CN109738178A - Wood-concrete combination beam shear connector push out test device and method under fire - Google Patents
Wood-concrete combination beam shear connector push out test device and method under fire Download PDFInfo
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- CN109738178A CN109738178A CN201910181127.0A CN201910181127A CN109738178A CN 109738178 A CN109738178 A CN 109738178A CN 201910181127 A CN201910181127 A CN 201910181127A CN 109738178 A CN109738178 A CN 109738178A
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Abstract
The present invention relates to wood-concrete combination beam shear connector push out test devices under building experimental rig technical field more particularly to a kind of fire, including fire furnace, for simulated fire scene；Self-balancing frame, for the fixed force application apparatus for releasing test specimen applied force to wood-concrete combination beam, and it is constant that wood-concrete combination beam release test specimen wooden frame position is limited in the force direction of force application apparatus, fixed wood-concrete combination beam is released test specimen and is exposed in the scene of fire that simulation is completed, and applies active force to concrete slab by force application apparatus and tests the sliding of connector.Through the invention can more true simulated fire condition carry out push out test, accurately study the performances such as wood-concrete combination beam shear connector force-mechanism, failure mode and shear-carrying capacity under fire.The present invention also provides a kind of wood under fire-concrete combination beam shear connector push out test test methods simultaneously.
Description
Technical field
The present invention relates to wood-concrete combination beam shearing resistances under building experimental rig technical field more particularly to a kind of fire
Connector push out test device and method.
Background technique
In recent years, major urban architecture and population are all more intensive, building fire hair with the acceleration of urbanization process
The weight of the height of raw frequency, loss is obvious to all, however reason on fire is more complicated and fire fighting difficulty is big.
Compared with traditional wooden frame, its strength and stiffness can be greatly improved using wood-concrete combination beam, but also can be with
Improve the sound insulation value and fire protecting performance of wooden frame structure, remarkable in economical benefits.But since timber is a kind of organic-biological material,
Have the shortcomings that it is flammable, under fire effect be easy by fire invasion cause structure to be destroyed, so as to cause casualties and wealth
Produce loss.In order to improve application of the wood-concrete combination beam in building structure, wood-concrete combination beam fire resistance is ground
Study carefully the emphasis for just becoming structure safe design.
Shear connector is to ensure that wooden frame and the cooperative important component of top concrete slab in combination beam, therefore to fire
The research of the performances such as wood-concrete combination beam shear connector force-mechanism, failure mode and shear-carrying capacity is outstanding under calamity
To be important, so this experimental rig and method are for the fire resistance of research building structure and component and how by reasonable
Effective measures have great significance to improve the fire resistance of structure and component.
However, in existing test, because being limited to experimental rig and test method, both at home and abroad to the mixed combination of wood-under fire
The push out test research of beam shear connector is less.Accurately study fire under wood-concrete combination beam shear connector by
The performances such as power mechanism, failure mode and shear-carrying capacity need to invent wood-concrete combination beam push out test under a kind of fire
Device and method provides foundation for wood-concrete combination beam resisting fire design.
In view of the above problems, the designer is based on being engaged in such product engineering application practical experience and profession abundant for many years
Knowledge, and cooperate the utilization of scientific principle, is actively subject to research and innovation, to found wood-concrete combination beam shearing resistance under a kind of fire
Connector push out test device and method makes it with more practicability.
Summary of the invention
In view of this, the present invention provides wood-concrete combination beam shear connector push out test device under a kind of fire, it can
More true simulated fire condition carries out push out test, accurately studies wood-concrete combination beam shear connections under fire
The performances such as force-mechanism, failure mode and the shear-carrying capacity of part.Wood-coagulation under a kind of fire is also provided in the present invention simultaneously
The test method of native combination beam shear connector push out test.
The technical solution that the present invention solves technical problem is as follows:
Wood-concrete combination beam shear connector push out test device under fire, comprising:
Fire furnace, for simulated fire scene；Further include self-balancing frame, test specimen is released to wood-concrete combination beam for fixed
The force application apparatus of applied force, and limit the wood-concrete combination beam in the force direction of the force application apparatus and release test specimen
Wooden frame position it is constant, the fixed wood-concrete combination beam is released test specimen and is exposed in the scene of fire that simulation is completed, and leads to
The force application apparatus is crossed to apply active force to the concrete slab and test the sliding of connector.
Further, further include that top frame is set a roof beam in place, be fixed on the fire furnace open-mouth, for the self-balancing frame into
Row support.
