the second support surface.

[0013] The support comprises an upper crossbeam, a lower crossbeam, a left column and a right column, and the upper crossbeam, the lower crossbeam, the left column and the right column are connected to form a U-shaped frame structure.

[0014] The fixed hinge support includes a first tail end plate and a first head ear plate fixedly connected to the first tail end plate, and the first tail end plate is fixedly connected to the bracket;

[0015] The first end of the column end is provided with a connecting ear plate, and the connecting ear plate can be connected to the first head ear plate via a pin shaft.

[0016] The axial pressure mechanism comprises a jack, a jack seat and a sliding hinge support, wherein the jack seat is fixed on the bracket, the first end of the jack is connected to the jack seat, and the second end of the jack is connected to the sliding hinge support;

[0017] The sliding hinge support includes a second tail end plate and a second head ear plate fixedly connected to the second tail end plate, and the second tail end plate is fixedly connected to the jack;

[0018] The second end of the column end is provided with a connecting ear plate, and the connecting ear plate can be connected to the second head ear plate via a pin shaft.

[0019] The jack pedestal comprises a base and a bearing platform arranged on the base, the bearing platform is connected to the first end of the jack, and a stiffening rib is arranged between the bearing platform and the base.

[0020] The jack stand has a vertical ear plate, on which an oblong hole is formed, and the long axis direction of the oblong hole is parallel to the loading direction of the jack;

[0021] The vertical ear plate is connected to the second head ear plate and the connecting ear plate at the second end of the column end via a pin shaft.

[0022] The loading sleeve has a first supporting plate and a second supporting plate which are parallel to each other, and a third supporting plate and a fourth supporting plate connected between the first supporting plate and the second supporting plate, wherein the first, second, third and fourth supporting plates enclose and form an insertion channel adapted to the beam end;

[0023] Among them, one side surface of the first supporting plate is the first supporting surface, and one side surface of the second supporting plate is the second supporting surface.

[0024] The actuator is connected to the beam end via a loading sleeve.

[0025] The first pulley block has at least three supporting pulleys, the supporting pulleys in the first pulley block are in contact with the first supporting surface, and are connected to the position-limiting supporting frame via a screw rod, and the screw rod is arranged parallel to the first direction;

[0026] The second pulley block has at least three supporting pulleys. The supporting pulleys in the second pulley block are in contact with the second supporting surface and are connected to the position-limiting supporting frame via a screw rod, and the screw rod is arranged parallel to the second direction.

[0027] A test loading method of the column end hinged node test loading device for limiting out-of-plane deformation, characterized by comprising:

[0028] Start the axial pressure mechanism to apply gradually increasing axial pressure to the column end of the node specimen until the test design value is reached and the load is maintained; during the loading process of the axial pressure mechanism, the actuator cylinder is in a free moving state;

[0029] The actuator is started to apply force or displacement to the beam end to start the test loading, and the first and second pulley blocks on the limit support frame are used to limit the node specimen from moving freely in the loading direction.

[0030] The beneficial effects of the utility model are as follows: the utility model effectively limits the out-of-plane deformation of the node specimen by cooperating the first supporting surface and the second supporting surface on the loading sleeve with the first pulley group and the second pulley group on the limit support frame. Compared with the commonly used beam middle support method, the lever arm of the lateral force is significantly increased, thereby improving the lateral support effect.

[0031] The utility model utilizes the larger in-plane rigidity of the frame to effectively resist the out-of-plane deformation of the node specimen, thereby improving the lateral support effect.

[0032] The utility model adopts a lying column arrangement in the middle node specimen, and the column ends are connected by pins, which can accurately simulate the stress condition of the node between the inflection points of the upper and lower columns in the frame structure.

[0033] The utility model adopts a loading method in which a jack and an actuator are linked, which can improve the test accuracy and reduce errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A perspective view of an embodiment.

[0035] Figure 2 Schematic diagram of the structure of the reaction frame in the embodiment.

