CN108181191B - Multi-node fatigue failure testing device for rigid beam column and concrete beam column - Google Patents
Multi-node fatigue failure testing device for rigid beam column and concrete beam column Download PDFInfo
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- CN108181191B CN108181191B CN201711223636.2A CN201711223636A CN108181191B CN 108181191 B CN108181191 B CN 108181191B CN 201711223636 A CN201711223636 A CN 201711223636A CN 108181191 B CN108181191 B CN 108181191B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
The invention discloses a multi-node fatigue failure test device for a rigid beam column and a concrete beam column, which comprises a steel frame system, an electro-hydraulic servo actuator, a test beam column and a test furnace, wherein the test beam column is placed in the test furnace, the steel frame system is arranged on the periphery of the test furnace, a horizontal fatigue load device, a vertical fatigue load device and a torsional fatigue load device are sequentially arranged between the steel frame system and the test beam column, the horizontal fatigue load device is arranged in the horizontal direction of the test beam column, the vertical fatigue load device is arranged in the vertical direction of the test beam column, and the torsional fatigue load device is arranged above the test beam column. The device can meet the requirement that the rigid beam column and the concrete beam column are subjected to eccentric tensile fatigue loads, the eccentricity can be set by the experimental requirements, the relative positions of the column cap and the test beam column are only required to be changed, and the device can also meet the requirements of ╋ type, T type, L type and other node fatigue failure test devices for the rigid beam column and the concrete beam column.
Description
Technical Field
The invention relates to the field of fire resistance of building structures, in particular to a multi-node fatigue failure testing device for a rigid beam column and a concrete beam column.
Background
In recent years, with the rapid development of national economy in China, China has built large-scale and numerous infrastructures such as subways, bridges, production plants and the like, in subway stations, locomotives pass on rails, and in subway stations, because most of structures are underground and have complex structures, the interaction between upper and lower iron rails also exists, so that large fatigue loads are generated, and also the fatigue loads of irregular side circulation are applied to bridge structures when automobiles run on bridges, and the fatigue loads are also generated to plant structures because of the use of large machines. And the subway station mostly adopts the structure of big span, and the structural style is also very complicated in order to satisfy needs, and the passenger flow is very big in the subway station, once the conflagration takes place and causes the node failure consequence beyond the scope of thinking, so to the node fatigue load research of subway station very important.
For example, in 18 th of 1987, a fire accident occurred at the junwang cross station of the metro in london, england, causing injury to a large number of people who died 31, and in 28 th of 1995, in 28 th of 1995, a fire accident occurred in the metro in the bank of the department of the capital in the department of the university in abebaijiang, causing injury to 265 people who died 289. Under the harsh accidents and the metro industry which is developing at a high speed in China, people in the fire research direction feel great mission, the importance of the nodes in engineering can be seen by specifying strong nodes and weak connection in the existing specification, the building structure of the metro station is subjected to severe fatigue load at ordinary times, the nodes are just connected with all bearing members, and the nodes are damaged under the action of fire, fatigue load and static load, so that whether the existing specification meets the design requirements or not is worthy of deep research.
Based on the previous research that the beam-column joint is divided by horizontal fatigue load, vertical fatigue load, torsional fatigue load and fire, the research on the multi-joint fatigue damage of the rigid beam-column and the concrete beam-column under the fire is particularly important.
Disclosure of Invention
In view of the above-described deficiencies of the prior art, the present invention provides a multi-node fatigue failure testing apparatus for a rigid beam column and a concrete beam column, which is capable of performing a fire test tensile fatigue test and a torsional fatigue failure test at the same time.
The technical scheme of the invention is as follows:
the utility model provides a rigidity beam column and concrete beam column multinode fatigue failure test device, wherein, including steel frame system, electric liquid servo actuator, experimental beam column and test stove, experimental beam column is placed inside experimental stove, the steel frame system arranges in experimental stove periphery, still be equipped with horizontal fatigue load device, vertical fatigue load device and twist reverse fatigue load device between steel frame system and the experimental beam column in proper order, horizontal fatigue load device arranges the horizontal direction at experimental beam column, vertical fatigue load device installs the vertical direction at experimental beam column, twist reverse the fatigue load device setting in the top of experimental beam column.