Further, the self-balancing frame includes rectangular frame, the rectangular frame inner chambers all standing and exceed institute
The open range of fire furnace is stated, and is split by steel plate to beyond part and covering part, the force application apparatus is located at institute
Self-balancing is stated to make somebody a mere figurehead within the scope of chamber and at the position beyond the fire furnace opening range.
Further, it is covered at the position that the opening is not covered by the concrete slab by cover board.
Further, the cover board is in the vertical overhead height far from the open direction lower than the concrete slab
Overhead height.
Further, end of the wooden frame in the force application apparatus force direction is covered entirely by the rectangular frame inner wall
Lid.
Further, further include anti-device of throwing, include at least limit beam, the both ends of the limit beam by it is described from
Balancing stand is fixed, and with the top frame set a roof beam in place between formed to the concrete slab carry out short transverse upper limit value space.
Further, the self-balancing frame, which is located at the position of the fire furnace exterior, is provided with seat structure, for
The fire furnace is jointly supported the self-balancing frame.
Further, the part that the self-balancing frame is at least exposed in the scene of fire is coated with refractory material.
Further, the output end of the force application apparatus is connect by pressure sensor with cushion block, and the cushion block is used for pair
The wood-concrete combination beam releases test specimen and uniformly exerts a force.
Wood-concrete combination beam shear connector push out test method under fire, comprising the following steps:
S1: fire hazard environment is established in simulation；
S2: the wood to complete-concrete combination beam is released into test specimen and is exposed in the fire hazard environment, while at least through institute
Wood-concrete combination beam release test specimen concrete slab is stated to close the fire hazard environment；
S3: the concrete slab is preloaded before ignition；
S4: after load reaches requirement, the fire hazard environment is opened, and heat up according to heating curve needed for test, while basis
The load of push out test requires to be further applied load；
S5: when test specimen destroys, stop working cooling and stopping load releasing examination at least through the wood-concrete combination beam is observed
The deformation of connector and damage -form obtain conclusion (of pressure testing) in part.
Beneficial effects of the present invention:
1, the lifting of self-balancing frame is convenient, does not need additional reaction rack equipment；
2, entire experimental rig is effectively prevented scurrying out for flame, increases the safety of fire test；
3, entire experimental rig can more truly simulated fire environment, and then more scientific is wood-concrete combination beam
Resisting fire design provides foundation；
4, entire experimental rig can study steel-concrete composite beam fire-resistance push out test, and applicability is wide.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is wood-concrete combination beam shear connector push out test device structural schematic diagram under fire；
Fig. 2 is wood-concrete combination beam shear connector push out test device top view under fire；
Fig. 3 is the cross-sectional view in Fig. 2 at A-A；
Fig. 4 is the cross-sectional view in Fig. 2 at B-B；
Fig. 5 is the sectional view of supporting block；
Fig. 6 is the scheme of installation of anti-device of throwing；
Fig. 7 is the top view of anti-device of throwing；
Fig. 8 is the cross-sectional view at anti-device of throwing；
Appended drawing reference:
1- fire furnace, 2- top frame are set a roof beam in place, 3- self-balancing frame, 31- rectangular frame, 32- steel plate, 33- cover board, 4- wood-concrete
Combination beam release test specimen, 41- wooden frame, 42- concrete slab, 5- force application apparatus, 6- seat structure, 7- pressure sensor, 8- cushion block,
9- supporting block, 91- groove, the anti-device of throwing of 10-, 101 limit beams, 102- connector.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Specific embodiments of the present invention are write in a progressive manner.
As shown in Fig. 1 ~ 4, wood-concrete combination beam shear connector push out test device under fire, comprising: fire furnace 1,
For simulated fire scene；Further include self-balancing frame 3, wood-concrete combination beam release 4 applied force of test specimen is applied for fixed
Power device 5, and limit wood-concrete combination beam in the force direction of force application apparatus 5 and release 41 position of wooden frame of test specimen 4 not
Become, fixed wood-concrete combination beam is released test specimen 4 and is exposed in the scene of fire that simulation is completed, by force application apparatus 5 to mixed
Concrete board 42 applies active force and tests the sliding of connector.
