CN105699190B - A kind of experimental rig for testing FRP cloth stress relaxation - Google Patents
A kind of experimental rig for testing FRP cloth stress relaxation Download PDFInfo
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- CN105699190B CN105699190B CN201610226567.XA CN201610226567A CN105699190B CN 105699190 B CN105699190 B CN 105699190B CN 201610226567 A CN201610226567 A CN 201610226567A CN 105699190 B CN105699190 B CN 105699190B
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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
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Abstract
The invention discloses a kind of experimental rigs for testing FRP cloth stress relaxation.The device includes fixing end, stretching end and lapping plate.Fixing end is made of fixing end fixture, bottom plate and ribbed stiffener.Stretching end is made of stretching end fixture, the vertical baffle of stretching end, horizontal cushion block and bottom plate.Lapping plate is connect integral by bolt with the bottom plate of fixing end and stretching end.Fixing end fixture is welded by two pieces of horizontal steel plates and one block of vertical steel plate.A groove is opened among upper horizontal steel plate and above vertical steel plate, forms a trepanning.Stretching end fixture is welded into U-shaped steel plate by two pieces of horizontal steel plates and one block of vertical steel plate.The experimental rig simple structure, it is easy to assembly, it takes up space small.Only a spanner is needed to can be completed to the prestressed loading of FRP cloth item, operability is strong, and the width and adjustable in length for the FRP cloth tested.
Description
Technical field
The invention belongs to civil engineering structure field, more particularly to a kind of experimental rig for testing FRP cloth stress relaxation.It should
Experimental rig suitable for pre-stress FRP cloth structural strengthening caused by stress relaxation loss of prestress amount determine.
Background technology
In recent years, the structure that builds a bridge for needing reinforcement and strengthening is increased, and traditional reinforcing mode has section-increased method, glues
Steel method for strengthening and it is viscous fiber cloth reinforced the methods of.Wherein carbon fibre reinforced polymer method for strengthening is again with its is easy for construction, does not increase building
The advantages such as object dead weight are used widely in recent years, but following using rear problem.First, through lot of documents experimental study table
Bright, the bearing capacity which can improve component is limited, and the characteristics of fail to give full play to fiber cloth high intensity, utilization ratio
It is relatively low；Secondly, the colloid endurance quality used in viscose fibre cloth is relatively low, after knot is hard, is chronically exposed to easy to aging in air, causes
The stripping of carbon cloth entirety comes off, so as to lose consolidation effect.In order to solve these problems, FRP fiber cloths can be applied pre-
Stress so as to carry out active reinforcing to structure, allows the high-tensile of FRP to be not fully exerted, and improves the use effect of fiber cloth
Rate, and prestressing force can reduce fracture width, and the effectively further development of control critical eigenvalue.Meanwhile it has been investigated that reinforcing side
The method that the bearing capacity ratio that method can improve component is commonly pasted is high.In order to promote and apply, in pre-stress fibre sheet material reinforcing process
Loss of prestress it is still necessary to further study, especially its stress relaxation lose.At present to FRP fiber cloth stress relaxation researchs compared with
Few, only indivedual scholar have carried out preliminary test research, but its testing equipment is more to the stress relaxation of different FRP materials both at home and abroad
Complexity needs special loading equipemtn, and the Length x Width for testing cloth is smaller.In order to deeper into research and determining FRP material
Stress relaxation ability, using simple structure, loading is convenient, test specimen FRP cloth length and the adjustable special FRP cloth stress of width
Relaxation test device has good practical value.By a large amount of pre-stress FRP cloth stress relaxation tests, obtain under different condition
The total stress relaxation number of FRP cloth and stress relaxation rate determine that FRP cloth stress relaxation calculates model and calculation formula provides to be reasonable
Data are supported, analyze the relaxation property of FRP material to the issuable influence of its engineering application, fiber reinforced to pre-stress FRP
Technology has good impetus.
Invention content
The object of the present invention is to provide a kind of experimental rigs for testing FRP cloth stress relaxation.
The invention is realized in this way：A kind of experimental rig for testing FRP cloth stress relaxation, including fixing end, stretching end
And lapping plate；Fixing end is made of bottom plate, fixing end fixture and ribbed stiffener；Stretching end is erected by bottom plate, stretching end fixture, stretching end
It is formed to baffle and horizontal cushion block；Lapping plate is connect integral by anchor bolt with bottom plate.
