A kind of building steel structure deformation performance detection device and method

Abstract

The invention discloses a deformation performance detection device and method for a building steel structure, which belongs to the technical field of steel structure deformation testing, and comprises: a base, a frame body is arranged in the middle of the upper end surface of the base; a guide plate, which is installed on the base and located in the middle of the frame body, and a slide groove is arranged on the upper end surface of the guide plate; two loading seats are arranged on the left and right, and the two loading seats are slidably connected with the slide groove through a slider fixed on the bottom, and a telescopic driving rod corresponding to the loading seat is arranged on the base; a dynamic stress simulation unit is arranged on each of the loading seats, and the two ends of the I-beam are respectively connected to each of the dynamic stress simulation units; a pressurizing mechanism, the center of which is fixed in the frame body and located just above the guide plate; the invention can provide dynamically variable loads to the two ends of the I-beam, and provide central stress loading to the I-beam from the middle, so as to better simulate complex load combinations and better evaluate the deformation fatigue life of the steel structure.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure deformation testing, and in particular relates to a device and method for detecting deformation performance of a building steel structure. Background Art

[0002] With the rise of high-rise buildings, large bridges and special structures, steel structures are widely used due to their high strength and light weight. However, ensuring the safety and durability of these steel structures has become the primary issue at present; currently, most steel structure safety and quality are evaluated based on steel structure deformation performance testing; such as the invention patent with publication number CN116735368B, which can use a two-level pressure method to apply a downward pressure load to the pressure plate, thereby relieving pressure at the moment the truss deforms. Although it can effectively prevent the truss from deforming too much during testing, the test process is too simple and cannot simulate the degree of deformation of the steel structure caused by dynamic load changes under actual working conditions, such as resonance, impact load effects, etc. These are the main factors that can cause steel structure failure in actual applications, and it is difficult to effectively evaluate the fatigue life and fatigue resistance of steel structures;

[0003] Therefore, it is necessary to provide a device and method for detecting deformation performance of building steel structures to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a deformation performance detection device for a building steel structure, comprising:

[0005] A base, wherein a frame body is arranged in the middle of the upper end surface thereof;

[0006] A guide rail plate is installed on the base and located in the middle of the frame body, and a slide groove is provided on the upper end surface of the guide rail plate;

[0007] The loading seats are two on the left and right, and both loading seats are slidably connected to the slide groove through a slider fixed at the bottom. The base is provided with a telescopic driving rod corresponding to the loading seat, and the telescopic end of each telescopic driving rod is connected to the loading seat respectively;

[0008] A dynamic stress simulation unit is arranged on each of the loading seats, and the two ends of the I-beam are respectively connected to each of the dynamic stress simulation units. The dynamic stress simulation unit applies a dynamic load to the two ends of the I-beam to simulate the load-bearing changes of the building environment;

[0009] A pressurizing mechanism, the center of which is fixed in the frame body and located directly above the guide rail plate, and the pressurizing mechanism provides central pressurization to the middle of the I-beam, so as to intuitively simulate the deformation of the I-beam after bearing force;

[0010] The dynamic stress simulation unit comprises:

[0011] The mounting frame is fixed on the loading seat by bolts, and the loading seat is provided with a mounting slot;

[0012] A guide rail is arranged as an annular structure, the guide rail is vertically connected in the mounting groove and fixed to the mounting frame;

[0013] The track seats are configured as two and centrally symmetrically distributed on the guide rail, and the two track seats are both slidably mounted along the guide rail via rollers;

[0014] A power loader is installed on one side of each of the track seats, and a rotating shaft is horizontally installed on each of the power loaders, and guide grooves are provided on opposite sides of the two rotating shafts;

[0015] The steel plate frame has two ends which are detachably mounted in the guide grooves of the two rotating shafts. An opening is arranged in the middle of the steel plate frame so that the I-beam can be inserted into the steel plate frame through the opening. Beam plates are fixed at the ends of the steel plate frame.

