Fireproof performance testing and evaluating system for reinforced concrete structure

Abstract

The invention discloses a reinforced concrete structure fire resistance testing and evaluating system, and relates to the technical field of fire resistance testing, the reinforced concrete structure fire resistance testing and evaluating system comprises a base, the upper end face of which is fixedly provided with a bin body; the hydraulic cylinder is fixed on the bin body; the loading assembly is fixed at the output end of the hydraulic cylinder; the loading disc is fixed on the lower end face of the loading assembly, and a heat insulation disc is fixed on the lower end face of the loading disc; the heat insulation disc is sleeved with the protection barrel, and a plurality of sensors are installed in the protection barrel; the heating assembly is fixed on the base, and the heating assembly and the protective cylinder are coaxially arranged; buffering is provided when the test piece is heated to expand or deform, and the two stabilizing plates can be opened and closed through the linkage assembly, so that auxiliary clamping force is provided, and clamping stability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire resistance test, in particular to a reinforced concrete structure fire resistance performance test and evaluation system. BACKGROUND

[0002] The fire resistance performance of reinforced concrete structure is a key indicator for evaluating the safety of buildings. The traditional fire resistance performance test usually adopts a simple furnace heating and hydraulic jack axial load applying mode. The existing test system has a single loading mode, most of the test furnaces can only provide unidirectional loading, cannot simulate the twisted compression state of the actual structure, the test results deviate greatly from the actual situation, and the mechanism compatibility is poor, a set of equipment can only test the test pieces of specific size or type, the universality is low, the equipment utilization rate is not high, and the combined frame structure such as beam column, beam floor and the like cannot be adjusted accordingly.

[0003] In view of the above problems, the present application provides a reinforced concrete structure fire resistance performance test and evaluation system to solve the above problems. SUMMARY

[0004] To achieve the above purpose, the present application provides the following technical scheme: a reinforced concrete structure fire resistance performance test and evaluation system, comprising: a base, the upper end face of which is fixed with a bin body; a hydraulic cylinder fixed on the bin body; a loading assembly fixed on the output end of the hydraulic cylinder; a loading disc fixed on the lower end face of the loading assembly, and the lower end face of the loading disc is fixed with a heat insulation disc; a protective cylinder is sleeved on the heat insulation disc, and a plurality of sensors are installed in the protective cylinder; a heating assembly is fixed on the base and coaxially arranged with the protective cylinder.

[0005] Preferably, the loading assembly comprises: a connecting disc fixed on the output end of the hydraulic cylinder; a plurality of reset cylinders are circumferentially and obliquely arranged on the lower end face of the connecting disc, and a torsion spring one is installed in each reset cylinder; a torsion link is hingedly connected to one end of the reset cylinder and connected with the torsion spring one, and the swing trajectories of the plurality of torsion links are arc trajectories; a connecting piece is hingedly connected to the other end of the torsion link, and a torsion spring two is installed at the hinged position, and the plurality of connecting pieces are fixed on the upper end face of the loading disc.

[0006] Preferably, the heating assembly comprises: a fixed disc fixed in the base; a plurality of combustion box bodies are circumferentially arranged in the fixed disc; a combustion head is fixed at the axial position of the fixed disc and communicates with the plurality of combustion box bodies through a plurality of hoses; four linear motors are circumferentially arranged in the fixed disc; a clamping assembly is fixed on the output end of the linear motor.

[0007] Preferably, the clamping assembly comprises: a clamping plate fixed at the output end of the linear motor; a clamping column slidingly arranged at the middle position of the clamping plate; two pre-tightening columns symmetrically slidingly arranged at the two ends of the clamping column and provided with pre-tightening springs between the clamping column; two stable plates symmetrically hinged on the clamping plate and located at the two sides of the clamping column; and two linkage assemblies symmetrically installed between the clamping column and the stable plates.

[0008] Preferably, a position-avoiding groove is formed in the middle of the clamping plate, a sliding groove is formed at the middle position of the position-avoiding groove, a limiting plate is fixed at the middle position of the sliding groove, the clamping column is slidingly arranged on the sliding groove and the limiting plate, and hinged columns are symmetrically fixed at the two sides of the position-avoiding groove.

[0009] Preferably, a limiting groove is formed at the corresponding position of the middle of the clamping column and the limiting plate, a flexible surface is formed at the side of the two ends of the stable plate close to the clamping column, and the initial state of the two stable plates is parallel to the clamping column.

