ICEA Midyear Meeting July 10, 2003

BRIDGE SESSIONSBRIDGE SESSIONS

Innovative Bridge Applications Innovative Bridge Applications AND AND

Physical Testing for Bridge Load Physical Testing for Bridge Load Rating Rating

ICEA Midyear MeetingJuly 10, 2003

Session SpeakersSession SpeakersSession SpeakersJustin Doornink, Ph.D. StudentTravis Konda, Ph.D. StudentVan Robbins, M.S. StudentJ. S. Ingersoll, WHKS & Co.Terry Wipf, ISUF. Wayne Klaiber, ISUBrent Phares, CTRE Scott Neubauer, Iowa DOT

ICEA Midyear Meeting July 10, 2003

Timber Bridges Timber Bridges –– A Viable A Viable AlternativeAlternative

Terry Wipf, Doug Wood, Brent Phares, Travis Hosteng

Bridge Engineering CenterIowa State University

Stress Laminated DeckStress Laminated DeckStress Laminated Deck

Stressing Bar

Lumber Laminations

Wearing Surface

Approx. Span Lengths of 16 to 38 ft.

Longitudinal Glued Laminated DeckLongitudinal Glued Laminated Longitudinal Glued Laminated DeckDeck

Wearingsurface Deck

Stiffener beam

Panel joint

Connector

Approx. Span Lengths 19 to 40 ft.

Glued Laminated StringerGlued Laminated StringerGlued Laminated Stringer

Wearing surfaceGlulam deck

Glulam beam

Approx. Span Lengths 35 to 150 ft.

FRP Reinforced Glulam GirdersFRP Reinforced FRP Reinforced GlulamGlulam GirdersGirders

FRP Laminate

Bridge Engineering Center ActivitiesBridge Engineering Center Bridge Engineering Center ActivitiesActivities

Design SpecificationsDesign StandardsDesign ManualResearch NeedsTimber Coalition

Timber Bridges Tested -Highway and Railway

Timber Bridges Tested Timber Bridges Tested --Highway and RailwayHighway and Railway

InstrumentationInstrumentationInstrumentation

VEHICLEACCELEROMETER

STORAGEOSCILLOSCOPE

PC

MOUNTED IN CAB OF VEHICLE

TAPESWITCH

TRANSDUCERSCONTROLLER

PC

-0.4

-0.3

-0.2

-0.1

0

0.1

0 100 200 300 400 500 600

TAPESWITCH

SIMU

LTAN

EOUS

DOF 3DOF 2DOF 1

DOF 4C.G.

DOF 5

Timber Plank Decks -- Load RatingTimber Plank Decks Timber Plank Decks ---- Load Load RatingRating

Timber Railroad BridgesTimber Railroad BridgesTimber Railroad Bridges