In the above-described embodiments, when wood-concrete combination beam shear connector push out test device work under fire, lead to
The position for crossing wooden frame 41 and force application apparatus 5 is constant, realizes the self-balancing of force and stress, i.e., in entire 3 range of self-balancing frame,
When the power that force application apparatus 5 exports is bigger, the power that concrete slab 42 is subject to is bigger, then can consolidate when stress reaches certain limiting value
The relative movement of position occurs for the concrete slab 42 under the wooden frame 41 and thrust that are arranged surely, so that being located at 41 He of wooden frame
Connector between concrete slab 42 more can really simulate fire by failure by shear, therefore by the simulation of fire hazard environment
Calamity condition carries out push out test, accurately studies wood-concrete combination beam shear connector force-mechanism under fire, destroys
The performances such as mode and shear-carrying capacity.
In the present embodiment, fire furnace 1 includes furnace inner wall masonry and furnace outer wall steel construction, and day is distributed in furnace inner wall masonry
Right feed channel, smokejack and comburent air duct, combustion fan are used for through comburent air duct to carrying out air supply in furnace,
Smoke exhaust fan is used to realize the output of flue gas by smokejack；There are multiple burners in fire furnace 1, it can be achieved that various temperature, and arranges
Cigarette blower, combustion fan and combustion gas are controlled by main valve, wherein in-furnace temperature can be realized by thermocouple and be measured, and operated
It is shown on panel, while may also display the burner opening time corresponding to the independent control of each temperature on operation panel,
The specific aperture etc. opened.In the present embodiment, fire furnace 1 is there are two types of temperature controlling mode, respectively manual temperature control and temperature automatically controlled,
In, to guarantee safety, when some burner breaks down and it is in automatic control, which can automatically exit from manual shape
State.
As the preferred of above-described embodiment, wood-concrete combination beam shear connector push out test device is also wrapped under fire
It includes top frame and sets a roof beam in place 2,1 open-mouth of fire furnace is fixed on, for being supported to self-balancing frame 3.In the present embodiment, such as Fig. 1 ~ 4
Shown, the opening of fire furnace 1 is located at top, and horizontally disposed, and top frame is set a roof beam in place 2 to be linked together with fire furnace 1, for steel construction class
Type, outside are wrapped up with fire resisting rock wool.Set a roof beam in place 2 setting of top frame can be protected and be supported to self-balancing frame 3, while pass through packet
The operation part reduction risk that operate can during the test is wrapped up in, guarantees the safety of personnel during entire test.
In the present embodiment, specifically, self-balancing frame 3 includes rectangular frame 31,31 inner chambers all standing of rectangular frame
And exceed the open range of fire furnace 1, and be split by steel plate 32 to beyond part and covering part, force application apparatus 5
In within the scope of 3 cavity of self-balancing frame and at the position beyond the open range of fire furnace 1.In this preferred embodiment, pass through steel plate 32
Setting, entire 31 inner chambers of rectangular frame are divided into two regions, it will be appreciated that in conflagration area and outside conflagration area, area
Experimental enviroment is provided for releasing test specimen 4 for wood-concrete combination beam in domain, is used to push away wood-concrete combination beam outside region
Test specimen 4 exerts a force out, can effectively ensure that the work of force application apparatus 5 is not kept accuracy by the influence of hot environment and obtains
Obtain longer service life.
As the preferred of above-described embodiment, as shown in Figure 1, end of the wooden frame 41 in 5 force direction of force application apparatus passes through
Rectangular frame 31 is limited, and guarantees the fixation of position by being fixedly connected with rectangular frame 31, and concrete slab 42 passes through company
Fitting is connect with the fixed wooden frame 41 completed, to realize the fixation on longitudinal direction as shown in the figure, realizes concrete slab 42
Bottom and 3 top of self-balancing frame are contour.Danger caused by scurrying out in order to avoid flare, while keeping in-furnace temperature, it is open not by
It is covered at the position that concrete slab 42 covers by cover board 33；Meanwhile in order to reduce cover board 33 to concrete slab 42 in deformation
Influence in journey, cover board 33 are lower than the overhead height of concrete slab 42 in the vertical overhead height far from open direction, thus
The contact area between the two, the accuracy of guarantee test are reduced as far as possible；End of the wooden frame 41 in 5 force direction of force application apparatus
End is by 31 inner wall all standing of rectangular frame, to guarantee the precision of its position limitation.
As the preferred of above-described embodiment, as shown in Fig. 6 ~ 8, further include anti-device 10 of throwing, include at least limit beam
101, the both ends of limit beam 101 are fixed by self-balancing frame 3, and set a roof beam in place with top frame and formed to the progress of concrete slab 42 between 2
The space of short transverse upper limit value.By the limit value in this space, so that applying active force to concrete slab 42 by force application apparatus 5
And during testing the sliding of connector, concrete slab 42 is limited in the space of fixed height, avoids and lifts
The case where turning over ensure that going on smoothly for test.Wherein, it in order to reduce the difficulty of installation, can be installed on self-balancing frame 3 first
The connector 102 of L-type then realizes the peace of anti-device of throwing by way of it will limit beam 101 and connector 102 and be installed
Dress can equally reduce the difficulty of processing of limit beam 101 through the above way.
