CN104215653A - System for testing fire resistance of reinforced concrete plate under effect of boundary restriction by utilizing jack - Google Patents
System for testing fire resistance of reinforced concrete plate under effect of boundary restriction by utilizing jack Download PDFInfo
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- CN104215653A CN104215653A CN201410420317.0A CN201410420317A CN104215653A CN 104215653 A CN104215653 A CN 104215653A CN 201410420317 A CN201410420317 A CN 201410420317A CN 104215653 A CN104215653 A CN 104215653A
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- 238000012360 testing method Methods 0.000 title claims abstract description 81
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 66
- 230000000694 effects Effects 0.000 title abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 87
- 239000010959 steel Substances 0.000 claims abstract description 87
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 239000004567 concrete Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 14
- 229920000742 Cotton Polymers 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000002828 fuel tank Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 239000002436 steel type Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 241000219146 Gossypium Species 0.000 description 7
- 241000196324 Embryophyta Species 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The invention discloses a system for testing fire resistance of a reinforced concrete plate under effect of boundary restriction by utilizing a jack. The system comprises a test furnace device (1), a boundary restriction device (2), a loading article (3) and a control and data acquisition device (4), wherein a steel ball (1.2) and a steel rolling shaft (1.3) are arranged between the top surface of a furnace body (1.1) and a reinforced concrete test floor slab (5); the boundary restriction device comprises a grooved support (2.1), a steel support (2.2), a steel strand (2.4), a jack (2.5) and a steel strand clamp (2.6); the control and data acquisition device comprises a central processor, a flame control loop, a temperature acquisition loop, a displacement acquisition loop, a strain acquisition loop and a jack control loop. According to the system for testing the fire resistance, the interaction between two adjacent components of the structure in the fire is approximately considered by a way of applying restriction to the boundary of the component, so that the influence law of different boundary restriction action on the fire resistance of the reinforced concrete plate can be researched conveniently.
Description
Technical field
The present invention relates to a kind of reinforced concrete floor Fire-resistance test system, specifically a kind of reinforced concrete floor Fire-resistance test system utilizing lifting jack to carry out boundary constraint, thus obtain different boundary effect of contraction to the affecting laws of reinforced concrete floor fire resistance, belong to building structure and to prevent and reduce natural disasters technical field.
Background technology
Along with China's rapid development of economy, people's living standard and quality are greatly improved, and recent year skyscraper emerges in multitude, and buildings, once catch fire, will bring about great losses to the life of people and property.
The fire resistance rating of building element mainly records according to the fire testing of standard, namely regulation Elevated Temperature Conditions, pressure condition, loading environment, require by fiery condition etc. under, detect the component such as wall, post, beam, floor and can meet the requirements such as stability, integrality, thermal insulation, the fire resistance of research existing structure and how to improve building structure by appropriate design, important topic that the fire-resistance capacity of component is current building fire area research.
Reinforced concrete floor is as one of significant levels component in building structure, not only bear the vertical load of structure, also play a part horizontal subdivision, when building breaking out of fire, its fire area is comparatively large, comparatively serious by fire, so reinforced concrete floor fire resistance in a fire in research structure, carry out rational resisting fire design, have great importance.
Current, the Fire-resistance test of most of armoured concrete slab does not consider boundary constraint, concrete slab can be out of shape within the scope of its plate face in free expansion, and in a practical situation, the constraint that Concrete At High Temperature floor is subject to adjacent floor deck due to its distortion can show characteristic visibly different with independent floor member.
When the fire-resistance behavior of research floor and fire resistance, if do not consider that in structure, adjacent floor deck retrains the impact of produced power on result of study mutually, likely cause in some cases by test obtain internal force of floor, distortion and fire endurance and practical structures component difference larger, its boundary condition and practical structures component is caused not to be inconsistent, can not complete reaction its at integrally-built fire-resistance behavior, therefore study the fire resistance in a fire of armoured concrete slab under boundary constraint and failure mode has important practical significance.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of lifting jack boundary constraint armoured concrete slab Fire-resistance test system, by taking out a minor structure or the mode that component border imposes restriction is similar to the interaction considered in fire between structure adjacent members from original structure, be convenient to study different boundary constraint effects to the affecting laws of armoured concrete slab fire resistance, and then the resisting fire design of reinforced concrete floor can be instructed according to test figure, improve its fire resistance.
