CN107884262A - Punching, shearing and the fatigue to failure test device of reinforced concrete on fire floor - Google Patents
Punching, shearing and the fatigue to failure test device of reinforced concrete on fire floor Download PDFInfo
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- CN107884262A CN107884262A CN201711024791.1A CN201711024791A CN107884262A CN 107884262 A CN107884262 A CN 107884262A CN 201711024791 A CN201711024791 A CN 201711024791A CN 107884262 A CN107884262 A CN 107884262A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
A kind of punching of reinforced concrete on fire floor, shearing and fatigue to failure test device, including steel frame system, breadboard and trial furnace, breadboard is positioned over above trial furnace, steel frame system is arranged in trial furnace periphery, shear, blanking units and fatigue load device are also provided between steel frame system and breadboard, shear is arranged in the horizontal direction of breadboard, and blanking units are arranged on the middle part of the vertical direction of breadboard, and fatigue load device is arranged on breadboard top.The present invention can study the punching suffered by concrete floor in the case of natural fire, shearing and fatigue rupture.
Description
Technical field
The present invention relates to a kind of experimental rig of reinforced concrete on fire plate, especially a kind of reinforced concrete on fire
Punching, shearing and the fatigue to failure test device of floor, belong to building structure fire-resistance field.
Background technology
In recent years, China is in rapid economic development period, and annual billions of square metres building is constantly built up, wherein
Armoured concrete slab is most important Horizontal load-bearing component, generally should in tier building, skyscraper and high-rise building
With.In fire, reinforced concrete floor directly bears S.I biogas engine, and because thickness of slab is smaller, cover to reinforcement is relatively thin, when causing fire
Reinforced concrete floor is that fire area is maximum, damages one of component of most serious, is more weak in total fire-resistance
Link.
And it is subjected to the plane of structure for this structure formed with post and plate in underground parking, armoured concrete slab
External load, the effect of horizontal subdivision, also play an important roll in terms of the bearing capacity and integral rigidity of building structure is ensured.So
The punching and shearing test for studying fire lower plate are necessary, and damage of the reloading to armoured concrete slab
Especially severe, so the design of armoured concrete slab will consider the influence of many environmental factors and disaster, as burn into is severe
Temperature conditionss and fire etc., the influence of fire are one of factors that armoured concrete slab design needs emphasis consideration.When indoor fire
After calamity flashes over, armoured concrete slab will also prevent fire spreading to a upper floor in addition to the effect for itself bearing high temperature.Steel
Bar concrete floor will also prevent floor from being collapsed in fire with concrete on fire as Horizontal load-bearing component.Therefore, floor
Fire resistance is most important to the security for maintaining monolithic architecture structure under fire.Fire is found in actual fire and fire test
Larger amount of deflection can occur for concrete floor during calamity, but structure is overall and floor remains to keep stability in itself, will not send out mostly
Life is caved in.Reason is plate interior generation tension membrane action during large deformation, and it undertakes the load on floor, so as to greatly improve plate
Fire resistance.
Based on research punching before, shearing and fatigue rupture and the mutual separated research of fire, therefore, fire is studied
The punching of lower reinforced concrete floor, shearing and fatigue to failure test particularly important.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, the present invention provide a kind of punching of reinforced concrete on fire floor,
Shearing and fatigue to failure test device, the experimental rig can carry out fire test punching, shearing and fatigue to failure test simultaneously.
The present invention solves the technical scheme that its technical problem uses：Including steel frame system, breadboard and trial furnace, examination
Test plate to be positioned over above trial furnace, steel frame system is arranged in trial furnace periphery, between steel frame system and breadboard still
Provided with shear, blanking units and fatigue load device, shear is arranged in the horizontal direction of breadboard, blanking units peace
Mounted in the middle part of the vertical direction of breadboard, fatigue load device is arranged on breadboard top.
