CN111678767A - Load holding device for concrete eccentric compression member in erosion service environment and working process thereof - Google Patents
Load holding device for concrete eccentric compression member in erosion service environment and working process thereof Download PDFInfo
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- CN111678767A CN111678767A CN202010587971.6A CN202010587971A CN111678767A CN 111678767 A CN111678767 A CN 111678767A CN 202010587971 A CN202010587971 A CN 202010587971A CN 111678767 A CN111678767 A CN 111678767A
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- finish rolling
- strain gauge
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- 230000003628 erosive effect Effects 0.000 title claims description 19
- 230000006835 compression Effects 0.000 title claims description 17
- 238000007906 compression Methods 0.000 title claims description 17
- 239000004567 concrete Substances 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000005096 rolling process Methods 0.000 claims abstract description 51
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 28
- 238000013461 design Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 description 7
- 238000012669 compression test Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010998 test method Methods 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
- G01N3/02—Details
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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
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The load holding device comprises a member, a prestressed finish-rolled threaded steel bar and a cylindrical steel sleeve, wherein the member is a reinforced concrete column with brackets at two ends, and the prestressed finish-rolled threaded steel bar is horizontally arranged and penetrates through two bracket parts of the reinforced concrete column; the outer side ends of the two bracket parts are respectively provided with a finish rolling nut B and a finish rolling nut C so as to be screwed with the two ends of the prestressed finish rolling twisted steel; the cylindrical steel sleeve is located between the outer side end of the bracket part and the finish rolling nut B, the outer surface of the cylindrical steel sleeve is smooth and is adhered with a strain gauge, and the strain gauge is connected with a resistance strain gauge through a connecting lead. According to the invention, a continuous load can be applied to the component without using a reaction frame, and the load value is measured by using the strain gauge and the resistance strain gauge, so that the space occupied by the device is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of civil construction, and relates to a loading and load-holding device for a reinforced concrete compression test, in particular to a concrete eccentric compression member load-holding device in an erosion service environment and a working process thereof.
Background
The reinforced concrete column is the main vertical stressed member of the frame structure house, and the mechanical property of the reinforced concrete column is directly related to the safety of the structure. The reinforced concrete column can be subjected to the combined action of bending moment and axial force, and the eccentric compression test can simulate the stress state. Therefore, one of the most important test methods for studying the mechanical properties of the reinforced concrete column is an eccentric compression test of the reinforced concrete column.
The reinforced concrete member in the corrosion service environment has the defects that the durability of the reinforced concrete structure is reduced due to the degradation of the mechanical property of the concrete, the corrosion of reinforcing steel bars and the like. Therefore, it is important to develop a research based on the compressive resistance of the reinforced concrete member in an erosion environment. In recent years, the research on the durability of reinforced concrete structures mostly adopts that components are taken out after being placed in an erosion environment for a period of time to directly perform mechanical property tests, and the actual structural service stress characteristic cannot be considered. The invention mainly adopts a novel long-term load holding device for a concrete compression member, so that the member is in a long-term load holding state, the member and the load holding device are integrally placed in an erosion environment, the member is in a load and erosion environment coupling state, the actual engineering structure erosion environment service state is simulated, the member is taken out after a period of time to perform a mechanical property test, and the influence of the load and erosion environment coupling effect on the mechanical property and the durability of the member is researched.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the load holding device which has a simple structure, can accurately and quickly carry out experimental operation, does not cause local crushing, can be used for a reinforced concrete compression member for a long time and is simple and convenient to operate, namely, the load holding device for the concrete eccentric compression member in an erosion service environment and the working process thereof.