[0036] Figure 3 It is a schematic diagram of the structure of the node specimen in the embodiment.

[0037] Figure 4 It is a schematic diagram of the structure of the fixed hinge support in the embodiment.

[0038] Figure 5 Schematic diagram of the structure of the sliding hinge support in the embodiment.

[0039] Figure 6 It is a structural schematic diagram of the jack stand in the embodiment.

[0040] Figure 7 It is a schematic diagram of the structure of the loading sleeve in the embodiment.

[0041] Figure 8 Schematic diagram of the connection between the actuator, the loading sleeve and the node specimen in the embodiment.

[0042] Fig. 9 A schematic structural diagram of a position limiting support frame in an embodiment.

[0043] 100. Reaction frame;

[0044] 110, upper beam; 120, lower beam; 130, left column; 140, right column;

[0045] 200, node specimen;

[0046] 210, column end; 220, beam end; 230, connecting ear plate; 240, connecting ear plate pin shaft circular hole;

[0047] 300, fixed hinge support;

[0048] 310, first head ear plate; 320, first tail end plate; 330, first head ear plate pin hole; 340, first bolt hole;

[0049] 400, sliding hinge support; 410, second head ear plate; 420, second tail end plate; 430, second head ear plate pin hole;

[0050] 500, Jack;

[0051] 600, jack stand;

[0052] 610, vertical ear plate; 620, load-bearing platform; 630, base; 640, oblong hole; 650, stiffening rib; 660, base bolt hole;

[0053] 700, loading the sleeve;

[0054] 710, first supporting plate; 720, second supporting plate; 730, third supporting plate; 740, fourth supporting plate; 750, supporting plate bolt hole; 760, tension bolt;

[0055] 800, actuator;

[0056] 900, limit support frame;

[0057] 910, front cross beam; 920, rear cross beam; 930, left cross beam; 940, right cross beam; 950, supporting pulley; 960, connecting through hole; 970, adjusting nut; 980, web stiffening rib. DETAILED DESCRIPTION

[0058] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0059] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0060] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0061] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0063] like Figure 1As shown, this embodiment is a column end hinged node test loading device that limits out-of-plane deformation, which is used to perform a loading test on a node specimen. The node specimen includes a column end and a beam end. During the test, the column end is placed horizontally in the left and right directions, and the beam end is vertical with the lower end of the beam end vertically fixed to the middle of the column end.

[0064] In this example, the test loading device includes a bracket, a fixed hinge support, an axial pressure mechanism, an actuator, a loading sleeve and a limit support frame, wherein the fixed hinge support is fixedly installed on the bracket and connected to the left end of the column end; the axial pressure mechanism is fixed on the bracket and connected to the right end of the column end, and is used to provide axial pressure to the column end.

[0065] In this embodiment, the actuator is arranged horizontally along the left-right direction, with its right end fixed on the bracket and its left end connected to the upper part of the beam end, so as to apply horizontal force or displacement to the beam end.

[0066] In this embodiment, the loading sleeve is fixed to the upper end of the beam end and has a first support surface and a second support surface facing forward and backward respectively. In this embodiment, the limit support frame is fixed to the bracket, and the first pulley block and the second pulley block are installed on it. The first pulley block contacts the first support surface, and the second pulley block contacts the second support surface to limit the movement direction of the loading sleeve and the beam end, so as to limit the deformation of the node specimen out of the plane as much as possible.

[0067] The test loading method of the column end hinged node test loading device based on limiting out-of-plane deformation in this embodiment includes the following steps:

[0068] The axial pressure mechanism is started to apply gradually increasing axial pressure to the column end of the node specimen until the test design value is reached and the load is maintained, thereby achieving the purpose of applying constant column axis pressure to the node specimen; during the loading process of the axial pressure mechanism, the actuator cylinder is in a free moving state to prevent the beam end of the node specimen from being deformed;

[0069] The actuator is started to apply force or displacement to the beam end to start the test loading. The first and second pulley blocks on the limit support frame limit the free movement of the node specimen along the loading direction, effectively limiting the out-of-plane deformation.