Rigid beam column and concrete beam column multinode fatigue failure test device, wherein, the steel frame system include reaction frame stand, steel frame crossbeam, steel frame stand and I word sloping, reaction frame stand is placed on test furnace both sides and with steel frame crossbeam overlap joint on steel frame stand, steel frame is with high strength bolt anchor to steel frame stand, I word sloping fusion welding is to steel frame stand, steel frame crossbeam fusion welding is to steel frame stand.
Rigid beam column and concrete beam column multinode fatigue failure test device, wherein, horizontal fatigue load device and vertical fatigue load device include electric liquid servo actuator, restraint girder steel, joint bearing piece and steel backing plate, the backing plate welds on steel frame just, electric liquid servo actuator installs on the steel frame crossbeam, electric liquid servo actuator is terminal to be connected with the restraint girder steel, the joint bearing piece is connected to restraint girder steel one end, the joint bearing piece is used for electric liquid servo actuator to the horizontal fatigue load of test beam column.
The multi-node fatigue failure testing device for the rigid beam column and the concrete beam column is characterized in that the torsional fatigue load device comprises a crank arm beam, a joint bearing block, a constraint steel beam and an electro-hydraulic servo actuator, the crank arm beam is composed of a steel pipe and a steel frame beam, the steel pipe is welded at the upper end of the steel frame beam, the length of the steel pipe is not shorter than the net length of the test beam column, a steel base plate is placed on the rigid ground, the constraint steel beam is placed on the electro-hydraulic servo actuator, and the joint bearing block is used for connecting the electro-hydraulic servo actuator and the steel frame beam.
Rigid beam column and concrete beam column multinode fatigue failure test device, wherein, fire test stove include reinforced concrete lateral wall, reinforced concrete top cap, heated board, temperature sensor, thermocouple, wire net, heat preservation, heating element, vent, supporting steel frame, temperature sensor and reinforced concrete lateral wall place in rigid ground, the vent sets up in reinforced concrete lateral wall below, the heat preservation pastes in reinforced concrete lateral wall inner wall, heating element sets up on the heat preservation, the thermocouple pastes and locates experimental beam column surface, the wire net is used for preventing that the concrete fragment from peeling off when the conflagration damages heating element, reinforced concrete top cap and heated board set up in the top of reinforced concrete lateral wall.
Rigid beam column and concrete beam column multinode fatigue failure test device, wherein, electro-hydraulic servo actuator include than abutment, displacement sensor, electro-hydraulic servo valve, piston rod, load sensor, rotatory packing ring, command signal, adjustment amplifier system, servo brake, oil source, loader, sensor, feedback system, connect on steel backing plate than abutment, realize that electro-hydraulic servo actuator does not receive steel frame system torsion action, displacement sensor, electro-hydraulic servo valve, piston rod, load sensor, rotatory packing ring are erection joint in proper order, command signal is used for adjusting amplifier system, servo brake, oil source, loader, sensor, feedback system.
Has the advantages that: compared with the prior art, the multi-node fatigue failure test device for the rigid beam column and the concrete beam column under the fire disaster firstly makes a test scheme, determines the eccentric size, the node type, the connection mode and the like of the researched beam column, then the beam column is placed in a fire test furnace, the hydraulic servo actuator is used for preloading, after all the structures are fully contacted, starting a power supply controller of the test furnace, heating the beam column joint according to a certain heating curve, possibly simulating the stress situation of an experimental research object under a real fire disaster, horizontal fatigue load, vertical fatigue load and torsional fatigue load are carried out on the beam column, meanwhile, the mechanical property of the steel bar material is reduced under the temperature change by combining experimental materials such as steel structural steel material, reinforced concrete material and reinforced concrete material, the joint failure mechanism is combined due to the change of the bonding property of various materials at high temperature and the like.
Drawings
Fig. 1 is a front plan view of a multi-node fatigue failure testing apparatus for a rigid beam column and a concrete beam column.
FIG. 2 is a front plan view of irregular side nodes of a multi-node fatigue failure testing device for a rigid beam column and a concrete beam column.
FIG. 3 is a detailed view of a fire test furnace of the multi-node fatigue failure test device for the rigid beam column and the concrete beam column.
FIG. 4 is a sectional view A-A of the multi-node fatigue failure testing apparatus for the rigid beam column and the concrete beam column.
FIG. 5 is a detailed view of a crank arm beam of the multi-node fatigue failure testing device for a rigid beam column and a concrete beam column.