[0016] Further, as a preference, a linkage frame is fixed on the side of the track seat away from the power loader, so that the two track seats can slide synchronously along the guide rail through the linkage frame; two loading cylinders are connected to the mounting groove of the loading seat, and the output end of the loading cylinder is connected to the track seat.

[0017] Further, as a preference, the extension and retraction working directions of the loading cylinders are opposite, that is, when one of the loading cylinders is in the extension working state, the other loading cylinder is in the retraction working state.

[0018] Further, preferably, the power loaders on the two loading seats are deflected in opposite directions in the dynamic stress simulation, that is, when the power loader on one of the loading seats is deflected clockwise along the guide rail through the track seat, the power loader on the other loading seat is deflected counterclockwise along the guide rail through the track seat.

[0019] Further, preferably, the pressurizing mechanism comprises:

[0020] A positioning plate is horizontally arranged in the frame body, and a plurality of vertically arranged vertical rods are symmetrically installed in the frame body, and the lower ends of the vertical rods are fixed to the positioning plate;

[0021] The main pressure plate is slidably mounted below the positioning plate via a support rod fixed to its upper end surface;

[0022] A main loading cylinder is fixed on the positioning plate, and an output end of the main loading cylinder is connected to the main pressure plate;

[0023] The pressing block is fixed at the middle part of the lower end surface of the main pressing plate.

[0024] Further, as a preference, an upper loading plate is also arranged in parallel on the main pressure plate, a plurality of spring struts are connected between the upper loading plate and the main pressure plate, and a pulse loading cylinder is fixed on the positioning plate, and an output end of the pulse loading cylinder is connected to the upper loading plate.

[0025] Further, as a preference, the power loader comprises:

[0026] A fixed ring cylinder, inside which a shaft cylinder is rotatably arranged through the center of the bearing, and the rotating shaft is coaxially fixed on the shaft cylinder;

[0027] A sealing liquid seat is arranged below the fixed ring cylinder, wherein an oil inlet passage and an oil outlet passage are symmetrically distributed in the sealing liquid seat, and both the oil inlet passage and the oil outlet passage are connected to the fixed ring cylinder;

[0028] Liquid plate racks are circumferentially distributed on the side wall of the shaft cylinder;

[0029] The baffle blocks are arranged corresponding to the liquid plate racks, and each of the baffle blocks is fixed to the inner wall of the fixed ring cylinder.

[0030] Furthermore, preferably, a torsion spring is provided in the shaft cylinder, and the elastic force of the torsion spring causes the liquid plate frame on the shaft cylinder to contact and cooperate with the baffle block; the liquid plate frame is composed of a plurality of arranged leaf plates, and the leaf plates are fixed to each other by connecting rods.

[0031] Further, preferably, hydraulic oil is delivered to the oil inlet passage by a high-pressure pump, and the hydraulic oil circulates in the fixed ring cylinder.

[0032] A method for detecting deformation performance of a building steel structure comprises the following steps:

[0033] S1. Preparation and pretreatment of I-beam samples: Select I-beams used in construction, clean and remove rust and scale on their surfaces to ensure that their size, shape and material meet the test standards;

[0034] S2. Install and fix the specimen, place the I-beam horizontally between the two loading seats, and control the two loading seats to slide toward each other through the telescopic driving rod, so that the beam plate on the steel plate frame abuts against the end of the I-beam. At this time, the transverse frame beam of the I-beam is mounted above the steel plate frame;

[0035] S3. Loading and testing, preferably providing dynamic loads to both ends of the I-beam through the dynamic stress simulation unit on the loading seat; on the one hand, the loading cylinders on each loading seat can drive the power loader to slide along the guide rail, so that the two ends of the I-beam can achieve torsion loading; on the other hand, the power loader can perform dynamic bending stress loading on the I-beam, thereby simulating the load changes in the actual building structure;