[0070] like Figure 2 As shown, in some specific implementations, the bracket adopts a reaction frame, including an upper crossbeam, a lower crossbeam, a left column and a right column, wherein the upper crossbeam and the lower crossbeam are horizontally arranged along the left and right directions, and the upper crossbeam, the lower crossbeam, the left column and the right column are connected to form a U-shaped frame structure.

[0071] In this example, the fixed hinge support is fixed on the left column; the axial pressure mechanism is fixed on the lower crossbeam; the actuator is fixed on the right column; and the limit support frame is fixed on the left column.

[0072] like Figure 3As shown, in some specific embodiments, connecting ear plates are provided at both left and right ends of the column end, and the connecting ear plates are double-ear plates, and circular holes for connecting ear plate pins are opened on the ear plates.

[0073] like Figure 4 As shown, in some specific embodiments, the fixed hinge support includes a first tail end plate and a first head ear plate fixedly connected to the first tail end plate, the first tail end plate is provided with three rows and two columns of first bolt holes for connection, and is connected to the left column of the reaction frame through high-strength bolts; the first head ear plate is a three-ear plate, and a first head ear plate pin circular hole is provided on the ear plate.

[0074] In this example, the fixed hinge support cooperates with the pin shaft circular hole of the first head ear plate and the pin shaft circular hole of the connecting ear plate through the pin shaft to realize the connection between the fixed hinge support and the left end of the column end.

[0075] In some specific embodiments, the axial pressure mechanism includes a jack, a jack pedestal and a sliding hinge support, wherein the jack is coaxially arranged with the column end, the left end of the jack is connected to the connecting ear plate of the right end of the column end via the sliding hinge support, and the right end of the jack is fixed to the bracket via the jack pedestal.

[0076] like Figure 5 As shown, in this embodiment, the sliding hinge support has a second tail end plate and a second head ear plate fixedly connected to the second tail end plate, the second tail end plate is fixedly connected to the left end of the jack, the second head ear plate is a single ear plate, and a second head ear plate pin shaft circular hole is opened on the ear plate.

[0077] In this example, the sliding hinge support is connected to the connecting ear plate at the right end of the column end by matching the pin shaft with the second head ear plate pin shaft circular hole on the sliding hinge support and the connecting ear plate pin shaft circular hole on the connecting ear plate.

[0078] like Figure 6 As shown, in some specific embodiments, the jack stand has a base and a bearing platform arranged on the right side of the base, wherein the base is connected to the lower cross beam of the reaction frame, and the right end of the jack is fixedly connected to the bearing platform.

[0079] In this example, the bearing platform of the jack stand is a vertically arranged extended flange box section, and its stiffness must meet the displacement deformation requirements caused by the jack reaction force.

[0080] The base of the jack pedestal is a horizontally arranged outward flange box section, with several rows of pedestal bolt holes on both sides of the lower flange, connected to the lower crossbeam of the reaction frame by high-strength bolts. The bearing platform of the jack pedestal is connected to the base by stiffening ribs to improve the bending rigidity of the bearing platform.

[0081] In some specific embodiments, a vertical ear plate is provided at the left end of the jack pedestal. The vertical ear plate is a double ear plate. The ear plate is provided with an oblong hole. The long axis direction of the oblong hole is parallel to the loading direction of the jack. In this example, the vertical ear plate, the sliding hinge support and the connecting ear plate at the right end of the column end are connected by the pin shaft, the oblong hole of the vertical ear plate, the second head ear plate pin shaft circular hole on the sliding hinge support and the connecting ear plate pin shaft circular hole on the connecting ear plate. The oblong hole of the vertical ear plate can provide support and limit guide when the jack loads axial pressure on the column end.