The purpose of the invention can be realized by the following technical scheme:
the load holding device is characterized by comprising a member, a prestressed finish rolling threaded steel bar and a cylindrical steel sleeve, wherein the member is a reinforced concrete column with brackets at two ends, and the prestressed finish rolling threaded steel bar is horizontally arranged and penetrates through two bracket parts of the reinforced concrete column; the outer side ends of the two bracket parts are respectively provided with a finish rolling nut B and a finish rolling nut C so as to be screwed with the two ends of the prestressed finish rolling twisted steel; the cylindrical steel sleeve is located between the outer side end of the bracket part and the finish rolling nut B, the outer surface of the cylindrical steel sleeve is smooth and is adhered with a strain gauge, and the strain gauge is connected with a resistance strain gauge through a connecting lead.
Furthermore, a drawing instrument is arranged on the prestressed finish-rolled threaded steel bar on the outer side of the finish-rolled nut B.
Furthermore, a rectangular hollow steel pier is clamped between the drawing instrument and the bracket part, and two ends of the rectangular hollow steel pier are respectively provided with a preformed hole for the prestressed finish rolling threaded steel bar to pass through; and the diameter of the preformed hole attached to the bracket part is larger than the outer diameter of the cylindrical steel sleeve.
Furthermore, a finish rolling nut A is arranged at the outer side end of the drawing instrument and is screwed with the prestress finish rolling threaded steel bar.
Furthermore, steel washers are arranged at the positions of the finish rolling nut A, the finish rolling nut B and the finish rolling nut C.
The working process of the concrete eccentric compression member load holding device in the erosion service environment is characterized in that in the test process, a feed-through drawing instrument is manually operated to convey oil, and the prestressed threaded steel bar is pulled to bear force until a certain load value is reached; then screwing the finish rolling nut B, completely discharging oil in the straight-through drawing instrument, and observing the load value of the resistance strain gauge;
because the device has prestress loss, the load value of the resistance strain gauge does not reach the preset design value, at the moment, the drawing gauge is supplied with oil again for pressurization until the finish rolling nut B is screwed again and the oil cylinder of the drawing gauge is loosened, and the load value is the preset design value;
and then the finish rolling nut A, the drawing instrument and the rectangular hollow steel pier are removed, the prestressed finish rolling twisted steel shrinks to drive the reinforced concrete member to bear eccentric pressure, and the numerical value of the eccentric pressure is measured through the resistance strain gauge.
The invention has the following characteristics:
1. the invention can be used as a long-term load-holding device for a reinforced concrete compression member, and has simple structure and easy operation;
2. according to the invention, a continuous load can be applied to the component without using a reaction frame, and the load value is measured by using the strain gauge and the resistance strain gauge, so that the space occupied by the device is greatly reduced;
3. the invention can realize the long-term load holding requirement of the component in the erosion environment by manually operating the loading of the drawing instrument and integrally placing the component and the device in the erosion environment.
Drawings
FIG. 1 is a schematic structural view of the present invention under compressive loading;
FIG. 2 is a schematic structural diagram of the present invention during long-term loading;
FIG. 3 is a schematic view of a steel washer;
FIG. 4 is a schematic view of a finish rolling nut;
in the figure: 1 is reinforced concrete column, 2 is prestressing finish rolling twisted steel, 3 is the resistance strain gauge, 4 is the resistance strain gauge, 5 is finish rolling nut A, 6 is cylindrical steel sleeve, 7 is the steel mound, 8 is the appearance is drawn to the punching, 9 is the steel packing ring, 10 is connecting wire, 11 is finish rolling nut B, 12 is finish rolling nut C.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The load holding device for the concrete eccentric compression member in the erosion service environment can be in a compression loading state and a long-term load holding state.
As shown in figure 1, when the steel bar concrete member is used as a reinforced concrete member and is loaded under pressure, the steel bar concrete member comprises a reinforced concrete column 1, a prestressed finish-rolled threaded steel bar 2, a resistance strain gauge 3, a resistance strain gauge 4, a finish-rolled nut A5, a cylindrical steel sleeve 6, a steel pier 7, a feed-through drawbench 8, a steel washer 9, a connecting wire 10, a finish-rolled nut B11 and a finish-rolled nut C12.