[0036] S4. Center pressure test: the main loading cylinder and pulse loading cylinder in the pressure mechanism are used to apply load to the middle part of the I-beam, gradually increasing the load from zero to the design load, monitoring and recording the deformation and corresponding load value at each stage, and observing and recording the deformation mode of the I-beam under different load levels;

[0037] S5. Deformation performance data analysis: use the collected data to calculate the key mechanical performance indicators of the I-beam, such as elastic modulus, yield strength, and ultimate strength, analyze the deformation curve of the I-beam, and evaluate the toughness and stability of the I-beam.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] In the deformation performance detection of building steel structures in the present invention, a dynamic stress simulation unit is mainly used to provide dynamically variable loads on both ends of the I-beam, and then a pressurizing mechanism provides central stress loading to the I-beam from the middle, thereby better simulating various complex load combinations that the structure will encounter in the real environment, including the superposition effect of static and dynamic loads, which is helpful to evaluate the deformation fatigue life of the steel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 It is a structural schematic diagram of the dynamic stress simulation unit in the present invention;

[0042] Figure 3 A half-section stereoscopic view of the loading seat in the present invention;

[0043] Figure 4 A half-section front view of the loading seat in the present invention;

[0044] Figure 5 It is a structural schematic diagram of the pressurizing mechanism in the present invention;

[0045] Figure 6 It is a structural schematic diagram of the power loader in the present invention;

[0046] Figure 7 for Figure 6 A schematic diagram of the structure enlargement in the middle;

[0047] In the figure: 1. base; 11. frame body; 12. telescopic drive rod; 13. guide plate; 2. loading seat; 3. pressurizing mechanism; 31. positioning plate; 32. vertical rod; 33. main pressure plate; 34. pressure block; 35. main loading cylinder; 36. upper loading plate; 37. spring support; 38. pulse loading cylinder; 41. mounting frame; 42. guide rail; 43. track seat; 44. rotating shaft; 45. steel plate frame; 46. beam plate; 47. loading cylinder; 5. power loader; 51. fixed ring cylinder; 52. shaft cylinder; 53. sealing liquid seat; 54. oil inlet channel; 55. oil outlet channel; 56. baffle block; 6. leaf plate; 61. connecting rod. DETAILED DESCRIPTION

[0048] See also Figure 1-Figure 7 In an embodiment of the present invention, a deformation performance detection device for a building steel structure comprises:

[0049] The base 1 has a frame body 11 disposed in the middle of its upper end surface;

[0050] A guide rail plate 13 is installed on the base 1 and is located in the middle of the frame body 11. The upper end surface of the guide rail plate 13 is provided with a slide groove;

[0051] The loading seats 2 are two arranged on the left and right sides, and the two loading seats 2 are slidably connected to the slide groove through a slider fixed at the bottom. The base 1 is provided with a telescopic driving rod 12 corresponding to the loading seat 2, and the telescopic end of each telescopic driving rod 12 is respectively connected to the loading seat 2; so that the loading seat 2 can be driven to move closer to or away from the inside by the telescopic driving rod 12;

[0052] A dynamic stress simulation unit is arranged on each of the loading seats 2, and the two ends of the I-beam are respectively connected to each of the dynamic stress simulation units. The dynamic stress simulation unit applies dynamic loads to the two ends of the I-beam to simulate the load-bearing changes of the building environment; it is closer to the complex dynamic effects that actual buildings are subjected to, such as wind loads, earthquake effects, etc., which improves the practical value and credibility of the test results, and can effectively evaluate the fatigue life of materials and structures, which is crucial for long-term performance prediction;

[0053] The pressurizing mechanism 3 is centrally fixed in the frame body 11 and is located directly above the guide rail plate 13. The pressurizing mechanism 3 provides central pressurization to the middle of the I-beam so as to intuitively simulate the deformation of the I-beam after bearing force. That is to say, the pressurizing mechanism 3 can cooperate with the dynamic stress simulation unit to pressurize the middle of the I-beam, thereby directly acting on the core area of ​​the I-beam, making the structural deformation effect more intuitive, convenient for observation and recording, and helpful for in-depth understanding of the load transfer path and structural response characteristics. Moreover, central pressurization is easy to induce stress concentration in the I-beam, which is particularly critical for testing the strength limit of the material and evaluating the potential brittle fracture risk. In general, by combining the dynamic loads at both ends with the static pressure load in the middle, the bending deformation performance of the I-beam under complex load modes can be more comprehensively evaluated, thereby improving the comprehensiveness and accuracy of the test.

