Mark R. Laistner, P.E. Stephen C. Catherman, P.E. Erdman Anthony & Assoc., Inc. Steuben County DPW 2165 Brighton Henrietta Townline Rd. 3 E. Pulteney Square Rochester, NY 14623 Bath, NY 14810 (585)427-8888 ext. 257 (607) 664-249 LaistnerMR@erdmananthonhy.com SteveC@co.steuben.ny.us Synopsis:

The Wood Road Bridge is a 207-foot, single-span wrought iron through truss bridge carrying Wood Road over the Cohocton River in the Town of Campbell, New York. Built in 1897, the bridge is an intact, representative example of a pin-connected, wrought iron, Baltimore truss bridge. The Baltimore truss design is a late nineteenth century adaptation of the Pratt truss design that incorporates sub-struts to form middle panel points for longer spans. The bridge also contains Phoenix tube compression members (patented in 1862) that were a significant technological advance in truss bridge construction.

This presentation will detail the design and construction of the rehabilitation of this historic structure.

About the Presenters:

Mark Laistner has a B.S. degree in Civil Engineering from SUNY Buffalo, 1987. He is a licensed Professional Engineer in New York, Pennsylvania and Maine and a certified Bridge Inspector in Pennsylvania. Mark has been a Senior Associate at Erdman, Anthony and Associates, Inc. for seven years. He is the Team Leader and Project Manager for municipal bridge projects. He previously worked for LaBella Associates, P.C. where he was the Project Manager and Lead Structural Engineer for the Wood Road Bridge rehabilitation.

Stephen C. Catherman has been a N.Y.S. Licensed Professional Engineer for 14 years and has worked for Steuben County Dept. of Public Works Engineer for the past 13 years. Previously, he worked in the Structures, Construction, and Planning Departments of NYSDOT's Reg. 6 office for 8 years. He currently manages Steuben County's 331 bridges, including all federally-aided, locally-administered projects such as the Wood Road bridge.

SESSION 3.3

Wood Road Bridge over the Cohocton River Rehabilitation of a Historic Wrought Iron Truss Bridge

In Steuben County

Rehabilitationof the

Historic Wood Road Bridge

presented at the

Eleventh Statewide Conferenceon

Local Bridges

Project Information

• Bridge Owner: Steuben County • Locally Administered Federal Aid Project, Funded

By:– Federal Highway Administration (FHWA)– New York State Dept. of Transportation (NYSDOT)– Steuben County– Town of Campbell

• Designer: Erdman Anthony & Associates, Inc.• Contractor: Vector Construction Corp.

SteubenCampbell

Cohocton River

Canisteo River Chemung Ti

oga

RiverRi

ver

Keuka

Lak

e

Hornell

Corning

Bath

Town of Campbell

Late 1800’s

Red Bridge

Red Bridge Location

In–DepthBridge Inspection

Bridge Deficiencies

• Displaced Truss Expansion Bearings• Corroded Top Lateral Struts• Corroded Stringers• Deteriorated Timber Deck• Deteriorated Paint• Inadequate Bridge Railing• Low Live Load Capacity

Material Samplingand

Testing

Floorbeam Web Coupon5” x 2” x ¼”

Floorbeam Flange Coupon5” x 1 ½” x 5/16”

Phoenix Tube Coupon1” x 3/16 ”

Phoenix Tube Coupon1” x 1/8 ”

U-Bolt Coupon1 5/8” x 1 ¾”

U-Bolt Coupon1 7/16” x 7/8”

Properties of Wrought Iron

- Nearly Pure Iron- Contains Iron Silicate (Slag) Fibers- Fiber Orientation Affects Strength- Fibers Increase Ductility- Fibers Increase Fatigue Resistance- High Resistance to Corrosion

Chemical Analysis

99.67Fe0.05Si

0.013S0.221P< 0.02Mn< 0.01C

%Element

Tensile Specimens

Material Properties

0

10

20

30

40

50

60

Stre

ss (k

si)

Fu Fy

Wrou

ght Ir

on19

99 - Laci

ng Bar

1999

- FB Web

2002

- FB Web

2002

- FB Flange

Design

Valu

es20

04 –

Eye-ba

r20

04 –

Eye-ba

r

Structural Analysis

30 ft

12 PANELS @ 17'-2 ½" = 206’-6”

15 ft

U02

U11

U03 U10U08U07 U09U05U04 U06

U01

L00 L01 L02 L03 L04 L05 L06 L07 L08 L09 L10 L11 L12

M03M05 M07

M09

Phoenix Tube MembersBuilt-up Members

Baltimore TrussU03 U07 U09U05

L00

U02 U10U08U04 U06

L02 L04 L06 L08 L10 L12

U11U01

L01 L03 L05 L07 L09 L11

M03M05 M07

M09

Analysis ResultsU03 U07 U09U05

L00

U02 U10U08U04 U06

L02 L04 L06 L08 L10 L12

U11U01

L01 L03 L05 L07 L09 L11

M03M05 M07

M09

Members Rated Below H20 Loading

Rehabilitation Scope- Replace Deck, Stringers, & Floorbeams- Strengthen 12 Short Diagonals- Replace 12 Floorbeam Hanger Members - Replace 3 Lateral Struts- Cap & Re-point Abutments- Rehabilitate Exp. Bearings- Install New Railing- Paint Truss

Plan & Elevation

Profile

Diagonal Strengthening

New Floorbeam Hanger Members

Floorbeam Hanger at Phoenix Tubes

Construction

12” +/-