CN108917584A - Composite structure column system is actively adjusted from perception based on marmem - Google Patents
Composite structure column system is actively adjusted from perception based on marmem Download PDFInfo
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- CN108917584A CN108917584A CN201810748762.8A CN201810748762A CN108917584A CN 108917584 A CN108917584 A CN 108917584A CN 201810748762 A CN201810748762 A CN 201810748762A CN 108917584 A CN108917584 A CN 108917584A
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- composite structure
- structure column
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention belongs to civil engineering composite structures to reinforce and health monitoring technique field, be related to it is a kind of composite structure column system is actively adjusted from perception based on marmem, mainly monitored system and Measurement and Control System by composite structure column, shape-memory alloy wire, shaft enhancement layer, comprehensive health and formed.Shape-memory alloy wire is spirally wound on the outside of structural column by the present invention, under load action, composite structure column and shape-memory alloy wire cooperative transformation, by the hoop strain of shape-memory alloy wire length and resistance variations reflection composite structure column.The sensor for being arranged in shaft obtains more fully damage information, carries out heating control to shape-memory alloy wire according to composite structure column degree of impairment, brings it about recovery deformation, applies active constraint power to coupled column.The present invention program is simple, feasibility is strong, convenient for safeguarding and good compatibility, realizes health monitoring and actively adjustable reinforcing in composite structure column life cycle management.
Description
Technical field
The invention belongs to the reinforcings of civil engineering composite structure and health monitoring technique field, are related to a kind of based on shape memory
Composite structure column system is actively adjusted from perception in alloy.
Background technique
With the development of Chinese society and the raising of technical level, composite structure is in all kinds of novel buildings and special building knot
It is used widely in structure, such as super high rise structure, heavy duty industrial building, large bridge and large-span space structure.Combination knot
Structure column is the key that composite structure supporting member, once it destroys, it will catastrophic effect is caused, sufficiently to ensure structure
Safety, comfort and durability, to composite structure column carry out safety monitoring and take relevant reinforcement, maintenance measures to close weight
It wants.
Marmem (Shape Memory Alloy, abbreviation SMA) is a kind of with shape memory effect (Shape
Memory Effect, abbreviation SME), the new function material of phase transformation super-elasticity (Superelasticity, abbreviation SE) and high-damping
Material, is all widely used in aerospace industry, mechano-electronic product, biologic medical, building structure and daily life.
SMA can sense temperature, magnetic field etc. change and convert thermal energy into mechanical energy, external power output, displacement or storage simultaneously release energy.
SMA also has that recoverable deformation is big, limited restoring force is big, resistance strain sensitive, corrosion-resistant, anti-fatigue performance is good, can be processed
Performance is good, is easy to the features such as materials such as same concrete, steel combine, elasticity modulus changes with the change of transition, is soil
Preferred one of driving element in wood engineering.Its driving of magnetic SMA (MSMA) is by magnetic field transmission rather than leans on relatively slow biography
Heat engine reason, can be used for making high frequency (up to 1kHz) driver, and strain rate can match in excellence or beauty with magnetostriction and piezoelectric element, strain
Close with SMA, MSMA can provide specific power identical with SMA, but transmission frequency is higher.
Existing composite structure column mostly uses the reinforcing of passive bound, reinforcement form, i.e., inside and outside in Reinforced Concrete Core column
The materials such as steel skeleton or package steel pipe, FRP are placed, or second pouring is carried out to concrete.Although passive bound can to structure into
Row is strengthened, is reinforced, but there are certain blindness, cannot in real time, accurately grasp the working condition of structure, be easy to appear and strengthened
The situation of degree or deficiency.Research at present about the reinforcing of composite structure column active constraint is less, be difficult to control there are constraint degree etc.
Difficult point in existing research, there is no the report that health monitoring Yu ruggedized construction system are actively adjusted about composite structure column.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, make full use of temperature and the resistive performance of marmem SMA special
Point, and new structure health monitoring technique is introduced, structural damage situation is fully assessed, heating control is carried out to marmem
System, the present invention provides a kind of to be actively adjusted composite structure column system from perception based on marmem.Of the invention
Technical solution is simple, feasibility is strong, convenient for safeguarding and good compatibility, can develop diversified embodiment party on this basis
Case.Realization carries out health monitoring to composite structure in life cycle management and reinforcing is actively adjusted, strengthens.