[0054] The dynamic stress simulation unit comprises:

[0055] The mounting frame 41 is fixed on the loading seat 2 by bolts, and the loading seat 2 has a mounting slot;

[0056] The guide rail 42 is configured as an annular structure, and the guide rail 42 is vertically connected in the mounting groove and fixed to the mounting frame 41;

[0057] The track seats 43 are configured as two and centrally symmetrically distributed on the guide rail 42, and the two track seats 43 are both slidably installed along the guide rail 42 through rollers;

[0058] A power loader 5 is installed on one side of each of the track seats 43. A rotating shaft 44 is horizontally installed on each of the power loader 5. The opposite surfaces of the two rotating shafts 44 are provided with guide grooves.

[0059] The steel plate frame 45 has both ends that are detachably mounted in the guide grooves of the two rotating shafts 44. An opening is provided in the middle of the steel plate frame 45 so that the I-beam can be inserted into the steel plate frame 45 through the opening. The ends of the steel plate frame 45 are fixed with beam plates 46, that is, the ends of the I-beams can rest against the beam plates 46 to avoid displacement during testing.

[0060] In this embodiment, a linkage frame is fixed on the side of the track seat 43 away from the power loader 5, so that the two track seats 43 can slide synchronously along the guide rail 42 through the linkage frame; two loading cylinders 47 are connected to the installation groove of the loading seat 2, and the output end of the loading cylinder 47 is connected to the track seat 43.

[0061] As a preferred embodiment, the retracting and extending working directions of the loading cylinders 47 are opposite, that is, when one of them is in the extending working state, the other loading cylinder 47 is in the retracting working state, so that the end of the I-beam can turn counterclockwise or clockwise while sliding along the guide rail 42 with the track seat 43.

[0062] In this embodiment, the power loaders 5 on the two loading seats 2 are deflected in opposite directions in the dynamic stress simulation. That is, when the power loader 5 on one of the loading seats 2 is deflected clockwise along the guide rail 42 through the track seat 43, the power loader 5 on the other loading seat 2 is deflected counterclockwise along the guide rail 42 through the track seat 43, thereby providing torsional stress to the I-beam to more closely reflect the actual working condition in specific application scenarios (such as torsional deformation caused by strong winds).

[0063] In this embodiment, the pressurizing mechanism 3 includes:

[0064] A positioning plate 31 is horizontally arranged in the frame body 11. A plurality of vertically arranged vertical rods 32 are symmetrically installed in the frame body 11. The lower ends of the vertical rods 32 are fixed to the positioning plate 31.

[0065] The main pressure plate 33 is slidably mounted below the positioning plate 31 via a support rod fixed to its upper end surface;

[0066] A main loading cylinder 35 is fixed on the positioning plate 31, and an output end of the main loading cylinder 35 is connected to the main pressure plate 33;

[0067] The pressing block 34 is fixed at the middle part of the lower end surface of the main pressing plate 33 .

[0068] In this embodiment, an upper loading plate 36 is also arranged in parallel on the main pressure plate 33, and a plurality of spring struts 37 are connected between the upper loading plate 36 and the main pressure plate 33, and a pulse loading cylinder 38 is fixed on the positioning plate 31, and the output end of the pulse loading cylinder 38 is connected to the upper loading plate 36. The pulse loading cylinder 38 can provide impact vibrations of different frequencies and can simulate the dynamic impact loads commonly found in nature or industrial environments. Combined with the static or periodic stress loading of the main loading cylinder 35, it is closer to the composite stress state under actual working conditions; it is conducive to in-depth research on the fatigue characteristics of I-beams under alternating loads, evaluating their durability and safety under long-term use, and preventing sudden fractures.

