CN106383060B - Based on the thin concrete fatigue damage analysis method for seeing DYNAMIC COMPLEX stress monitoring - Google Patents

Based on the thin concrete fatigue damage analysis method for seeing DYNAMIC COMPLEX stress monitoring Download PDF

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CN106383060B
CN106383060B CN201610833441.9A CN201610833441A CN106383060B CN 106383060 B CN106383060 B CN 106383060B CN 201610833441 A CN201610833441 A CN 201610833441A CN 106383060 B CN106383060 B CN 106383060B
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stress
monitoring
component
concrete
sensor array
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CN106383060A (en
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侯爽
欧进萍
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South China University of Technology SCUT
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South China University of Technology SCUT
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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
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073—Fatigue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means

Abstract

The invention discloses a kind of based on the thin concrete fatigue damage analysis method for seeing DYNAMIC COMPLEX stress monitoring, comprising steps of first making a collection of test specimen, lays 9 space stress sensors in test specimen；By single shaft fatigue load test, sensor array when SDF value maximum is determined；By testing the method with simulation, the sensor array of optimization is laid in test specimen or model, determines each force modes lower member by SDF-N curve for being loaded into when fatigue failure；The sensor array optimized is laid in component before component to be measured pours, can detect that the force modes of component by sensor, by the Fatigue Damage States that the Comparative result of the SDF value of monitoring and test or simulation is obtained to component.The problem of can only unidirectionally monitoring the present invention overcomes previous concrete stress or strain monitoring, realizes the monitoring of space six-way dynamic stress in lesser volume, obtains true micro-stress state, more accurately analyzes the Fatigue Damage States of structure.