Compared with prior art, punching, shearing and the fatigue to failure test dress of reinforced concrete on fire floor of the invention
Put, be to carry out preloading after entire infrastructure fully contacts, by specific temperature heating curve, light trial furnace, control temperature
Load simultaneously controlled loading speed and time using shear, blanking units and fatigue load device while curve.This
Concrete Subjected To Fire floor can be punched by sample, and shearing and the influence of fatigue load and the temperature due to concrete floor become
Change, concrete material performance, bar material hydraulic performance decline, ultimately result in the punching of concrete floor, shearing and fatigue rupture machine
Reason is combined, and is studied the punching of concrete floor in the case of natural fire, shearing and fatigue to failure test device, is that fire is gone downstairs
Plate is punched, and shearing and fatigue to failure test category are pioneering.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is that concrete floor plate of the present invention is punched in case of fire, and the D-D of shearing and fatigue to failure test device is cutd open
Face figure.
Fig. 2 concrete floor plates of the present invention are punched in case of fire, shear and the A-A sections of fatigue to failure test device
Figure.
Fig. 3 concrete floor plates of the present invention are punched in case of fire, shear and the C-C sections of fatigue to failure test device
Figure.
Fig. 4 concrete floor plates of the present invention are punched in case of fire, shear and the B-B sections of fatigue to failure test device
Figure.
Fig. 5 concrete floor plates of the present invention are punched in case of fire, shear and the E-E sections of fatigue to failure test device
Figure.
Fig. 6 concrete floor plates of the present invention are punched in case of fire, shear and the steel frame of fatigue to failure test device
And bearing detail drawing.
Fig. 7 concrete floor plates of the present invention are punched in case of fire, shearing and the self-control of fatigue to failure test device fire
Calamity trial furnace internal details.
Fig. 8 concrete floor plates of the present invention are punched in case of fire, shearing and fatigue to failure test device fatigue load
Device detail drawing.
Fig. 9 concrete floor plates of the present invention are punched in case of fire, and shearing is detailed with fatigue to failure test shear
Figure.
Figure 10 concrete floor plates of the present invention are punched in case of fire, shearing and fatigue to failure test punching rectangle steel drum
The detail drawing of device.
In figure, 1, steel frame system, 1.1,1.2,1.3,1.4, reaction frame column, 2.1,2.2,2.3,2.4, reaction frame
Beam in length and breadth, 3.1,3.2,3.3,3.4,3.5,3.6,3.7, steel frame beam in length and breadth, 4, shear, 4.1, hinged pedestal, 4.2,
Displacement transducer, 4.3, actuator, 4.4, weighing sensor, 4.5, detachable and have the steel knot tying of handle, 4.6 main transmission rods,
4.7th, U-shaped steel plate, 4.8, length-adjustable shearing power transmission steel plate, 4.9, steel bar, 5, fatigue load device, 5.1, variable-frequency electric
Machine, 5.2, off-axis runner, 5.3, spring, 5.4, fire-resistant rubber rod, 6.1,6.2, punching transmission rod, 6.3, transmission rod, 7.1,
7.2nd, 7.3, stirrup, 7.4, rectangle steel drum, 8, punching actuator, 9.1,9.2, steel frame, 10, steel spin, 10.1, ball pivot branch
Seat, 10.2, steel roller bearing, 11.1,11.2, I font beams, 11.3,11.4, T font beams, 12, trial furnace, 12.1, armored concrete
Post, 12.2, armored concrete fire wall, 12.3, reinforced beam, 12.4, nozzle, 13, breadboard, 14, furnace bottom, 15, side
Steel pipe, 16.1, billet.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to protection scope of the present invention.
