CN107237249A - Prefabricated assembled box type arch rib and damage detection method thereof - Google Patents
Prefabricated assembled box type arch rib and damage detection method thereof Download PDFInfo
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- CN107237249A CN107237249A CN201710310657.1A CN201710310657A CN107237249A CN 107237249 A CN107237249 A CN 107237249A CN 201710310657 A CN201710310657 A CN 201710310657A CN 107237249 A CN107237249 A CN 107237249A
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- 230000006378 damage Effects 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 title abstract 2
- 230000036541 health Effects 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 230000006735 deficit Effects 0.000 claims description 3
- 238000010606 normalization Methods 0.000 claims description 3
- 239000011374 ultra-high-performance concrete Substances 0.000 abstract description 14
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 11
- 239000004567 concrete Substances 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008376 long-term health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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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
- E01D4/00—Arch-type bridges
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/262—Concrete reinforced with steel fibres
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Food Science & Technology (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a prefabricated assembled box type arch rib and a damage detection method thereof, wherein the arch rib comprises a plurality of sections of box type arch rib prefabricated components which are sequentially spliced; piezoelectric intelligent aggregates are arranged on the upper part, the middle part and the lower part of the webs on the two sides of the box-type arch rib prefabricated part, the piezoelectric intelligent aggregates on the webs on one side are used as signal drivers, and the piezoelectric intelligent aggregates on the webs on the other side are used as signal sensors; the distance between the embedded position of the piezoelectric intelligent aggregate and the joint surface of the box-type arch rib prefabricated part is less than 15 cm. According to the invention, the ultra-high performance concrete is used as the shell of the piezoelectric intelligent aggregate, so that the PZT sheet can be better protected, and the compatibility is better, thereby realizing long-term monitoring of the structural health state.
Description
Technical field
The present invention relates to the technical field of structural engineering in wood engineering industry, particularly a kind of precast assembly box arch rib and
Its damage detecting method.
Background technology
Arch bridge is the structure based on compression.Conventional concrete arch bridge using the high concrete material of cheap compression strength as
It is main, a small amount of reinforcing bar resistance stress is configured, therefore be widely used.But over time, the across footpath of arch bridge by
It is cumulative big.Because conventional concrete is from great, the substantial amounts of interim auxiliary equipment of man-hour requirement is applied, construction cost rolls up, when
This problem more shows and protruded when across footpath increases.Ultra-high performance concrete (Ultra-High-Performance Concrete, letter
Claim UHPC) it is a kind of novel ultra-high strength, superhigh tenacity, the cement-base composite material of superelevation durability.UHPC standard resistance to compression
Intensity is more than 150MPa, it might even be possible to reach 250MPa.Arch can give full play to UHPC superelevation compression strength, in load at the same level
Under effect, UHPC arch crack width be about normal concrete arch 25%~50%, and cracking load, reinforcement yielding load and
Ultimate bearing capacity is significantly improved compared with normal concrete arch.UHPC by improving the fineness of composition and activity, without using
Coarse aggregate, to reduce material internal defect (microcrack and space) so as to obtain more than high durability.UHPC can be carried significantly
Rate of utilization of strength of the Gao Gang in concrete, goes into the steel-concrete that concrete, steel fibre, reinforcing bar more coordinate and is combined new mould
Formula, realizes the high-strength light and high tenacity of concrete structure.
To adapt to the continuous growth of arch bridge across footpath, the section form and construction technology of arch rib are also changed.Box
It is big that arch rib has the advantages that good bending resistance anti-twisting property, section hollow out rate, substantial amounts of to alleviate dead load.Rib-lifting section is pre-
Assembling process processed has the advantages that speed of application is fast, construction quality is good, mechanization degree is high.Seam is section assembling construction bridges
Special tectonic, globality, stability, shock resistance and the bridge floor ride comfort of structure etc. all have very big with being connected the reliability of seam
Relation.In prefabricated subsection constructing structure, the seam between section plays a part of shearing and pressure on transmission interface, but its is firm
Degree and shearing strength are all smaller than neighbouring section, are the stress weak parts of bridge.Therefore, the shear behavior of seam is to bridge
Ultimate service state and ultimate limit states holistic resistant behavior influence it is very big, the long-term health of joint of bridge is supervised
Survey also becomes particularly important.The dry joint form of conventional concrete has mitre, stepped seam, shearing resistance tooth block seam, shear connector
Four kinds of seam.Wherein mitre shear resistance is poor, and stepped seam is also easy to produce crack, shearing resistance tooth block seam and shear connector seam
With good shear resistant capacity, but the assembled all tools of prefabricated, construction acquire a certain degree of difficulty.Therefore, it is necessary to which abutment joint face is carried out
Optimization design and Long Period Health Monitoring.