[0010] Preferably, the linkage assembly comprises: a connecting rod hinged at one end on the clamping column; and a sliding block slidingly arranged in the stable plate and hinged at the other end with the connecting rod; wherein guide columns are symmetrically fixed at the two sides of the sliding block, and return springs are sleeved on the guide columns.

[0011] Preferably, the elasticity of the return spring is smaller than that of the pre-tightening spring.

[0012] Compared with the prior art, the steel reinforced concrete structure fire resistance performance test evaluation system has the following beneficial effects: in the present application, the multiple circumferentially arranged return cylinders and torsion connecting rods of the loading assembly, in cooperation with torsion spring one and torsion spring two, allow the loading disc to be twisted in addition to the vertical main loading direction, thereby exerting double force, so that the system can simulate the compression and distortion of structural members due to concrete explosion, steel yield, uneven heating and other reasons in actual fire, greatly improving the reliability of the test results, and the four linear motor driven clamping assemblies can move synchronously or independently, flexibly adjusting the clamping space, thereby being compatible with column, beam and other test pieces of different cross-sectional sizes (square, rectangular, circular), and adjusting the internal clamping or external clamping, and providing initial clamping force through the pre-tightening spring when clamping, providing buffering when the test piece expands or deforms, and enabling the two stable plates to open and close through the linkage assembly, thereby providing auxiliary clamping force, improving the stability of clamping. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an overall structure schematic diagram of the steel reinforced concrete structure fire resistance performance test evaluation system.

[0014] Figure 2 Loading assembly schematic diagram of the steel reinforced concrete structure fire resistance performance test evaluation system;

[0015] Figure 3 Heating assembly structure schematic diagram of the steel reinforced concrete structure fire resistance performance test evaluation system;

[0016] Figure 4 Clamping plate structure schematic diagram of the steel reinforced concrete structure fire resistance performance test evaluation system;

[0017] Figure 5 Clamping assembly structure schematic diagram of the steel reinforced concrete structure fire resistance performance test evaluation system;

[0018] In the figure: 1, base; 2, hydraulic cylinder; 3, loading assembly; 4, loading disc; 5, protective cylinder; 6, heating assembly; 31, connecting disc; 32, reset cylinder; 33, torsion connecting rod; 34, connecting piece; 41, heat insulation disc; 61, fixed disc; 62, combustion box body; 63, pipeline; 64, combustion head; 65, clamping assembly; 66, linear motor; 651, clamping plate; 6511, avoidance groove; 6512, sliding groove; 6513, limiting plate; 6514, hinged column; 652, clamping column; 6521, limiting groove; 653, pre-tightening column; 654, connecting rod; 655, stabilizing plate; 6551, flexible surface; 656, sliding block; 6561, guide column; 6562, reset spring. DETAILED DESCRIPTION

[0019] Reference Figures 1-5 The application provides a technical scheme: a steel reinforced concrete structure fire resistance performance test evaluation system, comprising: a base 1, the upper end face of which is fixed with a warehouse body (not shown in the figure); a hydraulic cylinder 2, which is fixed on the warehouse body; a loading assembly 3, which is fixed on the output end of the hydraulic cylinder 2; a loading disc 4, which is fixed on the lower end face of the loading assembly 3, and the lower end face of the loading disc 4 is fixed with a heat insulation disc 41; a protective cylinder 5, which is sleeved on the heat insulation disc 41, and a plurality of sensors are installed in the protective cylinder 5; a heating assembly 6, which is fixed on the base 1 and coaxially arranged with the protective cylinder 5.

[0020] It should be noted that the types of the plurality of sensors are multiple, at least including temperature sensors and visual sensors, which are used to sense the temperature change in the protective cylinder 5 and the deformation condition of the steel reinforced concrete structure, so as to monitor the temperature field distribution, deformation, strain and other key data of the test piece under high temperature in multiple positions.

[0021] In the embodiment, the loading assembly 3 comprises: a connecting disc 31 fixed at the output end of the hydraulic cylinder 2; a plurality of reset cylinders 32 circumferentially arranged on the lower end surface of the connecting disc 31, and a torsion spring I is arranged in the reset cylinders 32; a torsion connecting rod 33 hingedly connected to one end of the reset cylinders 32 and connected to the torsion spring I, and the swing track of the plurality of torsion connecting rods 33 is an arc track; a connecting piece 34 hingedly connected to the other end of the torsion connecting rod 33, and a torsion spring II is arranged at the hinged position, and the plurality of connecting pieces 34 are fixed on the upper end surface of the loading disc 4.

