CN113776955B - Concrete high-temperature compression performance test device and test method thereof - Google Patents
Concrete high-temperature compression performance test device and test method thereof Download PDFInfo
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- CN113776955B CN113776955B CN202111016222.9A CN202111016222A CN113776955B CN 113776955 B CN113776955 B CN 113776955B CN 202111016222 A CN202111016222 A CN 202111016222A CN 113776955 B CN113776955 B CN 113776955B
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- 230000006835 compression Effects 0.000 title claims description 9
- 238000007906 compression Methods 0.000 title claims description 9
- 238000011056 performance test Methods 0.000 title claims description 9
- 238000010998 test method Methods 0.000 title abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 125
- 238000003825 pressing Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000012669 compression test Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000009970 fire resistant effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 iron-nickel-aluminum Chemical compound 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides a concrete high-temperature compressive property test device and a test method thereof, wherein the test device comprises: loading equipment, heating equipment and a deformation acquisition device; the loading equipment comprises a base and an upper pressing plate, wherein a plurality of stand columns are fixedly connected to the base, the upper pressing plate is connected to the base through the stand columns, and the stand columns penetrate through the upper pressing plate and are connected with screw nuts through threads; the concrete test piece is correspondingly placed between the base and the upper pressing plate, and the nuts are fastened, so that the upper pressing plate applies pressure to the concrete test piece along the upright post; the deformation acquisition device comprises strain gauges and strain acquisition meters, and a plurality of strain gauges are correspondingly distributed on the concrete test piece and the upright post; the high-temperature furnace and the loading equipment are used for loading temperature and axial stress respectively, so that the environmental requirement on the concrete high-temperature compression test is simply and efficiently met, the strain data of the concrete test piece are analyzed, the stress deformation and the performance degradation mechanism of the concrete under the high-temperature condition are researched, and the technical support is provided for researching the high-temperature and fire-resistant performance of the concrete material.
Description
Technical Field
The invention belongs to the technical field of concrete compression performance tests, and particularly relates to a concrete high-temperature compression performance test device and a concrete high-temperature compression performance test method.
Background
Concrete is one of the most widely used and used building materials in civil engineering, especially in above ground building structures. In recent years, with the continuous acceleration of urban progress in China, urban population density and the number of high-rise buildings are rapidly increased, the use functions of the buildings gradually tend to be diversified and compounded, and building fires of concrete structures frequently occur. In the fire process, building structure concrete is subjected to dual actions of building load and high temperature. Therefore, research on the loading deformation and the performance degradation mechanism of the concrete under the high-temperature condition is particularly important, and the durability and the use function of the concrete structure, particularly the concrete column after a fire disaster can be accurately evaluated.
The research means of the mechanical properties of the high-temperature concrete material mainly comprises an indoor test, wherein the method is to cool a concrete test piece at high temperature and then carry out a loading test to research the strength and deformation characteristics of the concrete material. Obviously, the concrete material test result is different from the actual compressive mechanical property of the concrete at high temperature in fire disaster.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and improve a concrete high-temperature compression performance test device and a test method thereof, wherein the test device has a simple structure and low cost.
In order to achieve the above object, the present invention provides the following technical solutions:
a concrete high temperature compressive property test device, the test device comprising: loading equipment, heating equipment and a deformation acquisition device;
the loading equipment comprises a base and an upper pressing plate, wherein a plurality of stand columns are fixedly connected to the base, the upper pressing plate is connected to the base through the stand columns, and the stand columns penetrate through the upper pressing plate and are connected with nuts through threads; the concrete test piece is correspondingly placed between the base and the upper pressing plate, and the nut is fastened, so that the upper pressing plate applies pressure to the concrete test piece along the upright post;
the deformation acquisition device comprises a strain gauge and a strain acquisition instrument, wherein the strain gauge comprises an axial strain gauge and a circumferential strain gauge;
two axial strain gauges are arranged on the outer side surface of each upright post and the outer side surface of the concrete test piece; two axial strain gauges on a concrete test piece are symmetrically distributed about an axis thereof and are positioned on a cross section passing through a midpoint of the axis; two axial strain gauges on the column are symmetrically distributed about its axis and located on a cross section through its axial midpoint;
the outer side surface of the concrete test piece is also provided with two circumferential strain gauges symmetrically distributed about the axis of the concrete test piece, and the two circumferential strain gauges are positioned on the cross section passing through the midpoint of the axis of the concrete test piece and are staggered with the two axial strain gauges by 90 degrees in the circumferential direction of the concrete test piece;
the loading equipment is placed inside the heating equipment to heat the concrete test piece, and the strain acquisition instrument located outside the heating equipment is electrically connected with the strain gauges to acquire strain data of the strain gauges.
