CN109799265A - A method of damages of concrete structures is measured using carbon cloth - Google Patents
A method of damages of concrete structures is measured using carbon cloth Download PDFInfo
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- CN109799265A CN109799265A CN201910147579.7A CN201910147579A CN109799265A CN 109799265 A CN109799265 A CN 109799265A CN 201910147579 A CN201910147579 A CN 201910147579A CN 109799265 A CN109799265 A CN 109799265A
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- carbon fiber
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Abstract
The invention discloses a kind of methods for measuring concrete damage position and degree using carbon cloth, utilize the electric conductivity and piezoresistive effect of carbon fiber, carbon fiber synnema two end electrodes to surface with insulating coating apply certain voltage, after being connect with computer, situation of change of the detonation front and rear surfaces with electric current in the carbon fiber synnema of insulating coating is obtained, database is established.The purpose of the present invention is by measurement concrete component upper surface with the electric current on the carbon fiber synnema of insulating coating by the variation before and after the percussions such as explode, collide, damage envelope and degree are injured in intelligent decision percussion position, realize the intelligent evaluation to concrete structure health status.
Description
Technical field
The present invention relates to damages of concrete structures the field of test technology, and in particular to it is a kind of measured using carbon cloth it is mixed
The method of Xtah Crude Clay structure damage.
Background technique
Concrete is widely used as a kind of excellent traditional building material in modern project, and severe for being in
Be easy to appear if reinforced concrete structure (such as coastal building, bridge structure etc.) in environment the aging of concrete material itself with
It destroys, the attack of terrorism and accidental explosion event are even more to cause huge damage to concrete structure, therefore occur both at home and abroad various
Engineering major accident causes huge safety problem and economic loss.It is eager to need to develop that identification concrete is monitored
The technology of structural damage and safe coefficient.
In recent years, scholars mainly utilize modernization industry automation control, the communication technology, computer networking technology etc.,
The dimensional deformation of concrete structure is monitored and is assessed.In the application of practical building, since working environment, structure are special
The particularity of point etc., many technical problems such as optical fiber calibration are to be resolved and improve.In addition, concrete structure is being rushed
There are internal injuries when hitting, and can not show external obvious deformation, and existing technologies comment the non-destructive tests and safety of inside configuration
There are still very big difficulties for valence.
Carbon fiber with its high-strength light, high-elastic mould, it is corrosion-resistant the advantages that, be widely used in structural strengthening.Separately
On the one hand, carbon fiber is also conductive and piezoresistive effect, while piezoresistive effect makes carbon fiber as structural material, it may have
Potentially from sensing function, early warning can be carried out to the working condition of structure, existing scholar is studied in this respect.
China Patent Publication No. 108612338A describes the civil structure of a kind of piezoelectric material and the compound cloth of carbon fiber
It reinforces and monitoring device and method, the patent carries out the detection of stress wave using carbon fiber fabric to structure, to pacify to structure
It is assessed entirely.
China Patent Publication No. CN104297458A provides a kind of carbon fiber reinforced concrete damage-resistivity incidence relation survey
Amount method can measure damage-resistivity incidence relation that static load acts on lower carbon fiber reinforced concrete material, measurement result ratio
It is relatively accurate.Shortcoming is due to underwater blast wave be it is continuous and non-static, which needs to examine using nonmetal ultrasonic
Instrument is surveyed, misalignment can be measured because of the flowing of water flow variation in the use environment for building of paddling.
Summary of the invention
It is insufficient according to prior art, concrete structure is measured using carbon cloth the object of the present invention is to provide a kind of
The method of damage applies certain voltage to carbon fiber synnema two end electrodes, with meter using the electric conductivity and piezoresistive effect of carbon fiber
After the connection of calculation machine, the situation of change of electric current in the carbon fiber synnema of detonation front and back is obtained, database is established.By measuring concrete structure
Electric current on part on carbon fiber synnema is by the variation before and after the percussions such as explode, collide, intelligent decision percussion position
It sets, injure damage envelope and degree, realize the intelligent evaluation to concrete structure health status.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A method of damages of concrete structures is measured using carbon cloth, comprising the following steps:
Step 1: according to the surface shape of concrete structure weave cut respective shapes carbon cloth, carbon cloth by
Two groups of carbon
Filament tow weaves, and includes a plurality of common carbon fibers beam arranged in parallel in every group of carbon fiber synnema
Silk, two groups of carbon fiber synnemas vertical (direction x, y) are cross-woven, the common carbon fibers synnema in the direction x and the master of concrete structure
Want Impact direction consistent；
Step 2: the carbon fiber synnema of insulating coating, table are had every a plurality of surface of setting among every group of carbon fiber synnema
Carbon fiber synnema of the face with insulating coating is parallel with remaining common carbon fibers synnema in group, and surface has the carbon fiber of insulating coating
Carbon cloth is stretched out at the both ends for tieing up synnema, and makes carbon fiber synnema of the surface with insulating coating at carbon cloth crossover node
It insulate with remaining common carbon fibers synnema；
Step 3: in the fixed electrode in the both ends of carbon fiber synnema of the surface with insulating coating；
Step 4: the two end electrodes of the carbon fiber synnema by surface with insulating coating are connect with computer, and at two
Apply voltage U between electrode, measures two interelectrode electric current I；
Step 5: the curent change of the carbon fiber synnema according to detonation front and rear surfaces with insulating coating obtains concrete knot
The damage location and range of structure.
