A locally prestressed assembled energy-dissipating beam-column joint

Abstract

The invention discloses a local prestress assembly type energy-dissipating beam column joint. The beam column joint comprises a precast concrete column, a precast concrete beam, replaceable energy-dissipating bars, prestress ribs and an anchor. Prestress rib porous channels and brackets are reserved in a joint area of the precast concrete column. The precast concrete beam is a pre-tensioned prestress beam, a prestress rib porous channel is formed in the middle of the section of the beam end, and a rabbet is formed in the lower part of the beam end. The precast concrete beam is placed on the brackets and is fixed through local post-tensioned prestress ribs in a pressure welding mode, and concrete is poured on the upper surface of the precast concrete beam in a cast-in-place mode at floor height. The replaceable energy-dissipating bars are installed on the upper surface and the lower surface of the precast concrete beam, and the number, the specification and action time of the replaceable energy-dissipating bars are designed according to different seismic levels. When located on the lower surface of the precast concrete beam, the replaceable energy-dissipating bars penetrate through reserved holes in the brackets, and exposed parts are wrapped with mortar. The local prestress assembly type energy-dissipating beam column joint improves restorability of a precast concrete framework under earthquakes, energy dissipation capacity is enhanced, hierarchical shock absorption and energy dissipation are achieved, and post-seismic reparation is facilitated.

Description

technical field [0001] The invention relates to a prestressed assembled energy-dissipating beam-column joint, which belongs to the field of construction engineering. Background technique [0002] The prefabricated concrete frame structure can greatly improve the construction capacity and construction speed, save a lot of labor, ensure the construction quality, and help meet the requirements of "four festivals and one environmental protection", and intensify the promotion of "building industrialization and housing industrialization" in the country. It has a good development prospect under the background of promoting green building and green construction. In terms of structural performance, the beam-column connection nodes of precast concrete frame structures are related to the seismic performance of the entire structure. Previous structural earthquake damage has shown that the damage of beam-column connection nodes is often the main cause of structural failure. Therefore, the...

AI Technical Summary

Problems solved by technology

However, at present, conventional prestressed precast beam-to-column connections mostly adopt the form of prestressed tendons arranged along the entire length of the precast beam. The prestressed tensile force is high, and the workload of prestressed tendon perforation is large, and post-tensioned prestressing significantly affects the overall quality of the precast beam. Force performance

[0004] The prestressed prefabricated concrete structure has high deformation recovery capacity due to the presence of prestressed tendons, but its energy dissipation capacity is weak, and it is necessary to increase the energy dissipation capacity through corresponding measures

The energy dissipation capacity of general energy-dissipating components can only be designed for a single definite seismic level, and often does not work under earthquakes smaller than this level

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