CN112179264A - Long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method - Google Patents
Long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method Download PDFInfo
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- CN112179264A CN112179264A CN202011000042.7A CN202011000042A CN112179264A CN 112179264 A CN112179264 A CN 112179264A CN 202011000042 A CN202011000042 A CN 202011000042A CN 112179264 A CN112179264 A CN 112179264A
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
Abstract
The invention discloses a method for monitoring the reinforcing effect of a prestressed carbon fiber plate bridge based on long gauge length strain, which comprises the following steps of: arranging a plurality of long gauge length strain sensors on a prestressed carbon fiber plate reinforcing section of a monitored bridge; collecting long gauge length strain original data and a long gauge length strain time-course curve; acquiring the long gauge length strain time range area caused by the passing of a single vehicle at different time stages; solving the size of the area surrounded by the long gauge length strain time-course curves of all the long gauge length sensors, and drawing a distribution diagram along the longitudinal direction of the bridge; the reliability of the identification result is improved by analyzing the sample data for many times, and the prestress loss is evaluated by monitoring for a long time. The method can quickly evaluate the prestress loss of the prestressed CFRP plate reinforced bridge under the condition of not influencing the bridge reinforcing construction and the later-stage operation traffic, obtain the distribution condition of the prestress loss of the bridge, and provide a reliable basis for the management and maintenance of the bridge.
Description
Technical Field
The invention relates to the technical field of bridge structures and sensing monitoring, in particular to a method for monitoring the reinforcing effect of a prestressed carbon fiber plate bridge based on long gauge length strain. .
Background
Carbon Fiber Reinforced Plastics (CFRP) have the advantages of light weight, high strength, corrosion resistance, fatigue resistance, convenience in construction and the like, and are widely used for reinforcing and maintaining bridges and various building components at present. In order to solve the problems of easy peeling at early stage, low strength utilization rate and the like caused by a common direct adhesion CFRP (carbon fiber reinforced plastics) reinforcing mode, a plurality of scholars research and provide a prestressed CFRP reinforcing method, and the prestressed CFRP plate reinforcing technology is widely applied to domestic bridge reinforcement and is widely accepted by the industry. However, the prestress loss inevitably occurs in the prestress CFRP reinforcement, so that the reinforcement effect is affected, and therefore, the prestress condition of the prestress CFRP material needs to be monitored and evaluated properly. Most of traditional prestress loss monitoring methods obtain prestress loss data by adhering a resistance strain gauge on the surface of a CFRP plate, the method is easily influenced by corrosion, electromagnetic interference, field monitoring conditions and the like, only can obtain data of a plurality of monitoring points, and is not suitable for long-term and large-scale health monitoring in actual engineering, and meanwhile, a rapid evaluation method for the reinforcement effect of a prestressed CFRP plate bridge is lacked.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a long-gauge-length-strain-based prestressed CFRP slab bridge reinforcing effect monitoring and CFRP slab prestress loss monitoring method.
The technical scheme is as follows: in order to solve the technical problem, the invention provides a method for monitoring the reinforcing effect of a prestressed carbon fiber plate bridge based on long gauge length strain, which comprises the following steps:
s1: arranging a plurality of long gauge length strain sensors on a prestressed carbon fiber plate reinforcing section of a monitored bridge;
s2: acquiring long gauge length strain original data of a carbon fiber plate in a prestressed carbon fiber plate reinforcement tensioning construction process and a long gauge length strain time-course curve of a single vehicle passing through a bridge after reinforcement is completed;
s3: collecting the long gauge length strain time range area caused by the passing of a single vehicle during the reinforcing construction operation of the prestressed carbon fiber plate at different time stages;
s4: after the prestressed carbon fiber plate bridge is reinforced, solving the size of the area surrounded by the long gauge length strain time-course curves of all the long gauge length sensors, and drawing a distribution map along the longitudinal direction of the bridge;
s5: the long gauge length strain time course of a single vehicle passing through the bridge at different periods is compared with the long gauge length strain time course curve of the single vehicle passing through the bridge at different periods by taking the long gauge length strain time course tested after the prestress tensioning is finished as a reference, and the prestress loss is evaluated according to the change of the calculated area distribution map;
s6: the reliability of the identification result is improved by analyzing the sample data for many times, and the prestress loss is evaluated by monitoring for a long time.