Fixing end fixture is welded by two pieces of horizontal steel plates and one block of vertical steel plate, and two anchors are opened at horizontal steel plate both ends
Hole, aperture and its spacing with fixed fiber cloth Self-locking type ground tackle two anchor holes it is consistent, two pieces of horizontal steel plates it is vertical net
Away from the thickness by Self-locking type ground tackle along with four pieces of leveling plates thickness determine that the length of horizontal steel plate and vertical steel plate passes through
Respectively 20 millimeters of stretching determines the length of Self-locking type ground tackle on both sides again；The width of horizontal steel plate adds perpendicular for the width of Self-locking type ground tackle
The thickness of plate adds 10 millimeters；The height of vertical steel plate is 110~120 millimeters；Upper horizontal steel plate centre and vertical steel plate
A groove is opened in top, forms a trepanning and is passed through for FRP cloth；Vertical steel plate welds together with fixing end bottom plate；Ribbed stiffener is
The two equilateral length of sides are 60~70 millimeters of isosceles right triangle steel plate；Ribbed stiffener sets 4, in the vertical steel plate of fixing end fixture
Trepanning both sides are per side two；Ribbed stiffener two is equilateral to be welded with the vertical steel plate of fixing end fixture and fixing end bottom plate, and it is solid to play reinforcement
The effect of fixed end rigidity.
Stretching end fixture is welded into U-shaped steel plate by two pieces of horizontal steel plates and one block of vertical steel plate；Clear distance between horizontal steel plate,
The length of horizontal and vertical steel plate and the anchor hole spacing at horizontal steel plate both ends are identical with fixing end fixture；The width of horizontal steel plate
Width for fixing end fixture horizontal steel plate adds 10 millimeters plus the thickness of stretching anchor rod end；Stretching end fixture it is vertical
It opens the screw hole of a diameter of 20 millimeters and is passed through for stretching anchor rod in steel plate center；A height of 160 millimeters of the vertical baffle of stretching end, in tensioning
An equal amount of anchor hole is opened at the corresponding position of vertical steel plate trepanning projection of end fixture to pass through for stretching anchor rod；Stretching end is horizontal
Cushion block is located at stretching end bottom end both sides, with bottom plate and the vertical baffle welding of stretching end；Horizontal 1400 millimeters of cushion block length, it is wide by 20
Millimeter, it is 20~30 millimeters high, thereon place stretching end fixture.
Bottom plate is integral by anchor bolts with lapping plate, and the length of lap segment is 800 millimeters, is advised by different length
The lapping plate of lattice adjusts the length of stress relaxation test device, and the FRP cloth width that Self-locking type ground tackle is anchored can be at 150 millimeters
In the range of adjust, thus allow for different in width and length pre-stress FRP cloth stress relaxation test.
The steel plate is using Q235B grades and above high-quality steel, and wherein fixing end fixture and stretching end fixture is vertical
Steel plate and the vertical baffle plate thickness of stretching end are 30 millimeters, and the horizontal steel plate thickness of fixing end fixture and stretching end fixture is 15 millis
Rice, other steel plates are required to thickness >=20 millimeter；Stretching anchor rod and anchorage bolt use 12.9 grades of high strength anchor bar, shearing resistance
Shearing stress grade is 12.9GPa.
The present invention has the following advantages relative to existing FRP stress relaxation tests device：
1st, FRP cloth stress relaxation test device simple structure of the invention, it is easy to assembly, it does not take up space.
2nd, apparatus of the present invention are convenient for the uniformly applied prestressing force of FRP cloth item to test specimen, it is only necessary to which a spanner can
The loading to FRP cloth item is completed, operability is strong.And the width x length of FRP cloth item is adjusted.Convenient for largely carrying out such examination
It tests, the data of accumulating and enriching, preferably understanding summarizes the stress relaxation ability of FRP cloth under prestress, promotes pre-stress FRP cloth
The utilization of structural strengthening technology.
Description of the drawings
Fig. 1 is the overall construction drawing of the test FRP cloth stress relaxation test device of the present invention.
Fig. 2 is the sectional structure chart of the test FRP cloth stress relaxation test device of the present invention.
Fig. 3 is the fixing end structure diagram of the test FRP cloth stress relaxation test device of the present invention.
