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Questions and Answers
According to AASHTO, what is the minimum opening height for a structure to be considered a bridge?
According to AASHTO, what is the minimum opening height for a structure to be considered a bridge?
6100 mm
What is the definition of a bridge?
What is the definition of a bridge?
A structure built to span physical obstacles such as bodies of water, valleys, and roads.
What is one key reason a bridge is a vital element in a transportation system?
What is one key reason a bridge is a vital element in a transportation system?
What happens if a bridge fails?
What happens if a bridge fails?
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The cost per mile for a bridge is __________ compared to approach roadways.
The cost per mile for a bridge is __________ compared to approach roadways.
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What is a major concern when designing bridges?
What is a major concern when designing bridges?
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What field of engineering deals with the planning, design, and maintenance of bridges?
What field of engineering deals with the planning, design, and maintenance of bridges?
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Match the following types of spans with their classifications:
Match the following types of spans with their classifications:
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Which of the following is NOT a type of bridge classification based on materials?
Which of the following is NOT a type of bridge classification based on materials?
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Study Notes
Bridge Definition and Purpose
- A bridge spans physical obstacles like water, valleys, and roads.
- AASHTO defines a bridge as any structure with an opening of at least 6100mm that is part of or located over/under a highway.
- Bridges provide essential passage over obstacles and are critical components of transportation systems.
Importance in Transportation Systems
- Bridges control traffic capacity by managing volume and weight.
- Insufficient carriage width leads to traffic flow restrictions.
- Strength deficiencies can prevent bridges from carrying heavy loads, which necessitates rerouting.
- The cost of bridge construction is substantial compared to approach roadways, requiring careful planning.
Failure Implications
- Bridge failures can paralyze transportation systems, making alternative routes ineffective.
- Detours may increase travel time and fuel expenses.
- Normalcy in transportation is restored only after fixing or replacing the bridge.
Key Considerations in Bridge Design
- Balancing future traffic handling capabilities, load demands, and the cost of heavier and wider structures is vital.
- Strength is the primary concern, and measures should be in place to mitigate deterioration.
Structural Characteristics and Concerns
- Bridges are exposed to various conditions, including temperature fluctuations and durability challenges.
- They endure large, repetitive loads, leading to fatigue, which can cause structural cracking.
Bridge Engineering Overview
- Bridge engineering encompasses surveying, planning, design, analysis, construction, management, and maintenance.
- Engineers are responsible for ensuring designs meet safety and serviceability standards.
Civil Engineering Disciplines Involved
- Surveying and mapping aid in layout and grading.
- Highway design focuses on alignment for efficient traffic flow.
- Structural design covers the superstructure and substructure components.
- Geotechnical engineering ensures sturdy foundations for supports.
- Hydraulic engineering concerns itself with span length and site drainage.
Classifications of Bridges
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Based on Span Length:
- Short Span
- Medium Span
- Long Span
- Culvert Bridge
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Based on Structural Form:
- Arch
- Truss
- Beam/Girder
- Slab
- Suspension
- Cable-Stayed
Additional Classifications
-
Based on Purpose/Use:
- Highway
- Railroad
- Pedestrian
- Pipeline
- Aqueducts
-
Based on Deck Location:
- Deck Bridge
- Through Bridge
- Half Through Bridge
-
Based on Geometry:
- Straight
- Skewed
- Curved
-
Based on Movable Features:
- Bascule
- Swing
- Lift
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Description
Test your knowledge on the definition, purpose, and importance of bridges in transportation systems. Explore the implications of bridge failure and the key considerations for their construction. This quiz will help solidify your understanding of how bridges function and their critical role in managing traffic.
