Partially bonded prestress assembly self-reset bridge pier column node and method

Abstract

The invention relates to a partially bonded prestress assembly self-reset bridge pier column node and a method. The node comprises a pier column, wherein a main body of the pier column is fabricated by concrete; the lower end of the pier column is inserted into a foundation and fixedly connected with the foundation; the upper end of the pier column is fixedly connected with a capping beam; a prestressed reinforcement is arranged in the pier column; a central axis of the pier column is coincided with that of the prestressed reinforcement; the lower end of the prestressed reinforcement is inserted into the foundation along with the pier column; the middle of the prestressed reinforcement is arranged in the pier column; the upper end of the prestressed reinforcement penetrates out of the piercolumn and is inserted into the capping beam; the lower end of the prestressed reinforcement is bound and fixed to the pier column; the upper end of the prestressed reinforcement is bound and fixed to the capping beam; the middle of the prestressed reinforcement is arranged in a prestressed reinforcement duct of the pier column; the upper end of the prestressed reinforcement duct penetrates through the pier column; the lower end of the prestressed reinforcement duct is positioned in the pier column; and the lower end of the prestressed reinforcement is fixedly connected with the pier column through an anchor piece. The disadvantages of long construction cycle and high cost due to adoption of an external dissipative element and post tensioned application of prestress can be avoided, and the probability of brittle failure of the pier column is reduced.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a partially bonded prestressed assembly type self-resetting bridge pier node and a method. Background technique [0002] The prefabricated bridge structure has the advantages of high degree of industrialization, material saving, and less wet work on site. For prefabricated concrete bridge structures, the seismic performance and construction efficiency of pier columns, pier column-foundation joints and pier column-cap beam joints are the key to their popularization and application. [0003] The inventors have learned that currently there are few studies on prefabricated concrete bridge structures with recoverable functions, and the bridge piers in the project are still mainly cast-in-place concrete, lacking mature and efficient prefabricated node structures. At the same time, the existing fabricated pier-column joint structure, which is equivalent to cast-in...

AI Technical Summary

Problems solved by technology

[0005] 1) Since the conventional prestressed self-resetting structure adopts the post-tensioning method at the construction site, it has a great influence on the construction sequence and reduces the construction efficiency of the prefabricated bridge structure

[0006] 2) In order to improve the energy dissipation capacity of piers, it is usually necessary to install external energy dissipation elements, which further reduces the efficiency of on-site assembly and increases the cost of bridge construction

[0007] 3) For the full-length unbonded prestressed structure, under repeated seismic loads, the anchorage system of the prestressed tendons is prone to fatigue failure, the damage of the anchorage system makes the prestressed tendons unable to function, and the pier column structure is prone to brittle failure It may even cause partial collapse and bring hidden dangers to the safety of the entire structure.

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