[0082] like Figure 7 , 8 As shown, in some specific embodiments, the loading sleeve has a first support plate located at the front side and a second support plate located at the rear side, the first support plate and the second support plate are arranged vertically and parallel to the left and right directions, and the lengths of the first and second support plates in the left and right directions are greater than the loading displacement range of the node specimen.

[0083] In this example, the loading sleeve also has a third support plate located on the left and a fourth support plate located on the right. The third support plate and the fourth support plate are arranged vertically and parallel to the front-to-back direction. The third and fourth support plates are connected between the first and second support plates, and are enclosed with the first and second support plates to form an insertion channel adapted to the beam end.

[0084] In this embodiment, the first and second support plates are connected to the upper halves of the third and fourth support plates, and support plate bolt holes are provided in the lower halves of the third and fourth support plates.

[0085] In this example, the upper part of the beam end is inserted into the insertion channel of the loading sleeve, and the lower parts of the third and fourth supporting plates located on the left and right sides of the beam end are clamped by tension bolts in conjunction with the supporting plate bolt holes of the third and fourth supporting plates to achieve the node specimen beam end.

[0086] In this embodiment, the front side surface of the first support plate is a first support surface matched with the first pulley block, and the front side surface of the second support plate is a second support surface matched with the second pulley block.

[0087] In some specific embodiments, the left end of the actuator is fixedly connected to the loading sleeve through a tension bolt and a nut. The tightening of the tension bolt ensures the close connection between the beam and the actuator, improves the connection stiffness, and reduces the gap error.

[0088] like Fig. 9 As shown, in some specific embodiments, the first pulley group has four supporting pulleys, the rotating shafts of the four supporting pulleys are arranged vertically, the four supporting pulleys are in contact with the first supporting surface, and the four supporting pulleys are matched with adjusting nuts and a limiting supporting frame through screws.

[0089] In this example, the screw is arranged along the front-to-back direction, and the position of the support pulley in the front-to-back direction can be adjusted by cooperating with the adjusting nut of the screw, thereby ensuring that the support pulley is in close contact with the first supporting surface, so that the node specimen does not undergo out-of-plane deformation during loading.

[0090] In this embodiment, the second pulley group has four supporting pulleys, the rotating shafts of the four supporting pulleys are arranged vertically, the four supporting pulleys are in contact with the second supporting surface, and the four supporting pulleys are matched with adjusting nuts and a limiting supporting frame via screw rods.

[0091] In this example, the screw is arranged along the front-to-back direction, and the position of the support pulley in the front-to-back direction can be adjusted by cooperating with the adjusting nut of the screw, thereby ensuring that the support pulley is in close contact with the second supporting surface, so that the node specimen does not undergo out-of-plane deformation during loading.

[0092] In some specific embodiments, the limiting support frame is a horizontally arranged planar frame, consisting of front, rear, left and right cross beams, the left cross beam is welded and connected in the middle of the front and rear cross beams, and the right cross beam is welded and connected at the right ends of the front and rear cross beams.

[0093] In this example, the front, rear, left and right cross beams of the limit support frame are all made of I-section steel, and the webs are all placed horizontally, so as to ensure the support stiffness of the limit support frame in the direction outside the node specimen surface and improve the stability of the device.

[0094] In some specific embodiments, the flanges of the front and rear beams of the position-limiting support frame are provided with connecting holes in the middle of the left and right beams, and the supporting pulley with the screw rod passes through the connecting holes and is fixed with an adjusting nut.

[0095] In some specific embodiments, the front and rear beams of the position-limiting support frame are provided with web stiffening ribs at the junctions with the left and right beams. The web stiffening ribs can prevent the local buckling of the front and rear beams and improve the support rigidity of the system.

[0096] In some specific embodiments, the connection between the limit support frame, the actuator, etc. and the bracket is all high-strength bolt connection. The high-strength bolt connection has the advantages of reliable force transmission and greater rigidity, and is easy to disassemble and can be reused.

