A device for measuring the bearing capacity and deformation of L-shaped longitudinal joints in steel-concrete composite columns

Abstract

This application discloses a device for determining the bearing capacity and deformation of L-shaped longitudinal joints in steel-concrete composite columns. The device includes a pressure gauge, stiffening ribs, an upper bearing plate, tie bolts, a steel column specimen, a dial indicator mounting bracket, and sealing components. The upper and lower bearing plates are connected by tie bolts and, in conjunction with a sealing gasket, achieve a sealed clamping of the steel column specimen. A pressure pump is connected to the lower bearing plate via a pressure pipeline to pressurize the steel column specimen. The pressure gauge monitors the internal pressure, and the dial indicator, mounted on a dial indicator mounting bracket, measures the deformation of the steel column specimen. This application can accurately determine whether the steel plate of the steel column has entered plastic deformation and determine the bearing capacity of the L-shaped longitudinal splice weld by applying pressure in stages and recording pressure and deformation data to plot a load-deformation curve. It features a compact structure, convenient operation, and effectively solves the problem of judging longitudinal joint cracking and plastic deformation of steel plates during the construction of steel-concrete composite columns, providing reliable support for ensuring the quality of engineering construction.

Description

Technical Field

[0001] This application belongs to the field of building materials technology, and specifically relates to a device for measuring the bearing capacity and deformation of L-shaped longitudinal joints in steel-concrete composite columns. Background Technology

[0002] Concrete-filled steel tube columns are widely used in high-rise buildings and bridge projects due to their high load-bearing capacity and good seismic performance. However, during the concrete pouring stage of construction, the steel column wall is prone to lateral deformation due to internal pressure. If the deformation exceeds the elastic limit and enters the plastic stage, it will lead to permanent damage to the steel tube and even cause cracking of the longitudinal splice welds, directly threatening the structural safety.

[0003] Currently, there are significant limitations in the methods for detecting the bearing capacity of longitudinal welds and the deformation of steel plates in concrete-filled steel tube columns. Traditional methods often rely on post-construction sampling or experience-based assessments, which cannot capture deformation trends and weld stress states in real time during construction. This makes it difficult to provide early warnings of plastic deformation risks, potentially leading to safety hazards and economic losses.

[0004] Therefore, developing a specialized device and method to accurately measure the bearing capacity of longitudinal L-shaped splice welds and the deformation of steel plates, and to achieve real-time monitoring and quantitative analysis during construction, is of great significance for ensuring the construction quality of steel-concrete composite structures and preventing engineering accidents. Utility Model Content

[0005] The purpose of this application is to provide a device for measuring the bearing capacity and deformation of L-shaped longitudinal joints in steel-concrete composite columns. This addresses the problem in the background art where the tilt angle of the molding device cannot be changed during casting, making it difficult to accurately control samples with poor flowability, thus affecting the quality of glass molding.

[0006] To achieve the above objectives, this application adopts the following technical solution: A device for measuring the bearing capacity and deformation of an L-shaped longitudinal joint in a steel-concrete composite column, comprising: Upper pressure plate, lower pressure plate, tie bolts, dial indicator mounting bracket, dial indicator, booster pump, pressure gauge, and seals; The upper and lower bearing plates are connected by tie bolts to form a clamping space for fixing the steel column specimen; The upper and lower bearing plates are equipped with sealing elements on the contact surfaces with the steel column specimen; The lower bearing plate is equipped with a pressurization pipe connected to a pressurization pump for pressurizing the steel column specimen; The lower pressure plate is also provided with a pressure gauge mounting screw hole for installing a pressure gauge; The dial indicator mounting bracket is sleeved on the tie bolt and fixed by fasteners, and the dial indicator is installed on the dial indicator mounting bracket.

[0007] In one possible implementation, stiffening ribs are provided on the upper and lower pressure plates, and the stiffening ribs are welded to the pressure plates.

[0008] In one possible implementation, the tie bolt is provided with a fastening nut for adjusting the clamping force between the upper and lower pressure plates.

[0009] In one possible implementation, the dial indicator holder is a ring or frame structure with multiple mounting holes for fixing the dial indicator.

