UHPC-based fabricated combined beam-column joint and construction method thereof

Abstract

The invention relates to a UHPC-based fabricated combined beam-column joint and a construction method thereof. The UHPC-based fabricated combined beam-column joint comprises a prefabricated column, a prefabricated beam and a joint post-pouring area; the mechanical property of the column end of the prefabricated column is higher than that of the column middle; the mechanical property of the beam end of the precast beam is higher than that of the beam middle; and a longitudinal lap-joint steel bar of the joint post-pouring area is in pouring connection with the column end, and a transverse lap-joint steel bar is in pouring connection with the beam end. According to the UHPC-based fabricated combined beam-column joint and the construction method thereof, stirrups for enhancing the structural strength do not need to be arranged in the joint post-pouring area, the beam end and the column end; the longitudinal bar lap-joint length of the prefabricated beam and the prefabricated column can be greatly reduced compared with common concrete; the longitudinal bars of the prefabricated column do not need sleeve connection; the upper steel bars of the prefabricated column and the prefabricated beam are almost not exposed; and the UHPC-based fabricated combined beam-column joint is convenient to construct, the using amount of concrete (such as ultra-high performance concrete) with high mechanical performance is small, and good comprehensive economic benefits and anti-seismic performance are achieved.

Description

technical field [0001] The invention relates to the technical field of building structures, in particular to a UHPC-based assembled composite beam-column node and a construction method thereof. Background technique [0002] Reinforced concrete (RC) frame structures have the advantages of easy space separation, light weight, and flexible building layout, and are widely used in multi- and high-rise public buildings that undertake important social functions such as office buildings, hospitals, and teaching buildings. The post-cast monolithic prefabricated concrete frames widely used at present mainly have the following deficiencies: (1) Beam-column joints in high-intensity areas need to be equipped with dense stirrups at the beam ends, column ends, and joint core areas, and the bottom reinforcement of bidirectional frame beams The need for anchorage in the joint area leads to difficulties in on-site construction; (2) the longitudinal reinforcement of the column needs to be conn...

AI Technical Summary

Problems solved by technology

The post-cast monolithic prefabricated concrete frames widely used at present mainly have the following deficiencies: (1) Beam-column joints in high-intensity areas need to be equipped with dense stirrups at the beam ends, column ends, and joint core areas, and the bottom reinforcement of bidirectional frame beams The need for anchorage in the joint area leads to difficulties in on-site construction; (2) the longitudinal reinforcement of the column needs to be connected by sleeves above the joint area, which requires strict construction accuracy and further increases the difficulty of construction; (3) prefabricated components often have a large number of steel bars exposed, resulting in Transportation and installation are inconvenient; (4) The steel bars in the post-casting area of ​​the node are dense, which affects the pouring quality of the post-casting area of ​​the node

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