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

卷:

42卷

期数:

2025年06期

页码:

22-34

栏目:

建筑结构

出版日期:

2025-11-25

文章信息/Info

Title:

Study on seismic behavior of monolithic precast concrete frame U-shaped beam-column joints

文章编号:

1673-2049(2025)06-0022-13

作者:

江胜学¹,徐军林¹,汤明生²,阮子兴²,谷倩²

(1. 中铁第四勘察设计院集团有限公司,湖北 武汉 430063; 2. 武汉理工大学 土木工程与建筑学院,湖北 武汉 430070)

Author(s):

JIANG Shengxue¹, XU Junlin¹, TANG Mingsheng², RUAN Zixing², GU Qian²

(1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)

关键词:

U型梁-柱节点;  无接触间接搭接;  抗震性能;  拟静力试验;  数值模拟

Keywords:

U-shaped beam-column joint;  non-contact lap splice;  seismic behavior;  quasi-static test;  numerical simulation

分类号:

TU375.4

DOI:

10.19815/j.jace.2024.05039

文献标志码:

A

摘要:

为解决底筋锚入式连接节点核心区钢筋堵塞问题,提出一种装配整体式混凝土框架U型梁-柱节点,其U型梁的梁底纵向钢筋和腰筋不伸出梁端,分别与U型梁空腔内设置的附加连接钢筋和附加腰筋通过无接触间接搭接,代替梁底纵向钢筋和腰筋直接伸入节点核心区,实现荷载传递。为研究该新型节点的抗震性能,对2个足尺梁柱中节点试件进行拟静力试验,包括1个新型节点试件和1个现浇对比节点试件。同时,基于有限元软件ABAQUS建立了新型节点的精细化模型,通过与试验结果进行对比,验证模型的有效性。结果表明:所有试件均为“梁铰”机制破坏,新型节点试件表现出不弱于现浇对比节点试件的抗震性能; 无接触间接搭接传力可行,现浇对比节点试件梁下部应力由梁底纵向钢筋承担,而新型节点试件转为附加连接钢筋承担; 在保证钢筋与混凝土黏结性能的前提下,改变附加连接钢筋无接触间接搭接长度和后浇混凝土强度等级对新型节点承载能力无明显影响,提高附加连接钢筋直径可有效提高新型节点承载能力。

Abstract:

To reduce the congestion problem of beam-column joints with hooked beam bottom longitudinal rebars, a monolithic precast concrete frame U-shaped beam-column joint(UBCJ)was proposed. The bottom longitudinal rebars and waist rebars of U-shaped beam did not protrude from the beam end, and they were connected to additional rebars and additional waist rebars set up in the U-shaped groove through non-contact lap splice to replace the bottom longitudinal rebars and waist rebars directly inserted into the core area of the joint for load transfer. To investigate the seismic behavior of the UBCJs, quasi-static tests were conducted on two full-scale beam-column joint specimens, including one UBCJ specimen and one cast-in-place comparison joint specimen. A refined finite element model of the new joint was also developed in ABAQUS, and its accuracy was verified by compared with the experimental results. The results show that all specimens failed due to the “beam hinge” mechanism. The seismic behavior of the UBCJ specimen is not weaker than that of the cast-in-place comparison joint specimen. The non-contact lap splice load transfer is feasible. For the cast-in-place comparison joint specimen, the stress in the bottom of beam is carried by the bottom longitudinal rebars, while in the UBCJ specimen, the stress is carried by the additional rebars. Under the condition of guaranteeing the bonding performance of rebars and concrete, changing the non-contact lap splice length of the additional rebars and the strength grade of the post-poured concrete has no significant impact on the bearing capacity of the UBCJs, and increasing the diameter of the additional rebars can effectively improve the bearing capacity of the UBCJs.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-05-13
基金项目:铁四院年度研发项目(2021K023,KY2023023S); 武汉市城建局科技计划项目(202209)
作者简介:江胜学(1981-),男,高级工程师,E-mail:126957515@qq.com.
通信作者:谷 倩(1972-),女,工学博士,教授,博士生导师,E-mail:guqian@whut.edu.cn.

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更新日期/Last Update: 2025-11-25