To achieve these goals, this lifting jack boundary constraint armoured concrete slab Fire-resistance test system comprises trial furnace device, boundary constraint device, adds loading and control and data collector.
Described trial furnace device comprises body of heater, drop-bottom, oil supply pipe, integral combustor, furnace temperature thermopair and discharge flue;
Body of heater adopts fire resistive material protection, comprise assembled furnace wall and web member, connected by web member between assembled furnace wall, body of heater is provided with burner mounting hole, between body of heater end face and reinforced concrete test floor, steel ball and steel roller bearing are set, fill the space between steel ball and steel roller bearing with flexible fire resistive material;
Drop-bottom is fixedly connected on bottom of furnace body, is provided with exhaust opening above;
Oil supply pipe is arranged on body of heater outside around ground, oil supply pipe and fuel tank and fuel delivery mechanism connection;
The spout of integral combustor is arranged towards furnace interior, and to be arranged on oil supply pipe through the burner mounting hole on body of heater and to be communicated with oil supply pipe, and the junction of integral combustor and oil supply pipe is installed and is connected with electron servo valve and lighter;
Furnace temperature thermopair is arranged on inboard wall of furnace body top;
Discharge flue is communicated with the exhaust opening of drop-bottom.
Described boundary constraint device comprises grooved support, bracing members, steel strand wires, lifting jack and steel stranded wire clamper;
Grooved support is arranged on the edges of boards of reinforced concrete test floor relative position, at least be symmetrical arranged a pair, grooved supporting section is channel steel type mechanism, and the gauge that floor tested by its width of rebate size and reinforced concrete coordinates, and reinforced concrete laboratory building board enters notch inside;
One or more bracing members perpendicular to reinforced concrete test floor is arranged in each grooved symmetrically along grooved bearing length direction and supports on the back side, and each bracing members all supports the back side by link and grooved and is connected;
Symmetrically arranged bracing members is connected by steel strand wires; steel strand wires outside is provided with rigidity fire resistive material protective seam; steel strand wires one end connects lifting jack; the other end clamps with steel stranded wire clamper through behind the top of bracing members on both sides or bottom; the bracing members of one group of symmetry is arranged upper and lower two steel strand wires, two lifting jack and two steel stranded wire clampers; and diagonal angle is arranged in two lifting jack and two steel stranded wire clamper cross-wise direction; after each lifting jack parallel connection with how push up diverting valve and is connected, push up diverting valve more and be connected with pumping plant.
The described loading that adds is placed on reinforced concrete test floor.
Described control and data collector comprise central processing unit, flame control loop, temperature acquisition loop, displacement acquisition loop, strain acquirement loop and lifting jack control loop, and central processing unit is electrically connected with the electron servo valve on integral combustor and lighter; Central processing unit is electrically connected with data collecting instrument, and data collecting instrument is electrically connected with furnace temperature thermopair, and data collecting instrument is electrically connected with the thermopair of the measurement concrete and reinforcing bar temperature that are arranged on reinforced concrete laboratory building intralamellar part; Data collecting instrument is electrically connected with the displacement transducer of the inside and outside displacement in measurement floor level be arranged on reinforced concrete laboratory building board plane; The foil gauge that data collecting instrument strains with the measurement reinforcing bar being arranged on reinforced concrete laboratory building intralamellar part is electrically connected; Central processing unit with push up diverting valve more and be electrically connected.
Scheme as a further improvement on the present invention, described trial furnace device also comprises water circulating pipe, and water circulating pipe is wrapped in discharge flue outside and is connected with water pump by electron servo valve; Described control and data collector also comprise Control for Kiln Temperature loop, and central processing unit is electrically connected with the electron servo valve on water circulating pipe.
