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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:

68-76

栏目:

建筑结构

出版日期:

2025-11-25

文章信息/Info

Title:

Experimental study on collapse resistance of prefabricated concrete-filled steel tubular joints

文章编号:

1673-2049(2025)06-0068-09

作者:

戎贤^1,2,彭鹤翔¹,石晓娜^1,3,李艳艳^1,2

(1. 河北工业大学 土木与交通学院,天津 300401; 2. 河北工业大学 河北省土木技术创新中心,天津 300401; 3. 中土大地国际建筑设计有限公司,河北 石家庄 050035)

Author(s):

RONG Xian^1,2, PENG Hexiang¹, SHI Xiaona^1,3, LI Yanyan^1,2

(1.School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Civil Engineering Technology Innovation Center of Hebei Province, Hebei University of Technology, Tianjin 300401, China; 3. Zhongtu Dadi International Architectural Design Co., Ltd., Shijiazhuang 050035, Hebei, China)

关键词:

钢管混凝土节点;  抗倒塌性能;  拟静力荷载试验;  悬链线机制;  等效动力分析

Keywords:

concrete-filled steel tubular joint;  collapse resistance;  quasi-static load test;  catenary mechanism;  equivalent dynamic analysis

分类号:

TU398

DOI:

10.19815/j.jace.2024.07060

文献标志码:

A

摘要:

为研究钢管混凝土节点的抗倒塌性能,提升装配式钢管混凝土节点在中柱失效工况下的承载能力,研究了节点拉弯性能和转动能力对结构抗倒塌能力的影响。设计节点连接处螺栓孔分别开设圆孔和长圆孔的两个试件,开展线性拟静力荷载试验,通过试验现象探究节点关键部位的受力情况与应变分布情况。通过对节点内力进行分解,分析节点的抗弯机制和悬链线机制对竖向承载力的作用。同时对节点的延性性能进行等效动力分析,在DoD规范的基础上提出符合钢管混凝土节点的动力放大系数计算公式,并讨论其准确性。结果表明:远离节点核心区的梁截面在加载过程中始终处于弹性状态; 节点产生大位移前由钢梁发挥抗弯性能抵抗荷载,节点产生大位移后通过发挥悬链线效应抵抗荷载; 连接处螺栓孔开设长圆孔的节点通过削弱部分抗弯性能,更加充分地发挥了悬链线效应,提高了节点的延性、转动能力与承载力,且试验加载过程中应力分布均匀,不易产生应力集中破坏; 提出的动力放大系数计算公式可以较好地预测节点悬链线阶段的动态效应,更符合钢管混凝土结构连续倒塌工况下延性的发展趋势。

Abstract:

In order to study the collapse resistance of concrete-filled steel tubular joints and improve the bearing capacity of prefabricated concrete-filled steel tubular joints under the failure condition of the middle column, the influence of the tensile bending performance and rotation capacity of the joints on the collapse resistance of structure was studied. Two specimens with circular holes and long circular holes were designed for the bolt holes at the joint connection, and the linear quasi-static load test was carried out to explore the stress and strain distribution of the key parts of joint through the test phenomenon. By decomposing the internal force of the joint, the bending mechanism of the joint and the effect of catenary mechanism on the vertical bearing capacity were analyzed. At the same time, the equivalent dynamic analysis of the ductility performance of the joint was carried out. Based on the DoD specification, the calculation formula of the dynamic magnification factor of concrete-filled steel tubular joint was proposed, and its accuracy was discussed. The results show that the beam section far away from the core of the joint is always in an elastic state during the loading process. The steel beam exerts its bending resistance to resist the load before the joint produces large displacement, and exerts the catenary effect to resist the load after the joint produces large displacement. The joints with long circular holes in the bolt holes at the connection can give full play to the catenary effect by weakening some of the bending resistance, and improve the ductility, rotation capacity and bearing capacity of the joints. The stress distribution is uniform during the test loading process, which is not easy to produce stress concentration failure. The calculation formula of dynamic amplification factor can better predict the dynamic effect of node catenary stage, and is more in line with the development trend of ductility of concrete-filled steel tubular structures under progressive collapse conditions.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-07-21
基金项目:国家自然科学基金项目(52108132); 河北省自然科学基金项目(E2017202278)
作者简介:戎 贤(1965-),男,工学博士,教授,博士生导师,E-mail:xrong516@126.com。
通信作者:石晓娜(1987-),女,工学博士,正高级工程师,E-mail:andysna@163.com。

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更新日期/Last Update: 2025-11-25