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Bridge Engineering
Lusher Charter School
November 4, 2016
Dave Kanger, P.E. / Stacey Carr, P.E.
Associates
Modjeski and Masters, Inc.
So… What is a Bridge? bridge(noun):
A bridge is a structure carrying a road, path, railroad, or canal across
a river, ravine, road, railroad or other obstacle.
So… What is (also) a Bridge? bridge(noun):
A bridge can also be a time, place, or means of connection or
transition.
So…What is Engineering? engineering (noun):
The branch of science and technology concerned with
the design, building, and use of engines, machines, and
structures.
• The work done by, or the occupation of, an engineer.
• The action of working artfully and professionally to bring
something about.
So…What is Bridge Engineering?
The field of science and technology applied to the design and
construction of a structure carrying a road, path, railroad,
or canal across a river, ravine, road, railroad or other obstacle.
So…What is (also) Bridge
Engineering?
If a bridge can also simply be a means of connection, then bridge
engineering is also a recognition of the history of human
civilization as a story of travel and transportation.
So…What is (also) Bridge
Engineering?
The building of crossings in the form of bridges has always been a
measure of technological development of a people.
So…How do Bridges and
Bridge Engineering Work?
1. Need
2. Location
3. Material
4. Analysis / Design
5. Construction
Need The need could be driven by many different sources.
• New demands: development or planned development of
an area or migration of people and goods which require
transportation
• Changing demands: existing conditions good for
yesterday no longer meet what is necessary today or
tomorrow.
Need
Map of Rock Island, IL, 1889 (H. Wellge)
Map of Rock Island, IL
2016 (Bing)
Location The location could be driven by many different sources.
• Population density
• Favorable site conditions for the structure
• Vicinity of other alternate routes
Location
Material In our application of science and technology, we use many
different kinds of materials.
We need to understand the behavior of everything that
goes into the completed structure.
Material
Material • Concrete
• Steel
• Timber
• Steel Wire / Cable
• Connections
– High-strength Bolts
– Rivets
– Welding
• Exotic materials
– Bearings
– Collision protection
Material
Huey P. Long Bridge Widening
“We work with
steel...”
Material
Huey P. Long Bridge Widening
“...Concrete...”
“...and even both together.”
Analysis and Design “...We deal with people.”
“...but also have
homework to do.”
Construction
Huey P. Long Bridge Widening
“Do you understand
how things go together...
...In complex ways?”
Bridge Engineering (also) is...
About Solutions
Whatever structure we design and will get built needs to
take into account the diverse elements which will
impose demands on it.
• Vulnerability to earthquakes
• Vessel collisions
• Scour
• High Winds...
• ...and unfortunately, acts of terrorism...
• ...or other problems...
Bridge Engineering (also) is...
About Solutions
...Man-eating Lions!
Bridge Engineering (also) is...
Part of Larger Civil Engineering Field We apply the practice of several specific fields of
engineering including:
• Structual Engineering
• Geotechnical Engineering
• Traffic and Transportation Engineering
Along with...
• Economics
• Law
• Public Policy
• Culture/Aesthetics
Dragon Bridge (Vietnamese: Cầu Rồng) is a bridge over
the River Han at Da Nang, Vietnam
Why Civil Engineering? “Civil engineers make civilization possible.”
http://www.asce.org/People-and-
Projects/Projects/Projects/
Why Would You Choose Bridge
Engineering?
So What’s the Bottom Line? Stability: When things are good, people build. When times are tough, the
public looks to “shovel ready” and other large-scale public works projects.
Job Security: The interstate highway system began construction in 1956.
Much of our nation’s infrastructure is approaching its original design life.
There is a need to extend what we have, and build or rebuild new.
ASCE’s 2013 Infrastucture Report Card received a “D+” average! There is a
need and it’s growing. (www.infrastructurereportcard.org/ )
Personal Satisfaction: If you want to help build great things that everyone
sees, helps entire communities, cities, regions, states, or even countries, then
this is your profession.
Job Security http://www.infrastructurereportcard.org/
The Future
(Source: http://www.infrastructurereportcard.org)
So What’s (Really) the Bottom Line? Income. . . First a quick word about the typical measurements you might find.
Median: The numerical value separating the higher half of a sample from the
lower half. The middle number in a sorted list. Ex:
1, 2, 3, 4, 5: The median is “3.”
2, 4, 5, 7, 9: The median is “5.”
2, 2, 2, 3, 4, 5, 100: The median is “3.”
Average: Also known as “arithmetic mean,” this is the middle value of a
data set. Does not necessarily need to exist within the sample. Ex:
1, 2, 3, 4, 5: The average is (1+2+3+4+5)/5 = “3.”
2, 4, 5, 7, 9: The average is (2+4+5+7+9)/5 = “5.4.”
2, 2, 2, 3, 4, 5, 100: The average is (2+2+2+3+4+5+100)/7 = “16.9.”
So What’s REALLY the Bottom Line? Income (www.mtu.edu, payscale.com, www.census.gov, and www.online.wsj.com): “Year after year, engineering tops the list of (undergraduate) majors with the
highest starting salary!”
Starting, Profession, Avg. Top 10% Unemployment,
Median Median in Profession (2010)
Civil: $53,100 $77,990 $119,620 3.9%
Mechanical: $58,400 $79,320 $119,950 4.2%
Chemical: $64,500 $92,390 $146,650 2.2%
Electrical: $61,300 $85,920 $131,660 5.4%
Biomedical: $53,800 $84,670 $134,150 not tracked
Individual College Grads $43,143 (2003 census)
N’tl Household Income $45,018 (2003 census)
N’tl Unemployment 9.6% (2010)
The bottom line is really this:
“Our work is rewarding. It is satisfying to see our projects complete.
Our profession is the story of hard work being rewarded.”
American Society of Civil Engineers’
“New Faces of Engineering,” 2016
http://www.asce.org/new_faces_of_civil_en
gineering_collegiate_edition/
“ASCE’s New Faces of Civil
Engineering recognition
programs highlight the next
generation of civil engineering
leaders. By showcasing young,
diverse, talented engineers the
program shows that
engineering is an exciting
profession open to everyone.”
We need more engineers...
You can be next.
Any Questions?