[0010] In one possible implementation, the seal is made of rubber and is embedded in the grooves of the upper and lower pressure plates, with its height being less than the depth of the grooves.

[0011] In one possible implementation, the lower bearing plate is provided with bolt holes for inserting tie bolts.

[0012] In one possible implementation, the pressurization pump is connected to a pressurization pipeline via a valve, which is used to control the pressurization process.

[0013] In one possible implementation, the dial indicator is mounted on a dial indicator holder via a magnetic base, with the indicator rod arranged perpendicularly or diagonally to the surface of the steel column specimen.

[0014] In one possible implementation, the upper and lower bearing plates are rectangular steel plates whose dimensions match the cross-section of the steel column specimen.

[0015] In one possible implementation, a hydraulic orifice is also included, which is used for fluid flow and pressure transmission.

[0016] Compared with the prior art, this application has the following beneficial effects: This application provides a device for measuring the bearing capacity and deformation of L-shaped longitudinal joints in steel-concrete composite columns. The device utilizes an upper and lower pressure plate and tie bolts to form a stable clamping space, adaptable to steel column specimens of different specifications. The sealing element ensures the airtightness of the internal pressurized environment of the steel column specimen, preventing pressure leakage from affecting the test results. The combination of a pressure pump and a pressure gauge enables precise pressure application and real-time monitoring. The dial gauge holder and dial gauge work together to capture deformation data of the steel column specimen from multiple angles. The overall structural design is reasonable, providing fundamental hardware support for the accurate measurement of the bearing capacity and deformation of L-shaped longitudinal joints in steel-concrete composite columns, and solving the problems of loose structure and limited functionality in traditional testing devices.

[0017] In one possible implementation, welding stiffening ribs to the bearing plate can significantly enhance the bending stiffness and deformation resistance of the upper and lower bearing plates, preventing uneven stress on the steel column specimen due to deformation of the bearing plate itself during pressurization, and ensuring that the pressure can be evenly transmitted to the interior of the steel column specimen. At the same time, the symmetrical arrangement of the stiffening ribs further improves the structural stability of the bearing plate, extends the overall service life of the device, and ensures the accuracy of data during long-term testing.

[0018] In one possible implementation, the dial indicator holder with a ring or frame structure can be adapted to steel column specimens with different cross-sectional shapes, improving the versatility of the device; the setting of multiple mounting holes allows for flexible arrangement of dial indicators according to test requirements, enabling simultaneous measurement of deformation at different positions of the steel column specimen, avoiding data bias caused by a single measurement point; at the same time, the thread design of the mounting holes or the setting of welded nuts simplifies the installation and disassembly process of the dial indicator, improving test efficiency.

[0019] In one possible implementation, the rubber seal has good elasticity and sealing performance, which can fit tightly against the end face of the steel column specimen and the pressure plate, effectively preventing leakage of the pressurized medium. The design of the seal height being lower than the groove depth provides space for the seal to deform under pressure, ensuring the sealing effect, while avoiding the seal overflowing out of the groove, which could lead to sealing failure or contamination of the specimen. At the same time, the selection of specific materials allows the seal to be adapted to different pressurized media, expanding the applicability of the device.

[0020] In one possible implementation, the bolt holes on the lower bearing plate provide a stable installation position for the tie bolts, ensuring that the tie bolts can be vertically connected to the upper and lower bearing plates to form a symmetrical clamping space. The optimized design of the bolt hole diameter and surface roughness facilitates the assembly and disassembly of the tie bolts and reduces the difficulty of operation. The countersunk hole design prevents the tie bolt head or nut from protruding from the bottom surface of the lower bearing plate, ensuring that the lower bearing plate can be placed stably, improving the overall stability of the device, and preventing the device from tilting during the test due to uneven bottom surface. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of a device for measuring the bearing capacity and deformation of an L-shaped longitudinal joint in a steel-concrete composite column, provided in this application. Figure 2 A schematic diagram of a pressure plate and a dial indicator mounting bracket provided for this application; Figure 3 This application provides an installation diagram of a device for measuring the bearing capacity and deformation of an L-shaped longitudinal joint in a steel-concrete composite column.

