Column head universal loading device adopting beam end loading in beam-column joint quasi-static test

Abstract

A column head universal loading device adopting beam end loading in a beam-column joint quasi-static test comprises a loading bearing, a length-adjustable supporting rod assembly, an out-of-plane load actuator, a hinged support and a column cap, and the loading bearing is vertically arranged above the column cap. The supporting rod assembly and the out-of-plane load actuator are arranged on the outer side of the loading bearing in the radial direction of the loading bearing, and the end, close to the loading bearing, of the supporting rod assembly and the end, close to the loading bearing, of the out-of-plane load actuator are connected to the outer circumference of the loading bearing in a sliding mode through connecting pieces in the circumferential direction. The ends, away from the loading bearing, of the supporting rod assembly and the out-of-plane load actuator are hinged to the reaction frame or the cross beam or the reaction wall correspondingly, and the bottom of the loading bearing is connected with the top of the column cap through a hinged support. According to the utility model, loading at different angles can be realized, torque generated by loading eccentricity is effectively counteracted, potential safety hazards are avoided, the stability and the reliability of the loading process are ensured, the device is adaptive to loading devices with different sizes, the application range is widened, and the use efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of building structure mechanics test, in particular to a column head universal loading device using beam end loading in a beam-column node quasi-static test. Background Art

[0002] In the field of construction engineering, quasi-static tests on beam-column joints are a standard method for evaluating the seismic performance of structures. Such tests usually use two main loading methods: beam end loading and column end loading. Under the beam end loading method, the node column head needs to be fixed and constrained to form a fixed hinge support. Its fixing device needs to meet certain stiffness and bearing capacity requirements. Therefore, the node column head fixing loading device is the key and core in the quasi-static test of the beam-column joint with beam end loading.

[0003] In the current quasi-static tests of beam-column joints under beam end loading, the node column head fixed loading device lacks a standardized design and fixing method, and the structure is simple and the construction is rough, and the stiffness and bearing capacity cannot be guaranteed. Secondly, when in-plane and out-of-plane loads are applied at the same time, even a small eccentricity will cause a large torque, which will significantly reduce the reliability of the fixed loading device and may cause deviations in the test constraints. Furthermore, due to different test conditions, the traditional node column head fixed loading device cannot adjust the size and loading angle, and can only adapt to fixed-size loading devices, which increases the production cost and leads to low efficiency.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The purpose of the utility model is to address the deficiencies in the prior art and to provide a column head universal loading device that uses beam end loading in a quasi-static test of a beam-column joint. The utility model can achieve loading at different angles, effectively offset the torque generated by loading eccentricity, avoid safety hazards, ensure the stability and reliability of the loading process, adapt to loading devices of different sizes, increase the scope of application, reduce manufacturing costs, and have high efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a universal loading device for column head with beam end loading is used in the quasi-static test of beam-column node, including a loading bearing, a length-adjustable support rod assembly, an out-of-plane load actuator, a hinge support and a column cap, the loading bearing is vertically arranged above the column cap, the support rod assembly and the out-of-plane load actuator are respectively arranged on the outside of the loading bearing along the radial direction of the loading bearing, the support rod assembly and the out-of-plane load actuator are spaced apart in the circumferential direction of the loading bearing, the ends of the support rod assembly and the out-of-plane load actuator close to the loading bearing are respectively connected to the outer circumference of the loading bearing through connecting pieces in a circumferential sliding manner, the ends of the support rod assembly and the out-of-plane load actuator away from the loading bearing are respectively hinged to the reaction frame, beam or reaction wall, and the bottom of the loading bearing is connected to the top of the column cap through a hinge support.

[0007] Based on the above, the support rod assembly includes a plurality of telescopic rods and a box-type force sensor, each telescopic rod is arranged at intervals in the circumferential direction of the loading bearing, the telescopic rod is arranged along the radial direction of the loading bearing, the box-type force sensor is arranged between each telescopic rod and the loading bearing, one end of each telescopic rod close to the loading bearing is hinged to the side of the box-type force sensor away from the loading bearing, the side of the box-type force sensor close to the box-type force sensor is fixedly connected to the connecting piece, and one end of each telescopic rod away from the loading bearing is hinged with a base for connecting to a reaction frame, a beam or a reaction wall.

