Research on bearing capacity of normal section of concrete-filled steel tube beam reinforced with round steel

被引：0

作者：

Liu D. ^{[1
,2
]}

Xia Z. ^{[2
,3
]}

Wang J. ^{[4
]}

Zuo J. ^{[1
,2
]}

Chang Y. ^{[2
]}

Chang J. ^{[2
]}

机构：

[1] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing

[2] School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing

[3] School of Civil Engineering, Southeast University, Nanjing

[4] School of Civil Engineering, Shandong Jianzhu University, Jinan

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 01期

基金：

中国国家自然科学基金;

关键词：

CFST beam; flexural behavior; flexural strengthening; neutral axis; welding round steel;

D O I：

10.11817/j.issn.1672-7207.2023.01.023

中图分类号：

学科分类号：

摘要：

In order to explore the effect of welding round steel at the soffit on the flexural behavior of concrete-filled steel tube(CFST) beams, six specimens were firstly tested under four-point bending load, including a reference beam and five strengthened beams reinforced with round steel of different diameters. Then, the calculation theory of bending bearing capacity of the normal section of the strengthened CFST beams was proposed and validated by experimental results. The neutral axis offset of the normal section of the strengthened beams and the contribution of each part to the flexural bearing behavior were further analyzed, and the improvement mechanism of the round steel on the flexural behavior of the CFST beams was revealed. Finally, the parameter sensitivity analysis was carried out using the proposed calculation theory. The results show that the neutral axis of normal section of the strengthened beam moves downward caused by the welded round steel, and therefore the flexural bearing capacity of the CFST beams is significantly improved. As the diameter of the round steel increases, the flexural capacity of the steel tube remains basically unchanged, whereas the flexural capacity of the round steel and the core concrete increases, but the increase rate of flexural capacity of the round steel is more obvious. Therefore, the enhancement of the flexural capacity of the strengthened CFST beams mainly benefits from the flexural capacity of the round steel. The flexural capacity of the CFST beams can be effectively improved by increasing the strength of steel tube and round steel, but the effect of increasing the strength of round steel on flexural capacity is more obvious. © 2023 Central South University of Technology. All rights reserved.

引用

页码：249 / 258

页数：9

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