FIG. 6 is a detailed view of the electro-hydraulic servo actuator of the multi-node fatigue failure testing device for the rigid beam column and the concrete beam column.
FIG. 7 is a detailed loading diagram of the electro-hydraulic servo actuator of the multi-node fatigue failure testing device for the rigid beam column and the concrete beam column.
FIG. 8 is a detail drawing of ╋ type node stress of a multi-node fatigue failure testing device for a rigid beam column and a concrete beam column.
FIG. 9 is a detailed stress diagram of T-shaped nodes of the multi-node fatigue failure testing device for the rigid beam column and the concrete beam column.
FIG. 10 is a detailed L-shaped node stress diagram of the multi-node fatigue failure testing device for the rigid beam column and the concrete beam column.
1-an electro-hydraulic servo actuator; 11-a lower pedestal; 12-a displacement sensor; 13-an electro-hydraulic servo valve; 14-a piston rod; 15-a load sensor; 16-a rotary washer; 17-a command signal; 18-adjusting the amplification system; 19-a servo gate; 110-a source of oil; 111-a loader; 112 a sensor; 113-a feedback system; 2-test furnace; 22-reinforced concrete side walls; 23-reinforced concrete roof cover; 26-a heat-insulating plate; 27-an electric box; 28-a power supply controller; 25-a temperature sensor; 24-a thermocouple; 211-steel wire mesh; 210-an insulating layer; 29-a heating element; 212-a vent; 3-a steel framework system; 31-reaction frame upright post; 4-horizontal fatigue loading device; 41-vertical fatigue loading device; 43-torsional fatigue loading device; 42-thick-walled square steel pipe; 51-a steel frame; 54-a restraining steel beam; 61-steel frame beam; 62-a crank arm beam; 63-a steel pipe; 7-a knuckle bearing block; 8-testing the beam column; 85-column cap; 91-a steel backing plate; 10-supporting a steel frame; 111-steel frame columns; 113-steel frame beam; 114-I shaped oblique beam.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Fig. 1 to 10 show a structural schematic diagram of a preferred embodiment of the invention, which is a multi-node fatigue failure testing device for a rigid beam column and a concrete beam column, and comprises a steel frame system 3, an electro-hydraulic servo actuator 1, a testing beam column 8 and a testing furnace 2, wherein the testing beam column 8 is placed inside the testing furnace 2, the steel frame system 3 is arranged at the periphery of the testing furnace, a horizontal fatigue loading device 4, a vertical fatigue loading device 41 and a torsional fatigue loading device 43 are further arranged between the steel frame system 3 and the testing beam column 8, the horizontal fatigue loading device 4 is arranged in the horizontal direction of the testing beam column 8, the vertical fatigue loading device 41 is arranged in the vertical direction of the testing beam column 8, and the torsional fatigue loading device 43 is arranged above the testing beam column 8.
With reference to fig. 1, 2, and 4, it is illustrated that the steel frame system 3 of the present embodiment includes two reaction frame columns 31 and two steel frame beams 113; three steel frames 51, two steel frame uprights 111; two I-shaped oblique beams 114. Two reaction frame upright columns 31 are placed on two sides of the test furnace 2, steel frame cross beams 113 are lapped on the two steel frame upright columns 111, three steel frames 51 are anchored on the two steel frame upright columns 111 through high-strength bolts, then the two steel frame upright columns 111 are placed on the ground with enough rigidity, two I-shaped oblique beams 114 are welded on the two steel frame upright columns 111 through welding, then one steel frame cross beam 113 is welded on the two steel frame upright columns 111 through welding to form a steel frame system, and if the steel frame 51 can be changed into a steel frame with a hemispherical lower end through irregular side node fatigue tests.
