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EAS 140Engineering Solutions
Lecture #25
Civil Engineering:
Might As Well Be Civil About It
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EAS 140: Engineering Solutions
Announcements – C Tues. 11/20: Lecture – Ethics and
Professionalism
Mon. 11/26: In-class lab quizzes start– on Excel material since last quiz and
Maple
Tues. 11/27: Lecture - Ethics Case Study Presented– Ethics case study materials on the
web by Friday 11/16
Thurs. 11/29: Civil Eng. Dept.– Power case study due
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EAS 140: Engineering Solutions
Announcements – C Tues. 12/4: In-Class Ethics Case
Study
Thurs. 12/6: Lecture - Lessons from Failure and Course Review– In-lab quiz for Thursday labs
Mon. 12/10: Final Examination– Will make sample questions
available after Thanksgiving– Will emphasize material from lecture
and case studies; no computing from lab
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EAS 140: Engineering Solutions
Assignments
Readings in Jensen:
Ethics: Chapters 15-17
Civil: section 4.5
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EAS 140: Engineering Solutions
Civil Engineering - Overview
World’s Oldest (Engineering) Profession– Everything was military and civil
Most Diverse? You Betcha!– UB: Civil, Structural and
Environmental Engineering
Most Satisfying?– Build it and see it
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EAS 140: Engineering Solutions
Civil Engineering - Disciplines
Structural Engineering– Design: Buildings, bridges– Old: Don’t fall down– New: Earthquakes, tall buildings
Geotechnical Engineering– Design: Foundations, earthen works– Old: Support the load– New: Landfills, liquefaction
Construction Management Engineering– Design: People, $$, materials– Old: Scheduling, economics– New: Web-based inspection
Environmental Engineering– Design: Treatment, remediation– Old: Drinking water, wastewater– New: New pollutants, brownfields
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EAS 140: Engineering Solutions
Structural Engineering
Molding materials we don’t understand into shapes we can’t analyze so as to understand forces we can’t assess in such a way that the public does not suspect our ignorance (safety factor)
Primary Tool: Force Balance– Newton’s Third Law of Motion: For
each force, there is an equal and opposite balancing force
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EAS 140: Engineering Solutions
Structural Engineering - Example
Overturning moment– Overturning moment = (area)
(force/area)(moment arm) = (1450 ft x 178 ft)(60 lb/ft2)(725 ft) = 5.6 million ton-ft
Resisting moment– Resisting moment = force x moment
arm = 150,000 tons x 84 ft = 12.6 million ton-ft
But… soil must be strong!
1450 ft
150-225 ftSears
Tower
60 lb/ft2
150,000 tons
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EAS 140: Engineering Solutions
Geotechnical Engineering
Where structures and environment interact
Primary Tool: Force Balance
Example: Sand Pile– How moist should sand be to
make the steepest pile of sand?
angle of repose
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EAS 140: Engineering Solutions
Geotechnical Engineering - Example
Do Force Balance
Shear strength = frictional forces + cohesive forces
Effect of water– No water: angle = 30-37o
– Some water: angle = big!– Lots of water = liquefaction
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EAS 140: Engineering Solutions
Construction Management Eng.
One Tool: Critical Path Method Example: Foundation
Tasks– Place sideforms– Pour foundation– Excavate– Order, receive sideforms– Order, receive rebar– Place rebar
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EAS 140: Engineering Solutions
Construction Management Eng.
Dig
Order
rebar
Order
forms
Lay
forms
Lay
rebar
Pour
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EAS 140: Engineering Solutions
Environmental Engineering
Design engineered systems and analyze natural systems
Primary Tools: Mass, Momentum, and Energy Balances– Mass: Where do pollutants go?
How well did we remove them?– Momentum: How do water and air
flow?– Energy: Chemical and mechanical
thermodynamics
Example: Urban Water Cycle– What is the water cycle?
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EAS 140: Engineering Solutions
Environmental Engineering
drinking watertreatment plant
wastewatertreatment plant
Urban Water Cycle
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EAS 140: Engineering Solutions
Environmental Engineering
DWTP
WWTP
DWTP
WWTP
DWTP
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EAS 140: Engineering Solutions
Civil Engineering - Employment
Many jobs231,000 (expected in 2006)
over 90% employed within one year
Civils work as civilshighest percentage working in field
among engineers
Good job growthincrease by 18% (1996-2006)
82,000 new jobs (1996-2006)
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EAS 140: Engineering Solutions
Civil Engineering - Employment
Government (46%)state (22%), local (15%), federal (9%)
Consulting (37%)highest among engineers
become licensed
Construction (7%)
Other (10%)manufacturing, utilities, mining
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EAS 140: Engineering Solutions
Civil Engineering Profession - Employment
Salary (1995)starting: $32,000
average: $62,500
long-term salary: ownership
Job satisfaction5/100 best job based on salary,
prestige, growth, security (source: Money)
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EAS 140: Engineering Solutions
Civil Engineering Curriculum Overall philosophy
grounded in mechanics
reflects the breadth of civil
Design and practiceinternship, Eng. Career Institute
Track approachConstruction engineering and
management
Environmental engineering
Geoenvironmental and foundation engineering
Structural engineering
15 technical electives
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EAS 140: Engineering Solutions
Civil Engineering Curriculum
Two degrees offeredBSCE (Civil. Eng.)
Follow track or generalBSEE (Env. Eng.)
Less structural engineeringMore sciences - especially biology,
geology, engineering chemistry
BS in structural eng. - coming
Dual degreesBA or BS in CS/BS in civil – 4.5 yearsBS/MEng – 5 years, get both degreesBS/MBA – 5 years
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EAS 140: Engineering Solutions
Civil Engineering Curriculum
Freshman yearthe usual
also: “Great Ideas”, graphics
Sophomore yearstatics
dynamics
solid mechanics
also: C++, probability and statistics
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EAS 140: Engineering Solutions
Civil Engineering Curriculum
Junior yearstructures I and IIfluid mechanicssoil mechanicsenvironmental engineeringmaterialsgeodesylabs
Senior yeartransportationfoundationsplanning and managementalso: technical electives
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EAS 140: Engineering Solutions
Other Fun Stuff
Contests and clubssteel bridge
concrete canoe
hazardous waste
other: Predator model
Other organizationsASCE, SWE
Faculty-student interactionsclubs
research
classroom: teaching excellence