Fig. 1 to Figure 10 shows the structural representation of a preferred embodiment of the invention, a kind of steel beam columns under fire condition in figure
Punching, shearing and the fatigue to failure test device of bar concrete floor, including steel frame system 1, breadboard 13 and trial furnace 12,
Breadboard 13 is positioned over above trial furnace 12, and steel frame system 1 is arranged in the periphery of trial furnace 12, in steel frame system 1 and experiment
Shear 4, blanking units and fatigue load device 5 are also provided between plate 13, shear 4 is arranged in the water of breadboard 13
The middle part of the vertical direction of breadboard 13 square is arranged on to, blanking units, fatigue load device 5 is arranged on breadboard 13
Portion.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, illustrate the structure of present embodiment steel frame system 1, it includes four counter-forces
Erect post 1.1；1.2；1.3；1.4th, four reaction frames beam 2.1 in length and breadth；2.2； 2.3；2.4 and seven steel frames beam in length and breadth
3.1；3.2；3.3；3.4；3.5；3.6；3.7；Four reaction frame columns 1.1；1.2；1.3；1.4 be located at experimental rig four turn
Angle, reaction frame upright horizontal are respectively equipped with three steel frame crossbeams 3.2 to upper end both sides and centre position；3.3；3.1, counter-force erects
Post longitudinal direction upper end both sides and middle two steel frame longerons 3.6 of setting respectively；3.7；3.4；3.5, counter-force trestle lower end is vertically and horizontally
Provided with four reaction frames beam 2.1 in length and breadth；2.2；2.3；2.4, so as to form the main frame as experiment of an entirety.
With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 9, illustrate present embodiment, shear 4 includes hinge
Branch pedestal 4.1, displacement transducer 4.2, actuator 4.3, weighing sensor 4.4, steel knot tying 4.5 that is detachable and having handle, master
Transmission rod 4.6, U-shaped steel plate 4.7, length-adjustable shearing power transmission steel plate 4.8 and 4 steel bars 4.9, shearing power transmission steel plate 4.8
If it is preferential from the small titanium alloy of deformation or more preferable material to have ready conditions, a shear 4 positioned at the side of breadboard 13：
One end connection shearing power transmission steel plate 4.8 of main transmission rod 4.6, other end connection steel knot tying 4.5, weighing sensor 4.4 and start
Device 4.3 is connected on displacement transducer 4.2, and hinged pedestal 4.1 anchors to steel frame longeron 3.6 by long bolt and steel bar 4.9
On, in order to allow shear load only to apply the shearing force of vertical panel to plate, be finally already connected to two together with screw rod
Integral fastening to together, main transmission rod 4.6 is fixed on steel frame longeron 3.4 with U-shaped steel plate 4.7；Positioned at breadboard 13
Also as above step connects in place two shears 4 of opposite side, the square steel tube 15 1 welded together with two thickness differences
Hold the lateral displacement of restriction plate but be not intended to limit the plane outer displacement of plate, one end is anchored at steel frame crossbeam 3.2 with bolt respectively
On steel frame crossbeam 3.3.Present embodiment includes the three main one end of transmission rod 4.6 connections can be with the shearing power transmission of adjustment length
If steel plate 4.8 is had ready conditions, preferential select deforms small titanium alloy or more preferable material, and one end connection is detachable and has handle
Steel knot tying 4.5, then weighing sensor 4.4 and actuator 4.3 are connected on displacement transducer 4.2, compared with branch pedestal 4.1
Anchored to long bolt and steel bar 4.9 on steel frame longeron 3.6, in order to allow shear load only to apply vertical panel to plate
Shearing force, finally transmission rod is fixed with U-shaped steel plate 4.7 to together with the integral fastening that two are already connected to together by screw rod
On steel frame longeron 3.4.Breadboard 13 put experiment needed for evenly load, it is necessary to evenly load can be by sandbag and steel plate
Composition；Breadboard uses steel spin 10 and ball hinged support 10.1 13 times, to prevent breadboard from sliding, in breadboard 13 adjacent two
The centre position on side sets one and the mutually level steel roller bearing 10.2 of steel ball 10 respectively.With alumina silicate fiber felt by breadboard with
Gap plugging between trial furnace is tight, is under breadboard 13 with the guarantee test plate 13 of steel frame 9.2 under rigidity basis, bottom
It is self-control trial furnace 12, the side of trial furnace 12 4 is made up of reinforced column 12.1 and beam 12.3, and inner side builds armored concrete by laying bricks or stones
Fire wall 12.2, is provided with rock wool wall on the inside of armored concrete fire wall 12.2 and beam, the furnace bottom of trial furnace by laying fireproof bricks 14,
And floss hole is evenly arranged, floss hole is provided with air exhauster and is connected with outdoor chimney, and experiment furnace sidewall up to sets a spray less
Mouthful, nozzle 12.4 is located at nozzle, and the output end of oil pump is connected with nozzle 12.4, and the input port of oil pump is connected with fuel tank.Entering
During row fire test, air exhauster will test inner flue gas of the stove by flue and chimney discharge outdoor, breadboard 13 be entered before experiment
Row preloads, and each part of loading device is fully contacted with breadboard 13.Suitable temperature control system is selected, such as " think of reaches
It is special " temperature control system, multiple dismountable thermocouples should be also set at furnace wall, such as N-type K-type thermocouple.