Piezoelectric ceramics (PZT), because of its distinctive positive inverse piezoelectric effect, can not only be used for sensing as the representative of piezoelectric
Device, also can be as driver, and has the advantages that cheap, sound frequency range, fast response time, is widely used in intellectual monitoring
With damage diagnostic field.In actual applications, piezoelectric ceramics is often fabricated to piezoelectric intelligent aggregate, is embedded in structure specific bit
Put, permanent health monitoring is carried out to structure.The crucial connecting portion having not yet to see in box-structure precast assembly is pre-buried
Piezoelectric intelligent aggregate carries out the related document of health monitoring.
The content of the invention
The present invention is intended to provide a kind of precast assembly box arch rib and its damage detecting method, improve the strong of box arch rib
Degree, toughness and durability, realize the permanent monitoring of structural health conditions.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of precast assembly box arch rib, including
The box arch rib prefabricated components that multistage splices successively；It is the coxostermum top of box arch rib prefabricated components two, middle part, equal at bottom
The piezoelectric intelligent aggregate being provided with piezoelectric intelligent aggregate, and a wherein coxostermum is used as on signal driver, another coxostermum
Piezoelectric intelligent aggregate be used as signal transducer；The pre-buried position of the piezoelectric intelligent aggregate and connecing for box arch rib prefabricated components
The distance between seam face is less than 15cm.
The piezoelectric intelligent aggregate is connected with data collecting instrument, is easy to send and receive signal.
It is equipped with the joint face of adjacent two sections of boxes arch rib prefabricated components on bracket, and the bracket and offers installation
Hole；The connecting rod of the corresponding mounting hole can be inserted by being equipped with the joint face of adjacent two sections of boxes arch rib prefabricated components, and structure is more
It is solid and reliable.
The bracket tilting section and horizontal plane angle θ span are 15 ° to 45 °；The bracket seam height H1With
The height H of box arch rib2Ratio be 1/2；Bracket key teeth depth D and bracket seam height H1Ratio >=1/9.It ensure that and connect
Seam face shear behavior, and reduction box rib-lifting section is prefabricated, the difficulty of construction such as assembly of constructing.
The depth of the mounting hole is identical with the bracket key teeth depth D；The length of the connecting rod and the bracket key
Tooth depth D is identical, is further ensured that stabilized structure.
The mass ratio of the box arch rib prefabricated components material is：Cement：Quartz sand：Silicon ash：Water reducer：Steel fibre=1：
1.1：0.25：1.5：0.02.
The quartz sand average grain diameter is 300nm；Silicon ash average grain diameter is 100nm；Water reducer is efficient using polyocarboxy acid type
Water reducer, water-cement ratio is 0.18；Length of steel fiber is 12mm, a diameter of 0.02mm, and compression strength is more than 2600MPa.
Correspondingly, present invention also offers a kind of damage monitoring method of precast assembly box arch rib, comprise the following steps：
1) the sine sweep signal that signal transducer collection signal driver is sent, and the sine sweep signal is carried out small
Ripple bag energy spectrometer, the Wavelet Packet Energy Spectrum vector E that selection decomposition level is iiIn before m large energy coefficient characteristic frequency
Band, by the energy ratio I of each characteristic frequency bandkIt is used as structural damage alarming parameter：
Wherein, Ei,kAnd Ei,jK-th of characteristic frequency band energy and all characteristic frequencies band energy are represented respectively；
2) by the energy ratio I of each characteristic frequency bandkIt is adjusted by maximum normalization, then passes through these energy ratios Ik
Change judge the degree of impairment of structure, i.e.,Wherein, ERVkFor k-th characteristic frequency band
Energy ratio changes；IukAnd IdkRespectively structure is in health and the energy ratio of k-th of characteristic frequency band under faulted condition；Work as ERVk's
When value is more than 10%, into alert status；As energy ratio changing value ERVkValue be more than 70% when, stop using immediately.