[0022] The attached diagram is labeled as follows: 1. Pressure gauge; 2. Stiffening rib; 3. Upper bearing plate; 4. Tie bolt; 5. Steel column specimen; 6. Dial gauge mounting bracket; 7. Seal; 8. Lower bearing plate; 9. Dial gauge; 10. Fastening nut; 11. Pressure pump; 12. Valve; 13. Pressure pipeline; 14. Bolt hole; 15. Fixture; 16. Mounting bolt hole of the bracket; 17. Pressure gauge mounting screw hole; 18. Hydraulic hole. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, this application discloses a device for measuring the bearing capacity and deformation of an L-shaped longitudinal joint in a steel-concrete composite column. The device may include an upper bearing plate 3, a lower bearing plate 8, tie bolts 4, a dial indicator fixing frame 6, a dial indicator 9, a pressure pump 11, a pressure gauge 1, and a sealing element 7.

[0030] Optionally, both the upper bearing plate 3 and the lower bearing plate 8 are made of Q355 low-carbon alloy steel plate, with a preferred thickness of 15-20mm, to ensure structural rigidity.

[0031] The tie bolt 4 is made of high-strength bolts, preferably M20-M30, and there are 4 bolts in total. They are respectively located at the four corners of the upper bearing plate 3 and the lower bearing plate 8. They are connected by bolts to form a stable clamping space for fixing square or round steel column specimens 5 with a height of 400-800mm.

[0032] Specifically, annular grooves are provided on the side of the upper bearing plate 3 and the lower bearing plate 8 that are in contact with the steel column specimen 5, and the sealing element 7 is embedded in the groove.

[0033] The lower pressure plate 8 has a pressure pipe 13 interface on its side. One end of the pressure pipe 13 is welded and fixed to the interface, and the other end is connected to the pressure pump 11 through a quick connector. The pressure pump 11 is preferably an electric hydraulic pump with a rated working pressure of not less than 30MPa.

[0034] The top surface of the lower pressure plate 8 is also provided with mounting screw holes for pressure gauge 1. The screw hole specifications are matched with the interface of pressure gauge 1, and the accuracy of pressure gauge 1 is further optimized to 0.1MPa to ensure the accuracy of pressure monitoring.

[0035] The dial indicator mounting bracket 6 is preferably a frame structure made of Q235 steel. It has through holes at its four corners that are compatible with the tie bolts 4. After being fitted onto the tie bolts 4, it is locked and positioned by fasteners. The number of dial indicators 9 is preferably 4-6, which are installed on different sides of the dial indicator mounting bracket 6 to achieve multi-directional deformation measurement.

[0036] In this embodiment, a stable clamping space is formed by the cooperation of the upper bearing plate 3, the lower bearing plate 8, and the tie bolt 4, which can accommodate steel column specimens 5 of different specifications. The setting of the sealing element 7 ensures the sealing of the internal pressurized environment of the steel column specimen 5, avoiding pressure leakage from affecting the test results. The combination of the pressure pump 11 and the pressure gauge 1 realizes the precise application and real-time monitoring of pressure. The cooperation of the dial gauge fixing frame 6 and the dial gauge 9 can capture the deformation data of the steel column specimen 5 from multiple directions. The overall structural design is reasonable, providing basic hardware support for the accurate determination of the bearing capacity and deformation of the L-shaped longitudinal joint of the steel tube concrete column, and solving the problems of loose structure and single function of traditional testing devices.

[0037] In one possible embodiment, the upper pressure plate 3 and the lower pressure plate 8 are provided with stiffening ribs 2, which are welded to the pressure plates.

[0038] Stiffening ribs 2 are provided on the bottom surface of the upper bearing plate 3 and the top surface of the lower bearing plate 8. Optionally, the stiffening ribs 2 are made of the same material as the bearing plates, namely Q355 steel.

[0039] The cross-sectional shape of the stiffening rib 2 is preferably a right triangle or a rectangle, wherein the length of the right-angled side of the right triangle stiffening rib 2 is preferably 60-100mm, and the height of the rectangular stiffening rib 2 is preferably 50-80mm and the width is preferably 15-25mm.

