CN104563283A - Reinforced concrete fire-resistant test piece, design method, testing system and testing method - Google Patents
Reinforced concrete fire-resistant test piece, design method, testing system and testing method Download PDFInfo
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- CN104563283A CN104563283A CN201410751642.5A CN201410751642A CN104563283A CN 104563283 A CN104563283 A CN 104563283A CN 201410751642 A CN201410751642 A CN 201410751642A CN 104563283 A CN104563283 A CN 104563283A
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Abstract
The invention discloses a reinforced concrete fire-resistant test piece, a design method, a testing system and a testing method. The reinforced concrete fire-resistant test piece is formed by connecting two pillars and a beam; both ends of the beam are rigidly connected with the top ends of the two pillars (i.e. the reinforced concrete fire-resistant test piece is a component which is formed by integrated casting); both the beam and the pillars are reinforced concrete components; protection layers of the beam and the pillars have thicknesses of 35mm to 40mm. The reinforced concrete fire-resistant test piece adopts a beam and pillar combination frame structure, has more excellent fire resistance than a test piece adopting a single form, and has high bearing capacity.
Description
Technical field
The present invention relates to a kind of steel concrete fire-resistance test specimen, method for designing, test macro and method.
Background technology
In order to the fire resistance of Study on Steel reinforced concrete test specimen, be all the simple component of design comparison, as solid memders such as beam, post, plates, its stress performance is fairly simple, and fire resistance is poor, and bearing capacity is lower in the past.
Therefore, be necessary to design a kind of brand-new steel concrete fire-resistance test specimen, test macro and method.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of steel concrete fire-resistance test specimen, method for designing, test macro and method, this steel concrete fire-resistance test specimen adopts the frame construction of beam column combination, the test specimen fire resistance comparing single form is better, and bearing capacity is large.
The technical solution of invention is as follows:
A kind of steel concrete fire-resistance test specimen, is formed by connecting by 2 posts and a beam; The top of the two ends of described beam and 2 posts is rigidly connected (component being integral type moulding by casting); Described beam and column is reinforced concrete member; The thickness of the topping of described beam and column is 35mm-40mm.
In beam and column, vertical muscle adopts diameter to be the indented bars of 10-16mm; Stirrup adopts diameter to be the round steel of 8-12mm; Stirrup spacing is less than 15 times of vertical muscle diameter.(stirrup is many, arranges at equal intervals along vertical muscle, not only has 9 in Fig. 1, represents it is the schematic representation mode of arrangement of reinforcement with 3 stirrups)
Vertical muscle in beam is 5, and the vertical muscle in each post is 4.
Spacing between stirrup is 150mm; The diameter of stirrup is 8mm, and the diameter of vertical muscle is 10mm; The length of beam is 1870mm, and the height of post is 1870mm; The length of overlapped part of every root post and beam is 400mm, and the thickness of topping is 35mm; The sectional dimension of post is 300mm × 300mm; The sectional dimension of beam is 300mm × 400mm.
Concrete is formed by the following component system of mixing: cement: water: sand: a class stone: two class stone=1: 0.617: 2.257: 2.573: 1.553; Described proportioning is mass ratio; Described cement is 42.5 portland cements, and the average grain diameter of described sand is 3.0mm, and the average grain diameter of a class stone is 31.5mm, and the average grain diameter of two class stones is 15mm.
A method for designing for steel concrete fire-resistance test specimen, adopts combined framework type component as steel concrete fire-resistance test specimen to improve fire resistance and the bearing capacity of test specimen;
Described combined framework type component adopts aforesaid steel concrete fire-resistance test specimen.
A kind of test macro of steel concrete fire-resistance test specimen, comprise Fire Furnace (8), test specimen (6), fixed-hinged support and load bringing device [be have three degree of freedom for a stiffening member, be exactly horizontal degree of freedom, vertical degree of freedom and rotational freedom, and fixed-hinged support, two degree of freedom can be limited, i.e. level and vertical, can not limit rotation.】；
Test specimen (6) is vertically put in Fire Furnace (8), with 2 pieces, the left and right above Fire Furnace cover plate (9), test specimen is clipped in the middle, prevent test specimen (6) from lateral displacement occurring, at the below fixed-hinged support of test specimen (6), test specimen is fixed, prevent the displacement of test specimen occurred level; After test specimen is fixing, startup Fire Furnace makes the temperature constant in Fire Furnace, by load bringing device load application above test specimen, and then the fire resistance of test test specimen;
Described test specimen is aforesaid steel concrete fire-resistance test specimen.