[0069] As a preferred embodiment, the power loader 5 comprises:

[0070] The fixed ring cylinder 51 has a shaft cylinder 52 rotatably arranged inside the cylinder through the bearing center, and the rotating shaft 44 is coaxially fixed on the shaft cylinder 52;

[0071] The sealing liquid seat 53 is arranged below the fixed ring cylinder 51. The sealing liquid seat 53 has an oil inlet passage 54 and an oil outlet passage 55 symmetrically distributed therein. The oil inlet passage 54 and the oil outlet passage 55 are both connected to the fixed ring cylinder 51.

[0072] Liquid plate racks, circumferentially distributed on the side wall of the shaft cylinder 52;

[0073] The baffle blocks 56 are arranged corresponding to the liquid plate racks, and each of the baffle blocks 56 is fixed to the inner wall of the fixed ring cylinder 51 .

[0074] In this embodiment, a torsion spring is provided in the shaft cylinder 52, and the liquid plate frame on the shaft cylinder 52 is in contact and cooperate with the baffle block 56 through the elastic force of the torsion spring; the liquid plate frame is composed of a plurality of arranged leaf plates 6, and the leaf plates 6 are fixed to each other by connecting rods 61.

[0075] In this embodiment, hydraulic oil is delivered to the oil inlet passage 54 by a high-pressure pump, and the hydraulic oil circulates in the fixed ring cylinder 51. That is to say, when the hydraulic oil circulates continuously in the fixed ring cylinder, the liquid plate frame can control the shaft cylinder 52 to deflect under the push of the hydraulic oil. At this time, the rotating shaft 44 in the shaft cylinder 52 can provide bending stress loading to the end of the I-beam (wherein, the shaft cylinders 52 in the two fixed ring cylinders on the same loading seat rotate in the same direction, that is, the end of the I-beam is bent in one direction at the same time); thereby, the power loaders on the two loading seats cooperate with each other to bend the I-beam inward or outward.

[0076] A method for detecting deformation performance of a building steel structure comprises the following steps:

[0077] S1. Preparation and pretreatment of I-beam samples: Select I-beams used in construction, clean and remove rust and scale on their surfaces to ensure that their size, shape and material meet the test standards;

[0078] S2. Install and fix the sample, place the I-beam horizontally between the two loading seats 2. The horizontal placement of the I-beam allows the observer to clearly observe the deformation and potential damage signs during the loading process from multiple angles, which is conducive to real-time data analysis and recording. The two loading seats 2 are controlled to slide toward each other by the telescopic drive rod 12, so that the beam plate 46 on the steel plate frame 45 is against the end of the I-beam. At this time, the transverse frame beam of the I-beam is mounted above the steel plate frame 45; the rigidity of the entire loading system is enhanced, unnecessary vibration during the test is reduced, and the loading stability and test accuracy are improved;

[0079] S3. Loading and testing, preferably providing dynamic loads to both ends of the I-beam through the dynamic stress simulation unit on the loading seat 2; wherein, on the one hand, the loading cylinder 47 on each loading seat 2 can drive the power loader 5 to slide along the guide rail 42, so that the two ends of the I-beam can achieve torsion loading; on the other hand, the power loader 5 can perform dynamic bending stress loading on the I-beam; thereby simulating the load changes in actual building structures; combining torsion and dynamic bending loading, it is possible to reproduce various complex load combinations encountered by building steel structures in actual applications on a single experimental platform, thereby improving the authenticity and comprehensiveness of the simulation; thereby more accurately evaluating the bearing capacity, toughness and fatigue life of the I-beam under the combined action of torsion and bending, which helps to discover potential design defects and optimize the safety and durability of the structure;

[0080] S4. Central pressure test: the main loading cylinder 35 and the pulse loading cylinder 38 in the pressure mechanism 3 are used to apply a load to the middle of the I-beam, gradually increasing the load from zero to the design load, monitoring and recording the deformation amount and the corresponding load value at each stage, and observing and recording the deformation mode of the I-beam under different load levels;

[0081] S5. Deformation performance data analysis: use the collected data to calculate the key mechanical performance indicators of the I-beam, such as elastic modulus, yield strength, and ultimate strength, analyze the deformation curve of the I-beam, and evaluate the toughness and stability of the I-beam.

