bridge 101 general session · pdf fileprestressed bridges or bridge ... integral abutments...
TRANSCRIPT
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Bridge College
BRIDGE 101
General Session
Bridge Types
&
Nomenclature
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Overview
Definition of a Bridge & Minor Span
Who owns/maintains the bridges
Who inspects the bridges
Bridge types & nomenclature
What to look for
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Breakout Sessions
Bridge Preservation Techniques
Bearings and Beam Ends
Reinforcing Steel
Wearing Surface Maintenance
Bridge Rail
Bridge Joints
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The hardest thing in life to learn
is which bridge to cross and
which to burn.
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What is a Bridge?
Federal definition – A structure that provides
passage on a public way that is 20 feet in span
or longer measured along the centerline.
State definition – A structure that provides
passage on a public way that is 10 feet or
greater in span measured along the centerline.
Structures 10 feet to less than 20 feet are
referred to as minor spans while structures 20
feet or greater are referred to as bridges.
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SPAN
Centerline Roadway
Skew
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Who Owns and Maintains these
Bridges?
MaineDOT owns and maintains all bridges and minor spans on state and state aide highways.
MaineDOT owns and maintains all bridges on the local network that are not Low Use or Redundant Bridges (LURB). Check with the Region Management staff if you’re not sure of ownership.
These bridges will require you to travel on local roadways that you normally wouldn’t travel.
Municipalities own and maintain all minor spans and LURBs on the local system.
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Bridges & Minor Spans
Region Number %
Deck
Area
Million SF
%
1 565 20.7 3.81 31.3
2 572 21.0 3.06 25.0
3 630 23.0 1.43 11.8
4 624 22.9 2.58 21.2
5 338 12.4 1.30 10.7
Total 2729 12.18
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Total Bridges & Minor Spans
2395 Conventional Bridges
334 Metal Pipes
11 Ferry Transfer Bridges
8 Movable Bridges
9 Covered Bridges
2 Suspension Bridges
220 Railroad Bridges
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Bridges and Structures
Maintenance Division
Who are they?
What do they do?
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John Buxton, P.E.
Bridge Maintenance Engineer
Ben Foster, P.E.
Asst Bridge Maint Eng
Jeff Naum
Supt of Operations
Bill Doukas, P.E.
Sr Structural Engineer
Engineering Support
Brent Snowden, P.E.
Sr Structural Engineer
Structures Management
Bridge Inspection
Scott Harris
Steve Harris
Tim Merrithew
Pete DeRocher
Jamie Hannum
Vacant
Gina Pelletier
Trans Planning Spec
Engineering Admin Asst
Vacant
Pat Kertes
Kevin McLaggan
Asst Structures Manager
Vacant
Carl Edwards
Dive Manger
Region Managers
Region
Superintendents
Transp Oper Mgrs
Bridge Scott Gray
Buildings Manager
Dwight Moody
Crew Supervisor
Richard Latno
Crew
Bridges and Structures Maintenance Division
Inspection Engineering
Operations
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Bridges and Structures
Maintenance
Inspect
Evaluate
Rate
Evaluate overloads
Load test
Document
Management
Work with
municipalities
Structural design
Falsework design
Field inspections
Post & close bridges
Evaluate accident
damage
Develop Work Plan
Participants in Bridge
Community
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What does MaineDOT inspect?
All minor spans and bridges on public
ways are inspected by MaineDOT and the
data for bridges only is submitted to the
Federal Highway Administration annually.
The Maine Turnpike Authority inspects
their own bridges but MaineDOT submits
the data to FHWA.
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Bridge Inspection Program
6 Bridge inspectors statewide
2300± bridge inspections per year
Generally bridges are inspected every 24
months
Some bridges are inspected more
frequently due in general to poor condition
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MaineDOT Dive Team
140 underwater bridge inspections per
year
6-8 Underwater grout projects
Underwater inspections of ferry terminals
Underwater construction inspection
Environmental surveys
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No Snappers!
No Snappers!
Please
No Snappers!
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Diving is Cool
No its not…
its cold!
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We Need Your Eyes
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Call the Office!
OOOPS
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For
Sale
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Bridge Numbers
All bridges and minor spans have
a unique 4 digit number
You must use all four digits
0456 = Yes 456 = No
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Bridge Number
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Dead Bridge Number
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What are the different types of
bridges?
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Minor Spans - General
Metal Circular pipes
Metal multiplate pipe arches
Metal plate arches on footings
Concrete boxes
Precast concrete frames
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Circular Aluminum Pipe
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Galvanized Steel Pipe
Normal high flow
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Steel Pipe
Holes
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Concrete Invert
The bottom pates
are the first to deteriorate
Concrete
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Upstream Plates Folded
It will soon be reclassified as a dam
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Aluminum Multiplate Pipe Arch
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Aluminum Box
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Hey…That doesn’t look right!