Technical solution of the present invention：
It is a kind of that composite structure column system is actively adjusted from perception based on marmem, mainly by composite structure column
RC, shape-memory alloy wire SMA, shaft enhancement layer J, comprehensive health monitoring system and Measurement and Control System MC composition；
The composite structure column RC is fixed on basic G；The outer wall on the top composite structure column RC is equipped with shaft enhancement layer
J, for providing restraining force under high-intensitive load action for shaft, the dimensional parameters of shaft enhancement layer J are determined by actual conditions；
The shape-memory alloy wire SMA is spirally wound on the outer wall of the lower part composite structure column RC, is played sensing and is made
With, and active constraint power is provided for composite structure column RC；Needed for shape-memory alloy wire SMA is connected to by alloy Threaded Connector Coupling SC
Length；
The Measurement and Control System MC is connect by conducting wire W with the both ends of shape-memory alloy wire SMA, real-time monitoring
Shape-memory alloy wire SMA resistance and length variation, obtain composite structure column RC damage information, comment its safe condition
Estimate；Measurement and Control System MC carries out heating control to shape-memory alloy wire SMA according to degree of impairment, brings it about recovery and becomes
Shape applies active constraint power to composite structure column RC；
The comprehensive health monitors system, including strain transducer SS, displacement sensor DS, acceleration transducer AS and
Data acquisition system；The strain transducer SS has multiple, and the inside of composite structure column RC is arranged in using flush type,
Or it is fixed on by the way of surface mount between the winding on the outer wall of composite structure column RC and positioned at shape-memory alloy wire SMA
In gap；The displacement sensor DS has multiple, is arranged on the outer wall of composite structure column RC；The acceleration transducer AS
Have multiple, is arranged on the outer wall on the top composite structure column RC；Displacement sensor DS and acceleration transducer AS are arranged in combination
Structural column RC external wall of upper portion；The data acquisition system is passed with strain transducer SS, displacement sensor DS and acceleration
Sensor AS is connected, and for acquiring structural damage information, and carries out assessment of impairments, by assessment of impairments result feedback to measurement control system
In system MC.
The shape-memory alloy wire SMA, be the compound memorial alloy of Ti-Ni base, also can be selected it is satisfactory other
Marmem.
Shape-memory alloy wire SMA has lower martensite start temperature Ms and higher austenite start temperature As,
To guarantee that alloy wire shape under room temperature service state does not vary with temperature；The course of work of shape-memory alloy wire SMA is：Examination
Sample is after through initial treatment, deformation occurs, and when being heated with heat source to it, deformation is gradually recovered, and applies to composite structure column RC
Addition of constraints power, after removing heat source, shape-memory alloy wire SMA maintains shape invariance after heating.
Shape-memory alloy wire SMA should be wrapped in protective layer, shape memory alloy wires be formed, to facilitate in coupled column
It is externally wrapped with, and to its protective effect of alloy wire.Shape-memory alloy wire SMA should also have big recovery strain, greatly export stress,
The overall characteristics such as resistance variations are obvious, accurately control, the good, signal shielding of durability.The diameter of shape-memory alloy wire SMA,
Length and winding circle number, distance s etc. can be determined specifically according to the actual situation.
Shape-memory alloy wire SMA on composite structure column RC after the completion of winding, using glue to shape-memory alloy wire
The position SMA is further fixed, and is prevented in long-term use process, and the position shape-memory alloy wire SMA changes.In addition,
The junction alloy Threaded Connector Coupling SC and shape-memory alloy wire SMA and conducting wire W is also fixed using glue, is protected.
Alloy Threaded Connector Coupling SC is that can guarantee all kinds of connection types that memory alloy wire effectively connects, such as sleeve connection, folder
Have the modes such as connection, welding, overlap joint, alloy wire should be avoided to connect as far as possible in actual use, select longer shape memory as far as possible
Alloy wire SMA.
Composite structure column RC refers to all kinds of structural columns in building structure, can be traditional plain concrete column, reinforced concrete
Earth pillar and steel structure column, or the emerging combination such as steel, FRP constraint column constrains column, and cross sectional shape can be round, side
Shape, ellipse etc..
