Core concrete triaxial compressive stress detection device and detection method

Abstract

The invention discloses a core concrete triaxial compressive stress detection device and detection method, and the key point of the technical scheme is that the core concrete triaxial compressive stress detection device comprises a triaxial compressive stress detection table; a steel tube concrete placing table is formed on the triaxial compressive stress detection table; a triaxial compressive stress detection mechanism is assembled on the concrete filled steel tube placement table and comprises a base table arranged on a triaxial compressive stress detection table. Through reasonable arrangement of the triaxial compressive stress detection table, the concrete filled steel tube placement table and the triaxial compressive stress detection mechanism on the concrete filled steel tube placement table, stable placement of a test piece and close fit of the detection mechanism are realized, and the accuracy and reliability of the whole detection process are ensured; a layered supporting structure of the base table, the supporting frame and the bearing beam is combined with the two linear guide rails arranged in parallel in the transverse direction of the bearing beam and the guide rail platform sliding on the side faces of the linear guide rails, so that the detection device has good transverse moving and positioning capacity, the detection position can be conveniently and accurately adjusted, and the flexibility and the detection efficiency of the device are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of steel tube concrete detection, and particularly relates to a core concrete triaxial compression stress detection device and detection method. BACKGROUND

[0002] The core concrete compression stress detection in steel tube concrete refers to a technology for measuring and evaluating the compression stress generated by the concrete filled in the steel tube under load, which is crucial for evaluating the working state and bearing capacity of the steel tube concrete member, because there is mutual constraint between the steel tube and the core concrete, the steel tube provides lateral constraint to the concrete so that it is in a three-dimensional compression state to improve the bearing capacity, and the concrete provides internal support to the steel tube to delay local buckling. The detection method usually includes pre-embedding strain gauges or pressure sensors before concrete pouring, and the compression stress size is calculated by monitoring the strain change in the concrete, and indirect evaluation can also be performed by using ultrasonic wave, acoustic emission and other non-destructive testing technologies. Accurate understanding of the stress distribution state of the core concrete is of great significance for the design optimization, construction quality control and safety performance evaluation of the steel tube concrete structure.

[0003] The core concrete compression stress detection using the uniaxial detection method under the existing equipment has obvious technical limitations. The core concrete in the steel tube concrete member is actually in a complex three-dimensional compression stress state, the steel tube provides circumferential and radial constraint to the concrete, and the concrete simultaneously bears axial load. This multi-directional stress coupling effect is the key mechanism for the bearing capacity improvement of the steel tube concrete, and the uniaxial detection can only obtain stress data in one direction, and cannot fully reflect the real three-dimensional stress field distribution in the concrete, resulting in inaccurate evaluation of the actual working state of the member, which may underestimate or overestimate the bearing capacity and safety reserve of the member.

[0004] In addition, the uniaxial detection method is difficult to capture the complex interaction effect and stress transmission law between the steel tube and the core concrete. In actual engineering, due to construction deviation, material non-uniformity, load eccentricity and other factors, the stress distribution in the core concrete is often significantly non-uniform and directional difference, the detection data in a single direction lacks representativeness, and cannot effectively identify the local stress concentration area and potential weak links, which brings a blind area to the health monitoring and safety warning of large and important steel tube concrete structures, and may delay the timely discovery of structural damage and performance degradation.

[0005] Therefore, the core concrete triaxial compression stress detection device and detection method are proposed to solve the above problems. SUMMARY

[0006] In order to overcome the deficiencies of the prior art, the purpose of the present application is to provide a core concrete triaxial compression stress detection device and detection method, which has accurate triaxial detection and can improve the accurate detection of the triaxial compression stress of the core concrete in the steel pipe concrete.

[0007] The above technical purpose of the present application is realized by the following technical scheme:

[0008] A core concrete triaxial compression stress detection device, comprising a triaxial compression stress detection table; a detection platform is formed on the triaxial compression stress detection table; a triaxial compression stress detection mechanism is assembled and arranged on the detection platform, and the triaxial compression stress detection mechanism comprises a base table arranged on the triaxial compression stress detection table;

[0009] A steel pipe concrete placement table is further installed on the triaxial compression stress detection table, and the steel pipe concrete placement table is arranged on one side of the base table.