Further, the surface is neoprene with the insulating coating in the carbon fiber synnema of insulating coating.
Further, the electrode is fixed with the surface with the carbon fiber synnema of insulating coating by fixture.
Compared with prior art, the present invention has the following advantages and beneficial effects:
1. a kind of method for measuring damages of concrete structures using carbon cloth of the present invention, without in special
The damnification recognition method and interference signal processing method of door, using the electric conductivity and piezoresistive effect of carbon fiber, to surface with exhausted
The carbon fiber synnema two end electrodes of edge coating apply certain voltage, after connecting with computer, obtain detonation front and rear surfaces with exhausted
The situation of change of electric current, establishes database in the carbon fiber synnema of edge coating.Pass through carbon fiber synnema on measurement concrete component
On electric current by the variation before and after the percussions such as explode, collide, damage envelope is injured in intelligent decision percussion position
And degree, it realizes the intelligent evaluation to concrete structure health status, implements economical convenient, livehood economy, national defence are pacified
Congruent meaning is huge.
2. a kind of method for measuring damages of concrete structures using carbon cloth of the present invention, carbon cloth is one
Kind flexible material, applied widely, various shapes can more embody the advantage of carbon fiber on some special irregular structures, this
The molding of kind material is also very convenient, can be applicable in any position of various structures, various components, and does not influence the outer of structure
It sees.
3. a kind of method for being measured damages of concrete structures using carbon cloth of the present invention is being realized to coagulation
It is smaller and excellent using the good mechanical property of carbon fiber, thermal capacity while the determination of soil structure damage position and degree of injury
Elegant corrosion resistance and radiativity, reinforces concrete structure, effectively improves the bearing capacity of component, corrosion resistance, durable
Property, and the self weight of structure does not have too many burden, the long-term safety of effective protection concrete structure.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is to survey damages of concrete structures position schematic diagram using carbon fiber.
Wherein: 1, carbon cloth；2, surface has the carbon fiber synnema of insulating coating；3, common carbon fibers synnema；4, it leads
Line；5, computer；6, concrete structure；7, electrode.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
The present invention is a kind of method for measuring concrete damage position and degree of injury using carbon cloth.This method utilizes
The electric conductivity of carbon fiber has 2 shape of carbon fiber synnema of insulating coating by the surface in two vertical direction of carbon cloth 1
At carbon fiber network implementations concrete damage position positioning, while using the excellent mechanical property of carbon fiber to concrete knot
Structure plays the role of protective reinforcing, improves fracture toughness, ductility and durability.
As depicted in figs. 1 and 2, a method of measuring damages of concrete structures, including following step using carbon cloth
It is rapid:
Step 1: weaving the carbon cloth for cutting respective shapes, carbon cloth 1 according to the surface shape of concrete structure 6
It is woven by two groups of carbon fiber synnemas, includes a plurality of common carbon fibers synnema arranged in parallel in every group of carbon fiber synnema
3, two groups of carbon fiber synnemas vertical (direction x, y) are cross-woven, the common carbon fibers synnema 3 in the direction x and the master of concrete structure 6
Want Impact direction consistent；
Step 2: the carbon fiber synnema 2 of insulating coating, table are had every a plurality of surface of setting among every group of carbon fiber synnema
Carbon fiber synnema 2 of the face with insulating coating is parallel with remaining common carbon fibers synnema 3 in group, and surface has the carbon of insulating coating
Carbon cloth 1 is stretched out at the both ends of filament tow 2, and intersects carbon fiber synnema 2 of the surface with insulating coating in carbon cloth 1
It insulate at node with remaining common carbon fibers synnema 3；
Step 3: in the fixed electrode in the both ends of carbon fiber synnema 2 of the surface with insulating coating；
Step 4: the two end electrodes 7 of the carbon fiber synnema 2 by surface with insulating coating are connect with computer 5, and two
Apply voltage U between a electrode, measures two interelectrode electric current I；
Step 5: obtaining coagulation with the curent change in the carbon fiber synnema 2 of insulating coating according to detonation front and rear surfaces
The damage location and range of soil structure 6.
