MAE CENTER RESEARCH SUCCESS WITH DOTs Past and Future. Neil M. Hawkins - Professor Emeritus University of Illinois MAE Center Annual Meeting - 2002.
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Neil M. Hawkins - Professor Emeritus
University of Illinois
MAE Center Annual Meeting - 2002
With sincere appreciation of the contributions of Professors DeRoches and French (Georgia Tech), Aschheim, LaFave and Long (Illinois), Hwang (Memphis), and personnel from GaDOT, IDOT and TDOT and Caltrans
RESEARCH ACTIVITIES AND SUCCESSES
INTERCONNECTED OPERATIONALY AND PHYSICALLY
Functionality of Components, Time and Cost to Repair.
Interstate 1966 + - 8 years
Overpass 1963 + - 8years
Steel : Concrete
NBI Lacks Information on Bearing, Bent, Foundation, and Soil Characteristics
Interstate Bridge Characteristics Different to Secondary Road
2/3rds Steel Continuous
50% Multi-Col. Pier
90% of Foundations Pile Supported
30% on Soil Likely to Liquefy
Restrainer Cables are used to ensure that bridge beams movements relative to the bearings are restricted and beams cannot displace off bearings longitudinally or transversally.
Over 100 Restrainer Retrofits Modified by TN DOT
bearings: 252 kips
cap beam: 340 kips
cap beam: same
Modified & Wrapped
columns: 220 kips
columns: 360 kips
crashwall: 440 kips
pile cap: 380 kips
pile cap: same
pile group: 450kips
pile group: same
Base shear capacity in terms of pier elements
Case Study Foundations
3 x 10 Retrofitted Pile Group
3x3 Retrofitted Pile Group
- Design All New, and Systematically Upgrade All Existing, Major River Crossings and Their Approaches to AASHTO-LRFD Seismic Criteria.
- Identify Life Safety Needs of Communities and Design and Upgrade Routes Consistent with Those Needs.
- Design Other New Structures, and Upgrade Other Existing Structures, to EQ with 10 % PE in 50 years.
to Successfully Complete That Task.