[0010] Further, a support frame is supported and arranged on the upper end surface of the base table; a bearing beam is supported and arranged on the upper end surface of the support frame, two linear guides are arranged in parallel along the transverse direction on the side surface of the bearing beam, and a guide platform is slidably arranged on the side surface of the two linear guides.

[0011] Further, a vertical rail is vertically arranged on the side surface of the guide platform, a guide rail seat is slidably arranged on the vertical rail, and a rotary air cylinder is installed on the side surface of the guide rail seat.

[0012] Further, a connecting shaft is installed on the output end of the rotary air cylinder, and a triaxial compression stress downward detection plate is installed on the side surface of the connecting shaft, and a resistance strain gauge is arranged at the bottom of the triaxial compression stress downward detection plate.

[0013] Further, a machine shell is sleeved on the side surface of the guide platform, the machine shell is arranged in a rectangular hollow seat body, and the rotary air cylinder is sleeved in the machine shell.

[0014] Further, a forward and reverse motor is installed on the side surface of the guide platform, and a rotary gear is rotatably arranged on the output end of the forward and reverse motor.

[0015] Further, a linear rack is fixedly installed on the side surface of the guide rail seat, and the rotary gear is engaged with the linear rack.

[0016] Further, a rectangular slot is formed in the bearing beam, and a cylinder push plate is slidably arranged in the rectangular slot, and a guide rod air cylinder is installed on the side surface of the bearing beam.

[0017] Further, the output end of the guide rod air cylinder is connected with the cylinder push plate, and the other side of the cylinder push plate passes through the bearing beam and is connected with the guide platform.

[0018] Based on this, the application also provides a method comprising the following steps:

[0019] S1: Place the steel pipe concrete test piece to be detected on the steel pipe concrete placement table on the triaxial compression stress detection table, ensure that the test piece position is stable and maintains appropriate distance with the triaxial compression stress detection mechanism on the side of the base table, check the surface state of the test piece and confirm that each sensor and detection system is in normal working state, and complete the preparation work before detection;

[0020] S2: Start the guide rod cylinder drive cylinder push plate to move, drive the guide rail platform to slide horizontally along the two linear guides on the bearing beam, move the triaxial compression stress lower detection plate to the appropriate position directly above the steel pipe concrete test piece, and then drive the rotary gear and linear rack through the forward and reverse motor to mesh, so that the guide rail seat descends along the vertical rail, and the relative position of the detection plate and the top surface of the test piece is adjusted;

[0021] S3: The triaxial compression stress lower detection plate applies axial pressure to the top of the test piece by driving the connecting shaft through the rotary cylinder, and the angle of the detection plate can be adjusted to realize stress loading in different directions. The resistance strain gauges installed at the bottom of the detection plate monitor and record the strain response data of the core concrete in different directions in real time. The stability support provided by the support frame and the bearing beam ensures the accuracy and reliability of the loading process. The machine shell protects the rotary cylinder and reduces external interference;

[0022] S4: Collect the multi-directional strain data collected by the resistance strain gauges during the detection process, convert the strain values into corresponding triaxial compression stress values according to the principles of material mechanics and constitutive relations, analyze the stress distribution characteristics and interaction relationship of the core concrete in the axial, radial and hoop directions, evaluate the actual working state and bearing capacity of the steel pipe concrete member, and reset the detection device through the forward and reverse motor and cylinder system after detection to prepare for the next detection.

[0023] In summary, the application has the following beneficial effects:

[0024] 1. By reasonably arranging the triaxial compression stress detection table, the steel pipe concrete placement table and the triaxial compression stress detection mechanism thereon, the stable placement of the test piece and the close cooperation of the detection mechanism are realized, ensuring the accuracy and reliability of the entire detection process. The hierarchical support structure of the base table, the support frame and the bearing beam, combined with the two linear guides arranged horizontally parallel to the bearing beam and the guide rail platform sliding on the side thereof, enables the detection device to have good horizontal movement and positioning capability, facilitating accurate adjustment of the detection position and improving the flexibility and detection efficiency of the device.