[0022] That is, through the plurality of circumferentially arranged reset cylinders 32 and torsion connecting rods 33 of the loading assembly 3, cooperating with the torsion spring I and the torsion spring II, the loading disc 4 can be twisted in addition to the vertical main loading direction, thereby exerting double gravity, so that the system can simulate the compression and distortion of the structural member caused by the explosion of concrete, the yield of steel bars, and uneven heating in actual fire, thereby greatly improving the reliability of the test results.

[0023] In the embodiment, the heating assembly 6 comprises: a fixed disc 61 fixed in the base 1; a plurality of combustion box bodies 62 circumferentially arranged in the fixed disc 61; a combustion head 64 fixed at the center of the fixed disc 61 and communicating with the plurality of combustion box bodies 62 through a plurality of pipelines 63; four linear motors 66 circumferentially arranged in the fixed disc 61; and a clamping assembly 65 fixed at the output end of the linear motor 66.

[0024] It should be noted that the plurality of combustion box bodies 62 can be used synchronously or individually, so that the heating demand can be adjusted to complete the preset standard temperature rise curve and heating time.

[0025] As a preferred embodiment, the clamping assembly 65 comprises: a clamping plate 651 fixed at the output end of the linear motor 66; a clamping column 652 slidingly arranged at the middle position of the clamping plate 651; two pre-tightening columns 653 symmetrically slidingly arranged at both ends of the clamping column 652 and provided with a pre-tightening spring between the clamping column 652; two stabilizing plates 655 symmetrically hingedly connected to the clamping plate 651 and located at both sides of the clamping column 652; and two linkage assemblies symmetrically arranged between the clamping column 652 and the stabilizing plates 655.

[0026] The four linear motors 66 drive the clamping assembly 65 to move synchronously or independently, flexibly adjust the clamping space, and thus be compatible with test pieces of different cross-sectional sizes (square, rectangular, circular) such as columns and beams, and adjust the inner clamping or outer clamping. When the size of the combined frame is large, the inner clamping is selected, and when the size is small, the outer clamping is selected, thereby improving the versatility of clamping, and providing an initial clamping force by the pre-tightening spring during clamping, and providing a buffer when the test piece expands or deforms due to heat.

[0027] As a preferred embodiment, a position-avoiding groove 6511 is formed in the middle of the clamping plate 651, a sliding groove 6512 is formed in the middle of the position-avoiding groove 6511, a limiting plate 6513 is fixed in the middle of the sliding groove 6512, the clamping column 652 is slidingly arranged on the sliding groove 6512 and the limiting plate 6513, and a hinge column 6514 is symmetrically fixed on both sides of the position-avoiding groove 6511.

[0028] As a preferred embodiment, a limiting groove 6521 is formed in the middle of the clamping column 652 and the corresponding position of the limiting plate 6513, a flexible surface 6551 is formed on one side of the clamping column 652 close to the two ends of the stable plate 655, and the initial state of the two stable plates 655 is parallel to the clamping column 652.

[0029] As a preferred embodiment, the linkage assembly comprises a connecting rod 654 hingedly connected to one end of the clamping column 652, and a sliding block 656 slidingly arranged in the stable plate 655 and hingedly connected to the other end of the connecting rod 654, wherein guide columns 6561 are symmetrically fixed on both sides of the sliding block 656, and return springs 6562 are sleeved on the guide columns 6561.

[0030] That is, when clamping, the pre-tightening column 653 first contacts the test piece, then pushes the clamping column 652 to slide, the clamping column 652 drives the connecting rod 654 to make the connecting rod 654 pull the sliding block 656 to slide, thereby making the stable plate 655 unfold and rotate to increase the clamping range of the test piece. When the clamping column 652 slides to the limit (the limiting groove 6521 is limited by the limiting plate 6513), the pre-tightening column 653 is pre-tightened by the pre-tightening spring at this time, and the stable plate 655 provides an auxiliary clamping force inwardly closed by the return spring 6562, thereby improving the clamping stability.

[0031] As a preferred embodiment, the elasticity of the return spring 6562 is smaller than that of the pre-tightening spring.

[0032] In specific implementation, the protective cylinder 5 is lifted through the heat insulation disc 41 by the hydraulic cylinder 2, then the combined frame is placed on the fixed disc 61, and the different shaped combined frames are internally clamped or externally clamped by the clamping assembly 65, then the protective cylinder 5 is made to fall on the fixed disc 61 by the extension of the hydraulic cylinder 2, to form an isolated test chamber, and the combined frame is monitored in real time by various different sensors in the protective cylinder 5, then the combustion head 64 is made to combust by the plurality of combustion boxes 62, to simulate the fire temperature, when the temperature reaches the preset, the loading assembly 3 is driven by the hydraulic cylinder 2 to load, to exert dual forces of twisting and pressing on the combined frame, to improve the accuracy of the test results, and data is collected by various different sensors to complete the test.