Compared with prior art, the advantageous effect of present invention is that：The present invention is made using ultra-high performance concrete
Box arch rib, significantly improves the intensity, toughness and durability of box arch rib, drastically reduce the area deadweight and the arrangement of reinforcement number of structure
Amount, so as to improve the span ability of structure.The present invention uses Precast Concrete Segmental Bridges construction technology, is easy to ultra-high performance concrete case
The maintenance of type arch rib, it is ensured that construction quality, accelerates construction progress.The present invention uses bracket-latch seam, is ensureing that its is superior
On the premise of shear behavior, the difficulty of construction such as precast segment, construction assembly can be reduced.The present invention is made using ultra-high performance concrete
For the housing of piezoelectric intelligent aggregate, PZT pieces not only can be preferably protected, but also with preferable compatibility, realize structure
The permanent monitoring of health status.
Brief description of the drawings
Fig. 1 is the assembled schematic diagram of prefabricated box arch rib；
Fig. 2 is bracket-latch joint face schematic diagram；
Fig. 3 is prefabricated box arch rib seam elevation；
Fig. 4 is the pre-buried position view of piezoelectric intelligent aggregate；
Fig. 5 is rib-hoisting schematic diagram；
Wherein：
1：Prefabricated box arch rib component；2：Connecting rod；3：Mounting hole；4：Piezoelectric intelligent aggregate；5：Hanger rope；6：Hoist cable；7：
Drag-line.
Embodiment
Arch rib component of the present invention is shown in Fig. 1, and its joint face enlarged drawing is shown in Fig. 2, and arch rib manufacturing process and monitoring process are as follows：
(1) ultra-high performance concrete (UHPC) mix-design：Cement：Quartz sand：Silicon ash：Water reducer：Steel fibre=1：
1.1：0.25：1.5：0.02 (mass ratio), wherein cement use PO52.5 grades of Portland cements of standard, the average grain of quartz sand
Footpath is in 300nm or so, and silicon ash average grain diameter is in 100nm or so, and water reducer uses polycarboxylic type high performance water reducer, and water-cement ratio is
0.18, length of steel fiber 12mm, diameter 0.02mm, compression strength are more than 2600MPa.
(2) by required various raw material, weighed by the proportioning of setting, by cement, silicon ash, quartz sand, water, diminishing
The order input mixer of agent is stirred 7 minutes, and whole steel fibres are added under not stopped status and are mixed 1 minute, will be mixed
Uniform slurry injection vacuum pumping tank, then under pressure, at a slow speed injects mixture on the model for getting framework of steel reinforcement ready,
And low frequency ram-jolt in the horizontal direction.The mould for having poured slurry is sent into 45 DEG C of fog rooms and carries out maintenance 12h for the first time.Through once
Just support and form idiosome and reach after intensity, the demoulding, the secondary fog room of marshalling feeding are conserved after 90 DEG C of thermostatic curing 48h and completed.
In above-mentioned steps (2), box arch rib joint face uses bracket-latch seam, and its model is as shown in figure 3, bracket water
The span of flat inclination angle theta is 15 ° to 45 °, and D is key teeth depth, H1For bracket seam height, H2For the height of box arch rib, ox
Leg seam depth height compares D/H1>=1/9, bracket seam height with box arch rib height the ratio between H1/H2=1/2.When pouring box arch rib,
Built-in fitting is installed at model two ends, and wherein one end built-in fitting is provided with preformed hole, reserves hole depth identical with strong tooth depth D.It is another
The high intensity connecting rod matched with preformed hole is fixed with the built-in fitting at end.The peripheral hardware length of high intensity connecting rod 2 and strong tooth depth
Spend D identical.