And two axial strain gauges symmetrical to the middle of the upright post are arranged on each upright post.
Preferably, the base is a regular quadrilateral plate, and the upright posts are correspondingly distributed at four corners of the base;
and a lower groove corresponding to the concrete test piece is arranged in the center of the base.
Preferably, the upper pressing plate is a regular quadrilateral plate, and four corners of the upper pressing plate are provided with four perforations corresponding to the upright post; an upper groove corresponding to the lower groove is arranged in the center of the upper pressing plate.
Preferably, the upper groove and the lower groove are both circular, the concrete sample is a cylinder, and the diameters of the upper groove and the lower groove are larger than the diameter of the cylinder by 1-2mm.
Preferably, circular cushion blocks corresponding to the concrete test piece are arranged in the upper groove and the lower groove.
Preferably, the round cushion block, the base, the upper pressing plate, the upright posts and the nuts are all made of high-temperature resistant materials, the high-temperature resistant materials are specifically nickel-based alloys, the nickel-based alloys have a series of excellent performances of high temperature resistance, high hardness, corrosion resistance, high-temperature strength and the like, the tensile strength reaches 550-790MPa, and the mechanical properties are basically unchanged at the temperature of 1000 ℃.
The strain gauge is a high-temperature-resistant strain gauge, and particularly is an iron-nickel-aluminum alloy strain gauge.
Preferably, the pressure applied by the upper pressing plate to the concrete test piece is determined according to the following formula:
P＝kε
wherein P is an axial stress value; k is the elastic modulus of the upright post; epsilon is the axial strain average value of the four upright posts; epsilon= (epsilon) 1 +ε 2 +ε 3 +ε 4 )/4，ε 1 、ε 2 、ε 3 And epsilon 4 The axial strain values of the four upright posts are respectively.
Preferably, the temperature rising device is a high-temperature furnace, and the high-temperature furnace heats the concrete test piece according to a preset temperature rising curve.
A method for testing high-temperature compressive properties of concrete, the method comprising:
step S1, placing a high-temperature-resistant round cushion block in a lower groove of loading equipment, and placing a cylindrical concrete test piece on the round cushion block in the lower groove; placing the other round cushion block on the upper surface of the concrete test piece, and correspondingly connecting an upper pressing plate with the upright post to cover the upper groove on the round cushion block at the upper end of the concrete test piece; the positions of the concrete test piece and the round cushion block are adjusted, so that the concrete test piece is coaxially distributed with the upper groove and the lower groove;
step S2, sticking a strain gauge, correspondingly connecting the strain gauge with a strain acquisition instrument, and starting the strain acquisition instrument; wherein the strain gauge comprises an axial strain gauge and a circumferential strain gauge;
two axial strain gauges are arranged on the outer side surface of each upright post and the outer side surface of the concrete test piece; two axial strain gauges on a concrete test piece are symmetrically distributed about an axis thereof and are positioned on a cross section passing through a midpoint of the axis; two axial strain gauges on the column are symmetrically distributed about its axis and located on a cross section through its axial midpoint;
the outer side surface of the concrete test piece is also provided with two circumferential strain gauges symmetrically distributed about the axis of the concrete test piece, and the two circumferential strain gauges are positioned on the cross section passing through the midpoint of the axis of the concrete test piece and are staggered with the two axial strain gauges by 90 degrees in the circumferential direction of the concrete test piece;
step S3, correspondingly connecting nuts on external threads at the upper end of the upright post;
s4, synchronously screwing the four nuts through a bolt fastening device to enable the axial pressure of the concrete test piece to reach a preset pressure, and correspondingly measuring strain data of each strain gauge;
s5, standing for 5-10min to enable the concrete test piece to reach an equilibrium state;
s6, placing the loading equipment and the concrete test piece in a high-temperature furnace, and heating the concrete test piece according to a standard fire heating curve specified by the international standard ISO 834; collecting and storing strain data of the strain gauge through a strain collecting instrument;
and S6, after heating, closing the high-temperature furnace, cooling the loading equipment and the concrete test piece, and taking out the concrete test piece to finish the test.