With reference to fig. 1, 4, 6, 8, 9 and 10, it is described that the horizontal fatigue loading device 4 and the vertical fatigue loading device 41 of the present embodiment include the restraint steel beam 54 of the electro-hydraulic servo actuator 1, the joint bearing block 7 and the steel backing plate 91, the steel backing plate 91 is welded to the steel frame 51 in the horizontal direction, then the electro-hydraulic servo actuator 1 is installed on the steel frame beam 111, the restraint steel beam 54 is connected to the end of the electro-hydraulic servo actuator 1, then the joint bearing block 7 is connected to one end of the restraint steel beam 54, and the joint bearing block 7 realizes only horizontal fatigue loading of the electro-hydraulic servo actuator 1 on the test beam column. The steel backing plate 91 is welded on the steel frame 51 in the vertical direction, then the electro-hydraulic servo actuator 1 is installed on the joint bearing block 7, and the joint bearing block 7 is placed on the steel backing plate 91 at the lower end. On the joint bearing piece 7 was installed to the electro-hydraulic servo actuator 1 again to steel frame 51 to steel backing plate 91 earlier in vertical direction, the lower extreme was put steel backing plate 91 on joint bearing piece 7, in order to satisfy irregular node, can also change steel frame 51 into the lower extreme and be the steel frame of hemisphere type, with bolted connection to electro-hydraulic servo actuator 1 on, can realize that the vertical fatigue load of arbitrary angle is used on the experimental beam column.
Referring to fig. 1, 4, 5, 6, 7, 8, 9 and 10, the torsional fatigue loading device 43 of the present embodiment is described as including a knuckle bearing block 7 of an arm beam 62 for restraining a steel beam 54 of an electro-hydraulic servo actuator 1, the arm beam having four steel pipes 63 and a steel frame beam 61, the length of the end of the four steel pipes 63 welded to the steel frame beam 61 is generally not shorter than the net length of a test beam column 8, a steel pad 91 is placed on a rigid ground, the electro-hydraulic servo actuator 1 is placed, the steel beam 54 is placed on the electro-hydraulic servo actuator 1, and the electro-hydraulic servo actuator 1 and the steel frame beam 61 are connected by the knuckle bearing block 7 to form the torsional fatigue loading experimental device 43.
Referring to fig. 1, it is described that the test furnace 2 of the present embodiment includes a reinforced concrete sidewall 22, a reinforced concrete top cover 23, a heat insulation board 26, an electric box 27, a power controller 28, a temperature sensor 25, a thermocouple 24, a steel mesh 211, a heat insulation layer 210, a heating element 29, a vent 212, and a support steel frame 10, the temperature sensor 25 is placed on a rigid ground while the support steel frame 10 is placed to construct the reinforced concrete sidewall 22 according to the experimental requirements, the vent 212 is arranged below the reinforced concrete wall and is attached to the heat insulation layer 210, the heating element 29 is arranged on the heat insulation layer 210, the steel mesh 211 is attached to the surface of the test beam column 8 to prevent concrete fragments from peeling off and damaging the heating element 29 in case of fire, then the electric box 27 and the power controller 28 are connected, and finally the reinforced concrete top cover 23 and the heat insulation board 26.
With reference to fig. 1, 8, 9, and 10, it is described that the test beam column 8 of the present embodiment includes a column cap 85, thick-wall square steel 42, and a steel backing plate 91, when the test beam column is poured, the column cap 85 is poured at the same time to connect the bolt embedded in advance in the column cap 85 to the knuckle bearing block 7, in order to implement the experimental apparatus for fatigue loads of different types of joints, the experimental apparatus may further connect the knuckle bearing block 7 with the thick-wall square steel 42 and the steel backing plate 91 to implement fatigue loads of different types of joints, and the test beam column 8 may be a reinforced concrete beam column or a rigid beam column, and finally, the gap between the steel pipe 63 and the column cap 85 and the reinforced concrete side wall 22 and the reinforced concrete top cover 23 of the test furnace is sealed with rock wool.
With reference to fig. 6 and 7, it is described that the electro-hydraulic servo actuator 1 of the present embodiment includes an comparison base 11, a displacement sensor 12, an electro-hydraulic servo valve 13, a piston rod 14, a load sensor 15, a rotary washer 16, a command signal 17, an adjusting amplification system 18, a servo gate 19, an oil source 110, a loader 111, a sensor 112, and a feedback system 113, where the comparison base 11 is connected to a steel backing plate 91 to prevent the electro-hydraulic servo actuator 1 from twisting by a steel frame system 3, then the piston rod 14 of the electro-hydraulic servo valve 13 of the displacement sensor 12 is sequentially mounted with the rotary washer 16 of the load sensor 15, and then connected to a constraint steel frame 54, and the command signal 17 is used to adjust the amplification system 18, the servo gate 19, the oil source 110, the loader 111, the sensor 112, and the feedback system 113 to realize that the electro-hydraulic servo actuator 1 works.