[0082] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A deformation performance detection device for building steel structure, characterized in that: It includes: A base (1), wherein a frame body (11) is provided in the middle of an upper end surface thereof; A guide rail plate (13) is mounted on the base (1) and is located in the middle of the frame body (11), and a slide groove is provided on the upper end surface of the guide rail plate (13); The loading seats (2) are two loading seats (2) arranged on the left and right, and the two loading seats (2) are slidably connected to the slide groove via a slider fixed at the bottom. The base (1) is provided with a telescopic driving rod (12) corresponding to the loading seat (2), and the telescopic end of each telescopic driving rod (12) is respectively connected to the loading seat (2); A dynamic stress simulation unit is arranged on each of the loading seats (2), and the two ends of the I-beam are respectively connected to each of the dynamic stress simulation units. The dynamic stress simulation unit applies a dynamic load to the two ends of the I-beam to simulate the load-bearing changes of the building environment; A pressure mechanism (3) whose center is fixed in the frame body (11) and is located directly above the guide rail plate (13), wherein the pressure mechanism (3) provides central pressure to the middle of the I-beam so as to intuitively simulate the deformation of the I-beam after bearing force; The dynamic stress simulation unit comprises: A mounting frame (41) is fixed to the loading seat (2) by means of bolts, wherein a mounting groove is provided in the loading seat (2); A guide rail (42) is arranged in an annular structure, wherein the guide rail (42) is vertically connected in the mounting groove and fixed to the mounting frame (41); The track seats (43) are configured as two and centrally symmetrically distributed on the guide rail (42), and the two track seats (43) are both slidably mounted along the guide rail (42) via rollers; A power loader (5) is mounted on one side of each of the track seats (43), a rotating shaft (44) is horizontally mounted on each of the power loaders (5), and guide grooves are provided on opposite sides of the two rotating shafts (44); The steel plate frame (45) has two ends that are detachably mounted in the guide grooves of the two rotating shafts (44), and an opening is provided in the middle of the steel plate frame (45) so that an I-beam can be inserted into the steel plate frame (45) through the opening. The ends of the steel plate frame (45) are fixed with beam plates (46).

2. A building steel structure deformation performance detection device according to claim 1, characterized in that: A linkage frame is fixed to the side of the track seat (43) away from the power loader (5), so that the two track seats (43) slide synchronously along the guide rail (42) through the linkage frame; two loading cylinders (47) are connected to the mounting groove of the loading seat (2), and the output end of the loading cylinder (47) is connected to the track seat (43).

3. A deformation performance detection device for building steel structure according to claim 2, characterized in that: The loading cylinders (47) have opposite extension and retraction working directions, that is, when one of the loading cylinders (47) is in the extension working state, the other loading cylinder (47) is in the retraction working state.

4. A building steel structure deformation performance detection device according to claim 2, characterized in that: The power loaders (5) on the two loading seats (2) are deflected in opposite directions in the dynamic stress simulation, that is, when the power loaders (5) on one of the loading seats (2) are deflected clockwise along the guide rail (42) through the track seat (43), the power loaders (5) on the other loading seat (2) are deflected counterclockwise along the guide rail (42) through the track seat (43).

