US Rt 23 Wayne Bridge Test

Leading the technology in Structural Health Monitoring

S. Paul Sumitro, Ph.D, PEChris Roney

www.smart-structures.com

US Rt 23 Wayne Bridge Test

Presentation outline

What Smart Structures isInnovative sensory technology Smart Scanner Stick Scanner Telecentric (deflection) Telecentric (strain)

Presentation outline

Schematic description of SHMS

Software for Bridge Health Monitoring

SHMS System

June 10 -11, 2011

KRC Japan – Smart Structures USA

Wayne Bridge Rt. 23 NJ

KRC Japan – Smart Structures USA

Wayne team

Full-field Optical Monitoring Techniques

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- Smart Scanner: strain, stress

investigate internal concrete structures

- Stick Scanner:

- Strain- deflection

- Telecentric:

OVERVIEW

• As the first step to evaluate bridge’s condition, field load test is needed to assure bridge’s safety level

• Troublesome in load test: - Sensor installation; - cabling

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Smart Scanner

• Non-destructive and non-contact: • No scaffolding, no attachment , no cabling;

• Speedy and appropriate information: • not only point-wise data, but also planar

information;• No image-warp: constant focus and constant

distance; • High resolution:

• surface strain measurement, • user-friendly software based on digital image

correlation method. 10

Line Sensing Scanner

Flat head Image Scanner

★Resolution: 4800dpi

★ Wide range

Constant brightness(fix attachment,no external effect)

★

Simple and low cost★

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Flat Head Image Scanner

Driving shaft (motor, guiderail, timing belt)

Light Source

Line sensor

glass

CIS (Contact Image Sensor)

Primary Scanning direction

Secondary Scanning Direction

No lens (no aberration)

Light, compact, low cost

○

○

The resolution in secondary direction is lower than primary direction

×

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Digitalized Image Correlation Analyses

Deformed

Pre-deformed

Range

Scanner

Sub set (N×N)

Deformed

Pre-deformed

Sub set (N×N)

Pre-deformed

Deformed

Pixel Digitalized

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Concrete Wood

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Steel

15

turnable

高さ調節ネジ

ラ イ ン センサ

Full field scanner sensor

Line sensor

Fixer

Rotary table

shield

Full-field Scanner

Smart Scanner

Leg

Window

Micrometer adjuster

Focal digital meter

Thermometer （ surface ）

Thermometer （ sensor ）

Battery

RearSecondary

Primary dirLine sensor

Scanning bar

Stepping motor

Linear encoder

Front

Corrosive crack at pier cap

Crack gauge

Measured data

Studs and mounts

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Studs

Mounts

Smart Scanner installation

Crack width and crack distribution

Stick Scanner

Full field investigation, small drilled hole

Core○Material analyses

Endoscope

○low cost, constructability○Micro destructive

Combine pros

Handy scannerStick Scanner development

×structural destructive

×Narrow field

Development background

×crack broken core

Stick Scanner specifications

SensorAdjuster

②Resolution ：600dpi

①Range ： 350mm

③Weight ： +/- 1kg

④Interface ：USB

⑤Scan length: Ver.3 ＝ 105mm

Compact model

SpecVer.3

Ver.4

Tablet PC

Ver.4 ： SD card

Ver.4 ＝ 210mmSensorAdjuster

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