Novel self-resetting energy dissipation support based on large-strain FRP

Abstract

The invention discloses a self-resetting energy dissipation support based on large-strain FRP. The self-resetting energy dissipation support comprises a friction energy dissipation system and a self-resetting system, the friction energy dissipation system is composed of an upper outer sleeve, a lower outer sleeve, a first wedge-shaped inner core, a second wedge-shaped inner core, a left end plate and a right end plate, the two wedge-shaped inner cores are located in the upper outer sleeve and the lower outer sleeve and are tightly attached to the upper outer sleeve and the lower outer sleeve, the left end of the first wedge-shaped inner core and the right end of the second wedge-shaped inner core stretch out of the outer sleeves to be connected to the left end plate and the right end plate correspondingly, the self-resetting system is composed of FRP strips or integrally-wrapped FRP and upper and lower outer sleeves, the FRP is large-strain FRP, when the strip FRP mode is adopted, the FRP strips are evenly distributed on the two sides of the upper and lower outer sleeves, in addition, the upper ends of the FRP strips are tightly connected to the top end of the upper outer sleeve, and the lower ends of the FRP strips are tightly connected to the bottom end of the lower outer sleeve. when the integrally-wrapped FRP mode is adopted, the FRP is completely wrapped around the upper outer sleeve and the lower outer sleeve, the upper end of the FRP is tightly connected to the top end of the upper outer sleeve, and the lower end of the FRP is tightly connected to the bottom end of the lower outer sleeve. The support has good practicability, energy dissipation capacity and self-resetting capacity.

Description

technical field [0001] The invention belongs to the technical field of energy dissipation and shock absorption in structural engineering, and in particular relates to a novel self-resetting energy dissipation support based on large-strain FRP. Background technique [0002] The existence of residual deformation of the bridge structure after the earthquake will seriously reduce the ability of the structure itself to resist aftershocks, and increase the cost of reinforcement and maintenance of the bridge structure after the earthquake, and even need to be demolished and rebuilt, resulting in huge economic losses. In order to reduce the residual displacement of structures after earthquakes, scholars have proposed different types of self-resetting energy-dissipating supports. The system consumes the input energy of the earthquake through the energy dissipation device to protect the safety of the main structure, and at the same time provides the self-restoring force through the ad...

AI Technical Summary

Problems solved by technology

However, SMA is expensive. After the strain exceeds 8%, there will be stress strengthening, plastic displacement reduction and stiffness reduction. It is easily affected by temperature, and the energy dissipation capacity of SMA decreases with the increase of loading frequency.

However, there are many spring components and the installation is complicated

However, the self-resetting support mostly uses a single set of pre-compressed disc springs to provide the restoring force, which cannot fully utilize the axial deformation capacity of the disc springs, and the process of pre-compressing the disc springs requires the use of large-scale loading equipment, which has high requirements for the installation environment.

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