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Questions and Answers
What is the main role of bridge bearings?
What is the main role of bridge bearings?
- Transferring forces between the bridge superstructure and substructure (correct)
- Supporting traffic loads only
- Controlling temperature changes
- Preventing lateral loads
Which of the following is a cause of movements in bridge bearings?
Which of the following is a cause of movements in bridge bearings?
- Shrinkage and creep (correct)
- Bridge vibration
- Bridge settlement
- Substructure wear
What is the function of roller bearings in bridge structures?
What is the function of roller bearings in bridge structures?
- To control traffic loads
- To accommodate translational movements (correct)
- To support high loads only
- To prevent deformation in superstructure
What type of bearing permits rotational movement while preventing longitudinal movement?
What type of bearing permits rotational movement while preventing longitudinal movement?
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How do recent bridge bearings act during earthquakes?
How do recent bridge bearings act during earthquakes?
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Study Notes
Main Role of Bridge Bearings
- Bridge bearings provide support for the superstructure, allowing for load transfer from the bridge deck to its foundation.
- They accommodate thermal expansion, contraction, and other movements, ensuring the bridge remains stable and safe.
Causes of Movements in Bridge Bearings
- Temperature changes can lead to expansion or contraction of materials, causing movements.
- Vehicle traffic and dynamic loads create vibrations, affecting the position of the bearings.
- Ground movement from seismic activity also contributes to shifts in the bearings.
Function of Roller Bearings in Bridge Structures
- Roller bearings facilitate horizontal movement while supporting vertical loads.
- They reduce friction during lateral displacement, enhancing the overall efficiency of the bridge’s movement.
Type of Bearing Permitting Rotational Movement
- Spherical bearings allow for rotational movement while restricting longitudinal movements, ensuring stability during various load conditions.
Behavior of Recent Bridge Bearings During Earthquakes
- Modern bridge bearings, such as seismic isolation bearings, can absorb and dissipate energy during seismic events, reducing the forces transmitted to the superstructure.
- They enable controlled movements that help maintain the structural integrity of the bridge during earthquakes.
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