Scheme as a further improvement on the present invention, described bracing members is at least arranged upper and lower two symmetrically arranged links, the back side width dimensions that spacing between two links and grooved support coordinates, and each bracing members is all connected to grooved by link and supports on the back side.
Scheme as a further improvement on the present invention, described link is steel pipe, and its axis being parallel is arranged in reinforced concrete test floor plate face, and each bracing members is all connected to each other together by the connecting link penetrated in steel pipe.
Scheme as a further improvement on the present invention, described steel ball and steel roller bearing diameter dimension are set to 80 ~ 100 ㎜.
Scheme as a further improvement on the present invention, the spacing between described steel ball gets 3 ~ 5 times of reinforced concrete test floor thickness of slab.
As preferred version of the present invention, synchronous hollow hydraulic jack selected by described lifting jack.
Scheme as a further improvement on the present invention, refractory fiber cotton selected by described flexible fire resistive material.
Scheme as a further improvement on the present invention, refractory pipe selected by described rigidity fire resistive material protective seam, and with refractory fiber cotton by closely knit for the fill gaps in ceramic pipe.
Scheme as a further improvement on the present invention, described body of heater arranges flame-observing hole.
Compared with prior art, this lifting jack boundary constraint armoured concrete slab Fire-resistance test system provides boundary constraint power owing to being provided with lifting jack, improve existing reinforced concrete floor fire test technology and actual building structural element retrains inconsistent shortcoming, and then the fire-resistance behavior of armoured concrete slab and different boundary constraint effects can be furtherd investigate to the affecting laws of armoured concrete slab fire resistance; Because body of heater adopts removable assembled furnace wall, therefore size dimension can be determined flexibly, and pilot system is installed, convenient disassembly, and test efficiency is high; Hydraulic jack in boundary constraint device reaches self-equilibrating by steel strand wires, therefore need not install reaction frame, makes apparatus of the present invention have more economy, versatility; In-furnace temperature adopts thermocouple measurement, can monitor in real time, and can regulate at any time in-furnace temperature, makes in-furnace temperature well can meet the heating curve of ISO834 international standard heating curve or other settings; Owing to being provided with temperature acquisition loop, displacement acquisition loop and strain acquirement loop, therefore can measure the parameters such as the temperature of breadboard inner concrete and reinforcing bar, the inside and outside displacement of board plane and reinforcing bar strain simultaneously.
Accompanying drawing explanation
Fig. 1 is vertical view cutaway drawing of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to cut-open view;
Fig. 3 is the cross sectional view of boundary constraint device of the present invention;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the arrangenent diagram of steel ball of the present invention and firm roller bearing;
Fig. 6 is the long limit of reinforced concrete breadboard boundary constraint Plant arrangement schematic diagram when having a boundary constraint;
Fig. 7 is the minor face of reinforced concrete breadboard boundary constraint Plant arrangement schematic diagram when having a boundary constraint;
Fig. 8 is four limits of reinforced concrete breadboard boundary constraint Plant arrangement schematic diagram when having a boundary constraint.
In figure: 1, trial furnace device, 1.1, body of heater, 1.2, steel ball, 1.3, steel roller bearing, 1.4, drop-bottom, 1.5, oil supply pipe, 1.6, integral combustor, 1.7, furnace temperature thermopair, 1.8, discharge flue, 1.9, water circulating pipe, 2, boundary constraint device, 2.1, grooved supports, 2.2, bracing members, 2.3, link, 2.4, steel strand wires, 2.5, lifting jack, 2.6, steel stranded wire clamper, 3, add loading, 4, control and data collector, 5, reinforced concrete test floor, 6, flexible fire resistive material, 7, fuel tank and fuel delivery mechanism, 8, water pump, 9, rigidity fire resistive material protective seam, 10, push up diverting valve more.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1 and Figure 2, this lifting jack boundary constraint armoured concrete slab Fire-resistance test system comprises trial furnace device 1, boundary constraint device 2, adds loading 3 and control and data collector 4.
