|Table of Contents|

Application Research on Prefabricated Concrete U-shaped Reinforcement Buckle Connection Technology(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年01期
Page:
14-24
Research Field:
Publishing date:

Info

Title:
Application Research on Prefabricated Concrete U-shaped Reinforcement Buckle Connection Technology
Author(s):
ZHANG Min1; 2;  LIU Yan-ping1; 2;  QIU Xiu-li3;  LU Dan4;  CHEN Yi-hu3;  QIN Wen1; 2; 5;  MENG Qing-peng1; 2
Keywords:
prefabricated construction;  beam-column joint;  quasi-static test;  anti-seismic
PACS:
TU756
DOI:
10.19815/j.jace.2021.04020
Abstract:
A prefabricated concrete U-shaped reinforcement buckle connection technology was developed, and the pseudo-static tests on specimens that adopted 4 different connection methods were conducted. The test phenomena and failure modes were observed, and the stiffness, ductility, and hysteresis behavior, energy consumption of various connections were analyzed. The results show that the bearing capacity of the U-shaped buckle connection node is much higher than that of the cast-in-place node, and the steel bar does not reach yield when the connection part fails, and there is still a large room for optimization. The overlapped steel bar of the 90° bend anchor connection node is equivalent to cast-in-place joints in terms of bearing capacity under the reciprocating load, and it is inferior to cast-in-place joint and U-shaped buckle connection in terms of ductility, stiffness, and energy dissipation capacity. It has not achieved effective anchorage in concrete, when the concrete is crushed, the overlapped steel bars are not yielded. Although the U-shaped buckle connection node is inferior to the cast-in-place joint in terms of ductility, it is better than the in-situ joint in terms of bearing capacity and stiffness degradation. The specimens that adopted U-shaped buckle connection have the problem of densely arranged steel bars, so the ability of concrete to hold the steel bars is weak, and the concrete in the overlap area is damaged and destroyed earlier. Compared with the U-shaped buckle one-time overlap method, the U-shaped buckle batch overlap method has less local damage to the concrete, and the ductility and energy dissipation capacity of the connection are better. The stressed steel bar of the component that adopts the batch overlap method is tensile yielded at the overlap joint, the hysteretic loop is full, and the force state is good. Therefore, batch overlap is one of the effective measures to improve the U-shaped buckle connection.

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Last Update: 2021-02-10