over the Deer Creek Reservoir Spillway Stark County, Ohio

Owner is the Stark County Park District

Subcontractor to Stevens-Painton, Corp.

Contract Documents by ms consultants

Design/Build/FabricatorUS Bridge’s Longest Single Span

Span = 248 ft. c/c of bearingsWidth = 14 ft. rail/railBow string arch truss (Pratt type,

with a curved or arching top chord)18 PanelsProfile grade vertical curvature

7” Concrete Deck Slab Pedestrian Live Load = 65 psfVehicular Live Load = H15 Truck Wind Pressure = 75 psf

AASHTO Standard Specifications for Highway Bridges 17th Edition, 2002

Load Factor Design (LFD) MethodAASHTO Guide Specifications for

Design of Pedestrian Bridges, 1997

H15 (15 T)(6k front axle, 24k rear axle)

Agency design vehicle

wped = the greater of:

85 psf ∙(0.25+(15/√A1))or

65 psf

Guide Specification Section 1.2.1.1

ASTM A709 Gr. 50W which means A588 Gr. 50 (weathering)

Painted Hand Railing & Bridge Ends Stay-in-Place (SIP) forms Future Wearing Surface of 20 psf Laminated Elastomeric Expansion Joints Strip Seal Expansion Joint Shippable Units – 8 field sections per truss

Hand computations Computer analysis of gravity loads using

Truss Analysis Rating Program (TRAP) by University of Maryland’s BEST Center

Top chord stability analysis using Excel Spreadsheet or by hand (for the sections without sway bracing)

Other Excel Spreadsheets for bolted or welded connections

Floor Beam Design

Floor Beam Design

Truss Analysis

Truss Analysis

Truss Analysis

Truss Analysis

Truss Analysis

Truss Analysis

Deflections affect fabricated geometry

DDL=7.25” Dead Load DeflectionMVC = 18.75” Vertical Curve Offset

U.S. Bridge in Cambridge, OH

U.S. Bridge in Cambridge, OH

Profile Processing

Plate Processing

Cleaning (Shot Blasting)

Layout & Cutting

Laydown

Shop Assembly

Shop Assembly

Finish (Sand Blasting)

Finish (Paint)

Delivery

Thank you!