Self-resetting precast concrete beam-column joint device with hidden corbel-variable frictional energy dissipation

Abstract

The invention discloses a self-reposition precast concrete beam column joint device with a dark corbel and a variable friction energy dissipation, including a precast concrete column, a precast concrete beam located on one side of the precast concrete column and a variable friction energy dissipator connected the precast concrete column with the precast concrete beam into a whole. A corbel is arranged on the precast concrete column. The lower side of the precast concrete beam is provided with a notch corresponding to the corbel. The variable friction energy dissipator includes a medium friction steel plate with an undulating surface, an external friction steel plate with the undulating surface and an internal friction steel plate connected with the precast concrete beam on an upper part. The self-reposition precast concrete beam column joint device with the dark corbel and the variable friction energy dissipation can consume energy under an earthquake action, eliminate or reduce the residual deformation of precast reinforced concrete structures under the earthquake action and avoid occurred obvious plastic deformation of main structural members such as precast beams and columns.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a self-resetting prefabricated concrete beam-column node device with hidden corbels and variable frictional energy consumption. Background technique [0002] Earthquakes bring extremely serious disasters to human beings. The traditional seismic design adopts the ductility design method, that is, under the action of an earthquake, some structural components yield and fail in advance, but the overall function will not be lost, and most of the seismic energy is dissipated by the plastic deformation of the components after yielding, so as to achieve The purpose of ensuring the safety of the main structure. Although this traditional design method based on bearing capacity has certain reliability in avoiding building damage and even collapse causing casualties, it cannot effectively control the economic damage caused by earthquakes in moderate or strong earthquakes. After most major ea...

AI Technical Summary

Problems solved by technology

Although the overall initial lateral stiffness of this type of structure is relatively large, there is only a single starting force. Once the energy dissipater yields or friction starts, the gap between the beam-column joints opens, and the lateral stiffness of the structure is mainly provided by the stiffness of the prestressed tendons. Significantly lower stiffness

Under the action of strong earthquakes, the large weakening of the interstory stiffness will easily lead to obvious high-order modal effects in the self-resetting precast concrete structure, and the structural deformation is easy to concentrate, the local floor displacement angle is large, the damage of non-structural components increases, and the seismicity of the structure increases. Posterior reset ability is also affected

On the other hand, if the interstory displacement angle is too large, it will easily lead to the loss of prestress relaxation. For self-resetting precast concrete joints that mainly rely on prestressed friction shear at the beam-column interface, their shear bearing capacity will be greatly affected; shear resistance, the shear capacity of self-resetting precast concrete joints will be greatly reduced due to the yield of the angle steel

Moreover, for self-resetting precast concrete frames with large spans, the friction force at the beam-column connection interface alone is not enough to resist beam end shear force and vertical gravity load

At the same time, during the construction stage, the lack of temporary vertical support for precast concrete beams will also affect the efficiency of on-site assembly

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