Fabricated self-resetting prestressed concrete frame double-energy-consumption joint

Abstract

The invention relates to an assembly type self-resetting prestressed concrete frame double-energy-dissipation joint which is connected with a prefabricated reinforced concrete column and a prefabricated reinforced concrete beam and comprises a column end pre-buried steel base plate, a friction energy dissipation unit, a beam end pre-buried steel sleeve and a staged metal yield type mild steel damper arranged in the beam end pre-buried steel sleeve. The column end pre-embedded steel base plate is arranged on the side face of the prefabricated reinforced concrete column, one end of the beam end pre-embedded steel sleeve is connected with the column end pre-embedded steel base plate, the other end of the beam end pre-embedded steel sleeve is connected with the prefabricated reinforced concrete beam, one side face of the friction energy dissipation unit is connected with the beam end pre-embedded steel sleeve, and the other side face of the friction energy dissipation unit is connected with the beam end pre-embedded steel sleeve. The other side face of the friction energy dissipation unit is connected with the column end embedded steel base plate. Compared with the prior art, the device is clear in stress, simple in structure and convenient to construct and has a two-stage energy consumption starting mechanism.

Description

technical field [0001] The invention relates to the technical field of prefabricated structures, in particular to an assembled self-resetting prestressed concrete frame double energy dissipation node. Background technique [0002] Building industrialization and seismic design based on functional recoverability are inevitable trends in the development of my country's construction industry. Earthquake damage at home and abroad shows that the main reason for the collapse of prefabricated concrete frame structures is the destruction of beam-column joints. The joint space is small, the steel bars are intricate and easy to collide, the sleeve grouting is not dense, the prefabrication assembly rate is low, there is often large structural damage and residual deformation after the earthquake, and the repair cost is too high or difficult to repair. The self-resetting concrete frame structure realizes the assembly of prefabricated beam and column members through unbonded prestressed ten...

AI Technical Summary

Problems solved by technology

[0003] The self-resetting prestressed concrete frame structure in the prior art improves the energy dissipation performance of the joints by setting appropriate energy dissipation parts, but there are the following problems: if the energy dissipation reinforcement is concentrated at the beam end, it will lead to stress concentration, and the joints Construction and later replacement are inconvenient; the use of prestressed beam-column energy-dissipating joints with external friction plates requires high component flatness, and the welding workload on the construction site is relatively large

[0004] Existing node energy dissipators can be divided into frictional energy dissipators and metal yield energy dissipators by type. There are self-resetting prestressed concrete frame beam-column nodes, and there is only a single starting force. Although the self-resetting concrete frame structure The initial lateral stiffness of the structure is relatively large, but once the friction energy dissipator or metal yield energy dissipator set at the beam-column joints is activated and the gap between the beam-column joints is opened, the lateral stiffness of the structure is only provided by the stiffness of the prestressed tendons. Therefore, the stiffness of the frame structure is significantly reduced, resulting in the obvious insufficient bearing capacity of the self-resetting structure under large earthquakes

In addition, due to the weakening of the interstory stiffness of the structure under a large earthquake, the local structural deformation is easy to concentrate, the local floor displacement angle becomes larger, and the damage of non-structural components increases, resulting in the post-earthquake reset ability of the self-resetting concrete frame structure.

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