[0025] 2, the vertical track arranged on the side of the guide rail platform and the guide rail seat sliding thereon, cooperating with the three-axis compression stress lower detection plate installed by the rotary air cylinder, the connecting shaft and the bottom resistance strain gauge, realize the vertical height adjustment and angle rotation function of the detection device, can apply accurate multidirectional pressure to the surface of the test piece and measure the strain data in real time; at the same time, the rectangular hollow shell sleeved on the guide rail platform provides protection for the rotary air cylinder, the positive and negative rotation motor installed on the side of the guide rail platform drives the rotary gear to mesh with the straight tooth rail fixed on the side of the guide rail seat, realizing the accurate vertical driving of the detection mechanism; the transverse driving device composed of the air cylinder push plate sliding in the rectangular groove opened on the bearing beam and the guide rod air cylinder ensures the stable transverse movement of the whole detection mechanism, improves the automation degree and operation convenience of the device. The whole device has scientific and reasonable structure design, has multidimensional adjustment capacity and high-precision stress measurement function, and significantly improves the accuracy and application effectiveness of the concrete triaxial compression stress detection. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the overall installation structure schematic diagram of the application;

[0027] Figure 2 It is the overall installation structure schematic diagram of the triaxial compression stress detection mechanism of the application;

[0028] Figure 3 It is the connection structure schematic diagram of the developing plate and the rotary air cylinder of the application;

[0029] Figure 4 It is the connection structure schematic diagram of the air cylinder push plate and the guide rail platform of the application.

[0030] In all the drawings, the same reference signs represent the same technical features, specifically: 1, triaxial compression stress detection table; 2, triaxial compression stress detection mechanism; 21, base table; 22, support frame; 23, bearing beam; 24, linear guide rail; 25, guide rail platform; 26, machine shell; 27, vertical track; 28, guide rail seat; 29, rotary air cylinder; 210, triaxial compression stress lower detection plate; 211, positive and negative rotation motor; 212, rotary gear; 213, straight tooth rail; 214, guide rod air cylinder; 215, air cylinder push plate; 3, steel pipe concrete placement table. DETAILED DESCRIPTION

[0031] The application will be further described in detail below with reference to the drawings.

[0032] Wherein the same parts are represented by the same reference signs. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0033] First embodiment;

[0034] Referring to Figures 1-4 As shown in the figure, it is a core concrete triaxial compression stress detection device in a preferred embodiment of the application, which comprises a triaxial compression stress detection platform 1; a steel pipe concrete placement platform is formed on the triaxial compression stress detection platform 1; a triaxial compression stress detection mechanism 2 is assembled and arranged on the steel pipe concrete placement platform; the triaxial compression stress detection mechanism 2 comprises a base platform 21 arranged on the triaxial compression stress detection platform 1.

[0035] A steel pipe concrete placement platform 3 is also installed on the triaxial compression stress detection platform 1, and the steel pipe concrete placement platform 3 is arranged on one side of the base platform 21.

[0036] In this embodiment, the device comprises a triaxial compression stress detection platform 1 as a whole basic platform, a steel pipe concrete placement platform 3 is formed on the detection platform 1 for bearing the test piece, and a triaxial compression stress detection mechanism 2 is assembled and arranged on the detection platform, which comprises a base platform 21 arranged on the triaxial compression stress detection platform 1 as the mounting base of the detection mechanism. In addition, a separate steel pipe concrete placement platform 3 is also installed on the triaxial compression stress detection platform 1, and the placement platform is arranged on one side of the base platform 21 to form a structure in which the test piece placement area is arranged separately from the detection mechanism, which facilitates the loading and unloading of the test piece and the detection operation.

[0037] Second embodiment;

[0038] Referring to Figures 2-4 As shown in the figure, the upper end surface of the base platform 21 is supported by a support frame 22; the upper end surface of the support frame 22 is supported by a bearing beam 23, and two linear guides 24 are arranged in parallel along the transverse direction on the side surface of the bearing beam 23; a guide platform 25 is slidably arranged on the side surface of the two linear guides 24.

[0039] In this embodiment, the upper end surface of the base platform 21 is supported by a support frame 22 as a vertical support structure, and the upper end surface of the support frame 22 is supported by a bearing beam 23 to form a transverse bearing frame. Two linear guides 24 are arranged in parallel along the transverse direction on the side surface of the bearing beam 23, and a guide platform 25 is slidably arranged on the side surface of the two linear guides 24. The stable transverse movement of the guide platform 25 is realized by the cooperation of the two guides, and the detection mechanism can be accurately positioned to different positions above the test piece in the horizontal direction to perform detection operation.

[0040] Third embodiment;

[0041] Referring to Figures 2-4 As shown in the figure, a vertical rail 27 is vertically arranged on the side surface of the guide platform 25, and a guide seat 28 is slidably arranged on the vertical rail 27; a rotary air cylinder 29 is installed on the side surface of the guide seat 28.