Fig. 4 is the stretching end structure diagram of the test FRP cloth stress relaxation test device of the present invention.
Fig. 5 is the Self-locking type ground tackle structure chart that FRP cloth item is anchored in the embodiment of the present invention.
It is marked in figure：1- fixing ends；2- stretching ends；3- lapping plates；4- bottom plates；5- fixing end fixtures；6- ribbed stiffeners；7-
Pull end fixture；The vertical baffle of 8- stretching ends；The horizontal cushion blocks of 9-；10- anchor bolts；11- Self-locking type ground tackles；12-FRP cloth；13- tensioning anchors
Bar；14- anchorage bolts.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment：
As shown in Fig. 1~5, the present embodiment is prestressed CFRP stress relaxation test.It is specific as follows：
A kind of experimental rig for testing FRP cloth stress relaxation, including fixing end 1, stretching end 2 and lapping plate 3.Fixing end 1
It is made of bottom plate 4, fixing end fixture 5 and ribbed stiffener 6.Stretching end 2 is by bottom plate 4, stretching end fixture 7, vertical 8 and of baffle of stretching end
Horizontal cushion block 9 forms.Lapping plate 3 is connect integral by anchor bolt 10 with bottom plate 4.
Fixing end fixture 5 is welded by two pieces of horizontal steel plates and one block of vertical steel plate.Two anchor holes are opened at level board both ends,
Aperture and its spacing with fixed fiber cloth Self-locking type ground tackle 11 two anchor holes it is consistent.The vertical clear distance of two pieces of horizontal steel plates
By the thickness of Self-locking type ground tackle 11 along with four pieces of leveling plates thickness determine.The length of horizontal steel plate and vertical steel plate passes through
Respectively 20 millimeters of stretching determines the length of Self-locking type ground tackle 11 on both sides again.The width of horizontal steel plate adds for the width of Self-locking type ground tackle 11
The thickness of upper riser adds 10 millimeters.The height of vertical steel plate is 115 millimeters.Among upper horizontal steel plate and on vertical steel plate
Fang Kaiyi grooves form a trepanning and are passed through for FRP cloth 12.Vertical steel plate welds together with fixing end bottom plate 4.Ribbed stiffener 6
It is the isosceles right triangle steel plate that the two equilateral length of sides are 65 millimeters.Ribbed stiffener 6 sets 4, in 5 vertical steel plate of fixing end fixture
Trepanning both sides are per side two.6 liang of ribbed stiffener is equilateral to be welded with 5 vertical steel plate of fixing end fixture and fixing end bottom plate, plays reinforcement
The effect of 1 rigidity of fixing end.
Stretching end fixture 7 is welded into U-shaped steel plate by two pieces of horizontal steel plates and one block of vertical steel plate.It is net between horizontal steel plate
Anchor hole spacing away from, the length of horizontal and vertical steel plate and horizontal steel plate both ends is identical with fixing end fixture 5.Horizontal steel plate
Width adds 10 millimeters for the width of 5 horizontal steel plate of fixing end fixture plus the thickness of 13 end of stretching anchor rod.Stretching end presss from both sides
It opens the screw hole of a diameter of 20 millimeters and is passed through for stretching anchor rod 13 in the vertical steel plate center of tool 7.The vertical baffle 8 of stretching end is a height of
It 160 millimeters, is projected in the vertical steel plate trepanning of stretching end fixture 7 and an equal amount of anchor hole is opened at corresponding position for stretching anchor rod
13 pass through.The horizontal cushion block 9 of stretching end is located at 4 end both sides of tensioning end side bottom plate, is welded with bottom plate 4 and the vertical baffle 8 of stretching end.
Horizontal 1400 millimeters of the length of cushion block 9 is 20 millimeters wide, 25 millimeters high.Stretching end fixture 7 is placed thereon.
Bottom plate 4 is connect integral with lapping plate 3 by anchor bolt 10, and the length of lap segment is 800 millimeters.Pass through different length
The lapping plate 3 of metric lattice adjusts the length of stress relaxation test device, and 12 width of FRP cloth that Self-locking type ground tackle 11 is anchored can
It is adjusted in the range of 150 millimeters.Thus allow for different in width and length pre-stress FRP cloth stress relaxation test.
