Post-tensioning retard-bonded prestress concrete composite beam and design and construction methods thereof

Abstract

The invention relates to a post-tensioning retard-bonded prestress concrete composite beam and design and construction methods thereof. A layer of top longitudinal bars is arranged at the top of the composite beam, a layer of bottom longitudinal bars is arranged at the bottom of the composite beam; the composite beam is further provided with a plurality of stirrups, a plurality of post-tensioningretard-bonded prestress bars are further arranged on the lower part of the composite beam, and the two ends of the post-tensioning retard-bonded prestress bars extend out of the composite beam and arefixedly provided with anchorage devices and clamps correspondingly. The post-tensioning retard-bonded prestress concrete composite beam adopts a post-tensioning retard-bonded prestress technology, the characteristics that a lower composite structure is high in prefabricating degree and fast and convenient to construct are accorded, and the anti-cracking and anti-bending performance of componentscan also be improved. The post-tensioning prestress can be applied to the post-tensioning retard-bonded prestress concrete composite beam after whole construction, post-tensioning unbounded prestresstendons also have good anti-corrosion performance, thus the post-tensioning retard-bonded prestress concrete composite beam is particularly suitable for structures with the high requirements for deformation control, bearing capacity and weather resistance and with the high-performance requirements for the large span and the heavy load, and the superiority of the fabricated structure can also be reflected 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 and its construction method in a large-span heavy-duty structure that is tensioned after slow bonding. 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 constructio...

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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