Described trial furnace device 1 comprises body of heater 1.1, drop-bottom 1.4, oil supply pipe 1.5, integral combustor 1.6, furnace temperature thermopair 1.7 and discharge flue 1.8;
Body of heater 1.1 adopts fire resistive material to protect, comprise assembled furnace wall and web member, connected by web member between assembled furnace wall, body of heater 1.1 is provided with burner mounting hole, between body of heater 1.1 end face and reinforced concrete test floor 5, steel ball 1.2 and steel roller bearing 1.3 are set, as shown in Figure 5, steel ball 1.2 and steel roller bearing 1.3, for spacer bar concrete test floor 5, fill the space between steel ball 1.2 and steel roller bearing 1.3 with suitable flexible fire resistive material 6;
Drop-bottom 1.4 is fixedly connected on bottom body of heater 1.1, is provided with exhaust opening above;
It is outside that oil supply pipe 1.5 is arranged on body of heater 1.1 around ground, and oil supply pipe 1.5 is communicated with fuel tank and fuel delivery mechanism 7;
The spout of integral combustor 1.6 is arranged towards body of heater 1.1 inside, and to be arranged on oil supply pipe 1.5 through the burner mounting hole on body of heater 1.1 and to be communicated with oil supply pipe 1.5, integral combustor 1.6 is installed with the junction of oil supply pipe 1.5 and is connected with electron servo valve and lighter;
Furnace temperature thermopair 1.7 is arranged on body of heater 1.1 upper inside wall;
Discharge flue 1.8 is communicated with the exhaust opening of drop-bottom 1.4.
As shown in Figure 3, Figure 4, described boundary constraint device 2 comprises grooved support 2.1, bracing members 2.2, steel strand wires 2.4, lifting jack 2.5 and steel stranded wire clamper 2.6 etc.,
Grooved supports 2.1 and is arranged on the edges of boards of reinforced concrete test floor 5 relative position, at least be symmetrical arranged a pair, it is channel steel type mechanisms that grooved supports 2.1 cross sections, the gauge that floor 5 tested by its width of rebate size and reinforced concrete coordinates, and reinforced concrete test floor 5 snaps in notch inside;
One or more bracing members 2.2 perpendicular to reinforced concrete test floor 5 supports 2.1 length directions along grooved and is arranged in each grooved symmetrically and supports on 2.1 back sides, and each bracing members 2.2 all supports 2.1 back sides by link 2.3 and grooved and is connected;
Symmetrically arranged bracing members 2.2 is connected by steel strand wires 2.4, steel strand wires 2.4 outside is provided with rigidity fire resistive material protective seam 9, steel strand wires 2.4 one end connects lifting jack 2.5, the other end clamps with steel stranded wire clamper 2.6 through behind the top of bracing members 2.2 on both sides or bottom, the bracing members 2.2 of one group of symmetry is arranged, lower two steel strand wires 2.4, two lifting jack 2.5 and two steel stranded wire clampers 2.6, and as shown in the figure, in two lifting jack 2.5 and two steel stranded wire clamper 2.6 cross-wise direction, diagonal angle is arranged, push up diverting valve 10 be connected with after each lifting jack 2.5 is in parallel, many tops diverting valve 10 is connected with pumping plant.
The described loading 3 that adds is placed on reinforced concrete test floor 5.
Described control and data collector 4 comprise central processing unit, flame control loop, temperature acquisition loop, displacement acquisition loop, strain acquirement loop and lifting jack control loop, and central processing unit is electrically connected with the electron servo valve on integral combustor 1.6 and lighter; Central processing unit is electrically connected with data collecting instrument, and data collecting instrument is electrically connected with furnace temperature thermopair 1.7, and data collecting instrument is electrically connected with the thermopair being arranged on the measurement concrete and reinforcing bar temperature that floor 5 inside tested by reinforced concrete; Data collecting instrument is electrically connected with the displacement transducer being arranged on the inside and outside displacement in measurement floor level that reinforced concrete is tested in floor 5 plane; Data collecting instrument be arranged on the foil gauge that measurement reinforcing bar that reinforced concrete tests floor 5 inside strains and be electrically connected; Central processing unit with push up diverting valve 10 more and be electrically connected.