The a certain temperature value of temperature constant in Fire Furnace in 600-1000 DEG C; Load bringing device has the pressure-producing part of a π type, and this pressure-producing part has 2 live ends, and the pressure point on 2 corresponding beams of live end lays respectively at 1/3 and 2/3 place of beam length.
A kind of method of testing of steel concrete fire-resistance test specimen, the test macro of aforesaid steel concrete fire-resistance test specimen is adopted to implement test, in test process, for multiple test specimen under different temperatures and different loads level, obtain the baked wheaten cake amount of deflection of test specimen and burn rear test specimen ultimate load and static deflection parameter.
Adopt 10 test specimens to carry out contrast test, testing under the condition of being heated and load of front 9 test specimens, obtain burning deflection data, test condition is as follows:
10th test specimen is not heated; [namely do not carry out hot test, be used for contrasting with front 9 test specimens]
Then at normal temperatures static loading test is done to 10 test specimens, obtain ultimate load data and the static deflection data of ten test specimens.Static deflection is the amount of deflection of corresponding test specimen when ultimate load.
Beneficial effect:
The steel concrete fire-resistance test specimen of the invention, adopt unique frame form, its framework is by the rigidly connected cage construction of beam and column, and tie point adopts and is rigidly connected, and is a size why not variant.Under vertical uniform load q, framework can be out of shape, and because beam, post are constrained each other, the mid span moment of crossbeam is less than simply supported beam, and (mid span moment is contrast, such as under identical load situation, the crossbeam mid span moment of framework test specimen is just little than simply supported beam).Under horizontal force action, the distortion of framework, compared with bent structure, just connect the thrust stiffness that can improve pillar due to beam column, thus the horizontal distortion of framework is less than framed bent.Frame construction steel concrete used has good resistance to compression and bending resistance, and therefore, when frame construction is under high temperature action, at this moment the stability of frame construction entirety and the bearing capacity of structural entity will be stronger.
Core of the present invention is creatively to devise the frame construction that is different from the beam column combination of solid memder, and its stress performance is more complicated, fire resistance and stability better.The fire resistance of reinforced concrete structure is to set up a set of reasonable, convenient and applicable fire resistant design method and method of testing on the one hand; Be on the other hand to make science to building structure Fire-damaged degree, evaluate accurately, to reduce fire damage, shorten concrete on fire structure function recovery time, provide foundation to building structure resisting fire design.
In addition, this test system structure is simple, and easy to implement, testing efficiency is high.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of combined framework type component;
Fig. 2 is A-A schematic cross-section in Fig. 1 (cross sectional representation of post);
Fig. 3 is B-B schematic cross-section in Fig. 1 (cross sectional representation of beam);
Fig. 4 is the pressurization schematic diagram of load bringing device to test specimen;
Fig. 5 is the schematic diagram (front view) that test specimen is arranged in Fire Furnace;
Fig. 6 is the schematic diagram (top view) that test specimen is arranged in Fire Furnace;
Fig. 7 is that schematic diagram fixed by test specimen.
Label declaration: 1-beam, 2-post, 3-indulges muscle, 4-stirrup, 5-topping, 6-test specimen, 7-load bringing device, 8-Fire Furnace, 9-cover plate, and L is the overall length of beam, and H is the height of post.
Detailed description of the invention
Below with reference to the drawings and specific embodiments, the present invention is described in further details:
Embodiment 1: as Fig. 1-3, a kind of steel concrete fire-resistance test specimen, is formed by connecting by 2 posts and a beam; The top of the two ends of described beam and 2 posts is rigidly connected (component being integral type moulding by casting); Described beam and column is reinforced concrete member; The thickness of the topping of described beam and column is 35mm-40mm.