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$200,000 Later
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Plate Arch on Concrete Footings
Concrete Footings
Steel Plate Arch
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Plate Arch on Concrete Footing
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Precast Frame/Arch
Headwall
Wingwall
Barrel
Precast Concrete is:
Concrete components which are cast and partly matured in a
factory or on the site before being lifted into their final position on a structure.
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Pier Cap
Pier Footing
Basic Bridge Anatomy Bridge Rail
Bridge Curb Wearing Surface
Waterproofing
Membrane
Deck
Beams or
Stringers
Fascia
Diaphragm Flange Web
Bearings
Pier Columns
Supers
tructu
re
Su
bstr
uctu
re
(under bituminous)
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Superstructure
Clear Span Abutment Abutment
Every Bridge will have two and only two abutments
Superstructure
Abutment Abutment Pier
Single Span
A Multispan bridge may have one or many piers
Multispan Bridge
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Multispan Bridges
Simple Spans
(Two rows of bearings on a pier)
Continuous Spans
(One row of bearings on a pier)
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Bridge Superstructures
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Concrete Superstructures
Direct span concrete slab
Concrete rigid frames
Concrete arches
Precast prestressed voided slabs
Precast prestressed butted box beams
Precast segmental box beams
Precast AASHTO Bulb-T
Concrete T-Beams
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Buried Slab-No Curb
Overfill
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Buried Slab
This is what happens
Spalling: the word used for concrete that is chipping, flaking, or scaling damage along its surface.
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This is More Like It
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Efflorescence
Leaky Slab
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Arched Concrete Slab
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Concrete Rigid Frame
Breastwall
Slab Haunch
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Slab
Rigid Frame
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Filled Concrete Arch
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Concrete T-Beam
Grouted Granite Abutment
Concrete Cap T-Beam Stems
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Concrete T-Beam
Stem
Deck
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Spall at Bridge Drain
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What is prestressed concrete?
Concrete reinforced by either pretensioning or
posttensioning, allowing it to carry a greater load or span a
greater distance than ordinary reinforced concrete. In
pretensioning, lengths of steel wire or cables are laid in the
empty mold and stretched. The concrete is placed and
allowed to set, and the cables are released, placing the
concrete into compression as the steel shrinks back to its
original length. In posttensioning, the steel in the concrete
is stretched after the curing process. Prestressing places a
concrete member in compression; these compressive stresses
counteract the tensile bending stresses of an applied load.
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Precast Prestressed Bridges
Rule #1
Do not ever cut into any precast prestressed bridges or bridge elements without consulting a bridge engineer….evah!
Rule #2
If you don’t follow Rule #1 there is no need for Rule #2
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Voided Slabs
Longitudinal Joint
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Voids
* * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * *
Voided Slab
Tensioning Strands
3’ to 4’
Shear Key
(Stressed to 29,000 lbs)
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Cracks at Slab Joints
Longitudinal Cracks
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* * * * * * * * * * * * * * *
* * * * * * * * * *
Void
Voided Box Beam
Tensioning Strands
3’ to 4’
Shear Key
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Butted Precast Box Beam
Butted Boxes
Longitudinal Joint
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Prestressed Spread Box Beam
Box Beam
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Segmental Concrete Box
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Inside Segmental Box
Segment Joint
Utility Conduit External Post Tensioning Ducts
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Double Cell Segmental Box
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Precast Bulb-T
Girders
Diaphragms
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Steel Superstructures
Multi-beam I-beam or girder
Thru girder
Thru Truss
Deck Truss
Pony Truss
Arches
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Built up Steel Girder
Riveted Girder
Unidentified Sea Creature
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Riveted Steel Girder
Cross Frame
Lateral Wind Bracing
Web Stiffeners
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Weathering Steel Girder
Welded Girders
Cross Frames
Precast Deck Panel
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Rolled Beam Stringer
Bolted Field Splice
Steel Cover Plate
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Steel Thru Girder
Thru Girders
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Steel Thru Girder
Floor Beam
Floor Beam
Thru Girder
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Thru Girder
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Multipurpose Bridge
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Basic Truss
Top Chord (Compression)
Bottom Chord ( Tension)
Vertical Diagonal
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Portal
Deck
Truss Members
Floor Beam Stringers
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Thru Truss
Portal
Generally the lowest point of underclearance
Portal
Generally Lowest Point of Underclearance
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Truss Floor System
Stringers
Floor Beam
Diagonal Bracing Bottom Chord of Truss
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Gusset Plate Top Chord
Top Chord
Gusset Plate
Lattice
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Gusset Plate Bottom Chord
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Gusset Plate Bottom Chord
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Houston, We Have a Problem
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The Iron Boot
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Gusset Plate
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Deck Truss
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Timber Superstructures
Sawn timber beam
Glulam timber beam
Covered Bridges
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Sawn Timber
Piles
Cap
Cross Bracing
Beams
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Timber Glulaminated Beam
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Timber Glulaminated Beam
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Covered Bridges
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Bridge Decks
Cast-in-Place Concrete
Precast Concrete
Timber
Open Steel Grid
Concrete Filled Steel Grid
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Concrete Deck
Cast-in-Place Concrete Deck
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Delaminated Concrete Deck
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Delamination Removal
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Blocking Margin Failure
Blocking Margin
Look Here
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o o o o o o o
Wearing Surface
Slab
Steel Stringer
Blocking
Reinforcing Steel
Blocking Margin
Crack Crack
Look Up
See Any Cracks?
