Assignmnet of HSE Subjects in Professional Engineering Education at University of Indonesia

4. South end of The I-35W Bridge North end of The I-35W Bridge
The I-35W Bridge The 10th Avenue Bridge

6. Long Section

7. Cross Section
(Deck Slab)
Slab Concrete
(t=3,8cm)

8. REALIZATION
ORIGINAL DESIGN

10. Additional Layer
of Concrete
Additional LOAD to
the Steel Structure

11. Central Barrier
Outside Railings
ADDITIONAL
STATIC LOADS:
+ 512,56 kg ≈
+ 6,1 %
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ADDITIONAL STATIC LOADS
(at Construction Process):
+ 262.176,40 kg = 262 tons

12. “Thin” 1,25 cm
Gusset Plates
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Cracks

14. DESIGN 1ST REFUBRISHMENT
The bridge, officially designated
"Bridge 9340", was designed by
Sverdrup & Parcel to 1961 by
standard specifications of AASHTO
(American Association of State
Highway Officials).
• Rennovation &
Reparation of
Structure (1970)
• Start annual
Inspection (1971)
1961
APPROVAL of MDOT
and US DOT*
Two options of design:
• 4-Truss System
• 2-Truss System (cheaper)
MDOT Approved the cheapest
one, using steel of fy 186 MPa
1963
OPERATIONAL
Structure was completed and
open to traffic, during an era
of large-scale projects to
build the Twin Cities freeway
system.
1967
CONSTRUCTION
The construction contracts, worth
in total more than $5.2 million at
the time, were done by HurCon Inc.
and Industrial Construction
Company.
1964
1970-1971
*MDOT = Minessota Departement of Transportation
US DOT = United State Departement of Transportation
DEFECTS
Some of “Gusset’s Plates” have
been corroded
1993
2nd REFUBRISHMENT
1970-1971
• Central Barriers
• Outside Railings

15. DEFECTS
• Cracking was discovered on steel
structure’s plates
• Structure was drilled out &
reinforced
• Monthly Inspection (6 months)
Early
2000’s
3rd REFUBRISHMENT
• Final Rennovation
• Four (4) lanes of road were
closed due to rennovation
2007
COLLAPSE ACCIDENT
The Accident occurred when
stockage of construction material
(sands, aggregates, cements)
placed alongside with heavy
equipments, without concern
July
2007
*MDOT = Minessota Departement of Transportation
US DOT = United State Departement of Transportation
August 1st 2007, 18:05
The Bridge Collapsed

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17. Containment & Control :
• Continuous Maintenance
• Careful Handling of Material
UNSTABLE STRUCTURE
regarding to cracks on
steel plates
Deviation
Cracks on Steel Structures
Initiating Cause
Overload stockage
of material
Steel Structure Collapse
Preventive Safeguards
Structure Re-design & Rework
Loss Event
Structural Defects
(Cracks, etc.)
Mitigative Safeguards
Alternating equipment & sequence of
structure reparation work
Impacts
Safe Reparation Construction
Safely Operating Bridge

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20. Bridge
Collapsed
OR
Fractured
Connections
Fractured
Beam
Fractured
Column / Pier
OR
OR
Overloaded
Structure
Excessive
Equipment
Placement
Excessive
Material
Stockage
AND
Design
Error
Lack of
Mainten-
-ance
Construction
Method Error
Defects of
Structure

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23. Defects of Steel
Structure
Construction
Method Error
Design Error
Potential
Causes
Potential
Outcomes
BEFORE AFTER
Hazard:
Normal Operating Structural-
Defected Bridge
Structural
Failure
Traffic Jam
Human
Casualties