What are the disadvantages of continuous multiple-span deck over simply supported multiple-span deck?

Continuous multiple-span decks and simply supported multiple-span decks both have advantages and disadvantages depending on the specific context of their use. Here are some potential disadvantages of continuous multiple-span decks compared to simply supported multiple-span decks:

Construction complexity: Continuous multiple-span decks require more complex construction than simply supported decks. They require longer spans of steel or concrete and the use of intermediate supports, which can be more challenging and costly to construct.

Maintenance: Continuous decks have more components, such as expansion joints, bearings, and intermediate supports, that require maintenance and can be prone to wear and tear over time. This means that maintenance costs for continuous decks may be higher than for simply supported decks.

Structural stability: Continuous decks are generally more stable than simply supported decks because they distribute loads more evenly across their spans. However, they can also be more vulnerable to sudden failure if one of the intermediate supports fails, which can lead to catastrophic collapse.

Cost: Continuous decks can be more expensive to construct than simply supported decks, especially for longer spans. The cost of materials, labor, and equipment can be higher due to the additional construction complexity.

Limited flexibility: Continuous decks are less flexible than simply supported decks, which can be a disadvantage in some situations. For example, if the alignment of the bridge needs to be adjusted, a continuous deck may require more extensive modifications than a simply supported deck.

Environmental impact: The construction of continuous decks can have a greater environmental impact than simply supported decks due to the larger amount of materials and energy required for their construction.

Overall, the choice between continuous and simply supported multiple-span decks depends on a variety of factors, including the specific application, budget, construction timeline, and environmental considerations.