The beneficial effects are that: the device has the advantages of simple structure, convenient operation, and simple and efficient completion of environmental requirements on the concrete high-temperature compression test by respectively carrying out temperature and axial stress loading through the high-temperature furnace and the loading equipment, and provides technical support for researching the high temperature and fire resistance of the concrete material by analyzing the strain data of the concrete test piece and researching the loading deformation and the performance degradation mechanism of the concrete under the high-temperature condition.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Wherein:
FIG. 1 is a schematic diagram of a loading device according to an embodiment of the present invention;
FIG. 2 is a simplified cross-sectional view of a loading apparatus provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of strain gauge distribution on a concrete test piece provided in an embodiment of the present invention; .
In the figure: 1. a base; 2. an upper press plate; 3. a screw cap; 4. a column; 5. a concrete test piece; 6. a round cushion block; 7. an axial strain gauge; 8. and a circumferential strain gauge.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
As shown in fig. 1 to 3, a concrete high temperature compression performance test apparatus, the test apparatus comprises: loading equipment, heating equipment and a deformation acquisition device; the loading equipment comprises a base 1 and an upper pressing plate 2, wherein a plurality of upright posts 4 are fixedly connected to the base 1, the upper pressing plate 2 is connected to the base 1 through the upright posts 4, and the upright posts 4 penetrate through the upper pressing plate 2 and then are connected with screw caps 3 through threads; the concrete test piece 5 is correspondingly placed between the base 1 and the upper pressing plate 2, and the nuts 3 are fastened, so that the upper pressing plate 2 applies pressure to the concrete test piece 5 along the upright posts 4; the deformation acquisition device comprises a strain gauge and a strain acquisition instrument, wherein the strain gauge comprises an axial strain gauge and a circumferential strain gauge, and two axial strain gauges are arranged on the outer side surface of each upright post and the outer side surface of a concrete test piece; two axial strain gauges on a concrete test piece are symmetrically distributed about an axis thereof and are positioned on a cross section passing through a midpoint of the axis; two axial strain gauges on the column are symmetrically distributed about its axis and located on a cross section through its axial midpoint;
the outer side surface of the concrete test piece is also provided with two annular strain gauges symmetrically distributed on the axis of the concrete test piece, and the two annular strain gauges are positioned on the cross section passing through the midpoint of the axis of the concrete test piece and are staggered with the two axial strain gauges by 90 degrees in the circumferential direction of the concrete test piece, so that ten axial strain data and two annular strain data are obtained. The loading equipment is placed inside the temperature rising equipment to heat the concrete test piece 5, and the strain acquisition instrument located outside the temperature rising equipment is electrically connected with a plurality of strain gauges to acquire strain data of the strain gauge.
And (3) respectively carrying out temperature rise and axial stress loading through a high-temperature furnace and loading equipment, analyzing strain data of the concrete test piece 5 through a strain gauge and a strain acquisition instrument, and researching loading deformation and performance degradation mechanisms of the concrete under the high-temperature condition.
