Which joints are most commonly used in bridges for accommodating movement?

• A. Bridge expansion joints
• B. Small movement joints
• C. Medium movement joints
• D. Rubber joints

Answer: (A)

Movement in bridges mainly comes from temperature changes and the resulting expansion and contraction of the deck, along with some displacement from traffic and wind. To prevent cracks and undue stresses, the deck is separated into parts that can slide relative to each other. Expansion joints are designed to absorb these potentially large longitudinal movements, allowing the deck sections to slide apart or together while keeping water out and drainage present. This makes them the standard solution for accommodating movement on most bridges, especially longer spans. Smaller, localized joints or rubber-based joints don’t provide the same range of movement or long-term durability for the whole bridge deck, so they aren’t used as the primary means to handle the typical movement of bridges.