US Rt 23 Wayne Bridge Test Leading the technology in Structural Health Monitoring S. Paul Sumitro, Ph.D, PE Chris Roney US Rt 23 Wayne Bridge Test

Presentation outline What Smart Structures is Innovative sensory technology Smart Scanner Stick Scanner Telecentric (deflection) Telecentric (strain) Presentation outline

Schematic description of SHMS

Software for Bridge Health Monitoring

SHMS System

June , 2011 KRC Japan – Smart Structures USA Wayne Bridge Rt. 23 NJ

KRC Japan – Smart Structures USA Wayne team

Full-field Optical Monitoring Techniques 8 - 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 As the first step to evaluate bridge’s condition, field load test is needed to assure bridge’s safety level Troublesome in load test:Troublesome in load test: - Sensor installation; - Sensor installation; - cabling - cabling 9

Smart Scanner Non-destructive and non-contact: Non-destructive and non-contact: No scaffolding, no attachment, no cabling;No scaffolding, no attachment, no cabling; Speedy and appropriate information: Speedy and appropriate information: not only point-wise data, but also planar information; not only point-wise data, but also planar information; No image-warp: constant focus and constant distance; No image-warp: constant focus and constant distance; High resolution: High resolution: surface strain measurement,surface strain measurement, user-friendly software based on digital image correlation method.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 ★ 11

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 × 12

Digitalized Image Correlation Analyses Deforme d Pre- deform ed Range Scanner Sub set (N×N) Deforme d Pre- deforme d Sub set (N×N) Pre- deforme d Deforme d Pixel Digitalize d 13

Concrete Wood 14 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 Rear SecondarySecondary Primary dir Line sensor Scanning bar Stepping motor Linear encoder Front

Corrosive crack at pier cap

Crack gauge

Measured data Studs and mounts 19 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 scanner Stick Scanner development ×structural destructive ×Narrow field Development background ×crack  broken core

Stick Scanner specifications Sensor Adjuster ② Resolution ： 600dpi ① Range ： 350mm ③ Weight ： +/- 1kg ④ Interface ： USB ⑤ Scan length: Ver.3 ＝ 105mm Compact model Spec Ver.3 Ver.4 Tablet PC Ver.4 ： SD card Ver.4 ＝ 210mm Sensor Adjuster guide