The base 1 is a regular quadrilateral plate, and the upright posts 4 are correspondingly distributed at four corners of the base 1; a lower groove corresponding to the concrete test piece 5 is arranged at the center of the base 1. The upper pressing plate 2 is a regular quadrilateral plate, and four corners of the upper pressing plate 2 are provided with four perforations corresponding to the upright posts 4; an upper groove corresponding to the lower groove is arranged at the center of the upper pressing plate 2. The pressure applied by the upper pressing plate 2 to the concrete test piece 5 is balanced.
In this embodiment, the upper groove and the lower groove are both circular, the concrete specimen 5 is a cylinder, and the diameters of the upper groove and the lower groove are larger than the diameter of the cylinder by 1-2mm.
Circular cushion blocks 6 corresponding to the concrete test piece 5 are arranged in the upper groove and the lower groove, and the circular cushion blocks 6 are made of high-temperature resistant materials.
In the embodiment, the round cushion block 6, the base 1, the upper pressing plate 2, the upright post 4 and the screw cap 3 are all made of high-temperature resistant materials; the high-temperature resistant material is nickel-base alloy, which has a series of excellent performances of high temperature resistance, high hardness, corrosion resistance, high-temperature strength and the like, the tensile strength reaches 550-790MPa, and the mechanical property is basically unchanged at the temperature of 1000 ℃. The strain gauge is a high-temperature-resistant strain gauge, in particular to an iron-nickel-aluminum alloy strain gauge. Has stable characteristic under high temperature environment, and meets the test requirement under high temperature environment.
The pressure applied by the upper platen 2 to the concrete test piece 5 is determined according to the following formula:
P＝kε
wherein P is an axial stress value; k is the elastic modulus of the upright post; epsilon is the axial strain average value of the four upright posts; epsilon= (epsilon) 1 +ε 2 +ε 3 +ε 4 )/4，ε 1 、ε 2 、ε 3 And epsilon 4 The axial strain values of the four upright posts are respectively.
The temperature rising equipment is a high-temperature furnace, and the high-temperature furnace heats the concrete test piece 5 according to a preset temperature rising curve. The internal space of the high-temperature furnace meets the test requirement, and the high-temperature furnace is provided with a control device and can heat according to a preset temperature rising curve.
The invention also provides a method for testing the high-temperature compressive property of the concrete, which comprises the following steps:
step S1, placing a high-temperature-resistant round cushion block 6 in a lower groove of loading equipment, and placing a cylindrical concrete test piece 5 on the round cushion block 6 in the lower groove; placing the other round cushion block 6 on the upper surface of the concrete test piece 5, correspondingly connecting the upper pressing plate 2 with the upright post 4, and covering the upper groove on the round cushion block 6 at the upper end of the concrete test piece 5; the positions of the concrete test piece 5 and the round cushion block 6 are adjusted, so that the concrete test piece 5 is coaxially distributed with the upper groove and the lower groove;
step S2, sticking a strain gauge, correspondingly connecting the strain gauge with a strain acquisition instrument, and starting the strain acquisition instrument; the strain gauge comprises an axial strain gauge and a circumferential strain gauge;
two axial strain gauges are arranged on the outer side surface of each upright post and the outer side surface of the concrete test piece; two axial strain gauges on a concrete test piece are symmetrically distributed about an axis thereof and are positioned on a cross section passing through a midpoint of the axis; two axial strain gauges on the column are symmetrically distributed about its axis and located on a cross section through its axial midpoint;
the outer side surface of the concrete test piece is also provided with two circumferential strain gauges symmetrically distributed about the axis of the concrete test piece, and the two circumferential strain gauges are positioned on the cross section passing through the midpoint of the axis of the concrete test piece and are staggered with the two axial strain gauges by 90 degrees in the circumferential direction of the concrete test piece;
step S3, correspondingly connecting the nuts 3 on external threads at the upper end of the upright post 4;
s4, synchronously screwing the four nuts 3 through a bolt fastening device to enable the axial pressure of the concrete test piece 5 to reach a preset pressure, and correspondingly measuring strain data of each strain gauge;
s5, standing for 5-10min to enable the concrete test piece 5 to reach an equilibrium state;
s6, placing the loading equipment and the concrete test piece 5 in a high-temperature furnace, and heating the concrete test piece according to a standard fire heating curve specified by the international standard ISO 834; collecting and storing strain data of the strain gauge through a strain collecting instrument;
and S6, after heating, closing the high-temperature furnace, cooling the loading equipment and the concrete test piece 5, and taking out the concrete test piece and completing the test.
