Post-tensioned bonded co-tensioned prestressed concrete composite beam and design and construction method thereof

Abstract

The invention relates to a post-tensioned bonded co-tensioned prestressed concrete composite beam and a design and construction method thereof. The composite beam is a novel prestressed composite beamwhich applies bonded prestress to a prefabricated beam and the composite beam by adopting a pretensioning method and a post-tensioning method in stages in order to meet construction and use requirements. Compared with a traditional prestressed composite beam, post-tensioned bonded prestressed technology is adopted, the characteristics of the lower composite structure such as high prefabrication and fabricating degree and convenient construction are inherited, unique advantages are achieved, the crack resistance and bending resistance of elements can be improved, the structural requirements ofdifferent stages are met by batch tensioning, and the integrity and seismic resistance of the structure can be enhanced by matching with the design of fabricated integral prestressed joint connection. The post-tensioned bonded co-tensioned prestressed concrete composite beam is especially suitable for structures with high performance requirements such as large span and heavy load which require high deformation control and bearing capacity, and can further embody the advantages of the fabricated 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 construction method of a multi-stage tensioned prestressed concrete composite beam with bonded and then tensioned in a large-span heavy-duty structure. 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 design and construction can mee...

AI Technical Summary

Problems solved by technology

The bonded prestressed structure was proposed earlier, and it has matured so far. Although it is not as good as the mechanical properties of the bonded prestressed structure, its construction performance is better and its quality is relatively more reliable.

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