[0097] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A column end hinged node test loading device with limited out-of-plane deformation, used for loading test of node specimen, the node specimen comprises a column end and a beam end, the first end of the beam end is fixed to the middle of the column end, characterized in that: include: Bracket; A fixed hinge support, fixed on the bracket and capable of being connected to the first end of the column end; An axial pressure mechanism, fixed on the bracket, can be connected to the second end of the column end, and can provide axial pressure for the column end; an actuator, fixed to the bracket, capable of being connected to the beam end to apply force or displacement to the beam end; A loading sleeve, which can be fixed on the second end of the beam end and has a first supporting surface and a second supporting surface facing a first direction and a second direction respectively, wherein the first and second directions are opposite and perpendicular to the loading direction of the actuator and the axial direction of the beam end; The position-limiting support frame is fixed on the bracket, and is provided with a first pulley block matched with the first support surface and a second pulley block matched with the second support surface.

2. The column end hinged node test loading device with limited out-of-plane deformation according to claim 1 is characterized in that: The support comprises an upper crossbeam, a lower crossbeam, a left column and a right column, and the upper crossbeam, the lower crossbeam, the left column and the right column are connected to form a U-shaped frame structure.

3. The column end hinged node test loading device with limited out-of-plane deformation according to claim 1 is characterized in that: The fixed hinge support includes a first tail end plate and a first head ear plate fixedly connected to the first tail end plate, and the first tail end plate is fixedly connected to the bracket; The first end of the column end is provided with a connecting ear plate, and the connecting ear plate can be connected to the first head ear plate via a pin shaft.

4. The column end hinged node test loading device with limited out-of-plane deformation according to claim 1 is characterized in that: The axial pressure mechanism comprises a jack, a jack seat and a sliding hinge support, wherein the jack seat is fixed on the bracket, the first end of the jack is connected to the jack seat, and the second end of the jack is connected to the sliding hinge support; The sliding hinge support includes a second tail end plate and a second head ear plate fixedly connected to the second tail end plate, and the second tail end plate is fixedly connected to the jack; The second end of the column end is provided with a connecting ear plate, and the connecting ear plate can be connected to the second head ear plate via a pin shaft.

5. The column end hinged node test loading device with limited out-of-plane deformation according to claim 4 is characterized in that: The jack pedestal comprises a base and a bearing platform arranged on the base, the bearing platform is connected to the first end of the jack, and a stiffening rib is arranged between the bearing platform and the base.

6. The column end hinged node test loading device for limiting out-of-plane deformation according to claim 4 or 5, characterized in that: The jack stand has a vertical ear plate, on which an oblong hole is formed, and the long axis direction of the oblong hole is parallel to the loading direction of the jack; The vertical ear plate is connected to the second head ear plate and the connecting ear plate at the second end of the column end via a pin shaft.

7. The column end hinged node test loading device with limited out-of-plane deformation according to claim 1 is characterized in that: The loading sleeve has a first supporting plate and a second supporting plate which are parallel to each other, and a third supporting plate and a fourth supporting plate connected between the first supporting plate and the second supporting plate, wherein the first, second, third and fourth supporting plates enclose and form an insertion channel adapted to the beam end; Among them, one side surface of the first supporting plate is the first supporting surface, and one side surface of the second supporting plate is the second supporting surface.

8. The column end hinged node test loading device with limited out-of-plane deformation according to claim 1 or 7, characterized in that: The actuator is connected to the beam end via a loading sleeve.

9. The column end hinged node test loading device with limited out-of-plane deformation according to claim 1 is characterized in that: The first pulley block has at least three supporting pulleys, the supporting pulleys in the first pulley block are in contact with the first supporting surface, and are connected to the position-limiting supporting frame via a screw rod, and the screw rod is arranged parallel to the first direction; The second pulley block has at least three supporting pulleys. The supporting pulleys in the second pulley block are in contact with the second supporting surface and are connected to the position-limiting supporting frame via a screw rod, and the screw rod is arranged parallel to the second direction.

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