In beam and column, vertical muscle adopts diameter to be the indented bars of 10-16mm; Stirrup adopts diameter to be the round steel of 8-12mm; Stirrup spacing is less than 15 times of vertical muscle diameter.(stirrup is many, arranges at equal intervals along vertical muscle, not only has 9 in Fig. 1, represents it is the schematic representation mode of arrangement of reinforcement with 3 stirrups)
Vertical muscle in beam is 5, and the vertical muscle in each post is 4.
Spacing between stirrup is 150mm; The diameter of stirrup is 8mm, and the diameter of vertical muscle is 10mm; The length of beam is 1870mm, and the height of post is 1870mm; The length of overlapped part of every root post and beam is 400mm, and the thickness of topping is 35mm; The sectional dimension of post is 300mm × 300mm; The sectional dimension of beam is 300mm × 400mm.
Concrete is formed by the following component system of mixing: cement: water: sand: a class stone: two class stone=1: 0.617: 2.257: 2.573: 1.553; Described proportioning is mass ratio; Described cement is 42.5 portland cements, and the average grain diameter of described sand is 3.0mm, and the average grain diameter of a class stone is 31.5mm, and the average grain diameter of two class stones is 15mm.
Test specimen is made up of reinforcing bar and concrete 2 kinds of materials, reinforcing bar is had inside beam and column, reinforcing bar adopts Φ 8 round steel to be stirrup, the spacing of stirrup is 150mm, Φ 10 screw-thread steel is vertical muscle, (arrangement of reinforcement is here according to piece lengths, sectional dimension and added load calculate, piece lengths and size are generally immutable, but what arrangement of reinforcement calculated is a scope, just get most economical arrangement of reinforcement, stirrup Φ 8-12 round steel, vertical muscle Φ 10-16 screw-thread steel, stirrup spacing generally should not be greater than 15 times of Reinforcement diameter) topping (protective layer thickness refers to that reinforcing bar is to the outmost thickness of concrete) thickness is that 35mm (protective layer thickness engineering has regulation, generally 35mm-40mm, 35mm is got) in the present embodiment.Concrete adopts 42.5 Portland cements, and its proportioning is cement: water: sand: a class stone (being commonly called as great Shi): two class stones (being commonly called as gravelstone)=1: 0.617: 2.257: 2.573: 1.553.(the average grain diameter 31.5mm of the average grain diameter 3.0mm of sand, great Shi, the average grain diameter of gravelstone is 15mm); Core of the present invention is structure, and concrete proportioning is not most important, namely adopts conventional concrete proportioning also can reach object of the present invention.
Embodiment 2: as Fig. 1-3, a kind of method for designing of steel concrete fire-resistance test specimen, adopts combined framework type component as steel concrete fire-resistance test specimen to improve fire resistance and the bearing capacity of test specimen;
Described combined framework type component adopts the steel concrete fire-resistance test specimen of embodiment 1.
Embodiment 3: as Fig. 4-7, a kind of test macro of steel concrete fire-resistance test specimen, comprise Fire Furnace 8, test specimen 6, fixed-hinged support and load bringing device [be have three degree of freedom for a stiffening member, be exactly horizontal degree of freedom, vertical degree of freedom and rotational freedom, and fixed-hinged support, two degree of freedom can be limited, i.e. level and vertical, can not rotation be limited.】；
Test specimen 6 is vertically put in Fire Furnace 8, with 2 pieces, the left and right above Fire Furnace cover plate 9, test specimen is clipped in the middle, prevents test specimen 6 from lateral displacement occurring, at the below fixed-hinged support of test specimen 6, test specimen is fixed, prevent the displacement of test specimen occurred level; After test specimen is fixing, startup Fire Furnace makes the temperature constant in Fire Furnace, by load bringing device load application above test specimen, and then the fire resistance of test test specimen;
Described test specimen is aforesaid steel concrete fire-resistance test specimen.
The a certain temperature value of temperature constant in Fire Furnace in 600-1000 DEG C; Load bringing device has the pressure-producing part of a π type, and this pressure-producing part has 2 live ends, and the pressure point on 2 corresponding beams of live end lays respectively at 1/3 and 2/3 place of beam length.