5. The deformation performance detection device for building steel structure according to claim 3 is characterized in that: The pressurizing mechanism (3) comprises: A positioning plate (31) is horizontally arranged in the frame body (11), a plurality of vertically arranged vertical rods (32) are symmetrically installed in the frame body (11), and the lower ends of the vertical rods (32) are fixed to the positioning plate (31); The main pressure plate (33) is slidably mounted below the positioning plate (31) via a support rod fixed to its upper end surface; A main loading cylinder (35) is fixed on the positioning plate (31), and an output end of the main loading cylinder (35) is connected to the main pressure plate (33); The pressing block (34) is fixed to the middle portion of the lower end surface of the main pressing plate (33).

6. A deformation performance detection device for building steel structure according to claim 5, characterized in that: An upper loading plate (36) is also arranged in parallel on the main pressing plate (33), a plurality of spring struts (37) are connected between the upper loading plate (36) and the main pressing plate (33), and a pulse loading cylinder (38) is fixed on the positioning plate (31), the output end of the pulse loading cylinder (38) is connected to the upper loading plate (36).

7. A deformation performance detection device for building steel structure according to claim 1, characterized in that: The power loader (5) comprises: A fixed ring cylinder (51) having a shaft cylinder (52) rotatably arranged inside the cylinder via a bearing center, and the rotating shaft (44) is coaxially fixed on the shaft cylinder (52); A sealing liquid seat (53) is arranged below the fixed ring cylinder (51), and an oil inlet passage (54) and an oil outlet passage (55) are symmetrically distributed in the sealing liquid seat (53), and the oil inlet passage (54) and the oil outlet passage (55) are both connected to the fixed ring cylinder (51); Liquid plate racks, circumferentially distributed on the side wall of the shaft cylinder (52); The flow blocking blocks (56) are arranged corresponding to the liquid plate racks, and each of the flow blocking blocks (56) is fixed to the inner wall of the fixed ring cylinder (51).

8. A deformation performance detection device for building steel structure according to claim 7, characterized in that: A torsion spring is provided in the shaft cylinder (52), and the elastic force of the torsion spring causes the liquid plate frame on the shaft cylinder (52) to contact and cooperate with the flow blocking block (56); the liquid plate frame is composed of a plurality of leaf plates (6) arranged in an array, and the leaf plates (6) are fixed to each other via connecting rods (61).

9. The deformation performance detection device for building steel structure according to claim 7, characterized in that: Hydraulic oil is delivered to the oil inlet passage (54) by a high-pressure pump, and the hydraulic oil circulates in the fixed ring cylinder (51).

10. A method for detecting deformation performance of a building steel structure, which adopts a device for detecting deformation performance of a building steel structure as claimed in claim 6, characterized in that: It includes the following steps: S1. Preparation and pretreatment of I-beam samples: Select I-beams used in construction, clean and remove rust and scale on their surfaces to ensure that their size, shape and material meet the test standards; S2. Install and fix the sample, place the I-beam horizontally between the two loading seats (2), and control the two loading seats (2) to slide toward each other through the telescopic driving rod (12), so that the beam plate (46) on the steel plate frame (45) abuts against the end of the I-beam, and at this time, the transverse frame beam of the I-beam is mounted above the steel plate frame (45); S3. Loading and testing, preferably providing dynamic loads to both ends of the I-beam through the dynamic stress simulation unit on the loading seat (2); wherein, on the one hand, the loading cylinder (47) on each loading seat (2) can drive the power loader (5) to slide along the guide rail (42), so that the two ends of the I-beam can achieve torsional loading; on the other hand, the power loader (5) can perform dynamic bending stress loading on the I-beam; thereby simulating the load changes in the actual building structure; S4. Central pressure test, applying load to the middle of the I-beam through the main loading cylinder (35) and the pulse loading cylinder (38) in the pressure mechanism (3), gradually increasing the load from zero to the design load, monitoring and recording the deformation amount and corresponding load value at each stage, and observing and recording the deformation mode of the I-beam under different load levels; S5. Deformation performance data analysis: use the collected data to calculate the key mechanical performance indicators of the I-beam, such as elastic modulus, yield strength, and ultimate strength, analyze the deformation curve of the I-beam, and evaluate the toughness and stability of the I-beam.

Images