[0042] In this embodiment, vertical rails 27 are vertically arranged on the side of the guide rail platform 25, and guide rail seats 28 are slidingly arranged on the vertical rails 27 to realize the vertical lifting movement of the detection components. Rotary cylinders 29 are installed on the side of the guide rail seats 28, and driving force and rotary adjustment functions are provided through the rotary cylinders 29, so that the detection device further has an angle adjustment capability on the basis of completing two-dimensional positioning in the horizontal and vertical directions, forming a three-dimensional space-adjustable detection system.

[0043] Fourth embodiment;

[0044] Referring to Figures 2-4 As shown, a connecting shaft is installed at the output end of the rotary cylinder 29, and a three-axis compression stress downward pressing detection plate 210 is installed on the side of the connecting shaft.

[0045] In this embodiment, a connecting shaft is installed at the output end of the rotary cylinder 29 as a power transmission component, and a three-axis compression stress downward pressing detection plate 210 is installed on the side of the connecting shaft as a working end for direct force application and detection. A resistance strain gauge is arranged at the bottom of the three-axis compression stress downward pressing detection plate 210 as a strain sensing element. When the detection plate 210 applies pressure to the test piece, the resistance strain gauge can sense and measure the strain change on the surface of the test piece, realizing real-time monitoring and data collection of the three-axis compression stress state of the concrete-filled steel tube.

[0046] Fifth embodiment;

[0047] Referring to Figures 2-4 As shown, a machine shell 26 is sleeved on the side of the guide rail platform 25, and the machine shell 26 is arranged in a rectangular hollow seat body and sleeved on the rotary cylinder 29.

[0048] In this embodiment, a machine shell 26 is sleeved on the side of the guide rail platform 25 as a protective cover, and the machine shell 26 is arranged in a rectangular hollow seat body and sleeved on the rotary cylinder 29 in the internal space. The arrangement of the machine shell 26 provides physical protection for the rotary cylinder 29, avoids damage to the cylinder caused by external collision or environmental factors during the detection process, and plays a role in tidiness, beauty and safety protection. Meanwhile, the rectangular hollow structure does not affect the normal operation and heat dissipation of the cylinder.

[0049] Sixth embodiment;

[0050] Referring to Figures 2-4 As shown, a forward and reverse motor 211 is installed on the side of the guide rail platform 25, and a rotary gear 212 is rotationally arranged at the output end of the forward and reverse motor 211.

[0051] In this embodiment, the guide rail platform 25 is provided with a reversible motor 211 as the power source for vertical movement, and a rotating gear 212 is arranged at the output end of the reversible motor 211. Through the forward and reverse rotation function of the reversible motor 211, the rotating gear 212 is driven to rotate clockwise or counterclockwise, providing controllable bidirectional driving power for the vertical lifting of the detection device, realizing accurate adjustment and positioning control of the detection height.

[0052] Seventh embodiment;

[0053] Referring to Figures 2-4 The guide rail seat 28 is provided with a linear rack 213, and the rotating gear 212 is engaged with the linear rack 213.

[0054] In this embodiment, the guide rail seat 28 is provided with a linear rack 213, and the rotating gear 212 is engaged with the linear rack 213 to form a gear and rack transmission mechanism. When the reversible motor 211 drives the rotating gear 212 to rotate, the rotating motion is converted into linear motion through the engagement of the gear and the linear rack 213, pushing the guide rail seat 28 to slide up and down along the vertical rail 27, realizing accurate control and stable transmission of the vertical position of the detection device.

[0055] Eighth embodiment;

[0056] Referring to Figures 2-4 The bearing beam 23 is provided with a rectangular slot and a cylinder push plate 215 slidingly arranged in the rectangular slot, and the bearing beam 23 is provided with a guide rod cylinder 214.

[0057] In this embodiment, the bearing beam 23 is provided with a rectangular slot as a sliding guide space, and the cylinder push plate 215 is slidingly arranged in the rectangular slot as a pushing transmission component. The bearing beam 23 is provided with a guide rod cylinder 214 as a driving device for horizontal movement, and the guide rod cylinder 214 drives the cylinder push plate 215 to slide in the rectangular slot through the extension and retraction movement, thereby realizing horizontal pushing of the guide rail platform 25 and completing the horizontal positioning function of the detection mechanism.