With reference to Fig. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Figure 10, illustrate that the blanking units of present embodiment, including two punchings pass
Power bar 6.1；6.2, for the punching pre-plugged of transmission rod 6.2 in armoured concrete slab, it is close to column cap position welding stirrup
7.3, also can be preferentially from mechanically connecting, outside rectangle steel drum 7.4 is protected, the inside and outside brush fireproof coating of rectangle steel drum 7.4,
Preferential preferably fire prevention high temperature-proof material.The top of breadboard 13 sets the symmetrical two I fonts beam 11.1 in both sides；11.2 one
The symmetrical six T fonts beam 11.3 of individual beam lower end rivet interlacement；11.4 and T font beam lower cantalever length is not less than breadboard
123 clear length, I fonts beam 11.1；The steel frame crossbeam 3.1 of 11.2 upper ends just contacts, with stirrup 7.2 another section of power transmission
Bar connects, and preferentially selects on high-accuracy mechanical connection steel frames crossbeam 3.1 and puts among steel frame 9.1 and punching actuator 8
Split with billet 16.1, purpose in order to place the punching deformation of bottom of actuator 8, with stirrup 7.1 consolidated by the punching upper end of actuator 8
Knot.The present apparatus provides shocking experiment device for the shocking experiment of Concrete Subjected To Fire plate, and device can be with measurement plate bottom amount of deflection, steel
Muscle and concrete stress strain variation process, and the punching failure phenomenon of reinforced concrete on fire plate, tried with same fire
The crack for being compared plate is tested down compared with the crack developing under only punching shearing test.
With reference to Fig. 2 and Fig. 8, illustrate the fatigue load device 5 of present embodiment, it includes adjustable frequency motor 5.1, off-axis turns
Wheel 5.2, spring 5.3 and fire-resistant rubber rod 5.4, in I shaped girder steels 11.1；Fatigue load device 5 is installed, by can be with 11.2
Off-axis runner 5.2 is filled on the motor 5.1 that frequency conversion rotates, anchor connection transmission rod 6.3 is preferentially from high-strength on off-axis runner 5.2
Material is spent, the end of transmission rod 6.3 is connected with fire-resistant rubber rod 5.4 and is connected to two I types with four root springs 5.3
Girder steel 11.1；On 11.2.Fatigue load mainly considers reinforced concrete on fire plate fatigue rupture characteristic, identifies exactly
Whether breadboard damages, it is determined that the position of damage and degree, predict its fatigue life, can mutually be tied with shearing and impacting mechanism
Close, research armoured concrete slab destroys situation under fire.
Operation principle：Preloading is carried out after entire infrastructure fully contacts, by specific temperature heating curve, lights experiment
Stove, control and load simultaneously controlled loading speed with shear 4, blanking units and fatigue load device 5 while temperature curve
Rate and time.
