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A bridge with a ramen design has a continuous superstructure and substructure that are rigidly attached. The structure is typically cast as a one piece, making it continuous from the deck to the base. Members are joined together by stiff connections that transmit shear, axial, and bending forces. Although a bridge design with a rigid frame can have major structural advantages, it can also be challenging to design and/or build. Ramen bridges were first used in Germany, and they swiftly migrated to the Americas. Particularly Emlio Henrique Baumgart and Arthur G. Hayden were well-known for their usage of concrete rigid frames.
At the period, reinforced concrete was frequently employed in the construction of bridges. However, the superstructure was built with the substructure in mind. There are no bearings in the concrete ramen design. Instead, the superstructure and substructure were cast together as a single piece, resulting in a continuous bridge from deck to footing.
This kind of design has proven useful to engineers for a variety of reasons. Moments at the centre of a ramen bridge’s deck are less than equivalent moments in a deck that is only simply supported. As a result, a mid-span cross section that is substantially shallower can be employed. Less room is needed for the approaches, and no structural elements are required where the deck bears on the abutments.
These are further advantages. Rigid Ramen bridges have some drawbacks, according to engineers. Concrete making and placing are both challenging, as is the placement of steel reinforcing bars (rebars). Furthermore, rigid frames are more difficult to analyse than merely supported structures since they are statically indeterminate.
The Global Ramen Bridge market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
In China, continuous reinforced concrete Ramen bridges have developed quickly in recent years. The planning and building of these kinds of bridges has advanced greatly. In order to better understand these recent advancements in bridge design and construction, it is helpful to highlight some experiences. Continuous reinforced concrete Ramen bridges constructed in China were assessed for this purpose.
Certain design factors of highway bridges and railway bridges, such as the span-to-height ratio between girder height and span length, the slab thickness, and the concrete strength, were examined due to the differing design loads. The findings offer some direction for continuous Ramen bridge design and research.