The Fire-resistance test system of this reinforced concrete floor in use, first build suitable body of heater 1.1 according to the size of reinforced concrete test floor 5 and the miscellaneous parts such as drop-bottom 1.4, oil supply pipe 1.5, integral combustor 1.6, furnace temperature thermopair 1.7 and discharge flue 1.8 are installed, between body of heater 1.1 top and test floor, lay steel ball 1.2 and steel roller bearing 1.3, fill the space between steel ball 1.2 and steel roller bearing 1.3 with suitable flexible fire resistive material 6;
Then grooved is supported two ends, left and right or rear and front end that 2.1 symmetries are installed on reinforced concrete test floor 5, bracing members 2.2 being arranged on grooved supports on 2.1 again, symmetrically arranged bracing members 2.2 is undertaken connecting by steel strand wires 2.4 and goes here and there rigidity fire resistive material protective seam 9, diagonal angle arranges two lifting jack 2.5 and two steel stranded wire clampers 2.6 also pass through to regulate steel stranded wire clamper 2.6 tensioner steel strand wires 2.4, and making reinforced concrete test floor 5 becomes an entirety with boundary constraint device 2; Reinforced concrete is tested floor 5 with boundary constraint device 2 integral hoisting on trial furnace device 1, be erected on steel ball 1.2 and steel roller bearing 1.3;
Then reinforced concrete test floor 5 on place with the equivalence of structural design working load add loading 3, as balancing weight etc.;
Then connection control and data collector 4, central processing unit is electrically connected with the electron servo valve on integral combustor 1.6 and lighter, central processing unit is electrically connected with data collecting instrument, data collecting instrument is electrically connected with furnace temperature thermopair 1.7, data collecting instrument is electrically connected with the thermopair being arranged on the measurement concrete and reinforcing bar temperature that floor 5 inside tested by reinforced concrete, data collecting instrument be arranged in measurement floor level that reinforced concrete tests in floor 5 plane, the displacement transducer electrical connection of outer displacement, data collecting instrument be arranged on the foil gauge that measurement reinforcing bar that reinforced concrete tests floor 5 inside strains and be electrically connected, finally, profit is computerizedd control and is lighted a fire.
This lifting jack boundary constraint armoured concrete slab Fire-resistance test system can Real-time Collection furnace temperature and furnace pressure, control furnace temperature to heat up by setting curve, the parameter such as the inside and outside displacement of plane of floor inner concrete and reinforcing bar temperature, floor and reinforcing bar high-temp strain in the test of data acquisition instrument Real-time Collection; Shunted by the hydraulic oil controlled in many top diverting valves 10 pairs of lifting jack, thus control size and the speed of the applying of boundary constraint power.
Generally, the control of furnace temperature can be controlled by flame control loop, namely central processing unit controls the size of fuel delivery by the folding size that the feedback of data collecting instrument sends the electron servo valve that instruction controls on integral combustor 1.6, but the reduction of body of heater 1.1 internal temperature controls by means of only reduction fuel delivery, it underspeeds very slow, therefore in order to effectively control furnace temperature fast further, scheme as a further improvement on the present invention, described trial furnace device 1 also comprises water circulating pipe 1.9, it is outside that water circulating pipe 1.9 is wrapped in discharge flue 1.8, and be connected with water pump 8 by electron servo valve, described control and data collector 4 also comprise Control for Kiln Temperature loop, central processing unit is electrically connected with the electron servo valve on water circulating pipe 1.9, by controlling the flow velocity of the folding size controlled circulation water of the electron servo valve on water circulating pipe 1.9, when furnace temperature height, the flow velocity of recirculated water is accelerated, when furnace temperature is low, close recirculated water, and then realize effectively controlling furnace temperature fast.
