Pre-tensioning prestressed composite beam structural system and construction method thereof

Abstract

The invention relates to a pre-tensioning prestressed composite beam structural system and a construction method of the pre-tensioning prestressed composite beam structural system. Lower longitudinal reinforcements are bound and lapped on lower longitudinal prestress wires in composite frame beam prefabricated components; the lower longitudinal reinforcements are inserted into frame pillars; second pre-buried steel plates are buried in the lower end portions of the composite frame beam prefabricated components; lower portion longitudinal prestress wires are buried in the composite frame beam prefabricated components; secondary beam longitudinal reinforcements are lapped and bound on the lower portion longitudinal prestress wires; the second pre-buried steel plates are welded with the secondary beam longitudinal reinforcements; first pre-buried steel plates opposite to the second pre-buried steel plates are arranged on the composite frame beam prefabricated components; pitch point steel plates are respectively welded on the first pre-buried steel plates and the second pre-buried steel plates; and the pitch point steel plates are connected through bolts, which enables the composite frame beam prefabricated components to connect with composite secondary beam prefabricated components. Wires and longitudinal reinforcements are lapped to use in the pre-tensioning prestressed composite beam structural system, and therefore the connecting mode of the pre-tensioning prestressed composite beam structural system is scientific and reasonable, and quality is safe and reliable.

Description

technical field [0001] The invention relates to a building prefabricated component and a construction method thereof, in particular to a pretensioned prestressed composite beam structure system and a construction method thereof, belonging to the technical field of civil engineering. Background technique [0002] The pretensioned prestressed composite beam using steel strands as the lower longitudinal prestressed reinforcement has the advantages of large beam span, small beam height, and less steel consumption. It is applied to prefabricated prestressed concrete assembly integral frame structures. more. [0003] However, the pretensioned prestressed laminated beam structure using steel strands as the lower longitudinal prestressed reinforcement has the following problems at the frame beam-column joints, frame beams and secondary beam joints: [0004] 1. Frame beam-column joints [0005] First of all, although the strength of the steel strand is high, its deformation ability...

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Problems solved by technology

As mentioned above, there are two anchoring methods for steel strands at the lower part of the secondary beam, as well as the currently commonly used method of embedding an overhanging channel steel at the upper part of the secondary beam end or making a protruding concrete protrusion, and resting on the prefabricated component of the frame composite beam. The node connection method on the top surface, because the anchoring effect of the steel strands at the lower part of the beam is not ideal, and the laminated layer of the cast-in-place of the secondary beam is thin, the bonding effect of the cast-in-place concrete at the node part and the surface of the prefabricated part is not ideal, so for the sake of safety , in the current "Technical Regulations for Prefabricated Prestressed Concrete Assembled Integral Frame Structures", the secondary beam support formed at the joint between the frame beam and the secondary beam is set as a hinged connection

[0010] When the secondary beam support is set to be hinged to the secondary beam force calculation, it will cause the amount of reinforced steel bars in the lower part of the secondary beam to increase by more than 2 times compared with the consolidation state of the support. At the same time, in accordance with the requirements of the current "Code for Design of Concrete Structures", the support of the secondary beam is actually partially restrained, so it is also necessary to place an additional reinforcement on the upper part of the secondary beam that is no less than 1 / 4 of the amount of steel bars in the middle and lower parts of the secondary beam span. Leading to a substantial increase in the amount of secondary beam reinforcement

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