The component is a reinforced concrete column with brackets at two ends, the steel pier is a rectangular hollow steel pier, the left side and the right side of the steel pier are respectively provided with a preformed hole, the aperture of the preformed holes at two sides is larger than the diameter of a prestressed finish rolling threaded steel bar 2, the diameter of the preformed hole at the left side is larger than that of the preformed hole at the right side, and the diameter of the preformed hole at the left side is larger than that of a cylindrical steel sleeve. The inner diameter of the steel washer is larger than the diameter of the prestressed finish rolling twisted steel, the outer diameter of the steel washer is larger than the diameter of an outer circle of the finish rolling nut, and the finish rolling nut is a hexagon nut.
The prestressed finish rolling threaded steel bar 2 is respectively penetrated through two bracket parts of the reinforced concrete column 1, the steel pier 7 and the feed-through drawing instrument 8, and two ends of the device are respectively fixed by a steel washer 9, a finish rolling nut A5, a steel washer 9 and a finish rolling nut C12.
The surface of the cylindrical steel sleeve 6 is pasted with a resistance strain gauge 3 which is also used as a load sensor, the resistance strain gauge 3 is connected with a resistance strain gauge 4 through a connecting lead 10, when the cylindrical steel sleeve 6 is pressed, the magnitude of the compressive strain can be displayed by the resistance strain gauge 4 and is converted into the pressure applied to the cylindrical steel sleeve 6 through calculation, and the pressure applied to the cylindrical steel sleeve 6 is the pressure applied to a component.
The steel pier is made of stainless steel, and the reinforced concrete compression member loading device applies load through a manually operated drawing instrument.
In the test process, the manual operation of the straight-through drawing instrument 8 is used for oil transportation, the prestressed threaded steel bar 2 is pulled to bear force until a certain load value is reached, then the finish rolling nuts B11 positioned in the middle of the preformed holes at the two sides of the steel pier 7 are screwed, the oil in the straight-through drawing instrument 8 is completely discharged, at the moment, the load value of the resistance strain instrument 4 is observed, and because the device has prestress loss, so that the load value of the resistance strain gauge 4 does not reach the preset design value, the oil feed of the cross-core drawing instrument 8 is pressurized again until the finish rolling nut B11 is tightened again, the load value is the preset design value when the oil cylinder of the cross-core drawing instrument 8 is loosened, and then the finish rolling nut A5, the steel washer 9, the straight-through drawing instrument 8 and the steel pier 7 on the right side are removed, at the moment, the prestressed finish rolling deformed steel bar 2 contracts to drive the reinforced concrete member 1 to bear eccentric pressure, and the eccentric compression load value is measured through the resistance strain gauge 4. At this time, the long-term load-bearing device of the reinforced concrete compression member shown in fig. 2 is obtained.
Finally, the present invention is not limited to the above-described embodiments, and many modifications may be made on the basis of the essence of the present invention, and all modifications directly conceivable by those skilled in the art on the basis of the contents of the present invention are to be considered as the scope of protection of the present invention.
Claims (6)
1. The load holding device is characterized by comprising a member, a prestressed finish rolling threaded steel bar and a cylindrical steel sleeve, wherein the member is a reinforced concrete column with brackets at two ends, and the prestressed finish rolling threaded steel bar is horizontally arranged and penetrates through two bracket parts of the reinforced concrete column; the outer side ends of the two bracket parts are respectively provided with a finish rolling nut B and a finish rolling nut C so as to be screwed with the two ends of the prestressed finish rolling twisted steel; the cylindrical steel sleeve is located between the outer side end of the bracket part and the finish rolling nut B, the outer surface of the cylindrical steel sleeve is smooth and is adhered with a strain gauge, and the strain gauge is connected with a resistance strain gauge through a connecting lead.