In order to ensure that bracing members 2.2 is arranged on grooved and supports the harmony that when steadiness on 2.1 and lifting jack 2.5 are exerted pressure, exert pressure in bracing members 2.2 pairs of reinforced concrete test floor 5 borders further, scheme as a further improvement on the present invention, described bracing members 2.2 is at least arranged upper and lower two symmetrically arranged links 2.3, the back side width dimensions that spacing between two links 2.3 and grooved support 2.1 coordinates, each bracing members 2.2 is all connected to grooved by link 2.3 and supports on 2.1 back sides, realizes firmly connection and equilibrium and exerts pressure.
In order to the synchronism of exerting pressure to border when ensureing to exert pressure in lifting jack 2.5 pairs of reinforced concrete test floor 5 borders further, prevent because of alignment error cause exert pressure asynchronous, scheme as a further improvement on the present invention, described link 2.3 is steel pipes, its axis being parallel is arranged in reinforced concrete test floor 5 plate face, each bracing members 2.2 is all connected to each other together by the connecting link penetrated in steel pipe, thus prevent because of alignment error cause exert pressure asynchronous.
According to GB/T 50152-2012 " Standard for test methods of concrete structures ", be the load in guarantor unit's length, as a further improvement on the present invention scheme, described steel ball 1.2 and steel roller bearing 1.3 diameter dimension are set to 80 ~ 100 ㎜.
According to GB/T 9978.1-2008 " building element fire testing method ", for ensureing enough support degrees, scheme as a further improvement on the present invention, the spacing between described steel ball 1.2 gets 3 ~ 5 times of reinforced concrete test floor 5 thickness of slab.
Lifting jack 2.5 can select mechanical screw jack or hydraulic jack, due to hydraulic jack simple structure and output pressure stablize, therefore preferred hydraulic jack, namely, as preferred version of the present invention, synchronous hollow hydraulic jack selected by described lifting jack 2.5.
Closely knit in order to ensure the fill gaps between steel ball 1.2 and steel roller bearing 1.3, scheme as a further improvement on the present invention, refractory fiber cotton selected by described flexible fire resistive material 6.
In order to available protecting is through the steel strand wires 2.4 of trial furnace device 1, avoid burning damage, scheme as a further improvement on the present invention, refractory pipe selected by described rigidity fire resistive material protective seam 9, and with refractory fiber cotton by closely knit for the fill gaps in ceramic pipe.
Combustion case and test specimen for the ease of observing body of heater 1 flame are subject to the situations such as fire, and scheme as a further improvement on the present invention, described body of heater 1.1 arranges flame-observing hole.
Embodiment: design reinforced concrete test floor 5 is long × wide is of a size of 4300 ㎜ × 3300 ㎜, and thickness of slab is 120 ㎜.Fire-resistance test is carried out to this armoured concrete slab by boundary constraint effect.
Body of heater 1.1 is made up of 100 ㎜ steel plates (outward) and 200 ㎜ refractory fiber cottons (interior), gross thickness is 300 ㎜, finally determine that the length of body of heater × wide is of a size of 4000 ㎜ × 3000 ㎜, the furnace wall on the every limit of body of heater is evenly arranged two integral combustors 1.3, diameter is set between body of heater 1.1 top and breadboard 5 and is the steel ball 1.2 of 100 ㎜ and steel roller bearing 1.3 as support, steel ball spacing gets 400 ㎜ at long side direction, short side direction gets 300 ㎜, fills the space between steel ball 1.2 and steel roller bearing 1.3 with refractory fiber cotton.
Arrange boundary constraint device 2 according to reinforced concrete test floor 5 concrete condition, select refractory protection of pipe through the steel strand wires 2.4 of body of heater 1.1, with refractory fiber cotton by closely knit for the fill gaps in ceramic pipe.
When there is boundary constraint on the long limit of reinforced concrete test floor 5, boundary constraint device 2 is arranged as Fig. 6.
When the minor face of reinforced concrete test floor 5 has a boundary constraint, boundary constraint device 2 is arranged as Fig. 7.
