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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05期

页码:

55-65

栏目:

建筑结构

出版日期:

2025-09-30

文章信息/Info

Title:

Experimental study of mechanical characteristics of assembled concrete-filled steel tube brace

文章编号:

1673-2049(2025)05-0055-11

作者:

申培武^1,2,欧阳冬³

(1. 武汉地铁集团有限公司,湖北 武汉 430070; 2. 华中科技大学 土木与水利工程学院,湖北 武汉 430074; 3. 中铁第四勘察设计院集团有限公司, 湖北 武汉 430063)

Author(s):

SHEN Peiwu^1,2, OUYANG Dong³

(1. Wuhan Metro Group Co., Ltd., Wuhan 430070, Hubei, China; 2. School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China; 3. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China)

关键词:

装配式支撑;  钢管混凝土柱体;  法兰节点;  单轴压缩;  四点抗弯

Keywords:

assembled brace;  concrete-filled steel tube column;  flange joint;  uniaxial compression;  four-point bending

分类号:

TU375

DOI:

10.19815/j.jace.2024.02015

文献标志码:

A

摘要:

为研究装配式钢管混凝土支撑的力学特性,设计了2组柱体试样与3组节点试样,分别开展了柱体试样的单轴压缩模型试验与数值模拟、节点试样的四点抗弯模型试验与数值模拟研究; 提出了经济性指标与碳排放指标,分析装配式钢管混凝土支撑的经济性与碳排放优势。结果表明:柱体试样破坏时,端部混凝土出现张拉裂隙且端部钢管鼓曲变形,混凝土的横向变形明显受钢管抑制,混凝土厚度的增加延长了试样的压密变形阶段且提高了试样的残余强度; 节点试样破坏时,破坏范围主要集中在受拉侧加劲肋与相连法兰板,底部螺栓在试样变形过程中承受较大拉应力,节点类型与加载位置的合理设计可有效提升试样的承载能力; 各试样的数值模拟结果与模型试验结果吻合较好; 在满足设计要求的基础上,“柱体试样1+节点试样3”的组合形式表现出更低的使用成本,“柱体试样1+节点试样2”的组合形式表现出更高的承载能力; 相较于装配式钢管支撑与现浇钢混支撑,装配式钢管混凝土支撑的经济性与碳排放优势随使用次数的增加更为显著。

Abstract:

In order to study the mechanical characteristics of assembled concrete-filled steel tube brace, two groups of concrete-filled steel tube column specimens and three groups of flange joint specimens were designed. The uniaxial compression model test and numerical simulation of the column specimens and the four-point bending model test and numerical simulation of the joint specimens were carried out respectively. The economic index and carbon emission index were proposed to analyze the economic advantage and carbon emission advantage of assembled concrete-filled steel tube brace. The results show that tensile cracks appear in the end concrete and the steel tube at the end is buckled when the column specimen is destroyed. The transverse deformation of concrete is obviously inhibited by steel tube, and the increase of concrete thickness prolongates the compaction deformation stage and increases the residual strength. The damage areas are mainly concentrated on the tension side of stiffeners and the connected flange plates when joint specimens reach failure. The bottom bolts are subjected to great tensile stress in the deformation process of joint specimens, and reasonable design of joint type and loading position can effectively improve the bearing capacity of joint specimens. The numerical test result of each specimen is consistent with the model test result. On the basis of meeting design requirement, the combination form of “column specimen 1 and joint specimen 3 ”shows a lower operating cost, while the combination form of “column specimen 1 and joint specimen 2” shows a higher bearing capacity. Compared with assembled steel tube brace and cast-in-place steel-concrete brace, the economic advantage and carbon emission advantage of assembled concrete-filled steel tube brace become more obvious with the increase of usage count.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-02-05 投稿网址:http://jace.chd.edu.cn
基金项目:国家重点研发计划项目(2019YFC0605100); 武汉地铁集团科研计划项目(GS-JZ-1226)
作者简介:申培武(1994-),男,工学博士,博士后,E-mail:pwshen@cug.edu.cn。
Author resume: SHEN Peiwu(1994-), male, PhD, E-mail:pwshen@cug.edu.cn.

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更新日期/Last Update: 2025-09-25