Preferably, in step S1, the reinforced bridge is a concrete bridge or a steel bridge of a T-beam, a hollow slab, a box girder, or the like.
Preferably, the long gauge length sensor is a long gauge length fiber grating sensor or a long gauge length resistance strain sensor, the two ends of the carbon fiber plate are anchored by anchors, and the middle of the carbon fiber plate is completely adhered to the bridge.
Preferably, the prestress carbon fiber plate reinforcement is monitored in two stages, namely prestress monitoring in the reinforcement process and prestress monitoring in the operation stage after reinforcement is completed, wherein the prestress monitoring is the reference standard of the prestress carbon fiber plate reinforcement.
Preferably, in step S3, the stress condition during the reinforcing process of the prestressed carbon fiber plate and the long gauge length strain time curve of the single vehicle passing through the bridge after the reinforcing process need to be collected, and the single vehicle does not limit the vehicle type, but limits the number of vehicles.
Preferably, in step S4, the prestress loss evaluation of the dynamic carbon fiber plate, i.e. the bridge reinforcing effect evaluation, is performed on the time-course area of the long gauge length strain caused by the passing of a single vehicle during the operation after the reinforcement is completed.
Preferably, in step S5, long gauge length strain time-course curves of the bridge at different times after the reinforcement is completed are solved according to the method of the present invention, and a distribution diagram of the prestress along the bridge direction is evaluated.
Has the advantages that: the method adopts a long gauge length strain sensor to obtain long gauge length strain at the bottom of a bridge in the process of prestress reinforcement tensioning construction and a long gauge length strain time course curve caused by a single vehicle passing through the bridge after reinforcement is finished as original data; acquiring a long gauge length strain time-course curve caused by the passing of a single vehicle during the operation period after reinforcement is completed; the prestress loss evaluation of the prestressed CFRP plate reinforced bridge is realized; and the prestress loss and the bridge reinforcing effect evaluation reliability are improved through multiple sample data analysis. The method can quickly evaluate the prestress loss of the prestressed CFRP plate reinforced bridge under the condition of not influencing the bridge reinforcing construction and the later-stage operation traffic, obtain the distribution condition of the prestress loss of the bridge, and provide a reliable basis for the management and maintenance of the bridge.
Drawings
FIG. 1 is a schematic diagram illustrating the principle of prestress reinforcement and reinforcement effect evaluation of a carbon fiber plate bridge;
FIG. 2 is a small box girder bridge model, but the invention is not limited to the bridge type;
FIG. 3 shows the position of a carbon fiber plate in the reinforcement of a prestressed carbon fiber plate bridge at the bottom of a beam;
FIG. 4 is a schematic view of the long gauge length sensor mounting location;
FIG. 5 is a long gauge length strain time course curve under different prestressing conditions;
FIG. 6 shows the size of the area enclosed by the long gauge length strain time curve under different working conditions.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and the detailed description.
