1

(-38,-2)V=25μ

　45=42μ 　H=70μ

2mm

4mm

4mm

4mm

4mm

4mm

4mm

(-44,4)V= － μ 45= －μ H=21μ

(-40,4)V=58μ45= －μ H=55μ

(-36,4)V=-34μ45=45μH=121μ

(-32,4)V=14μ45=43μ　H=112μ

(-28,4)V=371μ　45=168μH=319μ

(-44,0)V= － μ 45=－ μ H=23μ

(-40,0)V=37μ45= －μ H=86μ

(-36,0)V=-14μ45=36μH=425μ

(-32,0)V=9μ45=-26μH=338μ

(-28,0)V=244μ　45=140μ 　H=364μ

(-44,-4)V= － μ 45= －μ H=141μ

(-36,-4)V=30μ　45=37μH=250μ

(-32,-4)V=17μ

　45=27μH=84μ

(-28,-4)V=32μ

45=-133μH=364μ

(-40,-4)V=-15μ45= －μ H=42μ

-X(-26,0)

Rozette Gauge φ50mm was used

Data Analyses

2

(2,34)V=-141μ45=-42μH=36μ

2mm

4mm

4mm

4mm

4mm

4mm

4mm

(-4,36)V=-78μ45=-4μH=48μ

(4,36)V=-158μ45=-52μH=40μ

(-4,32)V=-3μ45=53μH=81μ

(4,32)V=-56μ45=-5μH=60μ

(4,28)V=372μ45=-152μH=-701μ

(-4,28)V=-98μ45=-60μH=-643μ

+Y

(-4,44)V=-460μ45= －μ H=－ μ

(-4,40)V=-120μ45= － μ H=602μ

(4,44)V=-347μ45= － μ H= －μ

(4,40)V=-42μ45= － μ H=-3μ

(0,26)

Rozzette gauge

(0,28)V=-457μ45=-49μH=332μ

(0,32)V=-89μ45=-3μH=27μ

(0,36)V=-157μ45=-92μH=33μ

(0,40)V=-149μ45= －μH=789μ

(0,44)V=-212μ45= － μ H= －μ

y = 0.9815x + 1.057

R2 = 0.9998

0

100

200

300

400

500

600

700

0 200 400 600

μスキャナによる計測値（ ）

μひ

ずみ

ゲー

ジに

よる

計測

値（

）

1 2 3 4 5 平均 標準偏差 補正値 差 （％）

ゲージ値 0 0 1 0 1 0

解析値 1 -2 2 1 2 1 1.32 2 2 1.60

ゲージ値 100 100 100 100 100 100

解析値 98 98 95 98 95 97 1.51 96 -4 -3.71

ゲージ値 201 202 202 201 200 201

解析値 203 201 205 205 201 203 1.70 200 -1 -0.33

ゲージ値 300 301 301 302 300 301

解析値 305 303 309 306 303 305 2.12 301 0 0.05

ゲージ値 401 401 401 401 401 401

解析値 410 411 412 412 413 411 1.09 405 4 1.07

ゲージ値 502 500 500 501 502 501

解析値 498 504 503 507 507 504 3.45 496 -5 -1.03

ゲージ値 600 600 600 601 601 600

解析値 612 608 608 613 612 611 2.00 600 0 0.03

1.98 2.20 1.12絶対値の平均

400μ

500μ

600μ

1200dpi

0μ

100μ

200μ

300μ

Deviation ： 1.7%

Test Result

Concrete

Verification on Device Accuracy

Magnified Image

Load test on a RC beam

ひずみ計測範囲（西側）

ひずみ計測範囲（中央）

Target(West)

Target(Centre)

