Anti-seismic prestressed precast beam

Abstract

The invention relates to an anti-seismic prestressed precast beam. The anti-seismic prestressed precast beam comprises a beam body, a prestressed steel stranded wire which is buried in the beam body as a main bar, a stirrup and an additional bar, and is characterized in that the stirrup extends out of the upper surface of the beam body by a certain length, the part of the steel stranded wire is sheathed with a sleeve with a certain length at the end part of the beam body, the sleeve is buried in the end part of the beam body, the additional bar is buried in the lower part of the end part of the beam body, and the additional bar extends out of the end part of the beam body for the certain length. The U-shaped additional anti-cracking steel bar is buried at the end of the beam, and the steel bar has good anchoring performance in the beam and can effectively control the width of a crack at the root part of the beam; and simultaneously, the energy-consuming capability at the end of the beam is improved, so that the anti-seismic performance problem of the prestressed beam can be thoroughly solved.

Description

technical field [0001] The invention relates to a building prefabricated component, in particular to a pretensioned prestressed prefabricated beam used for a laminated floor. Background technique [0002] The prestressed composite beams in the new prefabricated cast-in-place structural system, although the steel consumption is reduced, have poor ductility of the steel strands at the bottom of the frame beam and the prestressed concrete at the beam end and the composite beam under the action of negative bending moment, the lower part of the beam will be compressed. The problem of stress superposition makes the ductility of the plastic hinge area worse, and it will be brittle. The prestressed beam disclosed by the applicant in the previous patent uses a steel strand sleeve at the end of the beam, and the method of releasing the prestress by the casing solves the above. However, under the action of positive bending moment at the beam end, the cracks at the beam root appear earl...

AI Technical Summary

Problems solved by technology

[0002] The prestressed composite beams in the new prefabricated cast-in-place structural system, although the steel consumption is reduced, have poor ductility of the steel strands at the bottom of the frame beam and the prestressed concrete at the beam end and the composite beam under the action of negative bending moment, the lower part of the beam will be compressed. The problem of stress superposition makes the ductility of the plastic hinge area worse, and it will be brittle. The prestressed beam disclosed by the applicant in the previous patent uses a steel strand sleeve at the end of the beam, and the method of releasing the prestress by the casing solves the above. However, under the action of positive bending moment at the beam end, the cracks at the beam root appear early and the crack width is too large, and the energy consumption of plastic hinges is poor. solve the above problems

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