The invention discloses a method for monitoring the reinforcing effect of a prestressed carbon fiber plate bridge based on long gauge length strain, which comprises the following steps of:
s1: arranging a plurality of long gauge length strain sensors on a prestressed carbon fiber plate reinforcing section of a monitored bridge; the reinforced bridge is a concrete bridge or a steel bridge of a T-shaped beam, a hollow plate and a small box beam, the long gauge length sensor is a long gauge length fiber grating sensor or a long gauge length resistance strain sensor, the two ends of the carbon fiber plate are anchored by an anchorage device, and the middle of the carbon fiber plate is completely adhered to the bridge;
s2: acquiring long gauge length strain original data of a carbon fiber plate in a prestressed carbon fiber plate reinforcement tensioning construction process and a long gauge length strain time-course curve of a single vehicle passing through a bridge after reinforcement is completed;
s3: collecting the long gauge length strain time range area caused by the passing of a single vehicle during the reinforcing construction operation of the prestressed carbon fiber plate at different time stages; stress conditions in the reinforcing process of the prestressed carbon fiber plate and a long gauge length strain time-course curve of a single vehicle passing through a bridge after the reinforcing process are required to be acquired, the type of the single vehicle is not limited, but the number of the vehicles is limited;
s4: after the prestressed carbon fiber plate bridge is reinforced, solving the size of the area surrounded by the long gauge length strain time-course curves of all the long gauge length sensors, and drawing a distribution map along the longitudinal direction of the bridge; after the reinforcement is finished, the prestress loss of the dynamic carbon fiber plate is evaluated through the long gauge length strain time range area caused by a single vehicle in the operation period, namely the bridge reinforcement effect is evaluated;
s5: the long gauge length strain time course of a single vehicle passing through the bridge at different periods is compared with the long gauge length strain time course curve of the single vehicle passing through the bridge at different periods by taking the long gauge length strain time course tested after the prestress tensioning is finished as a reference, and the prestress loss is evaluated according to the change of the calculated area distribution map; according to the method, long gauge length strain time-course curves of the bridge at different times after the reinforcement is finished are solved, and the distribution graph of the prestress along the bridge direction is evaluated;
s6: the reliability of the identification result is improved by analyzing the sample data for many times, and the prestress loss is evaluated by monitoring for a long time.
And carrying out two-stage monitoring on the reinforcement of the prestressed carbon fiber plate, wherein one is the prestress monitoring in the reinforcement process, and the other is the prestress monitoring in the operation stage after the reinforcement is finished, and the former is the reference standard of the latter.
The invention mainly deduces a solving formula of the long gauge length strain of the beam structure at the bottom of the prestressed carbon fiber plate prestressed reinforced beam according to the principle of monitoring the long gauge length strain of the bridge structure, and researches a prestressed carbon fiber plate prestressed reinforced beam on the basisA prestress loss monitoring method for a bridge reinforced by a stress carbon fiber plate. The beam structure shown in FIG. 1, assuming that the beam structure satisfies the assumption of a flat section, xiTo calculate the coordinates of the cross-section along the length of the structure, E, I, A, l, y are the modulus of elasticity of the structure, the moment of inertia of the cross-section to the neutral axis, the cross-sectional area, the calculated length of the beam, and the neutral axis height, respectively. After being tensioned, the carbon fiber plate has two ends anchored to the bottom of the beam and works together with the bridge concrete, and the tensioning force is FPreparation ofIt is worth to be noted that the sensor can only monitor the strain change after being arranged, so the theoretical analysis ignores the self weight of the structure. X caused by prestressed carbon fibre sheet reinforcementiLong gauge length strain of concrete at bottom of beam
(inside the anchor point) as shown in equation (1):
assuming a loss of tensile prestress, the prestress is noted as FPre-damage ofThen x at this timeiLong gauge length strain of concrete at the bottom of the beam
(inside of anchor point):
will be provided with
Compared with
