Self-resetting concrete-filled square steel tubular column base joint with friction type anchoring device

Abstract

The invention discloses a self-resetting concrete-filled square steel tubular column base joint with a friction type anchoring device. The self-resetting concrete-filled square steel tubular column base joint comprises a concrete-filled square steel tubular column, a concrete foundation, energy dissipation devices, prestressed tendons and the anchoring device of the prestressed tendons. The energydissipation devices are symmetrically arranged on the two sides of the concrete-filled square steel tubular column, and the prestressed tendons are symmetrically arranged on the other two sides of the concrete-filled square steel tubular column. The anchoring device comprises a first T-shaped plate, stiffening ribs and a first connecting shaft. Compared with an existing anchoring mode that self-resetting column foot prestressed tendons are completely fixed, the anchoring device can achieve friction anchoring, and within the designed lateral displacement range, the anchoring mode and the completely-fixed anchoring mode are consistent in effect; and when the lateral displacement of the structure exceeds a design value, the anchoring device slides, the internal force of the prestressed tendons is kept at a constant value, the problem that the bearing capacity is suddenly reduced after the prestressed tendons are suddenly broken or yielded is solved, and the ductility of the joint is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of earthquake prevention and disaster reduction of building structures, and in particular relates to a self-resetting square steel pipe concrete column base node with a frictional anchoring device. Background technique [0002] As a form of realization of recoverable functional structure, the self-resetting structure introduces a reset component that can provide structural restoring force on the basis of swaying energy consumption, so as to reduce or even eliminate the residual deformation of the structure after the earthquake, and then make it rapidly Restore functionality. Introducing the concept of self-resetting at joints is one of the most typical forms of self-resetting structures. Compared with the more mature self-resetting beam-column joints, the research on self-resetting column-foot joints has attracted extensive attention from researchers in recent years. [0003] As the "ultimate terminal" of t...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a self-resetting square concrete-filled steel tube column foot joint with a frictional anchoring device, which solves the problem that in the existing self-resetting column foot joints, the prestressed reinforcement adopts a completely fixed anchorage way, the prestressed tendon may yield or break when subjected to a large earthquake beyond the design expectation

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