End unbonded reinforced concrete column and preparation method

Abstract

The invention discloses a reinforced concrete column with non-adhesive ends and a preparation method thereof. All longitudinal reinforcing bars in plastic hinge regions at both ends of the column are respectively sheathed by a steel strip corrugated pipe of which the length is twice of the height of the column section, and a 914 adhesive is utilized to attach foam gaskets to the two ends of the corrugated pipe, so that the foam gaskets and the bars in the region form a closed integral body; and thus, a non-adhesive section with a certain length is formed between the longitudinal bar at partial ends and the concrete. The bar strain distribution at the non-adhesive section of the column ends can be uniform, and a yield section with synchronous and slow stress increase is formed, thereby postponing and even preventing the buckling fracture and resilience degeneration, effectively enhancing the ductility and energy consumption capacity of the column end plastic hinge regions, and obviously improving the damage of the concrete in the region due to binding force. The whole system has the advantages of simple structure and favorable economical efficiency, and is convenient for construction.

Description

technical field [0001] The invention relates to a reinforced concrete column. On the basis of traditional reinforced concrete columns, steel belt corrugated pipes are used to form a non-bonded area between steel bars and concrete at the end, which belongs to the field of structural engineering. Background technique [0002] In the structural engineering of various countries in the world, reinforced concrete structures are widely used in construction engineering due to their superiority in structural performance, economic indicators, and earthquake resistance. Among them, the column is one of the important components of the frame structure. Under the action of the earthquake, the reinforced concrete components are subjected to repeated tension and compression, and the concrete in the plastic hinge area at the end of the column with serious damage is gradually cracked or crushed and falls off, and the work is withdrawn early, resulting in The local longitudinal reinforcement ...

AI Technical Summary

Problems solved by technology

Among them, the column is one of the important components of the frame structure. Under the action of the earthquake, the reinforced concrete components are subjected to repeated tension and compression, and the concrete in the plastic hinge area at the end of the column with serious damage is gradually cracked or crushed and falls off, and the work is withdrawn early, resulting in The local longitudinal reinforcement in the plastic hinge area yields quickly, the bearing capacity decreases rapidly, and the energy dissipation capacity is poor

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