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

卷:

41卷

期数:

2024年02期

页码:

58-65

栏目:

建筑结构

出版日期:

2024-03-30

文章信息/Info

Title:

Mechanical properties of longitudinal steel bar C-shaped groove connection under uniaxial tension

文章编号:

1673-2049(2024)02-0058-08

作者:

张 敏^1,2,李昆松^1,2,卢 旦³,陈宜虎^1,2,4,于 伟^1,2,刘艳萍^1,2

(1. 桂林理工大学 广西建筑新能源与节能重点实验室,广西 桂林 541004; 2. 桂林理工大学 土木与建筑工程学院,广西 桂林 541004; 3. 华东建筑设计研究院有限公司,上海 200002; 4. 贺州学院 建筑与电气工程学院,广西 贺州 542899)

Author(s):

ZHANG Min^1,2, LI Kunsong^1,2, LU Dan³, CHEN Yihu^1,2,4, YU Wei^1,2, LIU Yanping^1,2

(1. Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, Guangxi, China; 3. East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China; 4. College of Architecture and Electrical Engineering, Hezhou University, Hezhou 542899, Guangxi, China)

关键词:

钢筋连接;  C型卡槽连接;  单向拉伸;  锚固板直径

Keywords:

steel bar connection;  C-shaped groove connection;  uniaxial tension;  diameter of anchor plate

分类号:

TU375

DOI:

10.19815/j.jace.2022.05002

文献标志码:

A

摘要:

为提高装配式纵向钢筋连接的施工效率,提出了C型卡槽连接方式,制作9个连接件并进行单向拉伸试验,观察其破坏形态,研究试件荷载-位移曲线、应变发展过程,分析不同锚固板直径对连接件连接性能的影响; 基于混凝土局部受压计算公式,推导出C型卡槽连接钢筋的承载力计算公式,并给出不同锚固板直径与带锚固板钢筋直径的适配表。结果表明:锚固板直径为43 mm和48 mm的连接件发生带锚固板钢筋拉断破坏,荷载-位移曲线与单根钢筋拉伸的荷载-位移曲线相似,均能满足JGJ 107—2016和ACI 318对接头的强度要求; 锚固板直径为38 mm的连接件是依据JGJ 256—2011选取锚固板直径,试验过程中发生带锚固板钢筋拔出破坏,证明按照规程取值,锚固板直径偏小,无法满足连接要求; 锚固板直径为38 mm的连接件其荷载-位移曲线呈现波浪形,承载力虽小于前两者,但仍具有较好的延性和较高的残余承载力; 所有连接件的C型卡槽在整个受力过程中应变值较小,始终处于弹性阶段,C型卡槽环向应变表现为压应变,C型卡槽连接钢筋承载力的理论计算结果与试验结果相符。

Abstract:

In order to improve the construction efficiency of prefabricated longitudinal reinforcement connection, the C-shaped groove connection method was proposed. Nine connectors were made and uniaxial tensile tests were carried out to observe their failure modes. The load-displacement curve and strain development process of specimens were studied, and the influence of different anchor plate diameters on the connection performance of connectors was analyzed. Based on the calculation formula of local compression of concrete, the calculation formula of bearing capacity of C-shaped groove connection steel bar was derived. The fitting table of different anchorage plate diameters and the diameter of steel bar with anchorage plate was given. The results show that the connector with anchor plate diameter of 43 mm and 48 mm has tensile failure of steel bars with anchor plate, and the load-displacement curve is similar to the load-displacement curve of single steel bar, which can meet the strength requirements of JGJ 107—2016 and ACI 318. Anchor plate diameter of 38 mm connector is based on JGJ 256—2011 specification to select the diameter of the anchor plate, and the pull-out failure of the steel bar with anchor plate occurs during the test. It is proved that according to the specification, the diameter of the anchor plate is too small to meet the connection requirements. The load-displacement curve of the connector with the diameter of 38 mm is wavy. Although the bearing capacity is less than the former two, it still has good ductility and high residual bearing capacity. The C-shaped grooves of all connectors have small strain values throughout the loading process and are always in the elastic stage. The circumferential strain of C-shaped grooves is compressive strain. The theoretical calculation results of bearing capacity of C-shaped groove connection steel bar are consistent with the experimental results.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2023-05-07
基金项目:广西自然科学基金项目(2018GXNSFAA050145); 广西重点研发计划项目(2021AB31014); 国家自然科学基金项目(51868013)
作者简介:张 敏(1980-),男,工学博士,教授,E-mail:emailzm@126.com.。
通信作者:卢 旦(1978-),男,工学博士,教授级高级工程师,E-mail:474558052@qq.com。

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更新日期/Last Update: 2024-03-25