In above-mentioned steps (2), with protective housing of the ultra-high performance concrete as piezoelectric intelligent aggregate 4, completed through maintenance
Afterwards, the piezoelectric ceramics by water-proofing treatment and external shielding line is wrapped up, is prepared into piezoelectric intelligent aggregate 4.Pouring box arch
During rib, piezoelectric intelligent aggregate is embedded in the coxostermum top of box arch rib two, middle part, position, Mei Gejie at bottom three
Arrange that piezoelectric intelligent aggregate pre-buried in 6 piezoelectric intelligent aggregates, one of box arch rib drives as signal near seam face altogether
Device is moved, then the piezoelectric intelligent aggregate in adjacent box arch rib is used as signal transducer.And the pre-buried position of intelligent aggregate is away from joint face
Distance not be preferably greater than 15cm.
(3) prefabricated box arch rib is moved to immediately below corresponding bridge location, by preformed hole (i.e. mounting hole 3) and connecting rod 2
After cleaning out, epoxide-resin glue is uniformly smeared with rod surface in preformed hole, then by adjacent box arch rib prefabricated components 1
Lifting is in place, adjusts linear afterwards in place, connecting rod is aligned into preformed hole, is slowly advanced in preformed hole, until joint face agrees with intact,
Gradually tensioning drag-line 7, and loosen hoist cable 6, strict control Stayed-buckle Cable Forcess and arch rib absolute altitude, until hoist cable is unloaded completely after drag-line is installed
Under, all lifting components are spliced to form arch rib successively.
(4) by BNC connector, the shielding line that piezoelectric intelligent aggregate is drawn and Multipurpose Data Acquisition Instrument device-NI6363
Connect, then connected NI6363 with computer by usb communication line, control NI6363 to drive intelligent aggregate by computer
Launch 100HZ-150kHZ sine sweep signal, the amplitude of its signal is 10V, then passes through intelligent aggregate sensor by NI6363
The response signal passed over is received, and the data measured are stored in notebook computer.
(5) signal of collection is subjected to wavelet-packet energy analysis with matlab wavelet analysises program, using Daubechies
Small echo is as the wavelet function of structural damage alarming, the Wavelet Packet Energy Spectrum vector E that selection decomposition level is iiIn before m it is larger
The characteristic frequency band of energy coefficient, by the energy ratio I of each characteristic frequency bandkIt is used as structural damage alarming parameter：
E in formulai,kAnd Ei,jK-th of characteristic frequency band energy and all characteristic frequencies band energy are represented respectively.
By the energy ratio I of each characteristic frequency bandkIt is adjusted by maximum normalization, then passes through these energy ratios Ik's
Change (Energy Ratio Variation, abbreviation ERV) to judge the degree of impairment of structure, i.e.,
In formula, ERVkFor the energy ratio change of k-th of characteristic frequency band；IukAnd IdkRespectively structure is in health and damage shape
The energy ratio of k-th of characteristic frequency band under state.The ERV under structural health conditionskValue be about 0, with the increase of degree of injury,
Change ERV of each characteristic frequency of Wavelet Packet Energy Spectrum with energy ratiokValue be also continuously increased, and change will be apparent from, work as energy
Amount is than changing value ERVkValue be more than 10% when, structure enters alert status；As energy ratio changing value ERVkValue be more than
When 70%, it is necessary to stop the use to structure immediately.
Claims (10)
1. a kind of precast assembly box arch rib, it is characterised in that the box arch rib prefabricated components (1) spliced successively including multistage；
The coxostermum top of box arch rib prefabricated components (1) two, middle part, it is mounted on piezoelectric intelligent aggregate (4) at bottom, and wherein
The piezoelectric intelligent aggregate (4) that piezoelectric intelligent aggregate (4) on one coxostermum is used as on signal driver, another coxostermum is used as letter
Number sensor；The distance between the pre-buried position of the piezoelectric intelligent aggregate (4) and the joint face of box arch rib prefabricated components (1)
Less than 15cm.