Conducting wire W can be ordinary copper matter conducting wire, or other types conducting wire, should have durability it is good, convenient for be laid with
With the overall characteristics such as protection, long transmission distance and signal shielding.
Shaft enhancement layer J is the constraint materials such as FRP, steel pipe, and specific facilities press actual demand.
Strain transducer SS includes two kinds of forms of flush type and surface mount, and strain ga(u)ge, fiber optic strain gage etc. are all kinds of
Strain transducer can be selected；Displacement meter, amesdial, LVDT etc. can be selected according to accuracy requirement difference in displacement sensor DS；Add
Velocity sensor AS is selected also according to actual demand.Various kinds of sensors arranges that quantity is arranged by actual conditions.
Measurement and Control System MC is connected by conducting wire W with shape-memory alloy wire SMA, real-time measurement shape-memory alloy wire
The resistance variations situation of SMA obtains composite structure column RC strain information, and according to composite structure column RC strained situation, in due course right
Shape-memory alloy wire SMA is heated, and provides hoop constraint power for composite structure column RC.Further optimization, can be by number
It is synthesized to together according to acquisition system DAS and Measurement and Control System MC, convenient for data transmission and information management.
The working principle of the invention is：Shape-memory alloy wire SMA, combination are wound in the outer helical of composite structure column RC
Structural column RC and shape-memory alloy wire SMA form an entirety, cooperative transformation, shape-memory alloy wire SMA by conducting wire W with
Measurement and Control System MC is connected, meanwhile, strain transducer SS, displacement sensor DS, acceleration transducer AS and data acquire
System DAS is connected, and acquires structural damage information comprehensively, and carry out Injury degree.Under external load effect, composite structure column
RC be wrapped in outside shape-memory alloy wire SMA synchronize deform, in deformation process marmem SMA length send out
Raw to change, i.e., marmem SMA resistance can change, and Measurement and Control System MC records shape-memory alloy wire SMA's
Resistance variations, and the resistance variations of shape-memory alloy wire SMA are converted to the hoop strain of composite structure column RC.
Strain transducer SS, displacement sensor DS, acceleration transducer AS and data acquisition system collectively form synthesis
Health monitoring systems, the every damage information (strain, sidesway, acceleration etc.) and shape that comprehensive health monitoring system obtains
The obtained strain information of memory alloy wire SMA makes evaluation to the degree of injury of composite structure column RC.When structure reaches certain
After degree of injury, triggering Measurement and Control System MC carries out heating control to shape-memory alloy wire SMA, brings it about recovery and becomes
Shape applies hoop constraint to composite structure column RC, offsets or reduce the hoop strain that combination structural column RC occurs under load action.
Comprehensive health monitoring system passes through the damage information of real-time monitoring composite structure column RC and makes evaluation, for difference
Level of damage, heating control in various degree is carried out to shape-memory alloy wire SMA, i.e., different journeys are applied to composite structure column RC
The restraint stress of degree, realization real-time, dynamic monitoring and actively adjustable reinforcing, reinforcing to composite structure column RC.Structure is damaged
Hurt more serious situation, other reinforcings can also be taken to arrange while applying hoop constraint by shape-memory alloy wire SMA
It applies.It is every to carry out primary actively heating constraint in the present invention, structural strain information need to be reset, and heated again about
The heating temperature of beam must be over before control temperature.
Beneficial effects of the present invention：
Compared with prior art, the present invention makes full use of the performance advantage of New Shape Memory Alloys material, fusion structure
Health monitoring technique, devise it is a kind of based on marmem from perception composite structure column system is actively adjusted.This hair
The bright scattered property for changing traditional component detection and reinforcing, significantly reduces the complexity that component is detected with reinforced, reduces people
Work demand realizes the integrated, intelligent of composite structure health monitoring systems, standardization.For building structure fitness assessment with
It reinforces and effective ways is provided, be applicable not only to great civil structure health monitoring and damage is reinforced, be also applied for typical civil knot
The health monitoring and damage of structure are reinforced, and have tremendous economic and social benefit.
