Span Length

70′ 82′ 94′ 106′ 118′ 130′ 142′ Span Length BI51 70′ - 110′ BI63 85′ - 130′ BI75 105′ - 140′

Section Properties (gross)

Product NameDepth (in)Area (in2)Yb (in4)Ixx (in4)Iyy (in4)PLF @ 165
BI5151"56625.219144416303650
BI6363"63831.132755116519733
BI7575"71037.150957216735815
image
image
image

Product Information

The Bulb I (BI) girder is a standard variation of the Bulb-T girder. Use the BI shape only when it has benefits over a Bulb-T girder. Since the BI girder have a narrower top flange, it requires less concrete build-up than a Bulb-T. Therefore bridges with high super elevations (generally, greater than 7%) may want to consider the BI girder.

image
image

Standard Design Options

  • Forming and Diaphragm Inserts.
  • Adjust web thickness to accommodate post-tensioning (for spliced girders). For such cases increase the web thickness from 6″ to 7.5″
  • Cast in inserts or hole for diagraph reinforcing
  • Cast in inserts for mounting utility brackets
  • Top flange/web holes for mounting deck forming brackets
image image image
image image

3D Viewer

3D Viewer Tools

 

  • 3D Viewer Functions:
  • Move, Span, Zoom Assemblies
  • Isolate Single Components in View
  • Explode Assembly Single Components
  • Use Markup to Sketch Details
  • General Measurements for Concept
  • Print Views

Need More Info?

We Are Here to Help

 

Have a question, need a budget or detailed schedule?  Knife River sales team is ready to discuss precast solutions for your project.  Reach out to our staff below :

Image's Alex Sari

Alex Sari

Outside Sales Representative

phone

(509) 992-5614

 linkedin

LinkedIn

Image's Eric Holje

Eric Holje

Bridge Estimator

phone

(509) 536-3323

 linkedin

LinkedIn

Product Family

See featured product related to Bulb I assemblies

All Products

AASHTO Girder

AASHTO sections are typically used for railroad, or other private entity, bridge construction when a standard wide flange (WF) girder section does not meet the project design criteria.  The top flange of AASHTO shaped girders is not as wide as standa...

View Product
AASHTO Girder

Box Beam

Box Beams are typically used for 80′-118′ bridge spans. The design allows for a typical 4′ width section to include integral voids which reduce the product weight and are often used when box depth and speed of construction are part ...

View Product
Box Beam

Bridge Substructure

Accelerated Bridge Construction utilizes precast bridge substructure products. Total precast abutments, bent caps, pile caps and wingwalls offer many advantages. They can be precast to precise specifications of the design in a plant controlled settin...

View Product
Bridge Substructure

Voided-Solid Slabs

Voided Slabs are typically used for 15-85′ bridge spans but can be used in building applications where significant design loads are required. Voided slab design allows for a typical 4′ width slab to include integral voids which reduce the...

View Product
Voided-Solid Slabs

Bulb T

The Oregon Bulb-Tee (BT) girder is the preferred choice for most Oregon medium to long span bridges requiring a CIP deck. Bulb Tee precast/prestressed girders are typically used in spans from 60-185′ with significant loading.

View Product
Bulb T

Deck Bulb Tee

Deck Bulb Tee Girders combine a precast deck with the traditional I-Girder design. This design offers the advantage of an immediate driving surface, or alternatively, a roughened surface that allows for the addition of a secondary overlay or a Cast-I...

View Product
Deck Bulb Tee

Tri-Deck

Tri-Deck girders are an adjustable top flange width, multi-stemmed unit designed for full deck use. Tri-Deck bridges are typically used for bridge spans from 30′-52′ which require a longer span and lower profile section. Typically Tri-Dec...

View Product
Tri-Deck

WF Girder

The wide flange (WF) girder is the primary bridge girder section used by Washington State Department of Transportation (WSDOT) and Idaho Transportation Department (ITD). WF Girders are typically used in spans of 70-200’ using sections ranging from 36...

View Product
WF Girder

Projects

Commercial

Industrial

Institutional

Residential

Transportation