FDOT Structures and Bridges 1 — Questions and Answers
Question 1: What FDOT document provides design criteria and load requirements for bridge structures in Florida?
- FDOT Drainage Manual
- FDOT Structures Design Guidelines (SDG) (Correct answer)
- FDOT Standard Specifications Section 450
- AASHTO LRFD only — no FDOT supplement
Correct answer: FDOT Structures Design Guidelines (SDG)
The FDOT Structures Design Guidelines (SDG) supplements AASHTO LRFD specifications with Florida-specific requirements for bridge design.
Question 2: What type of prestressed concrete beam is most commonly used in FDOT bridge construction?
- T-beam
- Box beam
- Florida I-beam (FIB) (Correct answer)
- Bulb-T beam
Correct answer: Florida I-beam (FIB)
The Florida I-Beam (FIB) is FDOT's standard prestressed concrete beam, developed specifically to address Florida's long span and durability requirements.
Question 3: According to FDOT specifications, what is the minimum distance from the edge of bridge deck to the centerline of exterior railing post?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
FDOT standards require the centerline of exterior railing posts to be positioned a minimum of 12 inches from the edge of the bridge deck.
Question 4: What FDOT inspection program is responsible for periodic bridge safety inspections on Florida's highway system?
- FDOT Maintenance Rating Program
- FDOT Bridge Safety Inspection Program (BSIP) (Correct answer)
- FDOT Structure Inventory and Appraisal (SI&A)
- National Bridge Inspection Standards (NBIS) only
Correct answer: FDOT Bridge Safety Inspection Program (BSIP)
The FDOT Bridge Safety Inspection Program (BSIP) conducts periodic inspections of all state highway bridges to ensure structural safety and serviceability.
Question 5: What is the standard maximum span length for FDOT Type III Florida I-Beam (FIB) girders?
- 80 feet
- 100 feet (Correct answer)
- 120 feet
- 145 feet
Correct answer: 100 feet
The FDOT Type III Florida I-Beam has a maximum practical span of approximately 100 feet, making it suitable for mid-range bridge spans.
Question 6: What is the function of expansion joints in FDOT bridge design?
- Connect adjacent bridge spans structurally
- Accommodate thermal movement and prevent deck cracking (Correct answer)
- Drain stormwater from the bridge deck
- Mark the boundary between bridge and approach fill
Correct answer: Accommodate thermal movement and prevent deck cracking
Expansion joints accommodate thermal expansion and contraction of bridge structures, preventing stress buildup that would crack or damage the deck and structure.
FDOT Structures and Bridges 1
What FDOT document provides design criteria and load requirements for bridge structures in Florida?