[0040] Specifically, the stiffening ribs 2 are connected to the bearing plate by double-sided fillet welds, with the weld height preferably being 8-12mm. The stiffening ribs 2 on the bottom surface of the upper bearing plate 3 are symmetrically distributed along the length and width of the bearing plate, with 2-3 ribs in each direction. The arrangement of the stiffening ribs 2 on the top surface of the lower bearing plate 8 is the same as that of the upper bearing plate 3, and the stiffening ribs 2 are staggered from the tie bolts 4 to avoid mutual interference.

[0041] In this embodiment, by welding stiffening ribs 2 onto the bearing plate, the bending stiffness and deformation resistance of the upper bearing plate 3 and the lower bearing plate 8 can be significantly enhanced, avoiding uneven stress on the steel column specimen 5 due to deformation of the bearing plate itself during pressurization, and ensuring that the pressure can be evenly transmitted to the interior of the steel column specimen 5. At the same time, the symmetrical arrangement of the stiffening ribs 2 further improves the structural stability of the bearing plate, extends the overall service life of the device, and ensures the accuracy of data during long-term testing.

[0042] In one possible embodiment, the tie bolt 4 is provided with a fastening nut 10 for adjusting the clamping force between the upper pressure plate 3 and the lower pressure plate 8.

[0043] The fastening nut 10 is fitted onto the tie bolt 4. Optionally, the fastening nut 10 is made of 45 steel, which has been heat-treated to a hardness of HRC28-32 to improve wear resistance and load-bearing capacity.

[0044] The fastening nut 10 is compatible with the tie bolt 4. Preferably, two fastening nuts 10 are fitted on each tie bolt 4, located above the upper pressure plate 3 and below the lower pressure plate 8, respectively.

[0045] Specifically, when fixing the steel column specimen 5, first tighten the lower fastening nut 10 to fit the bottom surface of the lower bearing plate 8, then place the steel column specimen 5 into the clamping space, cover it with the upper bearing plate 3, and then tighten the upper fastening nut 10. The clamping force between the upper bearing plate 3 and the lower bearing plate 8 can be controlled by adjusting the tightness of the nut.

[0046] Furthermore, a torque wrench can be used to control the tightening torque, so that the clamping force can be maintained at 50-80 N•m, ensuring that the seal 7 can fully fit the end face of the steel column specimen 5. In this embodiment, the fastening nut 10 allows for flexible adjustment of the clamping force between the upper pressure plate 3 and the lower pressure plate 8. This ensures that the sealing element 7 fits tightly against the end face of the steel column specimen 5, guaranteeing the seal during pressurization. It also allows for adjustment of the clamping force according to the height and material characteristics of the steel column specimen 5, preventing specimen displacement due to excessive looseness or damage due to excessive tightness. At the same time, the double nut design effectively prevents the nuts from loosening during pressurization, improving the safety and testing stability of the device.

[0047] In one possible embodiment, the dial indicator holder 6 is a ring or frame structure with multiple mounting holes for fixing the dial indicator 9.

[0048] The dial indicator holder 6 can be either a ring structure or a frame structure. For circular steel column specimens 5, a ring holder is preferred, with an inner diameter 20-30 mm larger than the outer diameter of the steel column specimen 5.

[0049] For the square steel column specimen 5, a rectangular frame structure is preferred, with the inner side length of the frame being 15-25 mm longer than the side length of the steel column specimen 5.

[0050] Specifically, the dial indicator mounting bracket 6 has multiple mounting holes, preferably 4-8, evenly distributed around the circumference of the mounting bracket. The hole diameter is adapted to the dial indicator 9 base. Furthermore, the inner wall of the mounting hole is threaded, so that the dial indicator 9 base can be fixed to the mounting hole with bolts, or nuts can be welded to the mounting hole, which facilitates quick assembly and disassembly of the dial indicator 9.

[0051] In this embodiment, the dial indicator mounting bracket 6 with its ring or frame structure can be adapted to steel column specimens 5 with different cross-sectional shapes, improving the versatility of the device; the setting of multiple mounting holes allows for flexible arrangement of dial indicators 9 according to test requirements, enabling simultaneous measurement of deformation at different positions of the steel column specimen 5, avoiding data bias caused by a single measurement point; at the same time, the thread design of the mounting holes or the setting of welded nuts simplifies the installation and disassembly process of dial indicator 9, improving test efficiency.