Concrete Subjected To Fire floor can be punched by the present invention, shearing and fatigue load influence and due to concrete building
The temperature change of plate, concrete material performance, bar material hydraulic performance decline ultimately result in the punching of concrete floor, shearing and
Fatigue rupture mechanism is combined, and studies the punching of concrete floor in the case of natural fire, shearing and fatigue to failure test device.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
According to the technical spirit of the present invention, any simple modification and equal change are made to above example, each falls within the guarantor of the present invention
Within the scope of shield.
Claims (8)
1. a kind of punching of reinforced concrete on fire floor, shearing and fatigue to failure test device, including steel frame system
(1), breadboard (13) and trial furnace (12), breadboard (13) are positioned over trial furnace (12) above, and steel frame system (1) is arranged in
Trial furnace (12) periphery, it is characterized in that：Shear (4), punching are also provided between steel frame system (1) and breadboard (13)
Cutting apparatus and fatigue load device (5), shear (4) are arranged in the horizontal direction of breadboard (13), and blanking units are arranged on
The middle part of the vertical direction of breadboard (13), fatigue load device (5) are arranged on breadboard (13) top.
2. the punching of reinforced concrete on fire floor according to claim 1, shearing and fatigue to failure test device, its
It is characterized in：Described steel frame system (1) includes four reaction frame columns (1.1；1.2；1.3；1.4), four reaction frames are in length and breadth
Beam (2.1；2.2；2.3；And seven steel frames beam (3.1 in length and breadth 2.4)；3.2；3.3；3.4；3.5；3.6；3.7)；Four counter-forces
Erect post (1.1；1.2；1.3；1.4) four turnings of experimental rig are located at, reaction frame upright horizontal is to upper end both sides and interposition
Put and be respectively equipped with three steel frame crossbeams (3.2；3.3；3.1), reaction frame column longitudinal direction upper end both sides and centre set two respectively
Root steel frame longeron (3.6；3.7；3.4；3.5), counter-force trestle lower end is vertically and horizontally provided with four reaction frames beam (2.1 in length and breadth；2.2；
2.3；2.4).
3. the punching of reinforced concrete on fire floor according to claim 1, shearing and fatigue to failure test device, its
It is characterized in：Described shear (4) includes hinged pedestal (4.1), displacement transducer (4.2), actuator (4.3), biography of weighing
Sensor (4.4), steel knot tying (4.5) that is detachable and having handle, main transmission rod (4.6), U-shaped steel plate (4.7), length-adjustable cut
Power transmission steel plate (4.8) and 4 steel bars (4.9) are cut, a shear (4) positioned at breadboard (13) side：Main transmission rod
(4.6) one end connection shearing power transmission steel plate (4.8), other end connection steel knot tying (4.5), weighing sensor (4.4) and start
Device (4.3) is connected on displacement transducer (4.2), and hinged pedestal (4.1) anchors to steel frame by long bolt and steel bar (4.9)
On longeron (3.6), main transmission rod (4.6) is fixed on steel frame longeron (3.4) with U-shaped steel plate (4.7)；Positioned at breadboard
(13) also as above step connects in place two shears (4) of opposite side, the square steel welded together with two thickness differences
Manage the lateral displacement of (15) one end restriction plate but be not intended to limit the plane outer displacement of plate, one end is anchored at steel frame respectively with bolt
On crossbeam (3.2) and steel frame crossbeam (3.3).
4. the punching of reinforced concrete on fire floor according to claim 1, shearing and fatigue to failure test device, its
It is characterized in：Described blanking units include two punching transmission rods (6.1；6.2) transmission rod (6.2) pre-plugged, is punched in steel
In reinforced concrete plate, it is close to column cap position connection stirrup (7.3), and outside is protected with rectangle steel drum (7.4), rectangle steel drum
(7.4) inside and outside brush fireproof coating, breadboard top set the symmetrical two I fonts beam (11.1 in both sides；11.2), I fonts beam
(11.1；11.2) the symmetrical six T fonts beam (11.3 of lower end rivet interlacement；11.4) and T font beam lower cantalever length is not small
In the clear length of breadboard, I fonts beam (11.1；11.2) steel frame crossbeam (3.1) contact of upper end just, with stirrup (7.2)
Another section of punching transmission rod (6.1) is connected, steel frame (9.1) and punching actuator are put on steel frame crossbeam (3.1)
(8), middle billet (16.1) segmentation, punching actuator (8) upper end is consolidated with stirrup (7.1).