Description

Based on the thin concrete fatigue damage analysis method for seeing DYNAMIC COMPLEX stress monitoring
Technical field
The present invention relates to a kind of concrete fatigue damage analysis methods, are a kind of based on micro-stress monitoring specifically Concrete fatigue damage analysis method.
Background technique
Concrete structure develops to high-strength light direction, and existing limit condition design theory orientation is in making full use of material Expect intensity, cause many components in structure to be in high-stress state, and working stress luffing becomes closer to Fatigue Stress Amplitude, Cause concrete fatigue problem generally existing in engineering.Concrete material, component or even structure entirety drag under fatigue load Decaying will cause structural repair maintenance cost to dramatically increase, and even result in without the structure catastrophic failure of obvious omen or destruction, make At serious social influence.Carry out concrete fatigue damage monitoring to be of great significance.
Existing theoretical and experimental investigations can only realize the unidirectional monitoring to concrete stress or strain, can not effectively reflect clothes Complex stress effect, random load effect and the various factors coupling feature for using as a servant structural concrete fatigue problem, so very necessary Development concrete DYNAMIC COMPLEX stress monitoring and fatigue damage, which develop, to be studied, and establishes ideally theoretical research and complexity with this Reliable links under state between engineering service state.
Concrete fatigue is substantially the physical mechanism of the thin germinating for seeing micro-crack, expansion and unstability.Thin micro-crack of seeing exists It is reflected as concrete micro-stress on mechanics to be unevenly distributed, i.e. concrete micro-stress distribution is more discrete, concrete fatigue damage Hurt more serious.So the fatigue damage situation of concrete can be measured by the discreteness of monitoring concrete micro-stress distribution. Before this, the present inventor application application No. is 201110226050.8 patents to describe a kind of embedded concrete structure Whole dynamic damage process space stress sensor (such as Fig. 1), the sensor accuracy are high, resolution ratio up to 0.001MPa, can compared with Six-way dynamic micro-stress monitoring in space is realized in small volume, to obtain the true stress shape of service structure concrete State, the discreteness by observing concrete micro-stress can more accurately analyze the Fatigue Damage States of structure.
Summary of the invention
It is an object of the invention to invent a kind of method, is carefully seen and answered by DYNAMIC COMPLEX caused by monitoring concrete microcrack The discreteness of power obtains a kind of concrete fatigue damage analysis method.
The present invention adopts the following technical scheme that realization:
Based on the concrete fatigue damage analysis method of micro-stress monitoring, include the following steps:
First identical with the concrete component parameter to be measured test specimen of production a batch, equidistant cloth at a certain distance in each test specimen If 9 formation arrays and space stress sensor identical with component maximum aggregate size；
By single shaft fatigue load test, sensor array when SDF value maximum is determined, realize space stress sensor array Column optimization, wherein SDF value is thin sight distribution characteristics parameter:
σij,tWithRespectively micro-stress of the t moment i-th on jth aggregate and this to mean stress；
By testing the method with simulation, the space stress sensor array of optimization is laid in test specimen or model, really Fixed each force modes lower member is by SDF-N probability curve for being loaded into when fatigue failure；
The space stress sensor array optimized is laid in component before component to be measured pours, passes through space stress Sensor can detect that the force modes of component；
By the Comparative result of the SDF value of monitoring and test or simulation, so that it may evaluate the fatigue damage situation of component.
Further, the space stress sensor resolution is 0.001MPa, is suitble to carry out micro-stress to concrete Monitoring.
The present invention considers the influence of concrete strength and maximum aggregate size, material property and force modes, determines each allusion quotation The relationship of the discreteness and fatigue damage of component inside micro-stress under the conditions of type concrete parameters, concrete micro-stress from It dissipates property and is characterized by piezoelectric intelligent aggregate micro-stress with respect to the variance of the bias of its mean stress, be called thin see and be distributed Characteristic parameter (Stress distribution factor), abbreviation SDF.
The present invention six-way space stress sensor array monitoring inside concrete micro-stress being arranged in component Discreteness (is seen distribution characteristics parameter SDF and is characterized) with thin, just using concrete fatigue damage degree and micro-stress discreteness Related feature, passes through real-time monitoring SDF value, so that it may evaluate the fatigue damage situation of concrete component, convenient and efficient, accuracy rate It is high.
Detailed description of the invention
Fig. 1 is space stress sensor structure schematic diagram.
Fig. 2 is embodiment of the present invention flow chart.
Fig. 3 is first group of compression test specimen and sensor array schematic front view.
Fig. 4 is first group of compression test specimen and sensor array schematic top plan view.
Fig. 5 is second group of compression test specimen and sensor array schematic front view.
Fig. 6 is second group of compression test specimen and sensor array schematic top plan view.
Fig. 7 is third group compression test specimen and sensor array schematic front view.
Fig. 8 is third group compression test specimen and sensor array schematic top plan view.
Fig. 9 is the 4th group of compression test specimen and sensor array schematic front view.
Figure 10 is the 4th group of compression test specimen and sensor array schematic top plan view.
Figure 11 is stress test specimen and finite element model and sensor array schematic front view.
Figure 12 is stress test specimen and finite element model and sensor array schematic top plan view.
In figure: 1 --- space stress sensor；1-1——PZT；1-2 --- marble blocks；1-3 --- epoxy resin； 2 --- concrete sample.
Specific embodiment
The object of the invention will be described in further detail in the following with reference to the drawings and specific embodiments, and embodiment is not It can repeat one by one herein, but therefore embodiments of the present invention are not limited to the following examples.
Assuming that the concrete strength of component to be monitored is C30, maximum aggregate size 25mm.With this concrete strength and bone Illustrate embodiments of the present invention for material maximum particle diameter, other situations are similarly.Fig. 2 is embodiment flow chart, is seen based on thin The concrete fatigue damage analysis method of DYNAMIC COMPLEX stress monitoring, comprising steps of
1) pour 4 groups of compression concrete samples 2 identical with component parameter to be measured, concrete sample 2 having a size of 200mm × 200mm×200mm.Arrange that 9 space stress sensors 1, space stress size sensor are in advance in each test specimen before pouring 25mm × 25mm × 25mm (identical as component maximum diameter of aggrogate) mainly includes PZT1-1, marble blocks 1-2, epoxy resin 1-3 (as shown in Figure 1).Space stress sensor spacing is respectively 20mm, 30mm, 40mm, 50mm in 1st group to the 4th group test specimen, Space stress sensor arrangement array and position are as shown in Figures 3 to 10.
2) test of uniaxial compression fatigue loading is carried out to every group of test specimen until failure.It is measured by space stress sensor Stress draws each group respectively and carefully sees distribution characteristics parameter with load frequency curve i.e. SDF-N curve.Observe sensor spacing pair The influence of SDF, the distance of sensor is as sensor spacing optimal value when choosing SDF value maximum, and wherein SDF value is that thin see is distributed Characteristic parameter:
σij,tWithRespectively micro-stress of the t moment i-th on jth aggregate and this to mean stress；
Assuming that optimal spacing is 30mm.
3) influence of the force modes to SDF is considered, when force modes are uniaxial tension and compression or multiaxial compression, using the side of test Method pours 1 group of test specimen identical with concrete component parameter such as Figure 11 to Figure 12, sample dimensions be 200mm × 200mm × 200mm.Arrange that 9 sensors, size sensor are 25mm × 25mm × 25mm, spacing before pouring, in each test specimen in advance 30mm.Fatigue loading is carried out to test specimen, until failure, stress amplitude are as follows:
1. uniaxial compression is tired, stress amplitude 0.7fc；
2. uniaxial tension fatigue, stress amplitude 0.7ft；
3. biaxial test is tired, maximum stress amplitude 0.7fc, stress ratio 0.2,0.5.
Test specimen is established by being loaded into SDF-N probability curve of failure.
When force modes are any other force modes, using the method for simulation.With it is thin see finite element software establish with to The identical model of component parameter is surveyed, sample dimensions are 200mm × 200mm × 200mm, as is illustrated by figs. 11 and 12.Cloth in model 9 sensors are set, size sensor is 25mm × 25mm × 25mm, spacing 30mm.Uniaxial compression simulation first is carried out to model, it will SDF-N probability curve and uniaxial test Comparative result, correct finite element model parameter with this.After corrected parameter, to model into The fatigue loading test of any force modes of row, can obtain any force modes by being loaded into failure SDF-N probability curve.
4) sensor array optimized is laid in component before component to be measured pours, passes through space stress sensor Detect the force modes of component, so that it may using above-mentioned steps as a result, by monitoring SDF value, and with above-mentioned steps result pair Than evaluating the fatigue damage situation of component.
The above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to the present invention Embodiment restriction.For those of ordinary skill in the art, it can also make on the basis of the above description Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all of the invention Made any modifications, equivalent replacements, and improvements etc., should be included in the protection of the claims in the present invention within spirit and principle Within the scope of.