[0052] In one possible embodiment, the seal 7 is made of rubber and is embedded in the grooves of the upper pressure plate 3 and the lower pressure plate 8, with its height being less than the depth of the grooves.

[0053] Optionally, the rubber material is further preferably nitrile rubber or fluororubber, wherein nitrile rubber is suitable for scenarios where water is used as the pressurizing medium, and fluororubber is suitable for high-temperature or highly corrosive scenarios where engine oil is used as the pressurizing medium. The Shore hardness of the seal 7 is preferably 50-70 Shore A.

[0054] Specifically, grooves are made on the side of the upper bearing plate 3 and the lower bearing plate 8 that contact the steel column specimen 5. The groove depth is preferably 5-8mm. The height of the sealing element 7 is 1-2mm less than the groove depth. The cross-sectional shape of the sealing element 7 matches the groove and is circular or rectangular. During installation, the sealing element 7 is embedded in the groove, ensuring that the top surface of the sealing element 7 is 1-2mm lower than the contact surface of the bearing plate to prevent the sealing element 7 from overflowing under pressure when pressurized.

[0055] In this embodiment, the rubber seal 7 has good elasticity and sealing performance, and can closely fit the end face of the steel column specimen 5 and the pressure plate, effectively preventing leakage of the pressurized medium. The design of the seal 7 being lower than the groove depth provides space for the seal 7 to deform under pressure, ensuring the sealing effect, and avoids the seal 7 overflowing out of the groove, which could lead to sealing failure or contamination of the specimen. At the same time, the selection of specific materials allows the seal 7 to be adapted to different pressurized media, expanding the applicability of the device.

[0056] In one possible embodiment, the lower bearing plate 8 is provided with bolt holes 14 for inserting tie bolts 4.

[0057] Optionally, the number of bolt holes 14 is the same as the number of tie bolts 4, which is 4. They are located at the four corners of the lower bearing plate 8 and are distributed in a rectangular shape. The length of the diagonal of the rectangle is the same as the length of the diagonal of the bolt holes 14 on the upper bearing plate 3.

[0058] Specifically, the diameter of the bolt hole 14 is 0.5-1mm larger than the nominal diameter of the tie bolt 4 to facilitate the insertion of the tie bolt 4. The inner wall of the bolt hole 14 can be polished, and the surface roughness is preferably Ra1.6-Ra3.2μm to reduce the frictional resistance between the tie bolt 4 and the bolt hole 14.

[0059] Furthermore, a countersunk hole is provided below the bolt hole 14. The diameter of the countersunk hole is 5-10 mm larger than that of the bolt hole 14 and the depth is 3-5 mm. It is used to accommodate the head of the tie bolt 4 or the fastening nut 10 below it, so that the bottom surface of the lower bearing plate 8 remains flat.

[0060] In this embodiment, the bolt hole 14 on the lower bearing plate 8 provides a stable installation position for the tie bolt 4, ensuring that the tie bolt 4 can be vertically connected to the upper bearing plate 3 and the lower bearing plate 8 to form a symmetrical clamping space; the optimized design of the bolt hole 14 diameter and surface roughness facilitates the disassembly and assembly of the tie bolt 4 and reduces the difficulty of operation; the countersunk hole prevents the head of the tie bolt 4 or the nut from protruding from the bottom surface of the lower bearing plate 8, ensuring that the lower bearing plate 8 can be placed stably, improving the overall stability of the device, and preventing the device from tilting during the test due to uneven bottom surface.

[0061] In one possible embodiment, the pressurization pump 11 is connected to the pressurization pipeline 13 via a valve 12, which is used to control the pressurization process.

[0062] Optionally, valve 12 is preferably a gate valve or a ball valve, and the material is more preferably stainless steel to prevent corrosion by the pressurized medium. The nominal pressure of valve 12 is not lower than the rated working pressure of pressurized pump 11 to ensure pressure resistance.

