Which term refers to a joint that allows very large movements consisting of multiple strip or compression seals?

• A. Masonry Plate
• B. Nail Laminated
• C. Military Loading
• D. Modular Joint

Answer: (D)

Expansion joints for bridges are chosen by how much movement they must accommodate. When very large movements are required, a modular joint is used. It is made up of a series of modular elements that fit into a track, with seals between the modules. As the deck expands or contracts, the modules slide within their frames, while multiple strip seals or compression seals between the modules maintain a watertight barrier. This modular setup can be extended by adding more modules to handle greater displacement, which is why it’s suited for long spans with large movement demands. The other terms refer to different concepts (construction methods or loading conditions) and do not describe a joint system for large movements.