[0058] Ninth embodiment;

[0059] Referring to Figures 2-4 The output end of the guide rod cylinder 214 is connected with the cylinder push plate 215, and the other side of the cylinder push plate 215 extends through the bearing beam 23 and is connected with the guide rail platform 25.

[0060] In this embodiment, the output end of the guide rod cylinder 214 is connected with the cylinder push plate 215 to form a driving connection relationship, the other side of the cylinder push plate 215 passes through the rectangular slot of the bearing beam 23 and extends to be connected with the guide rail platform 25, and a complete power transmission path is formed. When the guide rod cylinder 214 performs the extension and retraction action, the power is transmitted to the guide rail platform 25 through the cylinder push plate 215 as an intermediate transmission piece, the guide rail platform 25 is pushed to slide horizontally along the two linear guides 24, and the horizontal movement and accurate positioning control of the detection mechanism are realized;

[0061] On this basis, the application further provides a detection method, which comprises the following steps:

[0062] The first step: the steel pipe concrete test piece to be detected is placed on the steel pipe concrete placing table 3 on the triaxial compression stress detection table 1, and the test piece is ensured to be stably positioned; the guide rod cylinder 214 installed on the side of the bearing beam 23 is started, the output end of the guide rod cylinder 214 pushes the cylinder push plate 215 to slide in the rectangular slot of the bearing beam 23, the other side of the cylinder push plate 215 passes through the bearing beam 23 and extends to be connected with the guide rail platform 25, the guide rail platform 25 moves horizontally along the two linear guides 24 arranged in parallel on the side of the bearing beam 23, the guide rail platform 25 and the detection mechanism supported thereby are moved to the target position above the steel pipe concrete test piece, and the horizontal positioning of the detection device is completed.

[0063] The second step: after the horizontal positioning is completed, the forward and reverse motor 211 installed on the side of the guide rail platform 25 is started, the output end of the forward and reverse motor 211 rotates the rotary gear 212 arranged to be in mesh with the linear rack 213 fixedly installed on the side of the guide rail base 28, the guide rail base 28 slides up and down along the vertical rail 27 arranged vertically on the side of the guide rail platform 25 through the meshing transmission of the gear and the rack, the vertical position of the detection device is accurately adjusted, and the connecting shaft and the triaxial compression stress lower detection plate 210 installed on the side of the connecting shaft and driven by the rotary cylinder 29 installed on the side of the guide rail base 28 are adjusted in angle rotation, the machine shell 26 is a rectangular hollow seat body, the rotary cylinder 29 is sleeved in the machine shell 26 to play a protection role, and it is ensured that the detection plate 210 can contact the surface of the test piece at different angles.

[0064] Third step: when the triaxial compression stress under the pressing plate 210 is adjusted to the appropriate position and angle, the driving force is applied to the connecting shaft through the rotary cylinder 29, so that the triaxial compression stress under the pressing plate 210 applies pressure load to the surface of the steel pipe concrete test piece, and the resistance strain gauge arranged at the bottom of the detection plate 210 senses and records the strain data of the test piece in different directions in real time; during the whole detection process, the support frame 22 supported on the upper end face of the base table 21 and the bearing beam 23 supported on the upper end face of the support frame 22 jointly constitute a stable support system, which ensures the loading accuracy and measurement reliability of the triaxial compression stress detection mechanism 2, and the comprehensive detection of the axial, radial and circumferential compression stresses of the core concrete test piece can be realized by adjusting the angle and loading degree of the rotary cylinder 29.

[0065] The basic principles and main features of the present application and the advantages of the present application are shown and described above; it should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application; the scope of protection of the present application is defined by the appended claims and their equivalents.

[0066] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description in the specification and the attached drawings; the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art; the mechanical parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection mode in the prior art, which will not be described in detail here.

Claims

1. A core concrete triaxial compression stress detection device, characterized by: Including three axial compression stress detection platform (1);The three axial compression stress detection platform (1) is formed with detection platform;The detection platform is equipped with three axial compression stress detection mechanism (2), and the three axial compression stress detection mechanism (2) includes the base table (21) arranged on the three axial compression stress detection platform (1); The three axial compression stress detection platform (1) is also installed with steel pipe concrete placement platform (3), and the steel pipe concrete placement platform (3) is arranged on one side of the base table (21).