According to the formula (3), the corresponding x can be evaluated by monitoring the long gauge length strain of the beam bottom concrete in the prestress tensioning process of the carbon fiber plateiLoss of prestress. However, most bridges have vehicles coming and going for a long time, and a method for monitoring prestress loss under vehicle load during operation after bridge reinforcement needs to be researched. As shown in FIG. 1, assume that the vehicle axle weight is Pi(the axle weight of the ith axle, i equals 1 to n), and the distance between the wheel i and the first wheel is denoted as di(i is 1 to n) and the vehicle speed is v. The strain influence line of the bridge under the load of the moving vehicle can be expressed by the formula (4), wherein xiStrain influence line equation fi(x) Comprises the following steps:
x under a moving load for a structure as shown in figure 1iThe long gauge strain response at (a) can be expressed as:
the integral of the long gauge length strain generated by the vehicle load along the length direction of the beam is as follows:
the integral of the long gauge length strain generated by the vehicle load along the length direction of the beam is as follows:
for long gauge length time-course area S caused by prestress reinforcementi pre(the area of the shaded portion in FIG. 1) can be represented by:
substituting the formula (2) into the formula (9) respectively to obtain:
the long gauge length strain time range area S of the vehicle reinforcing the bridge through the prestressed carbon fiber plate can be considered as the long gauge length strain time range area S of the vehicle reinforcing the bridge because all the materials are in the elastic rangeVehicle IAs shown in formula (11):
Si＝Svehicle I+Si pre (11)
Substituting Si pre-neutralization Si into formula 11 to obtain:
assuming that the bridge loses its tension prestress over time, Si lossIs xiThe long gauge length of the beam bottom is the strain time range area, if the speed of the vehicle passing through is vDecrease in the thickness of the steelMoving load of Pi lossThen S isi lossComprises the following steps:
equation (12) and equation (13) are simplified to the following form:
subtracting the formula (14) and the formula (15) and simplifying to obtain the moving load effect
And
as shown in equation (16):
through the derivation, the area size enclosed by the long gauge length strain time-course curves under different loads in the elastic range is linearly superposed, so that the area size enclosed by the long gauge length strain time-course curves can be used as the prestress loss evaluation index. The index can be theoretically deduced to realize the prestress loss condition evaluation of the prestress carbon fiber plate bridge reinforcement under the load of the moving vehicle through an equation (16).
A numerical simulation result is used for explaining a specific implementation method of the method, and FIG. 2 is a numerical model of a small box girder bridge used by the method, and the method is not limited to the small box girder bridge. The bridge deck is formed by splicing five small box girders, and is 33.5m wide and 35m long. The prestressed carbon fiber plates are respectively positioned at the left and right sides of the center line of the box girder by 15cm, and the tensile prestress of the prestressed carbon fiber plates is 1200MPa as shown in figure 3. And selecting a fifth small box girder as a monitoring object.
Step S1: and constructing a distributed long gauge length strain monitoring system.
The gauge length and the number of the sensors are selected according to the span of the bridge, the span of the bridge used in the method is 35m, the gauge length of the sensors is selected to be 1.4m, the monitoring area is 21m of span in the anchoring point, and the sensors are sequentially numbered from 1 to 15, as shown in figure 4.
Step S2: the method comprises the steps of collecting long gauge length strain at the bottom of a bridge under the condition of no prestress loss in the prestress reinforcement tensioning construction process and collecting long gauge length strain time range area caused by the passing of a single vehicle under the condition of no prestress loss as original data. The specific long gauge length strain is shown in figure 5 under the working condition of no prestress loss, and the specific long gauge length strain time range area is shown in figure 6 under the working condition I.
Step S3: the method comprises the steps of collecting long gauge length strain at the bottom of a bridge under the condition of prestress loss in the prestress reinforcement construction process (at the moment, the prestress is 1200Mpa) and the time-course area of the long gauge length strain caused by the passing of a single vehicle in the operation process. The specific prestress loss values and corresponding long gauge strains are shown in each prestress loss condition in fig. 5. The long gauge length strain time-course area caused by the passing of a single vehicle under each prestress loss working condition in the operation period is shown as working condition two, working condition three, working condition four and working condition five in the figure 6, and the prestress loss value and vehicle parameters of each working condition are shown in the table 2.