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Precast Deck Panes
Precast Deck Panel
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Transverse Glulam Timber Decking
Transverse Timber Decking
Rolled Steel Beams
Bridge Seat
Diaphragms
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Sawn Timber Deck
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Open Steel Grid Decking
Open Grid Decking
Steel Plate Patches
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Wearing Surfaces
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Bridge Wearing Surfaces
Integral Concrete
Separate Concrete
Bituminous and Waterproofing
Membrane
Timber Running Planks
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Concrete Wearing Surfaces
Provide smooth but noisy riding surface
Protects the deck from chloride intrusion by being a sacrificial layer
Will provide structural integrity to a deck that is in marginal condition
Will last 30-40 years depending on location and use
Should be treated occasionally to extend life
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Alligator Cracking
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Deck Prepared for Concrete Wearing Surface
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Vibratory Screed
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Concrete Wearing Surface
Tine Marks
Maine Rail
Bridge Connection
(Michigan Shoe)
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Deck Thickness
Separate Concrete
Wearing Surface
Integral Concrete
Wearing Surface
3” 1”
Two Placements One Placement
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 2” 2”
Top Mat
Reinforcing Steel
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Bituminous Wearing Surfaces
Provide very smooth riding surface
Are permeable so a membrane must be
applied to the top of the deck
Normally are installed at 3 inches
Should be milled and filled 1½ inches after
15 years
Should be replaced along with membrane
after 30 years.
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Bituminous Wearing Surface
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Distressed Wearing Surface
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Bridge Substructures
Every bridge will have an abutment at
each end
Piers are intermediate supports
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Abutments
Mass concrete
Full height cantilevered
Integral
Capped Stone
Stub
MSE Walls
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Footing
3
12
1
12
Toe Heel
Backwall
Bridge Seat
Breastwall
Mass Abutment
Batter
Batter
Footing May Be Pile Supported
or be a Spread Footing
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Mass Abutments
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Undermined Pile Supported
Abutment
Steel Pile
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Undermined Abutment w/ Exposed
Timber Piles
Timber Pile
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Grout Bags and Grout Tube
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Grouted Abutment
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Footing
Backwall
Bridge Seat
Breastwall
Toe Heel
Cantilevered Abutment
Footing May Be Pile Supported
or be a Spread Footing
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Integral Abutments
Blocking Margin
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Integral Abutment
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Integral Abutment
Steel Beam
Deck
Steel Pile
Rip Rap
Steel Plate
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Widened Stone Abutment
Weep Holes
Concrete Cap
Mass Wings
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Piers
Solid shaft pier
Column and cap
Hammerhead pier
Pile Bents
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Mass Piers
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Cracked Pier
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Post Tensioned Rehabilitation “The Doughnut”
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Concrete Column and Cap
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Southerly End
Failed Joint Seal Above
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Pier Rehabilitation
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Hammerhead Pier
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Pile Bent Pier
Concrete Cap
Circular Steel Pipe Piles
Plumb Pile Battered Pile
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Jacketed H-Pile Pier Bent
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Rehabilitated Jackets
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Stone Piers Capped with Concrete
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Substructure Undermining
SCOUR – More to Come
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Bridge Washing
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Plugged Drain
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Spalled Concrete – Southerly Face
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Salt Brine
23.5% Chlorides
Most Corrosive 4.5%
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Steel Rusts!!!!
Its our job to protect it!
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Bearing Needing Your Help
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Plated & Painted
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Bridge Joints
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Finger Joint
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Misaligned Finger Joint
Deck Side
Backwall Side
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Failed Compression Seal
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Compression Seal Installation
Wrestling the Anaconda
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No Header on Deck Side
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New Headers
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Plow Damaged Bridge Rail Post
Don’t Do This!
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Vehicle Impact
I see a quarter!
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Impact Damage
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Cracked I-Beam
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Beam Separated from Deck
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Impact Damage
Beam Sweep
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Impact Damage
Birds Mouth
Grind to make smooth
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Traffic Control
Move the Vehicles Over to the Next
Beam
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Ready to Reach New Heights?