Data Analyses
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Data Analyses. (-40,4). (-44,4). (-36,4). (-32,4). (-28,4). V= - μ 45= - μ H=21μ. V=58μ 45= - μ H=55μ. V=-34μ 45=45μ H=121μ. V=14μ 45=43μ H=112μ. V=371μ 45=168μH=319μ. 4mm. (-44,0). (-40,0). (-32,0). (-28,0). (-36,0). V= - μ 45= - μ H=23μ. V=-14μ 45=36μ H=425μ.

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38 2

Data Analyses

(-40,4)

(-44,4)

(-36,4)

(-32,4)

(-28,4)

V=-μ

45=-μ H=21μ

V=58μ

45=-μ H=55μ

V=-34μ

45=45μ

H=121μ

V=14μ

45=43μH=112μ

V=371μ45=168μH=319μ

4mm

(-44,0)

(-40,0)

(-32,0)

(-28,0)

(-36,0)

V=-μ 45=-μ H=23μ

V=-14μ

45=36μ

H=425μ

V=9μ

45=-26μ

H=338μ

V=37μ

45=-μ H=86μ

V=244μ45=140μH=364μ

-X

(-26,0)

4mm

(-32,-4)

(-28,-4)

(-44,-4)

(-40,-4)

(-36,-4)

V=32μ

45=-133μ

H=364μ

V=-μ 45=-μ H=141μ

V=-15μ

45=-μ H=42μ

V=30μ45=37μH=250μ

V=17μ45=27μH=84μ

4mm

4mm

4mm

4mm

2mm

(-38,-2)

Rozette Gauge φ50mm was used

V=25μ45=42μH=70μ

1


38 2

+Y

4mm

4mm

(-4,44)

(0,44)

(4,44)

V=-212μ

45=-μ H=-μ

V=-460μ

45=-μ H=-μ

V=-347μ

45=-μ H=-μ

4mm

(-4,40)

(0,40)

(4,40)

V=-120μ

45=-μ H=602μ

V=-149μ45=-μH=789μ

V=-42μ45=-μ H=-3μ

4mm

(-4,36)

(0,36)

(4,36)

V=-157μ

45=-92μ

H=33μ

V=-158μ

45=-52μ

H=40μ

V=-78μ

45=-4μ

H=48μ

(2,34)

V=-141μ

45=-42μ

H=36μ

4mm

(-4,32)

(0,32)

(4,32)

V=-3μ

45=53μH=81μ

V=-89μ

45=-3μ

H=27μ

V=-56μ

45=-5μ

H=60μ

Rozzette gauge

4mm

(0,28)

(4,28)

(-4,28)

V=372μ

45=-152μ

H=-701μ

V=-98μ

45=-60μ

H=-643μ

V=-457μ

45=-49μ

H=332μ

2mm

(0,26)

2


38 2

Magnified Image

Verification on Device Accuracy

Test Result

Concrete

Deviation:1.7%


38 2

Load test on a RC beam

Target

(West)

Target

(Centre)


38 2

WestStrain Distribution(X component only)

100KN

200KN

300KN

600KN

500KN

400KN

700KN

800KN

900KN

→←0.04

0.45→←

→←0.21

→←0.03

→←0.25


38 2

Test on RC beam

West Strain Distribution(X-dir component only)

400KN

500KN

(μ)

Unit:pixel

以下

Legend・・・ : Crack observed before loading

―-  : Crack propagate during loading

: Blot out of the water during loading


38 2

700

Prestressed Concrete Beam

Test Summary

2 points bending

40kN increments

Up to 280kN

Unit:mm

12 Φ12.7mm strand configuration

PC beam dimension


38 2

Surface strain

Distance from lower fiber

Main Scanning direction

250㎜

副走査方向

200㎜

150㎜

100㎜

Scanned area

Smart Scanner Setup

Strain gage configuration


38 2

Verification

Test Results


38 2

Verification

Test Results

160kN Crack occures


38 2

Strain measurement

Bottom slab

Central line

60mm gauge

30mm

gauge

Smart Scanner setup at the lower section

Strain gauge configuration


38 2

Strain measurement

Scanned strain countour

Pixel

(μ)

0KN

:Crack width < 0.08mm

120KN

160K

200KN

240KN

280KN

40KN

80KN

:Crack width > 0.08mm


38 2

Strain Measurement Method

Beam surface

Secondary dir

Distance from lower fiber196mm

Primary direction

Smart Scanner setup

Strain gauge


38 2

Results

Scanner and strain-gauge comparison


38 2

Test Result

Measured strain contour

80KN

120KN

160KN

200KN

240KN


38 2

Tokyo International Airport

Background

Haneda

Runway D (Open October 2010)

Runway D

- Serviceability assurance 100 years.

- Maintenance planning from design stage

Wharf

Landfill

- Wharf: precast slab; field pouring in between

- Provide holes for Stick Scanner to inspect concrete condition

Holes for stick scanner have been provided since construction stage

Maintenance strategy based on long term monitoring scheme to prolong structure’s life span


38 2

Field-poured concrete in between two precast concrete slabs

Pavement

Field poured concrete

PCa slab

Shear connectors

Stirrups

Stick Scanner

Crack

Steel beam

Inspection holes

Two types: φ22mm and φ26mm


38 2

Modification for Tokyo International Airport

connector

Front grip

Rear grip

sensor

Guide rail

①Resolution:300dpi

②Diameter:φ22mm,φ26mm

③Max. length:615mm

④Total length:890mm

⑤Weight:997g

⑥Connection:PC card - cable


38 2

Feature1

It works for two diameters

φ22mm

Adjust the focal length of sensor

Front guide ring

Rear guide ring

φ26mm

modifier


38 2

Feature2

1st turn:right, scan 1 cycle

2nd turn:insert 95mm, left, scan 1 cycle

3rd turn: insert 95mm, right, scan 1 cycle

4th turn: insert 95mm, left, scan 1 cycle

Turn right

Turn left

Insert 95mm

Insert 95mm

Turn right


38 2

Crack evaluation

φ22mm

Scan

(mm) 

Scale

(mm) 

Dev

(mm) 

0.05

0.03

0.08

0.15

0.02

0.17

0.05

0.08

0.03


38 2

φ26mm

Crack width

Scan

(mm) 

Scale

(mm) 

Dev

(mm) 

-0.03

0.17

0.20

-0.06

0.34

0.40

W=0.15mm

0.31

0.01

0.30

9mm

0.03

0.38

0.35

-0.08

0.25

0.17


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