[0008] Based on the above, the support rod assembly includes a telescopic rod and a box-type force sensor. The telescopic rod is arranged along the radial direction of the loading bearing. The box-type force sensor is arranged between the telescopic rod and the loading bearing. The end of the telescopic rod close to the loading bearing is hinged to the side of the box-type force sensor away from the loading bearing. The side of the box-type force sensor close to the box-type force sensor is fixedly connected to the connecting piece, and the end of the telescopic rod away from the loading bearing is hinged with a base for connecting to a reaction frame, a beam or a reaction wall.

[0009] Based on the above, the telescopic rod includes a support shaft and a connecting shaft, both of which are tubular shafts, the outer diameter of the support shaft is matched with the inner diameter of the connecting shaft, the support shaft and the connecting shaft are coaxial and arranged along the radial direction of the loading bearing, one end of the support shaft close to the loading bearing is inserted into the end of the connecting shaft away from the loading bearing, the end of the connecting shaft close to the loading bearing is hinged to the side of the box-type force sensor away from the loading bearing, the end of the support shaft away from the loading bearing is hinged to the base, the outer circle of the end of the support shaft close to the loading bearing is evenly provided with a plurality of first through holes along the axial direction, the outer circle of the end of the connecting shaft away from the loading bearing is evenly provided with a plurality of second through holes along the axial direction, the corresponding first through holes correspond to the corresponding second through holes and are detachably connected by a first bolt.

[0010] Based on the above, the loading bearing includes an outer ring and an inner ring. The outer ring is coaxially mounted on the outside of the inner ring. A number of rollers arranged in a circumferential array are embedded between the outer ring and the inner ring. The upper and lower sides of the outer circumference of the outer ring are circumferentially provided with annular grooves. The cross-section of the annular groove is T-shaped. The upper and lower ends of the inner ring are integrally formed with end plates. Stiffening ribs are connected between the two end plates. The lower end plate is fixedly connected to the upper movable plate of the hinge support by a number of second bolts, and the lower fixed plate of the hinge support is fixedly connected to the column cap by a number of third bolts.

[0011] Based on the above, the connecting part includes a lateral plate, which is vertically arranged on the outside of the outer ring and tangent to the outer circle of the outer ring. The side of the lateral plate close to the outer ring is an arc-shaped contact surface that matches the outer circle of the outer ring. The arc-shaped contact surface is fully fitted and in sliding contact with the outer circle of the outer ring. The upper and lower sides of the arc-shaped contact surface are fixedly installed with sliding components. The upper sliding component is matched and slidably installed in the upper annular groove, and the lower sliding component is matched and slidably installed in the lower annular groove.

[0012] Based on the above, the sliding assembly on the upper side includes two T-shaped sliders, which are fixed on the upper side of the arc-shaped contact surface and are respectively located on the vertical edge portions on both sides of the arc-shaped contact surface. The two T-shaped sliders are matched and slidably installed in the annular groove on the upper side. The upper side of the arc-shaped contact surface is also fixedly installed with a plurality of T-shaped shafts located between the two T-shaped sliders and arranged at intervals. The T-shaped shafts are matched and slidably arranged in the annular groove on the upper side. Rollers are rotatably installed on the upper and lower ends of the head of the T-shaped shaft, and the rollers are rollingly arranged in the annular groove on the upper side.

[0013] Based on the above, the arc-shaped contact surface is covered and fixedly provided with a rubber layer which is fully fitted with and in sliding contact with the outer circle of the outer ring.

[0014] Based on the above, the box-type force sensor includes a box-type steel component and a force sensor. The force sensor is arranged in the box-type steel component. The side of the box-type steel component away from the loading bearing is hinged to the end of the connecting shaft close to the loading bearing. The side of the box-type steel component close to the loading bearing is fixedly connected to the side of the corresponding side plate away from the loading bearing.

[0015] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the beneficial effects of the utility model are:

[0016] One end of the support rod assembly and the out-of-plane load actuator of the utility model are connected to the outer circumference of the loading bearing through a connecting piece in a circumferential sliding manner, and the other ends of the support rod assembly and the out-of-plane load actuator are respectively hinged to the reaction frame, beam or reaction wall, and the bottom of the loading bearing is connected to the top of the column cap through a hinge support. By adjusting the connection position of the support rod assembly and the out-of-plane load actuator on the loading bearing according to the test conditions, loading at different angles can be achieved, thereby achieving the purpose of universal loading.

[0017] Furthermore, since a small distance eccentricity between the support rod assembly and the out-of-plane load actuator will cause a large torque, a plurality of rollers for rolling are arranged between the inner ring and the outer ring of the loading bearing of the utility model. At the same time, the rollers on the arc-shaped contact surface of the side plate are arranged to roll in the annular groove on the outer ring of the loading bearing. The arrangement of the rollers and the rollers can effectively offset the torque generated by the above-mentioned eccentricity, avoid safety hazards, and ensure the stability and reliability of the loading process.