In the present invention, marmem resistivity is also made full use of to change apparent advantage with length, for measuring group
Structural column hoop strain is closed, and corresponding constraint is applied according to this hoop strain value.Compared to traditional strain ga(u)ge, same
Under deformation condition, memorial alloy has biggish resistance variations, and measurement sensitivity greatly improves.In the present invention, marmem
Silk needs be only arranged on the outside of structural column, easy to repair and replacement, and combination column system economic cooperation reason maintenance, which can have, longer uses the longevity
Life.
Detailed description of the invention
Fig. 1 is the schematic diagram of the embodiment of the present invention one；
Fig. 2 is the schematic diagram of the embodiment of the present invention two.
In figure：RC composite structure column；The basis G；SMA shape-memory alloy wire；SC alloy Threaded Connector Coupling；W conducting wire；J shaft adds
Strong layer；SS strain transducer；DS displacement sensor；AS acceleration transducer；DAS data collection system；MC Measurement and Control System.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
Embodiment one
Knot is combined from perception is actively adjustable based on marmem as shown in Figure 1, present embodiment discloses a kind of
Structure column system, the faulted condition of real-time perception composite structure column, and controllable active is applied about to structural column according to degree of impairment
Beam force.The system includes：Composite structure column RC, spiral winding and the shape-memory alloy wire SMA being fixed on the outside of shaft, it is several
A alloy Threaded Connector Coupling SC, shaft enhancement layer J, several strain transducer SS, displacement sensor DS, acceleration transducer AS, data
Acquisition system DAS is connect with sensor, and Measurement and Control System MC passes through the both ends with shape-memory alloy wire SMA respectively conducting wire W
It is connected.
Marmem SMA is wound in composite structure column RC outer helical, fixes shape-memory alloy wire SMA with glue
Position, structural column and shape-memory alloy wire SMA form an entirety, and shape shape-memory alloy wire SMA passes through conducting wire W and measurement
Control system MC is connected.Under external load effect, composite structure column RC can deform and vibrate, and such as be compressed axially, circumferential swollen
Swollen, lateral displacement etc., the sensor for being arranged in the composite structure surface column RC or inside can effectively capture deformation and vibration information,
And it is transferred to data acquisition system, thus comprehensive assessment can be carried out to composite structure column RC faulted condition.
Composite structure column RC reaches triggering measurement control after certain degree of injury (such as hoop strain value is more than certain threshold value)
System MC heats shape-memory alloy wire SMA by conducting wire W, brings it about recovery deformation, applies to composite structure column RC
Add hoop constraint, offsets or reduce the strain that combination structural column RC occurs under load action.For different level of damage, measurement
Control system MC can carry out heating control in various degree to shape-memory alloy wire SMA, i.e., apply to composite structure column RC different
The restraint stress of degree realizes the real-time, dynamic monitoring to composite structure column RC and reinforcing strengthening is actively adjusted.
Comprehensive health monitoring system and Measurement and Control System MC is arranged in the present embodiment simultaneously in composite structure cylinder system, if
Set independent comprehensive health monitoring system be in order to obtain more comprehensive structural damage information, convenient for composite structure column RC into
Row active constraint takes other reinforcement measures while reinforcing.The cost is relatively high for the embodiment, is more suitable for safety requirements
High heavy construction structure or great infrastructure building, such as large bridge, duct, large span spatial structure, super high-rise building.
Embodiment two
As shown in Fig. 2, the present embodiment can be considered the reduction procedure of case study on implementation one, no longer it is separately provided in the present embodiment comprehensive
Health monitoring systems are closed, the hoop strain of the resistance characteristic measurement structure column RC of shape-memory alloy wire SMA, and root are directly utilized
Alloy wire temperature is controlled according to the hoop strain value measured, applies suitable hoop constraint.In specific implementation process, shape memory is closed
Golden SMA is spirally wound on the outside of composite structure column RC, fixes alloy wire position with glue, composite structure column RC and shape memory close
Golden SMA forms an entirety, cooperative transformation, and marmem SMA is connected by conducting wire W with Measurement and Control System MC.Outside
Under load action, composite structure column RC be wrapped in outside marmem SMA synchronize deform, composite structure column RC
Deformation causes marmem SMA length to change, i.e., marmem SMA resistance can change, measurement control
System records the variation of marmem SMA resistance, and the variation of marmem SMA resistance is converted to composite structure column RC
Strain.Measurement and Control System MC assesses obtained composite structure column RC strain information, when strain value is more than certain threshold value
Afterwards, the heating control system in Measurement and Control System MC is triggered, marmem SMA is heated by conducting wire W, makes it
Occur to restore deformation, hoop constraint is applied to composite structure column RC, offsets or reduce combination structural column RC under load action and occur
Strain.Measurement and Control System closes shape memory for different strain levels by real-time monitoring structural column strain variation
Golden SMA carries out heating control in various degree, i.e., applies different degrees of restraint stress to composite structure column RC, realizes and ties to combination
Structure column RC in real time, dynamic monitoring and reinforcing strengthening is actively adjusted.