2. The core concrete triaxial compression stress detection device according to claim 1, characterized in that: The support frame (22) is supported on the upper end surface of the base table (21);The support frame (22) is supported on the upper end surface of the support frame (22), and the support beam (23) is arranged on the side of the support beam (23) along the transverse direction parallelly;Two straight guide rails (24) are arranged on the side of the two straight guide rails (24) along the transverse direction parallelly.

3. The core concrete triaxial compression stress detection device according to claim 2, characterized by: The vertical rail (27) is vertically arranged on the side of the guide rail platform (25), and the guide rail seat (28) is slidably arranged on the vertical rail (27);The rotary air cylinder (29) is installed on the side of the guide rail seat (28).

4. The core concrete triaxial compression stress detection device according to claim 3, characterized by: The connecting shaft is installed on the output end of the rotary air cylinder (29), and the three axial compression stress lower detection plate (210) is installed on the side of the connecting shaft, and the three axial compression stress lower detection plate (210) is arranged on the bottom of the three axial compression stress lower detection plate (210).

5. The core concrete triaxial compression stress detection device according to claim 4, characterized by: The guide rail platform (25) is sleeved with the machine shell (26), and the machine shell (26) is arranged in a rectangular hollow seat body and the rotary air cylinder (29) is sleeved in the machine shell (26).

6. The core concrete triaxial compression stress detection device according to claim 2, characterized by: The positive and negative rotation motor (211) is installed on the side of the guide rail platform (25), and the rotary gear (212) is rotatably arranged on the output end of the positive and negative rotation motor (211).

7. The core concrete triaxial compression stress detection device according to claim 3 or 6, characterized by: The straight toothed rail (213) is fixedly installed on the side of the guide rail seat (28), and the rotary gear (212) is engaged with the straight toothed rail (213).

8. The core concrete triaxial compression stress detection device according to claim 2, characterized by: The rectangular slot is formed in the support beam (23), and the cylinder push plate (215) is slidably arranged in the rectangular slot, and the guide rod air cylinder (214) is installed on the side of the support beam (23).

9. The core concrete triaxial compression stress detection device according to claim 8, characterized by: The output end of the guide rod air cylinder (214) is connected with the cylinder push plate (215), and the other side of the cylinder push plate (215) penetrates through the support beam (23) and extends to be connected with the guide rail platform (25).

10. A triaxial compression stress detection method, which is implemented using the device according to any one of claims 1 to 9, characterized by, It includes the following steps: S1: the steel pipe concrete test piece to be detected is placed on the steel pipe concrete placement platform (3) on the three axial compression stress detection platform (1), the position of the test piece is ensured to be stable, and the three axial compression stress detection mechanism (2) on the side of the base table (21) is kept at a proper distance, the surface state of the test piece is checked, and it is confirmed that each sensor and detection system is in normal working state, and the preparation work before detection is completed; S2: Start the guide rod cylinder (214) to drive the cylinder push plate (215) to move, drive the guide rail platform (25) to slide along the two linear guides (24) on the bearing beam (23) transversely, make the triaxial compression stress detection plate (210) move to the appropriate position above the concrete-filled steel tubular specimen, then drive the rotating gear (212) and linear rack (213) to mesh through the forward and reverse motor (211), make the guide rail seat (28) descend along the vertical rail (27), adjust the relative position of the detection plate and the top surface of the specimen; S3: Drive the connecting shaft through the rotary cylinder (29) to make the triaxial compression stress detection plate (210) apply axial pressure to the top of the specimen, at the same time, adjust the angle of the detection plate to realize stress loading in different directions, the resistance strain gauges installed at the bottom of the detection plate monitor and record the strain response data of the core concrete in different directions in real time, the stable support provided by the support frame (22) and the bearing beam (23) ensures the accuracy and reliability of the loading process, the machine shell (26) protects the rotary cylinder (29) and reduces external interference; S4: Collect the multi-directional strain data collected by the resistance strain gauges during the detection process, convert the strain values into corresponding triaxial compression stress values according to the principles of material mechanics and the constitutive relation, analyze the stress distribution characteristics and interaction relationship of the core concrete in the axial, radial and hoop directions, evaluate the actual working state and bearing capacity of the concrete-filled steel tubular member, reset the detection device through the forward and reverse motor and cylinder system after the detection is completed, and prepare for the next detection.

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