Claims (2)

1. the concrete fatigue damage analysis method based on micro-stress monitoring, characterized in that comprising steps of
First make a batch test specimen identical with concrete component parameter to be measured, equidistant laying 9 at a certain distance in each test specimen A formation array and space stress sensor identical with component maximum aggregate size；
By single shaft fatigue load test, sensor array when SDF value maximum is determined, realize that space stress sensor array is excellent Change, wherein SDF value is thin sight distribution characteristics parameter:
σij,tWithRespectively micro-stress of the t moment i-th on jth aggregate and this to mean stress, σij,0It indicates just Begin micro-stress of the moment i-th on jth aggregate,Indicate average value of the initial time i-th to all aggregate stress；
By testing the method with simulation, the space stress sensor array of optimization is laid in test specimen, determines each stress mould Formula lower member indicates fatigue life by SDF-N probability curve for being loaded into when fatigue failure, N；
The space stress sensor array optimized is laid in component before component to be measured pours, is sensed by space stress Device can detect that the force modes of component；
By the Comparative result of the SDF value of monitoring and test or simulation, so that it may evaluate the fatigue damage situation of component.
2. the concrete fatigue damage analysis method according to claim 1 based on micro-stress monitoring, it is characterized in that: institute Stating space stress sensor resolution is 0.001MPa, is suitble to carry out micro-stress monitoring to concrete.
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CN108152127B (en) * 2017-12-29 2020-10-02 哈尔滨工业大学深圳研究生院 Working stress monitoring device and method for concrete structure
CN110849724A (en) * 2019-11-23 2020-02-28 福州大学 Probability imaging method for damage identification of fabricated concrete shear wall
CN111198141A (en) * 2020-03-11 2020-05-26 烟台宏远氧业股份有限公司 Mesomechanics-based polymer-based composite material fatigue life prediction method

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