Post-tensioning unbonded co-tensioning prestressed concrete composite beam and design and construction methods thereof

Abstract

The invention relates to a post-tensioning unbonded co-tensioning prestressed concrete composite beam and design and construction methods thereof. The post-tensioning unbonded co-tensioning prestressed concrete composite beam is a novel prestressed composite beam for applying bonded and unbonded prestress to a precast beam and the composite beam in stages by adopting a pre-tensioning method and apost-tensioning method in order to meet the construction and use demands. Compared with a traditional prestressed composite beam, the post-tensioning unbonded prestressed technology is adopted in thepost-tensioning unbonded co-tensioning prestressed concrete composite beam, the characteristics of high prefabricated degree, convenient and fast construction and the like of a lower composite structure are upheld, the unique advantages are also possessed, thus the anti-crack and anti-bending properties of a member can be improved, the structure demands at different stages are met through batchedtensioning, the integrity and the anti-seismic property of the structure can be enhanced by cooperating with the design of fabricated integrated prestress joint connection, thus the post-tensioning unbonded co-tensioning prestressed concrete composite beam is especially suitable for structures which have the high-property requirements such as the large span and the heavy load and have the high requirements for deformation control, and bearing capacity, and the superiority of the fabricated structure can also be embodied while the design requirements are met.

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 adopting unbonded post-tensioning in a large-span heavy-duty structure and a construction method thereof. 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 construc...

AI Technical Summary

Problems solved by technology

Among them, the pretensioning construction technology can ensure the effective bonding force between the prestressed tendons and the concrete, and the construction is simple, but it is only suitable for the industrial production of small and medium-sized components.

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