The invention relates to a multi-node fatigue failure test device for a rigid beam column and a concrete beam column under fire, which firstly makes a test scheme, determines the eccentric size, the node type, the connection mode and the like of the researched beam column, then the beam column is placed in a fire test furnace, the hydraulic servo actuator is used for preloading, after all the structures are fully contacted, starting a power supply controller of the test furnace, heating the beam column joint according to a certain heating curve, possibly simulating the stress situation of an experimental research object under a real fire disaster, horizontal fatigue load, vertical fatigue load and torsional fatigue load are carried out on the beam column, meanwhile, the mechanical property of the steel bar material is reduced under the temperature change by combining experimental materials such as steel structural steel material, reinforced concrete material and reinforced concrete material, the joint failure mechanism is combined due to the change of the bonding property of various materials at high temperature and the like.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the above teachings, and that all such modifications and variations are intended to be within the scope of the invention as defined in the appended claims.
Claims (4)
1. A multi-node fatigue failure test device for a rigid beam column and a concrete beam column is characterized by comprising a steel frame system, a test beam column and a test furnace, wherein the test beam column is placed inside the test furnace, the steel frame system is arranged on the periphery of the test furnace, a horizontal fatigue load device, a vertical fatigue load device and a torsional fatigue load device are further arranged between the steel frame system and the test beam column, the horizontal fatigue load device is arranged in the horizontal direction of the test beam column, the vertical fatigue load device is arranged in the vertical direction of the test beam column, and the torsional fatigue load device is arranged above the test beam column; the experimental furnace include reinforced concrete curb wall, reinforced concrete top cap, heated board, temperature sensor, thermocouple, wire net, heat preservation, heating element, vent, supporting steel frame, temperature sensor and reinforced concrete curb wall place in the rigidity subaerial, the vent sets up in reinforced concrete curb wall below, the heat preservation pastes in reinforced concrete curb wall inner wall, heating element sets up on the heat preservation, the thermocouple pastes and locates experimental beam column surface, the wire net is used for preventing that the concrete fragment from peeling off when the conflagration from damaging heating element, reinforced concrete top cap and heated board set up in the top of reinforced concrete curb wall.
2. The multi-node fatigue failure testing device for the rigid beam column and the concrete beam column according to claim 1, wherein the steel frame system comprises reaction frame columns, steel frame cross beams, steel frames, steel frame columns and I-shaped oblique beams, the reaction frame columns are placed on two sides of the testing furnace, the steel frame cross beams are lapped on the steel frame columns, the steel frames are anchored on the steel frame columns through high-strength bolts, the I-shaped oblique beams are welded on the steel frame columns in a welding mode, and the steel frame cross beams are welded on the steel frame columns in a welding mode.
3. The multi-node fatigue failure testing device for the steel beam column and the concrete beam column according to claim 2, wherein the horizontal fatigue loading device and the vertical fatigue loading device comprise electro-hydraulic servo actuators, constraint steel beams, joint bearing blocks and steel backing plates, the steel backing plates are welded on a steel frame, the electro-hydraulic servo actuators are installed on cross beams of the steel frame, the tail ends of the electro-hydraulic servo actuators are connected with the constraint steel beams, one ends of the constraint steel beams are connected with the joint bearing blocks, and the joint bearing blocks are used for horizontal fatigue loading of the electro-hydraulic servo actuators on the test beam column.
4. The multi-node fatigue failure testing device for the steel beam column and the concrete beam column as claimed in claim 3, wherein the torsional fatigue loading device comprises a crank arm beam, a joint bearing block, a constraint steel beam and an electro-hydraulic servo actuator, the crank arm beam is composed of a steel pipe and a steel frame beam, the steel pipe is welded at the upper end of the steel frame beam, the length of the steel pipe is not shorter than the net length of the test beam column, the steel base plate is placed on the rigid ground, the constraint steel beam is placed on the electro-hydraulic servo actuator, and the joint bearing block is used for connecting the electro-hydraulic servo actuator and the steel frame beam.
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| CN201711223636.2A CN108181191B (en) | 2017-11-29 | 2017-11-29 | Multi-node fatigue failure testing device for rigid beam column and concrete beam column |
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| CN201711223636.2A CN108181191B (en) | 2017-11-29 | 2017-11-29 | Multi-node fatigue failure testing device for rigid beam column and concrete beam column |
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| CN108181191B true CN108181191B (en) | 2020-07-07 |
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