The steel plate uses the vertical steel plate of Q235B grades of high-quality steels, wherein fixing end fixture 5 and stretching end fixture 7
8 plate thickness of baffle vertical with stretching end is 30 millimeters, and the horizontal steel plate thickness of fixing end fixture 5 and stretching end fixture 7 is 15 millimeters,
Other steel plates are required to thickness >=20 millimeter.Stretching anchor rod 13 and anchorage bolt 14 use 12.9 grades of high strength anchor bar, resist
Shear stress grade is 12.9GPa.
When carrying out prestressed CFRP stress relaxation test, step is as follows：
1st, the experimental rig of assembling test FRP cloth stress relaxation.Method is：By the screw hole of 3 both sides of lapping plate and bottom plate 4
Screw hole is aligned, and is penetrated anchor bolt 10 and is tightened.
2nd, the cutting length of FRP cloth 12 and cutting are determined.
3rd, 12 one end of pre-stress FRP cloth is connected on Self-locking type ground tackle 11.Method is：Pre-stress FRP cloth 12 is put into certainly
In the two panels intermediate plate of locking-type anchorage 11 and intermediate plate is tightened, by FRP cloth 12 along 3 circle of anchor clipper circumferential direction winding, and ensures to wind
It is wrapped between FRP cloth 12 and anchor clipper in the process.
4th, the Self-locking type ground tackle 11 for having wrapped FRP cloth 12 is placed in fixing end fixture 5, and will be on Self-locking type ground tackle 11
Anchor hole be aligned with the anchor hole on 5 horizontal steel plate of fixing end fixture, and placing nut gasket in-between, by anchorage bolt 14
Screw rod penetrates wherein.Nut is sleeved on screw rod and screwed up with a wrench.
5th, 12 other end of FRP cloth is passed through in fixing end fixture 5 among upper horizontal steel plate and is formed above vertical steel plate
Trepanning.
The 6th, the screw rod of stretching anchor rod 13 is passed through to the anchor hole of stretching end fixture 7 and the vertical baffle 8 of stretching end.In stretching anchor rod
Pressure sensor is put on 13, then gasket and nut are sleeved on the screw rod of stretching anchor rod 13.
7th, 12 other end of FRP cloth is tightly wrapped in Self-locking type ground tackle 11.And by the anchor hole and stretching end on Self-locking type ground tackle 11
Anchor hole alignment on 7 horizontal steel plate of fixture, and placing nut gasket in-between, the screw rod of anchorage bolt 14 is penetrated wherein.
Nut is sleeved on screw rod and screwed up with a wrench.
8th, it pastes foil gauge at a certain distance in FRP cloth 12 and wiring is connect with strain acquirement instrument.It is twisted with spanner
Nut on tight anchorage bolt 14 records the reading of pressure sensor and foil gauge.Lasting loading is until what sensor recorded
Test force and strain value reach the power and strain value corresponding to default 12 degree of prestressing of FRP cloth, complete in advance should to FRP cloth 12
The application of power.
9th, after having applied prestressing force, the strain for keeping FRP cloth 12 is constant, that is, locks the deformation of FRP cloth 12, every a timing
Between interval by pressure sensor record test force value.Pre-stress FRP cloth can be obtained by the change in long term for analyzing test force
12 stress relaxation number size and its stress relaxation ability.