West 　 Strain Distribution 　（ X component only ）

→←0.04

→←0.03

0.45→← →←0.21

→←0.25

900 KN700 KN 800 KN

600 KN 500 KN 400 KN

300 KN200 KN100 KN

West Strain Distribution （ X-dir component only ）

400 KN

以下

Legend ・・・ ： Crack observed before loading―- 　： Crack propagate during

loading： Blot out of the water during loading

Unit ：pixel

（ μ ）

500 KN

Test on RC beam

Test Summary

Prestressed Concrete Beam

２ points bending

Up to ２８０ｋ N

12 Φ12.7ｍｍ strand configurati

on

４０ｋ N increments

700PC beam dimension

Unit ：mm

Surface strain

Main Scanning direction

副走査方向

100 ㎜

150 ㎜

200 ㎜

250 ㎜

Strain gage configurationSmart Scanner Setup

Distance from lower fiber

Scanned area

Test Results

Verification

-100 0 100 200 300100

150

200

250 40KN

ひずみゲージ

新型装置

計算値

Strain(μ）

Dis

tan

ce f

rom

low

er

fib

er（ｍｍ）

Strain gauge

Smart Scanner

Analytical

-100 0 100 200 300100

150

200

250 80KN

ひずみゲージ

新型装置

計算値

Strain（ μ）

Strain gaugeSmart Scanner

Analytical

Test Results

Verification

-200 -100 0 100 200 300100

150

200

250120KN

ひずみゲージ新型装置計算値

Strain(μ）

Dis

tance

fro

m low

er

fiber（

mm）

Strain gauge

Smart Scanner

Analytical

-100 0 100 200 300100

150

200

250 160KN

ひずみゲージ新型装置計算値

Strain（ μ）

Strain gauge

Smart Scanner

Analytical

１６０ｋ N Crack occures

Bottom slab

Strain measurement

Strain gauge configuration

Smart Scanner setup at the lower section

Central line

60mm gauge

30mmgauge

Strain measurement

０ KN40KN80KN120KN160K200KN ： Crack width <

0.08mm240KN280KN

： Crack width > 0.08mm

Pixel （ μ ）

Scanned strain countour

Beam surface

Strain Measurement Method

Primary direction

Secon

dary

d

ir

Distance from lower fiber196mm

Strain gaugeSmart Scanner setup

Results

Measured Point

Load （ KN)

Strain(μ)Error(μ) Average(μ)

Gauge Scanner

CL-x

80 -12 -13 1

2

120 -18 -21 3

160 -24 -22 2

200 -7 -8 1

240 110 113 3

CL-y

80 3 -3 6

11

120 4 -6 10

160 2 16 14

200 -17 -4 13

240 -23 -33 10

CL-z

80 8 10 2

8

120 11 16 5

160 14 17 3

200 24 50 26

240 45 39 6

Scanner and strain-gauge comparison

Test Result

80KN120KN

160KN200KN240KN

Measured strain contour

Background

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

Runway D （ Open October 2010 ）

- Wharf: precast slab; field pouring in between- Provide holes for Stick Scanner to inspect concrete condition

Tokyo International Airport

- Serviceability assurance 100 years.- Maintenance planning from design stage

Holes for stick scanner have been provided since construction stage

LandfillWharf

Haneda

Runway D

Field-poured concrete in between two precast concrete slabs

Crack

Inspection holesTwo types: φ22mm and φ26mm

PCa slab

Shear connectors

Field poured concrete

Steel beam

Pavement

Stirrups

Stick Scanner

Modification for Tokyo International Airport

①Resolution ：300dpi

②Diameter ：φ22mm ， φ26mm

③Max. length ：615mm⑤Weight ：997g

⑥Connection ： PC card - cable

connector

Rear gripFront grip

Guide rail

sensor

④Total length ： 890mm

Feature１It works for two diameters

φ22mm

φ26mm

Rear guide ring

Front guide ring

modifier

Adjust the focal length of sensor

Feature２

1st turn ： right, scan 1 cycle

2nd turn ： insert 95mm, left, scan 1 cycle3rd turn: insert 95mm, right, scan 1 cycle

Turn rightTurn left

Turn right

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

Insert 95mm

Insert 95mm

Crack evaluation

φ22mm

0.080.05 0.03

Scale（ｍ

ｍ）　

Scan（ｍ

ｍ）　

Dev（ｍ

ｍ）　

0.170.15 0.02

0.080.05 0.03

0.20 0.17 -0.03

Scale（ｍ

ｍ）　

Scan（ｍ

ｍ）　

Dev（ｍ

ｍ）　

0.340.40 -0.06

0.310.30 0.01

0.38

0.17

0.35

0.25

0.03

-0.08

Crack width

9mm

W=0.15mm

φ26mm