In the present invention, surface can be come out with the carbon fiber synnema 2 of insulating coating with certain color identifier, so as to later
Particular carbon filament tow can be found in time when measuring electric current.Surface is with the insulating coating in the carbon fiber synnema 2 of insulating coating
For neoprene.Carbon fiber synnema 2 of the electrode 7 by fixture and surface with insulating coating is fixed.Fixture can be crocodile clip or U
Type fork.
Carbon fiber synnema 2 interval of a plurality of surface with insulating coating is determined according to error.In the embodiment of the present invention, according to
The surface shape braiding of concrete structure 6 cuts the carbon cloth 1 of respective shapes and is woven into common carbon fibers synnema 3 and table simultaneously
Face has the carbon fiber synnema 2 of insulating coating, is woven into a surface at interval of 5cm in every group of carbon fiber synnema and has insulating coating
Carbon fiber synnema 2, carbon cloth 1 is arranged in its surface according to the specific shape of concrete structure 6, and a plurality of surface is with insulation
The ipsilateral extension end of carbon fiber synnema 2 of coating is connected with conducting wire 5, to have 2 shape of carbon fiber synnema of insulating coating to surface
At network real-time monitoring.
The working principle of the invention: when concrete structure 6 is damaged, can carbon cloth 1 to surface layer generate power
Effect causes the damage that synnema is different degrees of, or fracture or deformation, due to the electric conductivity and piezoresistive effect of carbon fiber, carbon fiber
The damage deformation of synnema will lead to resistance and generate variation, thus in the damage reflection to curent change of concrete structure 6.In table
Face applies voltage in the two end electrodes 7 with the carbon fiber synnema 2 of insulating coating, the size of current of detonation front and back is obtained, if nothing
Electric current, which generates, shows that carbon fiber synnema 2 of this surface with insulating coating is broken completely, therefore in the column carbon cloth institute
Locate damaging and in the core position that explosion damages, if it exists electric current but electric current relatively detonation there are concrete structure 6 on position
Before be obviously reduced show this surface with insulating coating carbon fiber synnema 2 on part carbon fiber fracture or deformation, therefore
There are the damage of concrete structure 6 and in the margin location of damages of concrete structures range on the column carbon cloth present position
It sets；Same method obtains the curent change of carbon fiber synnema 2 of the vertical direction upper surface with insulating coating, measures the direction
The damage position and range of upper concrete are intersected the damage that can substantially obtain concrete structure by the damage range of x, y both direction
Traumatic part position and range.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (3)
1. a kind of method for measuring damages of concrete structures using carbon cloth, which comprises the following steps:
Step 1: weaving the carbon cloth for cutting respective shapes according to the surface shape of concrete structure, carbon cloth is by two groups
Carbon fiber synnema weaves, in every group of carbon fiber synnema include a plurality of common carbon fibers synnema arranged in parallel, two groups
Carbon fiber synnema vertical (direction x, y) is cross-woven, the common carbon fibers synnema in the direction x and the main stress side of concrete structure
To consistent；
Step 2: the carbon fiber synnema of insulating coating, surface band are had every a plurality of surface of setting among every group of carbon fiber synnema
Have that the carbon fiber synnema of insulating coating is parallel with remaining common carbon fibers synnema in group, surface has the carbon fiber bundle of insulating coating
Silk both ends stretch out carbon cloth, and make surface with insulating coating carbon fiber synnema at carbon cloth crossover node and its
Remaining common carbon fibers synnema insulation；
Step 3: in the fixed electrode in the both ends of carbon fiber synnema of the surface with insulating coating；
Step 4: the two end electrodes of the carbon fiber synnema by surface with insulating coating are connect with computer, and in two electrodes
Between apply voltage U, measure two interelectrode electric current I；
Step 5: the curent change of the carbon fiber synnema according to detonation front and rear surfaces with insulating coating obtains concrete structure
Damage location and range.
2. the method according to claim 1 for measuring damages of concrete structures using carbon cloth, it is characterised in that: institute
It is neoprene that surface, which is stated, with the insulating coating in the carbon fiber synnema of insulating coating.
3. the method according to claim 1 for measuring damages of concrete structures using carbon cloth, it is characterised in that: institute
It states electrode and is fixed with the surface with the carbon fiber synnema of insulating coating by fixture.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910147579.7A CN109799265B (en) | 2019-02-27 | 2019-02-27 | Method for measuring damaged part and degree of concrete by using carbon fiber cloth |
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| CN109799265B CN109799265B (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799266A (en) * | 2019-02-28 | 2019-05-24 | 武汉大学 | A method of damages of concrete structures is measured using carbon cloth |
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| CN101551350A (en) * | 2009-05-18 | 2009-10-07 | 南昌航空大学 | Method of establishing damnification self-diagnosis system for carbon fiber enhancement resin base composite material |
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