When all there is boundary constraint on four limits of reinforced concrete test floor 5, boundary constraint device 2 is arranged as Fig. 8.
Discharge flue 1.5 and water circulating pipe 1.6 are all in effective working range, are convenient to timely smoke evacuation.
Breadboard 5 plate face is evenly arranged the loading blocks of 20kg, simulates uniform live load 2KN/ ㎡.
During test, by pre-buried for thermopair in reinforced concrete test floor 5, displacement meter and reinforcing bar foil gauge are arranged in corresponding measuring point, then the instruments such as thermopair, displacement meter and foil gauge are wired to data collecting instrument, final data Acquisition Instrument is connected with computing machine, automatically furnace temperature is controlled by computing machine, and Real-time Collection test figure.
After debugging correlation test instrument, control igniting by computing machine, start test, gather correlation test data.
During test, shunted by the hydraulic oil controlled in many tops diverting valve 10 pairs of lifting jack of hollow jack, thus control size and the speed of the applying of boundary constraint power.
This lifting jack boundary constraint armoured concrete slab Fire-resistance test system improves existing reinforced concrete floor fire test technology and actual building structural element retrains inconsistent shortcoming, and then can further investigate the fire-resistance behavior of armoured concrete slab and different boundary constraint effects to the affecting laws of armoured concrete slab fire resistance; Pilot system is installed, convenient disassembly, and test efficiency is high; Reaction frame need not be installed, make this device have more economy, versatility; In-furnace temperature adopts thermocouple measurement, can monitor in real time, and can regulate at any time in-furnace temperature, makes in-furnace temperature well can meet the heating curve of ISO834 international standard heating curve or other settings; The parameters such as the temperature of breadboard inner concrete and reinforcing bar, the inside and outside displacement of board plane and reinforcing bar strain can be measured simultaneously.
Claims (10)
1. a lifting jack boundary constraint armoured concrete slab Fire-resistance test system, comprise trial furnace device (1), boundary constraint device (2), add loading (3) and control and data collector (4), trial furnace device (1) comprises body of heater (1.1), drop-bottom (1.4), oil supply pipe (1.5), integral combustor (1.6), furnace temperature thermopair (1.7) and discharge flue (1.8), body of heater (1.1) adopts fire resistive material protection, comprise assembled furnace wall and web member, connected by web member between assembled furnace wall, (1.1) are provided with burner mounting hole to body of heater, drop-bottom (1.4) is fixedly connected on body of heater (1.1) bottom, is provided with exhaust opening above, it is outside that oil supply pipe (1.5) is arranged on body of heater (1.1) around ground, and oil supply pipe (1.5) is communicated with fuel tank and fuel delivery mechanism (7), the spout of integral combustor (1.6) is arranged towards body of heater (1.1) inside, and it is upper and is communicated with oil supply pipe (1.5) to be arranged on oil supply pipe (1.5) through the burner mounting hole on body of heater (1.1), the junction of integral combustor (1.6) and oil supply pipe (1.5) is installed and is connected with electron servo valve and lighter, furnace temperature thermopair (1.7) is arranged on body of heater 1.1 upper inside wall, discharge flue (1.8) is communicated with the exhaust opening of drop-bottom (1.4),
Adding loading (3) is placed on reinforced concrete test floor (5);
Control and data collector (4) comprise central processing unit, flame control loop, temperature acquisition loop, displacement acquisition loop and strain acquirement loop, and central processing unit is electrically connected with the electron servo valve on integral combustor (1.6) and lighter; Central processing unit is electrically connected with data collecting instrument, and data collecting instrument is electrically connected with furnace temperature thermopair (1.7), and data collecting instrument is electrically connected with the thermopair being arranged on the measurement concrete and reinforcing bar temperature that floor (5) inside tested by reinforced concrete; Data collecting instrument is electrically connected with the displacement transducer being arranged on the inside and outside displacement in measurement floor level that reinforced concrete is tested in floor (5) plane; Data collecting instrument be arranged on reinforced concrete and test the foil gauge that the inner measurement reinforcing bar of floor (5) strains and be electrically connected;