The strain acquisition instrument is a common acquisition instrument and has a continuous strain acquisition function. The strain gauge has more than sixteen channels.
In step S4, four nuts 3 are fastened synchronously by the intelligent bolt fastening device, and one nut 3 is additionally arranged on each upright post 4 to strengthen the limit of the upper pressing plate.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A concrete high temperature compressive property test device, characterized in that, the test device includes: loading equipment, heating equipment and a deformation acquisition device;
the loading equipment comprises a base and an upper pressing plate, wherein a plurality of stand columns are fixedly connected to the base, the upper pressing plate is connected to the base through the stand columns, and the stand columns penetrate through the upper pressing plate and are connected with nuts through threads; the concrete test piece is correspondingly placed between the base and the upper pressing plate, and the nut is fastened, so that the upper pressing plate applies pressure to the concrete test piece along the upright post;
the deformation acquisition device comprises a strain gauge and a strain acquisition instrument, wherein the strain gauge comprises an axial strain gauge and a circumferential strain gauge;
two axial strain gauges are arranged on the outer side surface of each upright post and the outer side surface of the concrete test piece; two axial strain gauges on a concrete test piece are symmetrically distributed about an axis thereof and are positioned on a cross section passing through a midpoint of the axis; two axial strain gauges on the column are symmetrically distributed about its axis and located on a cross section through its axial midpoint;
the outer side surface of the concrete test piece is also provided with two circumferential strain gauges symmetrically distributed about the axis of the concrete test piece, and the two circumferential strain gauges are positioned on the cross section passing through the midpoint of the axis of the concrete test piece and are staggered with the two axial strain gauges by 90 degrees in the circumferential direction of the concrete test piece;
the loading equipment is placed inside the heating equipment to heat the concrete test piece, and the strain acquisition instrument located outside the heating equipment is electrically connected with the strain gauges to acquire strain data of the strain gauges.
2. The concrete high-temperature compressive property test device according to claim 1, wherein the base is a regular quadrilateral plate, and the upright posts are correspondingly distributed at four corners of the base;
and a lower groove corresponding to the concrete test piece is arranged in the center of the base.
3. The concrete high-temperature compression performance test device according to claim 2, wherein the upper pressing plate is a regular quadrilateral plate, and four corners of the upper pressing plate are provided with four perforations corresponding to the upright post; an upper groove corresponding to the lower groove is arranged in the center of the upper pressing plate.
4. The concrete high-temperature compressive property testing apparatus according to claim 3, wherein the upper groove and the lower groove are both circular, the concrete test piece is a cylinder, and the diameters of the upper groove and the lower groove are larger than the diameter of the cylinder by 1-2mm.
5. The concrete high-temperature compressive property testing apparatus according to claim 4, wherein,
and circular cushion blocks corresponding to the concrete test piece are arranged in the upper groove and the lower groove.
6. The concrete high-temperature compression performance test device according to claim 5, wherein the round cushion block, the base, the upper pressing plate, the upright post and the screw cap are all made of high-temperature resistant materials;
the strain gauge is a high temperature resistant strain gauge.
7. The concrete high-temperature compressive property testing apparatus according to claim 1, wherein the pressure applied by the upper platen to the concrete test piece is determined according to the following formula:
P＝kε
wherein P is an axial stress value; k is the elastic modulus of the upright post; epsilon is the axial strain average value of the four upright posts; epsilon= (epsilon) 1 +ε 2 +ε 3 +ε 4 )/4，ε 1 、ε 2 、ε 3 And epsilon 4 The axial strain values of the four upright posts are respectively.