[0018] Furthermore, the arc-shaped contact surface is covered with a fixed rubber layer that fully fits and slides in contact with the outer circle of the outer ring, and can effectively contact the outer circumferential surface of the outer ring of the loading bearing, ensuring force transmission between the support rod assembly and the out-of-plane load actuator and the loading bearing.

[0019] Further, the support rod assembly includes a telescopic rod and a box-type force sensor, the telescopic rod includes a support shaft and a connecting shaft, one end of the support shaft is coaxially inserted into one end of the connecting shaft, the first through hole on the support shaft corresponds to the second through hole on the connecting shaft and is detachably connected by a first bolt, so that the support shaft and the connecting shaft are detachable and adjustable, the other end of the connecting shaft is hinged with the box-type force sensor, the box-type force sensor is fixedly connected to a connecting piece that slides with the outer ring of the loading bearing, and the other end of the support shaft is hinged with a base for connecting a reaction frame, a beam or a reaction wall, so that the telescopic rod can adjust the length size according to the test conditions, adapt to loading devices of different sizes, improve the scope of application, reduce the manufacturing cost, and have high use efficiency, and the hinged connection method can realize the rotation of the telescopic rod at an adjustable angle in the plane, meet the test conditions of different angle requirements, and further improve the scope of application. Further, the upper and lower ends of the inner ring are integrally formed with end plates, and stiffening ribs are connected between the two end plates, which can effectively improve the stiffness and bearing capacity of the loading bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axonometric drawing of the utility model.

[0021] Figure 2 It is an exploded view of the overall structure of the utility model.

[0022] Figure 3 It is a structural explosion diagram of the support rod assembly of the utility model.

[0023] Figure 4 It is a structural schematic diagram of the connecting piece of the utility model.

[0024] Figure 5 It is a schematic diagram of the connection between the connecting piece and the loading bearing of the utility model.

[0025] Figure 6It is a cross-sectional view of the connection structure of the loading bearing and the hinge support of the utility model.

[0026] In the figure: 1. Support rod assembly; 1-1. Base; 1-2. Support shaft; 1-3. Connecting shaft; 1-4. Box-type force sensor; 1-5. Connecting piece; 1-5-1. Roller; 1-5-2. Lateral plate; 1-5-3. Arc contact surface; 2. Out-of-plane load actuator; 3. Loading bearing; 3-1. Outer ring; 3-1-1. Annular groove; 3-2. Roller; 3-3. Inner ring; 3-4. Stiffening rib; 4. Hinge support; 4-1. Second bolt; 5. Column cap. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0028] like Figure 1-6 As shown, a universal loading device for column head with beam end loading is used in the quasi-static test of beam-column joint, comprising a loading bearing 3, a length-adjustable support rod assembly 1, an out-of-plane load actuator 2, a hinge support 4 and a column cap 5. The loading bearing 3 is vertically arranged above the column cap 5, the support rod assembly 1 and the out-of-plane load actuator 2 are respectively arranged on the outside of the loading bearing 3 along the radial direction of the loading bearing 3, the support rod assembly 1 and the out-of-plane load actuator 2 are spaced apart in the circumferential direction of the loading bearing 3, the ends of the support rod assembly 1 and the out-of-plane load actuator 2 close to the loading bearing 3 are respectively connected to the outer circumference of the loading bearing 3 through connecting pieces 1-5 along the circumferential sliding direction, the ends of the support rod assembly 1 and the out-of-plane load actuator 2 away from the loading bearing 3 are respectively hinged to the reaction frame, beam or reaction wall, and the bottom of the loading bearing 3 is connected to the top of the column cap 5 through the hinge support 4.

[0029] The support rod assembly 1 includes two telescopic rods and a box-type force sensor 1-4. The two telescopic rods are spaced apart in the circumferential direction of the loading bearing 3. The telescopic rods are arranged along the radial direction of the loading bearing 3. The box-type force sensor 1-4 is arranged between each telescopic rod and the loading bearing 3. The end of each telescopic rod close to the loading bearing 3 is hinged to the side of the box-type force sensor 1-4 away from the loading bearing 3. The side of the box-type force sensor 1-4 close to the box-type force sensor 1-4 is fixedly connected to the connecting piece 1-5. The end of each telescopic rod away from the loading bearing 3 is hinged with a base 1-1 for connecting a reaction frame, a beam or a reaction wall. The number of telescopic rods can be specifically determined according to the test plan. Stiffening ribs 3-4 are arranged on the base 1-1 to effectively improve the structural strength of the support rod assembly 1.