Embodiment 4:
As Fig. 4-7, a kind of method of testing of steel concrete fire-resistance test specimen, the test macro of the steel concrete fire-resistance test specimen of embodiment 3 is adopted to implement test, in test process, for 10 test specimens under different temperatures and different loads level, obtain the baked wheaten cake amount of deflection of test specimen and burn rear test specimen ultimate load and static deflection parameter.Test specimen 6 vertically to be put in Fire Furnace 8, with 2 pieces, the left and right above trial furnace cover plate 9, test specimen is clipped in the middle, prevents test specimen generation lateral displacement, at the below fixed-hinged support of test specimen, test specimen is fixed, prevent the displacement of test specimen occurred level.After test specimen is fixing, required fire resistance can be reached by load application above test specimen, so just well complete the Fire-resistance test of frame construction.
Adopt 10 test specimens to carry out contrast test, testing under the condition of being heated and load of front 9 test specimens, obtain burning deflection data, test condition is as follows:
10th test specimen is not heated; [namely do not carry out hot test, be used for contrasting with front 9 test specimens]
Then at normal temperatures static loading test is done to 10 test specimens, obtain ultimate load data and the static deflection data of ten test specimens.[static deflection is the amount of deflection of corresponding test specimen when ultimate load]
Burning amount of deflection is data measured under high temperature, ultimate load and static deflection are after high temperature, the data measured by the static loading test done again, and a complete through crack appears in test specimen when static loading test, namely assert that test specimen has reached capacity carrying, now the load of correspondence is ultimate load.
Test specimen in 10 embodiments 1 is tested, obtains following data:
Table 1:
Table 2:
Table 1 is the test under test specimen high temperature and load acting in conjunction, can obtain burning deflection data; Table 2 is after hot test, the static loading test (test conditions is under normal temperature) of carrying out again, the load mode of static loading test be the same under high temperature, what obtain is static deflection and ultimate bearing force data (i.e. ultimate load); T10 test specimen, not through the test specimen of hot test, is used for contrasting with test specimen under high temperature.
Table 1 and table 2 can show: under high temperature action, the ultimate bearing capacity of reinforced concrete frame structure obviously reduces, frame construction ultimate bearing capacity decline 36.9% (average of test specimen T1, T4, T7 and the ratio of T10) when temperature is 600 DEG C; Frame construction ultimate bearing capacity decline 48% (average of test specimen T2, T5, T8 and the ratio of T10) when 800 DEG C; When 1000 DEG C, frame construction ultimate bearing capacity declines up to 57.3% test specimen (average of T3, T6, T9 and the ratio of T10), substantially loses supporting capacity.
The object of this test detects the fire resistance of high temperature frame structures under action, and illustrate that the system of embodiment 3 and the method for embodiment 4 can implement the fire resistance test of test specimen.
Claims (10)
1. a steel concrete fire-resistance test specimen, is characterized in that, is formed by connecting by 2 posts and a beam; The top of the two ends of described beam and 2 posts is rigidly connected; Described beam and column is reinforced concrete member; The thickness of the topping of described beam and column is 35mm-40mm.
2. steel concrete fire-resistance test specimen according to claim 1, is characterized in that, in beam and column, vertical muscle adopts diameter to be the indented bars of 10-16mm; Stirrup adopts diameter to be the round steel of 8-12mm; Stirrup spacing is less than 15 times of vertical muscle diameter.
3. steel concrete fire-resistance test specimen according to claim 2, is characterized in that, the vertical muscle in beam is 5, and the vertical muscle in each post is 4.
4. steel concrete fire-resistance test specimen according to claim 3, is characterized in that, the spacing between stirrup is 150mm; The diameter of stirrup is 8mm, and the diameter of vertical muscle is 10mm; The length of beam is 1870mm, and the height of post is 1870mm; The length of overlapped part of every root post and beam is 400mm, and the thickness of topping is 35mm; The sectional dimension of post is 300mm × 300mm; The sectional dimension of beam is 300mm × 400mm.