It is characterized in that, between described body of heater (1.1) end face and reinforced concrete test floor (5), steel ball (1.2) and steel roller bearing (1.3) are set, fill the space between steel ball (1.2) and steel roller bearing (1.3) with flexible fire resistive material (6);
Described boundary constraint device (2) comprises grooved and supports (2.1), bracing members (2.2), steel strand wires (2.4), lifting jack (2.5) and steel stranded wire clamper (2.6);
Grooved supports (2.1) and is arranged on the edges of boards of reinforced concrete test floor (5) relative position, at least be symmetrical arranged a pair, it is channel steel type mechanism that grooved supports (2.1) cross section, the gauge that floor (5) tested by its width of rebate size and reinforced concrete coordinates, and reinforced concrete test floor (5) snaps in notch inside;
One or more bracing members (2.2) perpendicular to reinforced concrete test floor (5) supports (2.1) length direction along grooved and is arranged in symmetrically on each grooved support (2.1) back side, and each bracing members (2.2) is all connected by supporting (2.1) back side with its link be fixedly connected with (2.3) with grooved;
Symmetrically arranged bracing members (2.2) is connected by steel strand wires (2.4), steel strand wires (2.4) outside is provided with rigidity fire resistive material protective seam protective seam (9), steel strand wires (2.4) one end connects lifting jack (2.5), the other end through behind the top of bracing members (2.2) on both sides or bottom with steel stranded wire clamper (2.6) clamping, the bracing members (2.2) of one group of symmetry is arranged, lower two steel strand wires (2.4), two lifting jack (2.5) and two steel stranded wire clampers (2.6), and diagonal angle is arranged in two lifting jack (2.5) and two steel stranded wire clamper (2.6) cross-wise direction, after each lifting jack (2.5) is in parallel with push up diverting valve (10) more and be connected, push up diverting valve (10) to be connected with pumping plant more,
Described control and data collector (4) also comprise lifting jack control loop, central processing unit with push up diverting valve (10) more and be electrically connected.
2. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1, it is characterized in that, described trial furnace device (1) also comprises water circulating pipe (1.9), and water circulating pipe (1.9) is wrapped in discharge flue (1.8) outside and is connected with water pump (8) by electron servo valve; Described control and data collector (4) also comprise Control for Kiln Temperature loop, and central processing unit is electrically connected with the electron servo valve on water circulating pipe (1.9).
3. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, it is characterized in that, described bracing members (2.2) is at least arranged upper and lower two symmetrically arranged links (2.3), spacing between two links (2.3) supports (2.1) back side width dimensions with grooved coordinates, and each bracing members (2.2) is all connected to grooved by link (2.3) and supports on (2.1) back side.
4. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 3, it is characterized in that, described link (2.3) is steel pipe, its axis being parallel is tested floor (5) plate face in reinforced concrete and is arranged, and each bracing members (2.2) is all connected to each other together by the connecting link penetrated in steel pipe.
5. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, it is characterized in that, described steel ball (1.2) and steel roller bearing (1.3) diameter dimension are set to 80 ~ 100 ㎜.
6. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, is characterized in that, the spacing between described steel ball (1.2) gets 3 ~ 5 times of reinforced concrete test floor (5) thickness of slab.
7. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, it is characterized in that, synchronous hollow hydraulic jack selected by described lifting jack (2.5).
8. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, it is characterized in that, refractory fiber cotton selected by described flexible fire resistive material (6).
9. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, it is characterized in that, refractory pipe selected by described rigidity fire resistive material protective seam (9), and with refractory fiber cotton by closely knit for the fill gaps in ceramic pipe.
10. lifting jack boundary constraint armoured concrete slab Fire-resistance test system according to claim 1 and 2, is characterized in that, described body of heater (1.1) arranges flame-observing hole.
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| CN109406279A (en) * | 2018-12-04 | 2019-03-01 | 华侨大学 | The experimental provision and experimental method of superstructure micromechanism of damage when a kind of research fire |
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