[0063] Specifically, one end of valve 12 is connected to the outlet of pressurizing pump 11 via a thread, and the other end is connected to pressurizing pipeline 13 via welding or quick coupling. During the test, opening valve 12 allows pressurizing pump 11 to deliver pressurizing medium into steel column specimen 5, while closing valve 12 can block the flow of medium and maintain the pressure inside steel column specimen 5.

[0064] Furthermore, a dial or handle is provided on valve 12 to facilitate precise control of the opening degree of valve 12, so as to achieve a slow increase or decrease in pressure and avoid excessive instantaneous stress on steel column specimen 5 caused by sudden pressure changes.

[0065] In this embodiment, the valve 12 enables flexible control of the pressurization process. It can precisely adjust the medium delivery speed during the pressurization stage to ensure pressure is applied in stages, facilitating the recording of deformation data under different pressures. It can also close the valve 12 during the pressure holding stage to maintain stable pressure within the steel column specimen 5, ensuring stable measurement of deformation data. The choice of stainless steel extends the service life of the valve 12, is compatible with various pressurization media, and improves the reliability and durability of the device.

[0066] In one possible embodiment, the dial gauge 9 is mounted on the dial gauge holder 6 via a magnetic base, with the gauge rod arranged perpendicularly or diagonally to the surface of the steel column specimen 5.

[0067] Optionally, the magnetic base has an adsorption force of 50-80N to ensure that it can be firmly adsorbed on the dial indicator holder 6. The magnetic base is equipped with a fine adjustment knob to achieve fine adjustment of the position of the dial indicator 9.

[0068] Specifically, for the midpoint of the geometric plane of the steel column specimen 5, adjust the magnetic base so that the dial indicator 9 rod is perpendicular to the column surface, with a perpendicularity deviation not exceeding 0.5°.

[0069] For the four-sided longitudinal seam positions of steel column specimen 5, adjust the magnetic base so that the dial indicator 9 rod is located on the diagonal line of the cross section of steel column specimen 5, with a diagonal deviation not exceeding 1mm.

[0070] Furthermore, the dial indicator 9 has an accuracy of 0.01 mm and a measuring range of 0-10 mm, ensuring accurate measurement of minute deformations.

[0071] In this embodiment, the installation method of the magnetic base makes the position adjustment of the dial indicator 9 more flexible and convenient, eliminating the need for additional complex installation structures on the dial indicator fixing frame 6 and reducing processing difficulty. The arrangement of the dial indicator 9 rod vertically to the column surface or along the diagonal can accurately capture the deformation of the steel column specimen 5 at different positions. The vertical arrangement can accurately measure the bending deformation of the column surface, while the diagonal arrangement can effectively monitor the tensile or cracking deformation of the longitudinal joint, ensuring the accuracy and relevance of the deformation data and providing a reliable basis for subsequent judgment of the plastic deformation of the steel column and the bearing capacity of the weld.

[0072] In one possible embodiment, the upper bearing plate 3 and the lower bearing plate 8 are rectangular steel plates whose dimensions match the cross-section of the steel column specimen 5.

[0073] Optionally, the length and width of the rectangular steel plate are 50-100 mm larger than the length and width of the cross section of the steel column specimen 5 to ensure that it can completely cover the end face of the steel column specimen 5 and prevent the pressurized medium from leaking from the edge.

[0074] Specifically, for the square steel column specimen 5 with a cross-sectional dimension of 200mm×200mm, the dimensions of the upper bearing plate 3 and the lower bearing plate 8 are further preferably 280mm×280mm.

[0075] For rectangular steel column specimen 5 with a cross-sectional dimension of 150mm×300mm, the preferred size of the bearing plate is 230mm×380mm.

[0076] The four corners of the pressure plate can be rounded with a radius of 5-10mm to prevent personnel from being scratched by sharp corners during operation.

[0077] In this embodiment, the size matching design of the rectangular bearing plate and the cross-section of the steel column specimen 5 ensures that the bearing plate can fully cover the end face of the specimen, so that the pressure is evenly transmitted to the whole specimen and avoids premature damage to the specimen due to local pressure concentration. The design of the bearing plate being slightly larger than the cross-section of the specimen provides sufficient space for the installation of the sealing element 7 and improves the sealing effect. The rounded treatment improves the operational safety of the device, reduces the risk of personnel injury, and makes the testing process safer and more convenient.