5. steel concrete fire-resistance test specimen according to claim 4, is characterized in that, concrete is formed by the following component system of mixing: cement: water: sand: a class stone: two class stone=1: 0.617: 2.257: 2.573: 1.553; Described proportioning is mass ratio; Described cement is 42.5 portland cements, and the average grain diameter of described sand is 3.0mm, and the average grain diameter of a class stone is 31.5mm, and the average grain diameter of two class stones is 15mm.
6. a method for designing for steel concrete fire-resistance test specimen, is characterized in that, adopts combined framework type component as steel concrete fire-resistance test specimen to improve fire resistance and the bearing capacity of test specimen;
Described combined framework type component adopts the steel concrete fire-resistance test specimen described in any one of claim 1-5.
7. a test macro for steel concrete fire-resistance test specimen, is characterized in that, comprises Fire Furnace (8), test specimen (6), fixed-hinged support and load bringing device;
Test specimen (6) is vertically put in Fire Furnace (8), with 2 pieces, the left and right above Fire Furnace cover plate (9), test specimen is clipped in the middle, prevent test specimen (6) from lateral displacement occurring, at the below fixed-hinged support of test specimen (6), test specimen is fixed, prevent the displacement of test specimen occurred level; After test specimen is fixing, startup Fire Furnace makes the temperature constant in Fire Furnace, by load bringing device load application above test specimen, and then the fire resistance of test test specimen;
Described test specimen is the steel concrete fire-resistance test specimen described in any one of claim 1-5.
8. the test macro of steel concrete fire-resistance test specimen according to claim 7, is characterized in that, a certain temperature value of the temperature constant in Fire Furnace in 600-1000 DEG C; Load bringing device has the pressure-producing part of a π type, and this pressure-producing part has 2 live ends, and the pressure point on 2 corresponding beams of live end lays respectively at 1/3 and 2/3 place of beam length.
9. the method for testing of a steel concrete fire-resistance test specimen, it is characterized in that, right is adopted to go the test macro of the steel concrete fire-resistance test specimen wanted described in 8 to implement test, in test process, for multiple test specimen under different temperatures and different loads level, obtain the baked wheaten cake amount of deflection of test specimen and burn rear test specimen ultimate load and static deflection parameter.
10. method of testing according to claim 9, is characterized in that, adopts 10 test specimens to carry out contrast test, testing under the condition of being heated and load of front 9 test specimens, obtains burning deflection data, and test condition is as follows:
10th test specimen is not heated;
Then at normal temperatures static loading test is done to 10 test specimens, obtain ultimate load data and the static deflection data of ten test specimens.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442859A (en) * | 2016-10-27 | 2017-02-22 | 沈阳建筑大学 | Loading device for fire resistance test of slim component |
| CN109738178A (en) * | 2019-03-11 | 2019-05-10 | 南京工业大学 | Device and method for push-out test of wood-concrete composite beam shear connector under fire |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286593A (en) * | 2007-05-16 | 2008-11-27 | Shimizu Corp | Method and device for testing fire resistance of lining segment, and method of designing lining segment |
| CN201298038Y (en) * | 2008-11-28 | 2009-08-26 | 哈尔滨工业大学 | Flame-against experiment device for concrete multi-span continuous beam or board |
| CN201298040Y (en) * | 2008-12-08 | 2009-08-26 | 哈尔滨工业大学 | Flame-proof experiment device for measuring single layer frame |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286593A (en) * | 2007-05-16 | 2008-11-27 | Shimizu Corp | Method and device for testing fire resistance of lining segment, and method of designing lining segment |
| CN201298038Y (en) * | 2008-11-28 | 2009-08-26 | 哈尔滨工业大学 | Flame-against experiment device for concrete multi-span continuous beam or board |
| CN201298040Y (en) * | 2008-12-08 | 2009-08-26 | 哈尔滨工业大学 | Flame-proof experiment device for measuring single layer frame |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442859A (en) * | 2016-10-27 | 2017-02-22 | 沈阳建筑大学 | Loading device for fire resistance test of slim component |
| CN109738178A (en) * | 2019-03-11 | 2019-05-10 | 南京工业大学 | Device and method for push-out test of wood-concrete composite beam shear connector under fire |
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