FDOT Structures and Bridges 2 — Questions and Answers
Question 1: What does the FDOT suffix 'NBI' refer to in bridge management?
- New Bridge Inspection
- National Bridge Inventory (Correct answer)
- Nominal Bridge Index
- Network Bridge Integration
Correct answer: National Bridge Inventory
NBI stands for the National Bridge Inventory, the federal database of bridge inspection data that all state DOTs must report to for bridges on public roads.
Question 2: What type of pile is most commonly used for FDOT bridge foundation construction in Florida's coastal and offshore conditions?
- Steel H-pile
- Timber pile
- Prestressed concrete square pile (Correct answer)
- Drilled shaft only
Correct answer: Prestressed concrete square pile
Prestressed concrete square piles are the most commonly used FDOT bridge foundation element, providing corrosion resistance in Florida's aggressive coastal environments.
Question 3: According to FDOT bridge inspection standards, what is the required maximum interval between routine bridge inspections?
- 1 year
- 2 years (Correct answer)
- 4 years
- 5 years
Correct answer: 2 years
Federal NBIS requirements, adopted by FDOT, mandate a maximum 2-year interval between routine bridge safety inspections.
Question 4: What FDOT bridge condition rating of '4' indicates?
- Excellent condition — like new
- Good condition — minor problems
- Fair condition — some minor deterioration (Correct answer)
- Poor condition — advanced deterioration
Correct answer: Fair condition — some minor deterioration
An NBI bridge condition rating of 4 (Fair) indicates some minor deterioration of primary structural elements but the bridge remains serviceable.
Question 5: What is the primary purpose of a drilled shaft (drilled pier) foundation in FDOT bridge construction?
- Support light loads on shallow stable soils
- Transfer heavy loads through weak soils to competent bearing material or by skin friction (Correct answer)
- Anchor temporary construction falsework only
- Provide lateral resistance only, not vertical load capacity
Correct answer: Transfer heavy loads through weak soils to competent bearing material or by skin friction
Drilled shafts transfer heavy structural loads through weak or compressible soils to competent bedrock or dense sand layers below, or develop load capacity through skin friction.
Question 6: What does FDOT's 'Structures Work Program' database track?
- Employee work hours on bridge projects
- Inventory, inspection data, and maintenance needs for state bridges (Correct answer)
- Material specifications for bridge construction
- Traffic volumes on bridge structures
Correct answer: Inventory, inspection data, and maintenance needs for state bridges
The FDOT Structures Work Program tracks bridge inventory, inspection results, condition ratings, and maintenance/rehabilitation needs for programming future work.
FDOT Structures and Bridges 2
What does the FDOT suffix 'NBI' refer to in bridge management?