Embodiment two eliminates the comprehensive health monitoring system of case study on implementation one, is only answered according to the circumferential direction of composite structure column RC
Become information to reinforce composite structure column RC, strengthen, effectively reduce cost, it is relatively not high to can be used for safety requirements, fits
For all kinds of civil engineering structures such as building construction, bridge, tunnel.
Claims (3)
1. it is a kind of based on marmem from perception composite structure column system is actively adjusted, which is characterized in that mainly by
Composite structure column (RC), shape-memory alloy wire (SMA), shaft enhancement layer (J), comprehensive health monitoring system and measurement control system
System (MC) composition；
The composite structure column (RC) is fixed on basic (G)；The outer wall on the top composite structure column (RC) is reinforced equipped with shaft
Layer (J), for providing restraining force under high-intensitive load action for shaft, the dimensional parameters of shaft enhancement layer (J) are by actual conditions
It determines；
The shape-memory alloy wire (SMA), is spirally wound on the outer wall of the lower part composite structure column (RC), plays sensing and makees
With, and active constraint power is provided for composite structure column (RC)；Shape-memory alloy wire (SMA) is connected by alloy Threaded Connector Coupling (SC)
To required length；
The Measurement and Control System (MC) is connect by conducting wire (W) with the both ends of shape-memory alloy wire (SMA), is supervised in real time
Shape-memory alloy wire (SMA) resistance and length variation are surveyed, the damage information of composite structure column (RC) is obtained, to its safe condition
It is assessed；Measurement and Control System (MC) carries out heating control to shape-memory alloy wire (SMA) according to degree of impairment, makes its hair
It is raw to restore deformation, active constraint power is applied to composite structure column (RC)；
The comprehensive health monitors system, including strain transducer (SS), displacement sensor (DS), acceleration transducer (AS)
With data collection system (DAS)；The strain transducer (SS) has multiple, is arranged in composite structure column (RC) using flush type
Inside, or be fixed on by the way of surface mount on the outer wall of composite structure column (RC) and be located at shape-memory alloy wire
(SMA) in Clearance Between Wound；The displacement sensor (DS) has multiple, is arranged on the outer wall of composite structure column (RC)；Institute
The acceleration transducer (AS) stated has multiple, is arranged on the outer wall on the top composite structure column (RC)；Displacement sensor (DS) and
Acceleration transducer (AS) is arranged in composite structure column RC external wall of upper portion；The data collection system (DAS), with strain sensing
Device (SS), displacement sensor (DS) are connected with acceleration transducer (AS), for acquiring structural damage information, and carry out damage and comment
It is fixed, by assessment of impairments result feedback in Measurement and Control System (MC).
2. composite structure column system is actively adjusted in a kind of perception certainly based on marmem according to claim 1
System, which is characterized in that the shape-memory alloy wire (SMA) is the compound memorial alloy of Ti-Ni base.
3. composite structure column system is actively adjusted in a kind of perception certainly based on marmem according to claim 1
System, which is characterized in that guarantee that shape-memory alloy wire effectively connects, reduce loss, connector (SC) selects sleeve connection, fixture
Connection, welding or overlapped mode select long shape-memory alloy wire (SMA) to avoid alloy wire from connecting.
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Cited By (2)
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| CN110701014A (en) * | 2019-10-28 | 2020-01-17 | 吉林大学 | Hierarchical progressive rotation driving device based on shape memory alloy and control method thereof |
| CN113406148A (en) * | 2021-05-24 | 2021-09-17 | 上海交通大学 | Device based on shape memory alloy |
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