5. the punching of reinforced concrete on fire floor according to claim 1, shearing and fatigue to failure test device, its
It is characterized in：Described fatigue load device (5) includes adjustable frequency motor (5.1), off-axis runner (5.2), spring (5.3) and fire prevention
Rubber bar (5.4), fills off-axis runner (5.2) on adjustable frequency motor (5.1), anchor connection transmission rod on off-axis runner (5.2)
(6.3), transmission rod end is connected with fire-resistant rubber rod (5.4) and is connected to two I types with four root springs (5.3)
Girder steel (11.1；11.2) on.
6. the punching of reinforced concrete on fire floor according to claim 1, shearing and fatigue to failure test device, its
It is characterized in：Four sides of described trial furnace (12) are made up of reinforced column (12.1) and reinforced beam (12.3), interior
Side builds armored concrete fire wall (12.2) by laying bricks or stones, is set on the inside of armored concrete fire wall (12.2) and reinforced beam (12.3)
There is rock wool wall, the furnace bottom (14) of trial furnace (12) is evenly arranged floss hole by laying fireproof bricks, and floss hole is provided with air exhauster simultaneously
It is connected with outdoor chimney, multiple dismountable thermocouples is also set up at furnace wall.
7. the punching of the reinforced concrete on fire floor according to any one of claim 1 to 6, shearing and fatigue rupture examination
Experiment device, it is characterized in that：Supported under described breadboard (13) with steel spin (10) and ball hinged support (10.1), in breadboard
(13) centre position on adjacent both sides sets a steel roller bearing (10.2) mutually level with steel ball (10) respectively.
8. the punching of the reinforced concrete on fire floor according to any one of claim 1 to 6, shearing and fatigue rupture examination
Experiment device, it is characterized in that：It is with alumina silicate fiber felt that the gap plugging between described breadboard (13) and trial furnace (12) is tight
It is real, it is under breadboard (13) with steel frame (9.2) guarantee test plate (13) under rigidity basis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711024791.1A CN107884262B (en) | 2017-10-27 | 2017-10-27 | Punching, shearing and fatigue failure test device for reinforced concrete floor slab under fire |
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|---|---|---|---|
| CN201711024791.1A CN107884262B (en) | 2017-10-27 | 2017-10-27 | Punching, shearing and fatigue failure test device for reinforced concrete floor slab under fire |
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| CN107884262B CN107884262B (en) | 2020-03-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111424732A (en) * | 2020-03-21 | 2020-07-17 | 重庆大学 | All-process centrifugal device and method for simulating sequential installation of pile groups and negative frictional resistance |
| CN111855407A (en) * | 2020-07-20 | 2020-10-30 | 中国建筑科学研究院有限公司 | Be suitable for experimental device of building curtain fire prevention tectonic property |
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| 王勇等: "板角约束混凝土双向板抗火性能试验研究", 《建筑结构学报》 * |
| 谷凡: "板柱结构抗火性能研究综述", 《建筑与预算》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424732A (en) * | 2020-03-21 | 2020-07-17 | 重庆大学 | All-process centrifugal device and method for simulating sequential installation of pile groups and negative frictional resistance |
| CN111855407A (en) * | 2020-07-20 | 2020-10-30 | 中国建筑科学研究院有限公司 | Be suitable for experimental device of building curtain fire prevention tectonic property |
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|---|---|
| CN107884262B (en) | 2020-03-17 |
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