national bridge practice
TRANSCRIPT
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NATIONAL BRIDGE PRACTICE
Innovation Opportunities in Transportation Structures
Zoli
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Philosophy - Engineering & Innovation
Innovation does not proceed through
major breakthroughs by specific
individuals, but rather through the
collaboration of different people who,
through small and cumulative
improvements, yield novel and useful
artifacts over time
- George Basalla,
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Agenda
Philosophical Underpinnings
Innovation Opportunities
– Enhanced Safety
– Enhanced Efficiency
– Enhanced Speed
Barriers to Innovation
– Internal (HNTB)
– External (Client based)
Implementation Strategies
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Philosophy – Innovation & Vulnerability
Sociologist Brene Brown:
“Vulnerability is the
birthplace of innovation,
creativity and change”
Vulnerability is necessary
for courage and is not
weakness.
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Philosophy – Innovation & Mindfulness
Psychologist Ellen Langer:
“Mindlessness is the
application of yesterdays
solutions to todays
problems”
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Evolving Clients
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Design Paradigms Evolving Public Needs
1880's - 1930's
Cost
Safety
Longevity
Speed1980’s -present
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Lessons from Recent Failures – Long Span Bridges & Extreme Events
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Lessons from Recent Failures Texas Transportation Institute 1966-2005
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Vehicular Impact – No Code Provisions
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Hydrocarbon Fire & Bridge Damage
Malfunction Junction, Birmingham AL
January 5, 2002 & October 21, 2004
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Lessons From Failures - VBIED’s
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Prestressed Concrete Beams & Abrupt Collapse
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Innovation for Safety – Network Arches
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Fractured
Web
Fractured
Flange
PL 1 3/4
PL 1
1/8
4'-0"
7'-0
"
Innovation for Safety – Network Arches
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X
Y
Z
Moment Z
Load HALF
FEET-KIP
VAL 4.170E+04
LOC 2.049E+00
X
Y
Z
Moment Z
Load HALF
FEET-KIP
VAL 3.222E+04
LOC 1.046E+00
VAL 2.188E+04
LOC 1.492E+0021,900 kip-ft
32,200 kip-ft
41,700 kip-ft
23,800 kip-ft
Innovation for Safety – Network Arches
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X
Y
Z
Moment Z
Load HALF
FEET-KIP
VAL 5.644E+03
LOC 1.150E+01
VAL 6.004E+03
LOC 8.852E-01
X
Y
Z
Moment Z
Load HALF
FEET-KIP
VAL 3.897E+03
LOC 1.255E+01
VAL 6.207E+03
LOC 1.846E+00
Bending Moments With Network Hangers
6,000 kip-ft
5,600 kip ft
6,200 kip-ft
3,900 kip-ft
Innovation for Safety – Network Arches
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Network Arch - Arch Rib Dynamic Response
-2500
-2000
-1500
-1000
-500
0
500
1000
1500
2000
2500
4 104 204 304 404 504 604 704 804
Distance
Str
on
g A
xis
Be
nd
ing
1 Cable Mz 2 Cables Mz 3 Cables Mz
Innovation for Safety – Network Arches
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Design Paradigms Evolving Costs
1900's
Materials
Fabrication
Transportation
Erection
2000's
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Memorial Bridge Replacement
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Memorial Bridge Replacement
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Fabrication Process – Nesting Diagrams
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Memorial Bridge Replacement
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Memorial Bridge Replacement
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Memorial Bridge Replacement
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Memorial Bridge Replacement
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Barriers – Internal to HNTB
Forced (Stacked) Ranking
– Only 5% of High Performing Corporations as of 2011
– Negates Creativity / Risk Taking
– Reduces Teamwork (Employees don’t want to share ideas)
– Weakens Ethics of Corporate Culture
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Barriers – Internal to HNTB
SSA
– Does the SSA create sufficient
opportunities for innovation?
– How about brand?
– What is the right mix of
projects?
– What about new clients / one
time clients?
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Brand & Market Share
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Bridge Name Original Budget As Bid Cost Redesign
Bob Kerrey $ 23 M $ 47 M $ 19 M
Mary Avenue $ 6.0 M $12.6 M $7.3 M
Happy Hollow $ 3.5 M $ 7.3 M $3.5 M
Pedestrian Bridges – Ideal Opportunities for Innovation & Brand
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Barriers – Internal to HNTB
Risk Management
– Does innovation create risk
implicitly?
– Innovate to reduce risk?
– Enhanced Safety
Enhanced Inspectability
Enhanced Repairability
Ease of Fabrication,
Transportation, Erection
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External Barriers to Innovation
Codes
– Section Design
– Not System focused
– Reliability Inconsistencies
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External Barriers to Innovation
Inadequate Knowledge
– Fabrication
– Transportation
– Erection
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External Barriers to Innovation
Procurement Methods &
Prescriptiveness
– Design Bid Build
– CMGC
– Design Build
– P3
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Implementation Issues?
Where can we make progress?
– Internal / External Barriers
– How to engage?
Which Projects
– By Size, Type, Procurement Method?
Which owners/clients?
– DOT’s, Toll Authorities, Contractors?
What should we do about brand?
– Is there a client shift?
– Is brand more important than ever?