Post-tensioned slow bonded prestressed concrete composite beam and its design and construction method

Abstract

The invention relates to a prestressed concrete composite beam with post-tensioning and slow bonding and its design and construction method. The top of the composite beam is provided with a layer of top longitudinal reinforcement, and the bottom is provided with a layer of bottom longitudinal reinforcement; it also has several stirrups A number of post-tensioned slow bonded prestressed tendons are also arranged at the lower part of the composite beam, and the two ends of the composite beam protrude out of the composite beam and are respectively fixed with anchors and clamps. The composite beam adopts post-tensioning slow bonded prestressing technology, which not only inherits the characteristics of high prefabrication and convenient construction of the lower composite structure, but also improves the crack resistance and bending resistance of the components. Because post-tensioning prestressing can be applied after the overall construction and post-tensioning slow bonded prestressing tendons have good anti-corrosion properties, it is especially suitable for large-span and heavy-duty structures that require high deformation control, bearing capacity and weather resistance. In the structure with high performance requirements such as loading, it can also reflect the superiority of the assembled structure while meeting the design requirements.

Description

technical field

[0001] The invention relates to the technical field of civil engineering design, in particular to a multi-stage tensioned prestressed concrete composite beam in a long-span heavy-duty structure that adopts slow bonding and then tensioning, and its design and construction methods. Background technique

[0002] In recent years, with the improvement of my country's construction technology, the corresponding construction level has also become higher and higher. There are new concepts and requirements in terms of architectural beauty, architectural quality, construction efficiency, green, low-carbon and energy-saving buildings, etc. However, the labor cost of manpower and the environmental impact control requirements during the construction process will also increase, which will not be a small test for the improvement of the construction level. The industrialization of construction has attracted more and more attention because its integrated production mode of de...

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