8. The concrete high-temperature compressive property testing apparatus according to claim 1, wherein the temperature raising device is a high-temperature furnace, and the high-temperature furnace heats the concrete test piece according to a standard fire temperature raising curve specified by international standard ISO 834.
9. A method for testing high-temperature compressive properties of concrete, the method comprising:
step S1, placing a high-temperature-resistant round cushion block in a lower groove of loading equipment, and placing a cylindrical concrete test piece on the round cushion block in the lower groove; placing the other round cushion block on the upper surface of the concrete test piece, and correspondingly connecting an upper pressing plate with the upright post to cover the upper groove on the round cushion block at the upper end of the concrete test piece; the positions of the concrete test piece and the round cushion block are adjusted, so that the concrete test piece is coaxially distributed with the upper groove and the lower groove;
step S2, sticking a strain gauge, correspondingly connecting the strain gauge with a strain acquisition instrument, and starting the strain acquisition instrument; the strain gauge comprises an axial strain gauge and a circumferential strain gauge;
two axial strain gauges are arranged on the outer side surface of each upright post and the outer side surface of the concrete test piece; two axial strain gauges on a concrete test piece are symmetrically distributed about an axis thereof and are positioned on a cross section passing through a midpoint of the axis; two axial strain gauges on the column are symmetrically distributed about its axis and located on a cross section through its axial midpoint;
the outer side surface of the concrete test piece is also provided with two circumferential strain gauges symmetrically distributed about the axis of the concrete test piece, and the two circumferential strain gauges are positioned on the cross section passing through the midpoint of the axis of the concrete test piece and are staggered with the two axial strain gauges by 90 degrees in the circumferential direction of the concrete test piece;
step S3, correspondingly connecting nuts on external threads at the upper end of the upright post;
s4, synchronously screwing the four nuts through a bolt fastening device to enable the axial pressure of the concrete test piece to reach a preset pressure, and correspondingly measuring strain data of each strain gauge;
s5, standing for 5-10min to enable the concrete test piece to reach an equilibrium state;
s6, placing the loading equipment and the concrete test piece in a high-temperature furnace, and heating the concrete test piece according to a standard fire heating curve specified by the international standard ISO 834; collecting and storing strain data of the strain gauge through a strain collecting instrument;
and S6, after heating, closing the high-temperature furnace, cooling the loading equipment and the concrete test piece, and taking out the concrete test piece to finish the test.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090077524A (en) * | 2008-01-11 | 2009-07-15 | 충남대학교산학협력단 | Tester and test method for mechanical properties of concrete at high tempreature |
| CN104165807A (en) * | 2014-08-13 | 2014-11-26 | 浙江大学 | Large-deflection destruction testing device and method for prestressed concrete plate beam |
| CN105424498A (en) * | 2015-12-21 | 2016-03-23 | 郑州大学 | Concrete material in-high-temperature compression testing machine and in-high-temperature compression testing method |
| CN107167368A (en) * | 2017-05-16 | 2017-09-15 | 华侨大学 | A kind of non-surrounding is by concrete column pseudo static testing device and its implementation after fire |
-
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- 2021-08-31 CN CN202111016222.9A patent/CN113776955B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090077524A (en) * | 2008-01-11 | 2009-07-15 | 충남대학교산학협력단 | Tester and test method for mechanical properties of concrete at high tempreature |
| CN104165807A (en) * | 2014-08-13 | 2014-11-26 | 浙江大学 | Large-deflection destruction testing device and method for prestressed concrete plate beam |
| CN105424498A (en) * | 2015-12-21 | 2016-03-23 | 郑州大学 | Concrete material in-high-temperature compression testing machine and in-high-temperature compression testing method |
| CN107167368A (en) * | 2017-05-16 | 2017-09-15 | 华侨大学 | A kind of non-surrounding is by concrete column pseudo static testing device and its implementation after fire |
Non-Patent Citations (1)
| Title |
|---|
| 高温作用后钢筋混凝土短柱轴压力学性能试验研究;张家广;霍静思;肖岩;;建筑结构学报;20110405(第04期);全文 * |
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