[0030] The telescopic rod includes a support shaft 1-2 and a connecting shaft 1-3, both of which are tubular shafts. The outer diameter of the support shaft 1-2 is matched with the inner diameter of the connecting shaft 1-3. The support shaft 1-2 and the connecting shaft 1-3 are coaxial and arranged along the radial direction of the loading bearing 3. The end of the support shaft 1-2 close to the loading bearing 3 is inserted into the end of the connecting shaft 1-3 away from the loading bearing 3. The end of the connecting shaft 1-3 close to the loading bearing 3 is hinged to the side of the box-type force sensor 1-4 away from the loading bearing 3. The end of the support shaft 1-2 away from the loading bearing 3 is hinged to the base 1-1. The outer circle of the end of the support shaft 1-2 close to the loading bearing 3 is evenly provided with a plurality of first through holes along the axial direction. The outer circle of the end of the connecting shaft 1-3 away from the loading bearing 3 is evenly provided with a plurality of second through holes along the axial direction. The corresponding first through holes correspond to the corresponding second through holes and are detachably connected by a first bolt.

[0031] The loading bearing 3 includes an outer ring 3-1 and an inner ring 3-3. The outer ring 3-1 is coaxially sleeved on the outside of the inner ring 3-3. A plurality of rollers 3-2 arranged in a circumferential array are embedded between the outer ring 3-1 and the inner ring 3-3. The upper and lower sides of the outer circumference of the outer ring 3-1 are provided with an annular groove 3-1-1 along the circumferential direction. The cross section of the annular groove 3-1-1 is T-shaped. The upper and lower ends of the inner ring 3-3 are integrally formed with end plates. A stiffening rib 3-4 is connected between the two end plates. The lower end plate is fixedly connected to the upper movable plate of the hinge support 4 by a plurality of second bolts 4-1. The lower fixed plate of the hinge support 4 is fixedly connected to the column cap 5 by a plurality of third bolts. The roller 3-2 can also be a ball.

[0032] The connecting member 1-5 includes a lateral plate 1-5-2, which is vertically arranged on the outside of the outer ring 3-1 and tangent to the outer circle of the outer ring 3-1. The side of the lateral plate 1-5-2 close to the outer ring 3-1 is an arcuate contact surface 1-5-3 adapted to the outer circle of the outer ring 3-1. The arcuate contact surface 1-5-3 is fully fitted and in sliding contact with the outer circle of the outer ring 3-1. The upper and lower sides of the arcuate contact surface 1-5-3 are fixedly installed with sliding components. The upper sliding component is matched and slidably installed in the upper annular groove 3-1-1, and the lower sliding component is matched and slidably installed in the lower annular groove 3-1-1.

[0033] The upper sliding assembly includes two T-shaped sliders, which are fixed on the upper side of the arc contact surface 1-5-3 and are respectively located on the vertical edge portions on both sides of the arc contact surface 1-5-3. The two T-shaped sliders are matched and slidably installed in the upper annular groove 3-1-1. The upper side of the arc contact surface 1-5-3 is also fixedly installed with a plurality of T-shaped shafts located between the two T-shaped sliders and arranged at intervals. The T-shaped shafts are matched and slidably arranged in the upper annular groove 3-1-1. The upper and lower ends of the head of the T-shaped shaft are rotatably installed with rollers 1-5-1, and the rollers 1-5-1 are rollingly arranged in the upper annular groove 3-1-1.

[0034] The arc-shaped contact surface 1-5-3 is covered and fixedly provided with a rubber layer which is fully fitted with and in sliding contact with the outer circle of the outer ring 3-1.

[0035] The box-shaped force sensor 1-4 includes a box-shaped steel member and a force sensor, wherein the force sensor is arranged in the box-shaped steel member, wherein the side of the box-shaped steel member away from the loading bearing 3 is hinged to the end of the connecting shaft 1-3 close to the loading bearing 3, and the side of the box-shaped steel member close to the loading bearing 3 is fixedly connected to the side of the corresponding side plate 1-5-2 away from the loading bearing 3. The box-shaped steel member can also be replaced by an I-shaped steel member or other combined shapes, wherein the ends can be open or closed, and stiffening ribs can be added or not added inside, and a certain number of holes are arranged on the side flanges, and there is no restriction on the spacing, size and shape of the holes, as long as the connection requirements are met.