It is certainly flat in order to guarantee wood under entire fire-concrete combination beam shear connector push out test device stability
Weighing apparatus frame 3, which is located at the position outside fire furnace 1, is provided with seat structure 6, for carrying out jointly to self-balancing frame 3 with fire furnace 1
Support, before the test, needs for entire self-balancing frame 3 to be fixedly connected in rear integral hoisting to fire furnace 1 with seat structure 6.
In order to guarantee the service life of self-balancing frame 3, the part that self-balancing frame 3 is at least exposed in scene of fire is coated with
Refractory material, in this preferred embodiment, the rectangular frame 31 of self-balancing frame 3 is welded by H profile steel, in order to guarantee the steady of structure
Qualitative, the settable ribs of right angle is reinforced.
Because the force application apparatus 5 in the present embodiment uses hydraulic jack, during its installation, as shown in figure 5, can lead to
It crosses the supporting block 9 positioned at 31 inside of rectangular frame and carries out longitudinal support, it, can be in supporting block 9 in order to guarantee the stability of support
On open up groove 91, to directly hydraulic jack is placed in groove 91, the shape of specific groove 91 and hydraulic thousand
The contour structures adaptability configuration on jin top, in order to which the force to force application apparatus 5 quantifies, output end (the i.e. liquid of force application apparatus 5
Press the piston rod end of jack) it is connect by pressure sensor 7 with cushion block 8, cushion block 8 is for pushing away wood-concrete combination beam
Test specimen 4 exerts a force out, wherein pressure sensor 7 can be used any practical type, cushion block 8 in the prior art and on the one hand increase
The force area for releasing test specimen 4 to wood-concrete combination beam is added, has guaranteed the stability of force, on the other hand can guarantee to press
The stability of power measurement squeeze by pressure sensor 7 acquisition of force value so that measurement result is accurate, can be more objective
Test result is evaluated.
Wood-concrete combination beam shear connector push out test method under fire, comprising the following steps:
S1: it needs to select suitable steel according to push out test release load and is welded into self-balancing frame 3, while simulating foundation fire
Calamity environment；One end (i.e. right side in Fig. 2) by taking self-balancing frame 3 in above-described embodiment as an example, by self-balancing frame 3 without seat structure 6
The top frame for being lifted on fire furnace 1 is set a roof beam in place 2 tops, has one end (i.e. in Fig. 2 left side) of seat structure 6 to be placed on fire test room
On ground, and one layer of fire resisting rock wool on the portion envelops that self-balancing frame 3 is contacted with fire；
S2: it lifts the wood-concrete combination beam to complete and releases test specimen 4, arrange thermocouple and displacement meter, connect measurement system
System, in fire hazard environment, simulation is true for the wooden frame 41 that wood-concrete combination beam is released test specimen 4 and 42 bottom-exposed of concrete slab
Real fire condition, at the same by wood-concrete combination beam release test specimen 4 concrete slab 42 and cover board 33 to fire hazard environment into
Row closing, wherein cover board 33 wraps up fire resisting rock wool；Hydraulic jack is installed at 3 left groove of self-balancing frame simultaneously, in test specimen
With installation pressure sensor 7 and cushion block 8 among hydraulic jack；
S3: concrete slab 42 is preloaded before ignition；
S4: after load reaches requirement, from the temperature and furnace pressure in (hand) dynamic control fire furnace 1, according to standard liter needed for test
Warm curve heating, is further applied load until destruction, tests load, sliding, temperature etc. according to the Protonation constant of push out test
Record；
S5: when test specimen destroys, stop working cooling and stopping load；When temperature is down to room temperature, open cover board 33, observation test specimen and
The features such as deformation, the damage -form of connector obtain conclusion (of pressure testing).