[0033] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art, according to the technical solution and the inventive concept of the present application, within the technical range disclosed by the present application, makes equivalent replacement or change, should be covered within the protection scope of the present application.

Claims

1. A system for testing and evaluating the fire resistance of a reinforced concrete structure, characterized in that, Include: Base (1), the upper end face of which is fixed with a bin body; Hydraulic cylinder (2), fixed on the bin body; Loading assembly (3), fixed on the output end of the hydraulic cylinder (2); Loading disc (4), fixed on the lower end face of the loading assembly (3), and the lower end face of the loading disc (4) is fixed with a heat insulation disc (41); Protective cylinder (5), sleeved on the heat insulation disc (41), and a plurality of inductors are installed in the interior of the protective cylinder (5); Heating assembly (6), fixed on the base (1), and coaxially arranged with the protective cylinder (5).

2. The reinforced concrete structure fire resistance performance test evaluation system according to claim 1, characterized by, The loading assembly (3) comprises: Connecting disc (31), fixed on the output end of the hydraulic cylinder (2); Reset cylinder (32), configured as a plurality, circumferentially inclined arranged on the lower end face of the connecting disc (31), and a torsion spring I is installed in the interior thereof; Torsion connecting rod (33), one end hinged in the reset cylinder (32), and connected with the torsion spring I, the swing track of a plurality of the torsion connecting rods (33) is an arc track; Connecting piece (34), hinged on the other end of the torsion connecting rod (33), and a torsion spring II is installed at the hinged position, and a plurality of the connecting pieces (34) are fixed on the upper end face of the loading disc (4).

3. The reinforced concrete structure fire resistance performance test evaluation system according to claim 1, characterized by, The heating assembly (6) comprises: Fixed disc (61), fixed in the base (1); Combustion box body (62), configured as a plurality, circumferentially arranged in the fixed disc (61); Combustion head (64), fixed at the axial position of the fixed disc (61), and a plurality of hoses (63) are communicated with a plurality of the combustion box bodies (62); Linear motor (66), configured as four, circumferentially arranged in the fixed disc (61); Clamping assembly (65), fixed on the output end of the linear motor (66).

4. The reinforced concrete structure fire resistance performance test evaluation system according to claim 3, characterized by, The clamping assembly (65) comprises: Clamping plate (651), fixed on the output end of the linear motor (66); Clamping column (652), slidingly arranged at the middle position of the clamping plate (651); Pre-tightening column (653), configured as two, symmetrically slidingly arranged at both ends of the clamping column (652), and a pre-tightening spring is arranged between the clamping column (652) and the pre-tightening column (653); Stable plate (655), configured as two, symmetrically hinged on the clamping plate (651), and located at both sides of the clamping column (652); Linkage assembly, configured as two, symmetrically installed between the clamping column (652) and the stable plate (655).

5. The reinforced concrete structure fire resistance performance test evaluation system according to claim 4, characterized by, The middle of the clamping plate (651) is provided with an avoidance slot (6511), the middle of the avoidance slot (6511) is provided with a sliding slot (6512), the middle of the sliding slot (6512) is fixed with a limiting plate (6513), the clamping column (652) is slidingly arranged on the sliding slot (6512) and the limiting plate (6513), and the two sides of the avoidance slot (6511) are symmetrically fixed with hinged columns (6514).

6. The reinforced concrete structure fire resistance performance test evaluation system according to claim 5, characterized by, A limiting slot (6521) is arranged in the middle of the clamping column (652) and the corresponding position of the limiting plate (6513), a flexible surface (6551) is arranged on the side of the two ends of the stable plate (655) close to the clamping column (652), and the initial state of the two stable plates (655) is parallel to the clamping column (652).

7. The reinforced concrete structure fire resistance performance test evaluation system according to claim 6, characterized by, The linkage assembly comprises: A connecting rod (654) is hingedly connected to the clamping column (652); A sliding block (656) is slidingly arranged in the stable plate (655) and is hingedly connected to the other end of the connecting rod (654); Wherein, the two sides of the sliding block (656) are symmetrically fixed with guide columns (6561), and the guide columns (6561) are all sleeved with return springs (6562).

8. The reinforced concrete structure fire resistance performance test evaluation system according to claim 7, characterized by, The elasticity of the return spring (6562) is smaller than that of the pre-tightening spring.

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