[0036] The out-of-plane load actuator 2 and the box-type force sensors 1-4 are conventional technologies.

[0037] One end of the support rod assembly 1 and the out-of-plane load actuator 2 of the utility model are connected to the outer circumference of the loading bearing 3 by connecting parts 1-5 in a circumferential sliding manner, and the other ends of the support rod assembly 1 and the out-of-plane load actuator 2 are respectively hinged to the reaction frame, beam or reaction wall, and the bottom of the loading bearing 3 is connected to the top of the column cap 5 through a hinge support 4. By adjusting the connection position of the support rod assembly 1 and the out-of-plane load actuator 2 on the loading bearing 3 according to the test conditions, loading at different angles can be achieved, thereby achieving the purpose of universal loading.

[0038] Furthermore, since a small eccentricity between the support rod assembly 1 and the out-of-plane load actuator 2 will cause a large torque, a plurality of rollers 3-2 for rolling are arranged between the inner ring 3-3 and the outer ring 3-1 of the loading bearing 3 of the utility model. At the same time, the roller 1-5-1 on the arc contact surface 1-5-3 of the lateral plate 1-5-2 is rollingly arranged in the annular groove 3-1-1 on the outer ring 3-1 of the loading bearing 3. The arrangement of the roller 3-2 and the roller 1-5-1 can effectively offset the torque generated by the above-mentioned eccentricity, avoid safety hazards, and ensure the stability and reliability of the loading process.

[0039] Furthermore, the arc-shaped contact surface 1-5-3 is covered and fixedly provided with a rubber layer which fully fits with and is in sliding contact with the outer circle of the outer ring 3-1, and can effectively contact the outer circumferential surface of the outer ring 3-1 of the loading bearing 3, thereby ensuring the force transmission between the support rod assembly 1 and the out-of-plane load actuator 2 and the loading bearing 3.

[0040] Furthermore, the support rod assembly 1 includes a telescopic rod and a box-type force sensor 1-4, the telescopic rod includes a support shaft 1-2 and a connecting shaft 1-3, one end of the support shaft 1-2 is coaxially inserted into one end of the connecting shaft 1-3, the first through hole on the support shaft 1-2 corresponds to the second through hole on the connecting shaft 1-3 and is detachably connected by a first bolt, thereby realizing the detachable and adjustable function of the support shaft 1-2 and the connecting shaft 1-3, the other end of the connecting shaft 1-3 is hinged to the box-type force sensor 1-4, the box-type force sensor 1-4 is fixedly connected to a connecting piece 1-5 that slides with the outer ring 3-1 of the loading bearing 3, and the other end of the support shaft 1-2 is hinged with a base 1-1 for connecting a reaction frame, a beam or a reaction wall, so that the telescopic rod can adjust its length according to the test conditions, adapt to loading devices of different sizes, improve the scope of application, reduce the manufacturing cost, and have high use efficiency, and the hinged connection method can realize the rotation of the telescopic rod at an adjustable angle in the plane, meet the test conditions of different angle requirements, and further improve the scope of application. Furthermore, the upper and lower ends of the inner ring 3 - 3 are integrally formed with end plates, and stiffening ribs 3 - 4 are connected between the two end plates, which can effectively improve the stiffness and bearing capacity of the loaded bearing 3 .

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. In the quasi-static test of beam-column joints, a column head universal loading device with beam end loading is used, which is characterized by: It includes a loading bearing, a length-adjustable support rod assembly, an out-of-plane load actuator, a hinge support and a column cap. The loading bearing is vertically arranged above the column cap. The support rod assembly and the out-of-plane load actuator are respectively arranged on the outside of the loading bearing along the radial direction of the loading bearing. The support rod assembly and the out-of-plane load actuator are spaced apart in the circumferential direction of the loading bearing. The ends of the support rod assembly and the out-of-plane load actuator close to the loading bearing are respectively connected to the outer circumference of the loading bearing through connecting pieces in a circumferential sliding manner. The ends of the support rod assembly and the out-of-plane load actuator away from the loading bearing are respectively hinged to a reaction frame, a beam or a reaction wall. The bottom of the loading bearing is connected to the top of the column cap through a hinge support.

2. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 1 is characterized in that: The support rod assembly includes a plurality of telescopic rods and a box-type force sensor. The telescopic rods are arranged at intervals in the circumferential direction of the loading bearing, and the telescopic rods are arranged along the radial direction of the loading bearing. The box-type force sensor is arranged between each telescopic rod and the loading bearing. One end of each telescopic rod close to the loading bearing is hinged to the side of the box-type force sensor away from the loading bearing. The side of the box-type force sensor close to the box-type force sensor is fixedly connected to the connecting piece, and one end of each telescopic rod away from the loading bearing is hinged with a base for connecting to a reaction frame, a beam or a reaction wall.

3. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 1, characterized in that: The support rod assembly includes a telescopic rod and a box-type force sensor. The telescopic rod is arranged along the radial direction of the loading bearing. The box-type force sensor is arranged between the telescopic rod and the loading bearing. The end of the telescopic rod close to the loading bearing is hinged to the side of the box-type force sensor away from the loading bearing. The side of the box-type force sensor close to the box-type force sensor is fixedly connected to the connecting piece, and the end of the telescopic rod away from the loading bearing is hinged with a base for connecting to a reaction frame, a beam or a reaction wall.

4. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 2 or 3, characterized in that: The telescopic rod includes a supporting shaft and a connecting shaft, both of which are tubular shafts, the outer diameter of the supporting shaft is matched with the inner diameter of the connecting shaft, the supporting shaft and the connecting shaft are coaxial and arranged along the radial direction of the loading bearing, one end of the supporting shaft close to the loading bearing is inserted into the other end of the connecting shaft away from the loading bearing, the end of the connecting shaft close to the loading bearing is hinged to the side of the box-type force sensor away from the loading bearing, the end of the supporting shaft away from the loading bearing is hinged to the base, the outer circle of the end of the supporting shaft close to the loading bearing is evenly provided with a plurality of first through holes along the axial direction, the outer circle of the end of the connecting shaft away from the loading bearing is evenly provided with a plurality of second through holes along the axial direction, the corresponding first through holes correspond to the corresponding second through holes and are detachably connected by a first bolt.

5. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 4, characterized in that: The loading bearing includes an outer ring and an inner ring. The outer ring is coaxially mounted on the outside of the inner ring. A plurality of rollers arranged in a circumferential array are embedded between the outer ring and the inner ring. An annular groove is circumferentially provided on the upper and lower sides of the outer circumference of the outer ring. The cross-section of the annular groove is T-shaped. The upper and lower ends of the inner ring are integrally formed with end plates. Stiffening ribs are connected between the two end plates. The lower end plate is fixedly connected to the upper movable plate of the hinge support by a plurality of second bolts. The lower fixed plate of the hinge support is fixedly connected to the column cap by a plurality of third bolts.

6. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 5, characterized in that: The connecting piece includes a lateral plate, which is vertically arranged on the outside of the outer ring and tangent to the outer circle of the outer ring. The side of the lateral plate close to the outer ring is an arc-shaped contact surface adapted to the outer circle of the outer ring. The arc-shaped contact surface is fully fitted and in sliding contact with the outer circle of the outer ring. The upper and lower sides of the arc-shaped contact surface are fixedly installed with sliding components. The upper sliding component is matched and slidably installed in the upper annular groove, and the lower sliding component is matched and slidably installed in the lower annular groove.

7. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 6, characterized in that: The upper sliding assembly includes two T-shaped sliders, which are fixed on the upper side of the arc-shaped contact surface and are respectively located on the vertical edge portions of both sides of the arc-shaped contact surface. The two T-shaped sliders are matched and slidably installed in the annular groove on the upper side. The upper side of the arc-shaped contact surface is also fixedly installed with a plurality of T-shaped shafts located between the two T-shaped sliders and arranged at intervals. The T-shaped shafts are matched and slidably arranged in the annular groove on the upper side. Rollers are rotatably installed at the upper and lower ends of the head of the T-shaped shaft, and the rollers are rollingly arranged in the annular groove on the upper side.

8. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 6, characterized in that: The arc-shaped contact surface is covered and fixedly provided with a rubber layer which is fully fitted with and in sliding contact with the outer circle of the outer ring.

9. The column head universal loading device using beam end loading in the quasi-static test of beam-column joint according to claim 6, characterized in that: The box-type force sensor includes a box-type steel component and a force sensor. The force sensor is arranged in the box-type steel component. The side of the box-type steel component away from the loading bearing is hinged to the end of the connecting shaft close to the loading bearing. The side of the box-type steel component close to the loading bearing is fixedly connected to the side of the corresponding side plate away from the loading bearing.

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