In conclusion self-balancing frame 3 solves the needs pair of the push out test under Fire Conditions in the above method of the present invention
The problem of loading device is constrained, and hydraulic jack mutually balances its counter-force with test test specimen to its counter-force.From
The steel plate 32 and two cover plates 33 that fire is kept off inside balancing stand 3 effectively prevent scurrying out for flame, ensure that testing crew and examination
Test the safety of equipment.Push out test of the steel-concrete composite beam under fire is carried out in high temperature furnace mostly, and it is of the invention
It is equally applicable to steel-concrete composite beam push out test research, therefore can more accurate simulation steel beam columns under fire condition-concrete combination beam
Fire-resistance push out test increases the applicability of experimental rig, and with lifting, convenient, highly-safe, simulation levels of precision is high, applicable
Under fire the features such as all kinds of combination beam pushs out test.
Basic principles and main features and advantage of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (10)
1. wood-concrete combination beam shear connector push out test device under fire characterized by comprising
Fire furnace (1), for simulated fire scene；Further include self-balancing frame (3), wood-concrete combination beam is pushed away for fixation
The force application apparatus (5) of test specimen (4) applied force out, and the wood-concrete is limited in the force direction of the force application apparatus (5)
Wooden frame (41) position that combination beam releases test specimen (4) is constant, and the fixed wood-concrete combination beam releases test specimen (4) exposure
In in the scene of fire that simulation is completed, active force is applied to the concrete slab (42) by the force application apparatus (5) and to even
The sliding of fitting is tested.
2. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 1
In further including that top frame is set a roof beam in place (2), be fixed on fire furnace (1) open-mouth, for propping up the self-balancing frame (3)
Support.
3. wood-concrete combination beam shear connector push out test device under fire according to claim 1 or 2, special
Sign is that the self-balancing frame (3) includes rectangular frame (31), rectangular frame (31) the inner chambers all standing and exceed institute
The open range of fire furnace (1) is stated, and is split by steel plate (32) to beyond part and covering part, the force application apparatus
(5) it is located within the scope of self-balancing frame (3) cavity and at the position beyond the open range of the fire furnace (1).
4. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 3
In the opening is not covered at the position of the concrete slab (42) covering by cover board (33).
5. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 4
In the cover board (33) is vertical high lower than the top of the concrete slab (42) far from the overhead height on the open direction
Degree.
6. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 2
In, further include it is anti-throw device (10), include at least limit beam (101), the both ends of limit beam (101) by it is described from
Balancing stand (3) is fixed, and sets a roof beam in place to be formed between (2) with the top frame and carry out the short transverse upper limit to the concrete slab (42)
The space of value.
7. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 3
In the self-balancing frame (3), which is located at the external position of the fire furnace (1), is provided with seat structure (6), is used for and the fire
Calamity furnace (1) is jointly supported the self-balancing frame (3).
8. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 3
In the part that the self-balancing frame (3) is at least exposed in the scene of fire is coated with refractory material.
9. wood-concrete combination beam shear connector push out test device, feature exist under fire according to claim 1
In the output end of the force application apparatus (5) is connect by pressure sensor (7) with cushion block (8), and the cushion block (8) is used for institute
It states wood-concrete combination beam and releases test specimen (4) uniformly force.
10. wood-concrete combination beam shear connector push out test method under fire, which comprises the following steps:
S1: fire hazard environment is established in simulation；
S2: releasing test specimen (4) for the wood to complete-concrete combination beam and be exposed in the fire hazard environment, while at least logical
The wood-concrete combination beam release test specimen (4) concrete slab (42) is crossed to close the fire hazard environment；
S3: the concrete slab (42) is preloaded before ignition；
S4: after load reaches requirement, the fire hazard environment is opened, and heat up according to heating curve needed for test, while basis
The load of push out test requires to be further applied load；
S5: when test specimen destroys, stop working cooling and stopping load releasing examination at least through the wood-concrete combination beam is observed
The deformation of connector and damage -form obtain conclusion (of pressure testing) in part (4).
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| CN110425884A (en) * | 2019-07-11 | 2019-11-08 | 中南大学 | Cooperative transformation resistance furnace suitable for three-dimensional frame structure fire test |
| CN112326461A (en) * | 2020-09-22 | 2021-02-05 | 河南大学 | Shear resistance test device for assembly type connecting piece |
| CN113108605A (en) * | 2021-05-12 | 2021-07-13 | 中国矿业大学 | Movable high-temperature coupling environment combined lifting furnace system |
| CN113514217A (en) * | 2021-06-04 | 2021-10-19 | 桂林理工大学 | Testing device and testing method for simulating impact on building structure in fire |
| CN114136810A (en) * | 2021-12-01 | 2022-03-04 | 华北理工大学 | Device for testing fireproof performance of T-shaped beam of hybrid fiber replacing reinforced concrete |
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