Constructor - March/April 2018 - 33

CELEBRATE AGC'S
CENTENNIAL AND
SHARE YOUR STORY 
This year, AGC celebrates
100 years as the leading
association for the
construction industry.
To commemorate this
momentous occasion, AGC
has created a centennial
website where members
can learn about the
association's rich history,
share their own stories,
register for upcoming
events, and much more.

Photo courtesy of McHugh Construction

worked overnight and installation of the
center pylon was meticulously planned
to keep vehicle and freight traffic flowing
throughout construction.
"Thanks to advances in materials,
we're able to build bridges in places we
couldn't in decades past," says del Val
Cura. "Suspension cables, post-tension,
cable-stayed designs allow us to build
longer structures that permit more usable
space under the structures. Additionally,
the increasing availability of cost-efficient precast materials are helping us
meet tighter deadlines and minimize
disruption, which wasn't a possibility
in the past."
Skanska's Fullington, who counts precast bridges among his specialties, would
certainly agree. And while his present
project, the Pensacola Bay Bridge, isn't
employing segmental technology to the
deck, much of its substructure is precast
- the cones, the footings and the caps.
The three-mile bridge, with roughly
one mile of approach roadway on each
side, connects the mainland Florida city
of Pensacola with a bedroom community
known as Gulf Breeze.
"The existing bridge had lost its load
rating," Fullington explains, which necessitated a precursor project. "Part of our
contract for this job was to strengthen the
existing bridge with carbon fiber repairs
to keep it in service throughout the duration of our project."
@Constr uctor Ma g

Four lanes of traffic, two each way,
with very small shoulders will soon
become six lanes, three in each direction with 10- to 12-foot shoulders.
"Much better capacity and room for
breakdowns to get vehicles off the road
without impeding traffic."
The challenge here, he laughs, "...
is how do you build a bridge out in the
middle of the bay? At the center of the
bridge you're a mile and a half from land
in either direction. How do you get concrete from land to the middle of the bridge
in a timely manner so you can place it
before it hardens?"
Technology (and super-cool giant
marine cranes) to the rescue.
"You could make it out on the water,
but really this is where the idea to use
prefab pieces really came together ...
you're not having to deal with placing
large quantities of concrete out in the
middle of the bridge because the pieces
are already built and you're putting
them together off-site, then lifting them
into place."
Just like enormous Legos.
Aside from precast, Fullington says
that advances in concrete have bumped
bridge construction evolution light years
up the ladder.
"What I've seen in just 18 years is
incredible," he notes. "Today's projects
are using much higher strength concrete.
Back when I left school, a 6000-PSI was

Visit the interactive site
at centennial.agc.org. 

considered high strength. That would
be considered a medium these days.
Now, we're producing concrete for
bridges that are 9-, 10-, 11,000-PSI -
but lighter. And that opens the door for
longer spans, more slender and elegant
lines."
St. John, whose company's massive
Ohio River projects were larger in scope
than any others recently undertaken in
the Louisville, Kentucky, area, says the
engineering models required for jobs
such as these have grown more complex.
"These models include time-dependent models to determine and predict
stresses during each and every phase
from day one through many years after
the bridge opens, and also service-life
models to ensure that the structures
serve the public for many years."
The Walsh Group's two bridges,
Downtown Crossing and East End
Crossing, "were designed to have service
lives of 100 years," he says, noting that
even newer ones are modeling for 150.
And that's not only nice for area commuters, but means these bridges - and
other AGC-borne spans just like them,
will still be relevant come the association's next centennial.
◆

MA R C H / A P R I L 2 0 1 8 | www.constructormagazine.com 33


http://centennial.agc.org http://www.constructormagazine.com

Table of Contents for the Digital Edition of Constructor - March/April 2018

Editor’s Note
President’s Message
CEO’s Letter
Focused on the Future
Simonson Says
2018 Construction Outlook: Positive but Workforce Challenges Persist
Span Cycles
Chapter Connection
Technology Toolbox
Legislative and Regulatory News
Member and Chapter News
Products & Services Marketplace
Index to Advertisers
Constructor - March/April 2018 - intro
Constructor - March/April 2018 - cover1
Constructor - March/April 2018 - cover2
Constructor - March/April 2018 - 3
Constructor - March/April 2018 - 4
Constructor - March/April 2018 - 5
Constructor - March/April 2018 - 6
Constructor - March/April 2018 - Editor’s Note
Constructor - March/April 2018 - 8
Constructor - March/April 2018 - President’s Message
Constructor - March/April 2018 - 10
Constructor - March/April 2018 - CEO’s Letter
Constructor - March/April 2018 - Focused on the Future
Constructor - March/April 2018 - 13
Constructor - March/April 2018 - 14
Constructor - March/April 2018 - 15
Constructor - March/April 2018 - 16
Constructor - March/April 2018 - 17
Constructor - March/April 2018 - 18
Constructor - March/April 2018 - Simonson Says
Constructor - March/April 2018 - 20
Constructor - March/April 2018 - 2018 Construction Outlook: Positive but Workforce Challenges Persist
Constructor - March/April 2018 - 22
Constructor - March/April 2018 - 23
Constructor - March/April 2018 - 24
Constructor - March/April 2018 - 25
Constructor - March/April 2018 - 26
Constructor - March/April 2018 - 27
Constructor - March/April 2018 - 28
Constructor - March/April 2018 - Span Cycles
Constructor - March/April 2018 - 30
Constructor - March/April 2018 - 31
Constructor - March/April 2018 - 32
Constructor - March/April 2018 - 33
Constructor - March/April 2018 - 34
Constructor - March/April 2018 - Chapter Connection
Constructor - March/April 2018 - 36
Constructor - March/April 2018 - Technology Toolbox
Constructor - March/April 2018 - 38
Constructor - March/April 2018 - Legislative and Regulatory News
Constructor - March/April 2018 - 40
Constructor - March/April 2018 - 41
Constructor - March/April 2018 - 42
Constructor - March/April 2018 - Member and Chapter News
Constructor - March/April 2018 - 44
Constructor - March/April 2018 - Products & Services Marketplace
Constructor - March/April 2018 - 46
Constructor - March/April 2018 - 47
Constructor - March/April 2018 - 48
Constructor - March/April 2018 - Index to Advertisers
Constructor - March/April 2018 - 50
Constructor - March/April 2018 - cover3
Constructor - March/April 2018 - cover4
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