[0078] In one possible embodiment, a hydraulic orifice 18 is also included for fluid flow and pressure transmission.

[0079] Optionally, the hydraulic hole 18 is opened at the center of the lower pressure plate 8 or on one side near the center, and the hole diameter is further preferably 8-15mm to ensure smooth flow of liquid medium.

[0080] Specifically, one end of the hydraulic hole 18 is connected to the groove on the top surface of the lower pressure plate 8, and the other end is connected to the interface of the pressurized pipe 13, forming a medium flow channel.

[0081] Furthermore, the inner wall of the hydraulic hole 18 is chrome-plated with a thickness of 5-10μm to enhance the wear resistance and corrosion resistance of the inner wall and prevent impurities in the medium from scratching the inner wall and causing blockage. At the same time, a sealing gasket is installed at the connection between the hydraulic hole 18 and the pressurized pipeline 13 to ensure that there is no leakage of the medium.

[0082] In this embodiment, the hydraulic orifice 18 provides a stable flow and pressure transmission channel for the pressurizing medium, ensuring that the pressure output by the pressurizing pump 11 can be uniformly and efficiently transmitted to the interior of the steel column specimen 5, avoiding pressure loss or uneven pressure distribution inside the specimen due to obstructed channels; the chrome plating treatment on the inner wall and the setting of the sealing gasket extend the service life of the hydraulic orifice 18, prevent medium leakage, ensure the stability of pressure transmission and the accuracy of test data, and provide a reliable pressure transmission guarantee for accurately determining the weld bearing capacity and deformation.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A device for measuring the bearing capacity and deformation of an L-shaped longitudinal joint in a steel-concrete composite column, characterized in that, include: Upper pressure plate (3), lower pressure plate (8), tie bolt (4), dial indicator mounting bracket (6), dial indicator (9), pressurizing pump (11), pressure gauge (1) and seal (7); The upper bearing plate (3) and the lower bearing plate (8) are connected by tie bolts (4) to form a clamping space for fixing the steel column specimen (5); The upper bearing plate (3) and lower bearing plate (8) are provided with sealing elements (7) on the contact surfaces with the steel column specimen (5); The lower pressure plate (8) is provided with a pressurization pipe (13) connected to a pressurization pump (11) for pressurizing the steel column specimen (5); The lower bearing plate (8) is also provided with a pressure gauge (1) mounting screw hole for mounting the pressure gauge (1); The dial indicator mounting bracket (6) is sleeved on the tie bolt (4) and fixed by the fastener (15), and the dial indicator (9) is installed on the dial indicator mounting bracket (6).

2. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The upper pressure plate (3) and the lower pressure plate (8) are provided with stiffening ribs (2).

3. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The tie bolt (4) is provided with a fastening nut (10) for adjusting the clamping force between the upper pressure plate (3) and the lower pressure plate (8).

4. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The dial indicator mounting bracket (6) is a ring or frame structure with multiple mounting holes for fixing the dial indicator (9).

5. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The sealing element (7) is made of rubber and is embedded in the grooves of the upper pressure plate (3) and the lower pressure plate (8), with its height being lower than the depth of the groove.

6. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The lower bearing plate (8) is provided with bolt holes (14) for inserting tie bolts (4).

7. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The pressurizing pump (11) is connected to the pressurizing pipeline (13) via a valve (12), which is used to control the pressurizing process.

8. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The dial gauge (9) is mounted on the dial gauge mounting bracket (6) via a magnetic base, with the gauge rod arranged perpendicularly or diagonally to the surface of the steel column specimen (5).

9. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: The upper bearing plate (3) and the lower bearing plate (8) are rectangular steel plates, and their dimensions match the cross-section of the steel column specimen (5).

10. The device for measuring the bearing capacity and deformation of the L-shaped longitudinal joint of a steel-concrete composite column according to claim 1, characterized in that: It also includes a hydraulic orifice (18) for fluid flow and pressure transmission.

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