Step S4: and (3) evaluating the prestress loss of the prestressed carbon fiber plate reinforced bridge: and calculating, analyzing and evaluating the prestress loss according to the original data under the condition of no prestress loss and the data under the condition of prestress loss, and improving the reliability of the identification result through multiple sample data analysis. Taking the sensor No. 7 as an example, for example, in fig. 4, the long gauge length strain of the non-prestress loss working condition is-36.2 μ, the long gauge length strain of each prestress loss working condition is sequentially about-32.6 μ, -30.8 μ, -29.0 μ and-27.1 μ from large to small, and the results are substituted into the formula (3) to evaluate the prestress loss of the prestress carbon fiber plate, and specific calculation results and errors are shown in table 1. Similarly, the area of the long gauge length strain time course from the first working condition to the fifth working condition in the illustration 5 is as follows: -3.07 μ · s, -24.11 μ · s, -36.42 μ · s, 6.42 μ · s, -5.33 μ · s, and substituting the values into formula (16) to evaluate the prestress loss of the prestressed carbon fiber sheet, wherein the specific calculation results and errors are shown in table 2.
TABLE 1 static monitoring estimation results vs. actual values
TABLE 2 dynamic monitoring conditions and comparison of the estimated results with the actual values
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. A method for monitoring the reinforcing effect of a prestressed carbon fiber plate bridge based on long gauge length strain is characterized by comprising the following steps:
s1: arranging a plurality of long gauge length strain sensors on a prestressed carbon fiber plate reinforcing section of a monitored bridge;
s2: acquiring long gauge length strain original data of a carbon fiber plate in a prestressed carbon fiber plate reinforcement tensioning construction process and a long gauge length strain time-course curve of a single vehicle passing through a bridge after reinforcement is completed;
s3: collecting the long gauge length strain time range area caused by the passing of a single vehicle during the reinforcing construction operation of the prestressed carbon fiber plate at different time stages;
s4: after the prestressed carbon fiber plate bridge is reinforced, solving the size of the area surrounded by the long gauge length strain time-course curves of all the long gauge length sensors, and drawing a distribution map along the longitudinal direction of the bridge;
s5: the long gauge length strain time course of a single vehicle passing through the bridge at different periods is compared with the long gauge length strain time course curve of the single vehicle passing through the bridge at different periods by taking the long gauge length strain time course tested after the prestress tensioning is finished as a reference, and the prestress loss is evaluated according to the change of the calculated area distribution map;
s6: the reliability of the identification result is improved by analyzing the sample data for many times, and the prestress loss is evaluated by monitoring for a long time.
2. The long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method according to claim 1, characterized in that: in step S1, the reinforced bridge is a concrete bridge or a steel bridge of a T-beam, a hollow slab, or a box girder.
3. The long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method according to claim 1, characterized in that: the long gauge length sensor is a long gauge length fiber grating sensor or a long gauge length resistance strain sensor, the two ends of the carbon fiber plate are anchored by anchors, and the middle of the carbon fiber plate is completely adhered to the bridge.
4. The long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method according to claim 1, characterized in that: and carrying out two-stage monitoring on the reinforcement of the prestressed carbon fiber plate, wherein one is the prestress monitoring in the reinforcement process, and the other is the prestress monitoring in the operation stage after the reinforcement is finished.
5. The long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method according to claim 1, characterized in that: in step S3, the stress condition during the reinforcing process of the prestressed carbon fiber plate and the long gauge length strain time-course curve of the single vehicle passing through the bridge after the reinforcing process need to be collected, and the single vehicle does not limit the vehicle type, but limits the vehicle number.
6. The long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method according to claim 1, characterized in that: in step S4, after the reinforcement is completed, the prestress loss of the dynamic carbon fiber plate, that is, the bridge reinforcement effect, is evaluated in the long gauge length strain time-course area caused by the passage of a single vehicle during the operation.
7. The long gauge length strain-based prestressed carbon fiber plate bridge reinforcing effect monitoring method according to claim 1, characterized in that: in step S5, long gauge length strain time-course curves of the bridge at different times after the reinforcement is completed are solved according to the method of the present invention, and the distribution diagram of the prestress along the bridge direction is evaluated.
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| CN114941995A (en) * | 2022-04-20 | 2022-08-26 | 中国矿业大学 | Beam bridge steel structure deformation monitoring system based on distributed optical fiber strain test |
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