2. precast assembly box arch rib according to claim 1, it is characterised in that the piezoelectric intelligent aggregate (4) and number
Connected according to Acquisition Instrument.
3. precast assembly box arch rib according to claim 1, it is characterised in that adjacent two sections of boxes arch rib prefabricated components
(1) it is equipped with joint face on bracket, and the bracket and offers mounting hole (3)；Adjacent two sections of boxes arch rib prefabricated components
(1) connecting rod (2) of the corresponding mounting hole (3) can be inserted by being equipped with joint face.
4. precast assembly box arch rib according to claim 3, it is characterised in that the bracket tilting section is pressed from both sides with horizontal plane
Angle θ span is 15 ° to 45 °.
5. precast assembly box arch rib according to claim 3, it is characterised in that the bracket seam height H1With box
The height H of arch rib2Ratio be 1/2；Bracket key teeth depth D and bracket seam height H1Ratio >=1/9.
6. precast assembly box arch rib according to claim 5, it is characterised in that the depth of the mounting hole (3) and institute
State bracket key teeth depth D identical；The length of the connecting rod (2) is identical with the bracket key teeth depth D.
7. precast assembly box arch rib according to claim 1, it is characterised in that the box arch rib prefabricated components (1)
The mass ratio of material is：Cement：Quartz sand：Silicon ash：Water reducer：Steel fibre=1：1.1：0.25：1.5：0.02.
8. precast assembly box arch rib according to claim 6, it is characterised in that the quartz sand average grain diameter is
300nm；Silicon ash average grain diameter is 100nm；Water reducer uses polycarboxylic type high performance water reducer, and water-cement ratio is 0.18；Steel fibre is long
Spend for 12mm, a diameter of 0.02mm, compression strength is more than 2600MPa.
9. a kind of damage detecting method of precast assembly box arch rib, it is characterised in that comprise the following steps：
1) the sine sweep signal that signal transducer collection signal driver is sent, and wavelet packet is carried out to the sine sweep signal
Energy spectrometer, the Wavelet Packet Energy Spectrum vector E that selection decomposition level is iiIn before m large energy coefficient characteristic frequency band,
By the energy ratio I of each characteristic frequency bandkIt is used as structural damage alarming parameter：Its
In, Ei,kAnd Ei,jK-th of characteristic frequency band energy and all characteristic frequencies band energy are represented respectively；
2) by the energy ratio I of each characteristic frequency bandkIt is adjusted by maximum normalization, then passes through these energy ratios IkChange
Change to judge the degree of impairment of structure, i.e. ERVk=│ I │uk-Idk, wherein, ERVkFor the energy ratio of k-th of characteristic frequency band
Change；IukAnd IdkRespectively structure is in health and the energy ratio of k-th of characteristic frequency band under faulted condition；Work as ERVkValue it is big
When 10%, into alert status；As energy ratio changing value ERVkValue be more than 70% when, stop using immediately.
10. the damage detecting method of precast assembly box arch rib according to claim 9, it is characterised in that the sine
The amplitude of swept-frequency signal is 10V.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108239915A (en) * | 2018-01-19 | 2018-07-03 | 韩玉 | Ultra-high performance concrete deck type box arch bridge precast segment installation method |
| CN108570920A (en) * | 2018-05-21 | 2018-09-25 | 东北林业大学 | A kind of construction and construction method of precast segment assembly concrete arch-type bridge |
| CN111827123A (en) * | 2020-07-27 | 2020-10-27 | 田育民 | Bridge cantilever quick positioning device |
| CN112962458A (en) * | 2021-02-04 | 2021-06-15 | 四川省公路规划勘察设计研究院有限公司 | Technical test method for pumping and pouring concrete in main arch tube of concrete-filled steel tube arch bridge |
| CN115142358A (en) * | 2022-06-10 | 2022-10-04 | 中电建路桥集团有限公司 | Cantilever construction control method and device for prestressed curved beam bridge |
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| CN112962458A (en) * | 2021-02-04 | 2021-06-15 | 四川省公路规划勘察设计研究院有限公司 | Technical test method for pumping and pouring concrete in main arch tube of concrete-filled steel tube arch bridge |
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