2. The device for holding the eccentric compression member of the concrete in the erosion service environment as claimed in claim 1, wherein a drawing instrument is arranged on the prestressed finish-rolled threaded steel bar outside the finish-rolled nut B.
3. The concrete eccentric compression member load-bearing device under the erosion service environment of claim 2, wherein a rectangular hollow steel pier is clamped between the drawing instrument and the bracket part, and two ends of the rectangular hollow steel pier are respectively provided with a reserved hole for a prestressed finish-rolled threaded steel bar to pass through; and the diameter of the preformed hole attached to the bracket part is larger than the outer diameter of the cylindrical steel sleeve.
4. The device for holding the eccentrically pressed concrete member in an erosive service environment according to claim 3, wherein a finish rolling nut A is provided at an outer end of the drawing instrument to be screwed with the prestressed finish rolling deformed bar.
5. The device for holding the eccentric compression member of the concrete in the erosion service environment as claimed in claim 4, wherein steel washers are arranged at the positions of the finish rolling nut A, the finish rolling nut B and the finish rolling nut C.
6. The working process of the concrete eccentric compression member load-holding device in the erosion service environment according to claim 4, wherein in the test process, the feed-through drawing instrument is manually operated to feed oil, and the prestressed threaded steel bar is pulled to bear force until a certain load value is reached; then screwing the finish rolling nut B, completely removing oil in the straight-through drawing instrument, and observing the load value of the resistance strain gauge;
because the device has prestress loss, the load value of the resistance strain gauge does not reach the preset design value, at the moment, the drawing gauge is supplied with oil again for pressurization until the finish rolling nut B is screwed again and the oil cylinder of the drawing gauge is loosened, and the load value is the preset design value;
and then the finish rolling nut A, the drawing instrument and the rectangular hollow steel pier are removed, the prestressed finish rolling twisted steel shrinks to drive the reinforced concrete member to bear eccentric pressure, and the eccentric stressed load value is measured through the resistance strain gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010587971.6A CN111678767A (en) | 2020-06-24 | 2020-06-24 | Load holding device for concrete eccentric compression member in erosion service environment and working process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010587971.6A CN111678767A (en) | 2020-06-24 | 2020-06-24 | Load holding device for concrete eccentric compression member in erosion service environment and working process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111678767A true CN111678767A (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010587971.6A Pending CN111678767A (en) | 2020-06-24 | 2020-06-24 | Load holding device for concrete eccentric compression member in erosion service environment and working process thereof |
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| Country | Link |
|---|---|
| CN (1) | CN111678767A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726439A (en) * | 2009-12-18 | 2010-06-09 | 东南大学 | Method for testing concrete performance under pressure stress-chemical coupling effect and device thereof |
| CN102374950A (en) * | 2011-11-16 | 2012-03-14 | 浙江建设职业技术学院 | Test device for service performance of reinforced column under load and environment coupled action |
| CN206920254U (en) * | 2017-06-13 | 2018-01-23 | 江苏大学 | A kind of concrete component that is used for is for a long time by the loading device of curved experiment |
| CN212646284U (en) * | 2020-06-24 | 2021-03-02 | 扬州大学 | Load holding device for concrete eccentric compression member in erosion service environment |
-
2020
- 2020-06-24 CN CN202010587971.6A patent/CN111678767A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726439A (en) * | 2009-12-18 | 2010-06-09 | 东南大学 | Method for testing concrete performance under pressure stress-chemical coupling effect and device thereof |
| CN102374950A (en) * | 2011-11-16 | 2012-03-14 | 浙江建设职业技术学院 | Test device for service performance of reinforced column under load and environment coupled action |
| CN206920254U (en) * | 2017-06-13 | 2018-01-23 | 江苏大学 | A kind of concrete component that is used for is for a long time by the loading device of curved experiment |
| CN212646284U (en) * | 2020-06-24 | 2021-03-02 | 扬州大学 | Load holding device for concrete eccentric compression member in erosion service environment |
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Application publication date: 20200918 |