The FRP cloth 12 is CFRP cloth.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can carry out described specific embodiment some modifications or supplement or substitute in a similar way, but
It does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (1)
1. a kind of experimental rig for testing FRP cloth stress relaxation, it is characterised in that the device includes fixing end (1), stretching end (2)
With lapping plate (3)；Fixing end (1) is made of bottom plate (4), fixing end fixture (5) and ribbed stiffener (6)；Stretching end (2) is by bottom plate
(4), stretching end fixture (7), the vertical baffle of stretching end (8) and horizontal cushion block (9) composition；Lapping plate (3) by anchor bolt (10) with
Bottom plate (4) connection is integral；
Fixing end fixture (5) is welded by two pieces of horizontal steel plates and one block of vertical steel plate, and two anchor holes are opened at horizontal steel plate both ends,
Aperture and its spacing with fixed fiber cloth Self-locking type ground tackle (11) two anchor holes it is consistent, two pieces of horizontal steel plates it is vertical net
Away from the thickness by Self-locking type ground tackle (11) along with four pieces of leveling plates thickness determine, the length of horizontal steel plate and vertical steel plate
By the length of Self-locking type ground tackle (11), respectively 20 millimeters of stretching determines on both sides again；The width of horizontal steel plate is Self-locking type ground tackle (11)
Width plus riser thickness add 10 millimeters；The height of vertical steel plate is 110 ~ 120 millimeters；Among upper horizontal steel plate
A groove is opened with vertical steel plate top, a trepanning is formed and is passed through for FRP cloth (12)；Vertical steel plate is welded with fixing end bottom plate (4)
It is connected together；Ribbed stiffener (6) is the isosceles right triangle steel plate that the two equilateral length of sides are 60 ~ 70 millimeters；Ribbed stiffener (6) setting 4
It is a, in the vertical steel plate trepanning both sides of fixing end fixture (5) per side two；Ribbed stiffener (6) two is equilateral vertical with fixing end fixture (5)
Steel plate and the welding of fixing end bottom plate, play the role of strengthening fixing end (1) rigidity；
Stretching end fixture (7) is welded into U-shaped steel plate by two pieces of horizontal steel plates and one block of vertical steel plate；Clear distance between horizontal steel plate,
The horizontal and vertical length of steel plate and the anchor hole spacing at horizontal steel plate both ends are identical with fixing end fixture (5)；Horizontal steel plate
Width adds 10 millimeters for the width of fixing end fixture (5) horizontal steel plate plus the thickness of stretching anchor rod (13) end；Tensioning
It opens the screw hole of a diameter of 20 millimeters and is passed through for stretching anchor rod (13) in the vertical steel plate center of end fixture (7)；Stretching end is vertically kept off
A height of 160 millimeters of plate (8) projects in the vertical steel plate trepanning of stretching end fixture (7) and opens an equal amount of anchor at corresponding position
Hole is passed through for stretching anchor rod (13)；The horizontal cushion block of stretching end (9) is located at stretching end bottom plate (4) end both sides, same to bottom plate (4) and
The vertical baffle of pull end (8) welds；Horizontal cushion block (9) is 1400 millimeters long, 20 millimeters wide, 20 ~ 30 millimeters high, places stretching end thereon
Fixture (7)；
Bottom plate (4) is connect integral with lapping plate (3) by anchor bolt (10), and the length of lap segment is 800 millimeters, passes through difference
The lapping plate (3) of length specification adjusts the length of stress relaxation test device, the FRP cloth (12) that Self-locking type ground tackle (11) is anchored
Width can be adjusted in the range of 150 millimeters, thus allow for different in width and the examination of length pre-stress FRP cloth stress relaxation
It tests；
The steel plate is using Q235B grades and above high-quality steel, and wherein fixing end fixture (5) and stretching end fixture (7) is perpendicular
It is 30 millimeters to steel plate and the vertical baffle of stretching end (8) plate thickness, the horizontal steel plate of fixing end fixture (5) and stretching end fixture (7)
Thickness is 15 millimeters, other steel plates are required to thickness >=20 millimeter；Stretching anchor rod (13) and anchorage bolt (14) use 12.9
The high strength anchor bar of grade, anti-shearing stress levels are 12.9GPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610226567.XA CN105699190B (en) | 2016-04-13 | 2016-04-13 | A kind of experimental rig for testing FRP cloth stress relaxation |
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| CN201610226567.XA CN105699190B (en) | 2016-04-13 | 2016-04-13 | A kind of experimental rig for testing FRP cloth stress relaxation |
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| CN105699190A CN105699190A (en) | 2016-06-22 |
| CN105699190B true CN105699190B (en) | 2018-07-03 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716949B (en) * | 2016-04-13 | 2018-07-03 | 桂林理工大学 | A kind of test method for testing FRP cloth stress relaxation |
| CN109030212A (en) * | 2018-08-02 | 2018-12-18 | 西安建筑科技大学 | A kind of air-supported membrane structure corner Deformation Observation experimental rig |
| CN112326436A (en) * | 2020-10-29 | 2021-02-05 | 合肥工业大学 | Device and method for testing mechanical properties of inner curtain cloth assembly of airship |
| CN113295527B (en) * | 2021-05-24 | 2022-12-09 | 燕山大学 | Device for measuring stress relaxation of fiber reinforced composite bar and measuring method thereof |
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