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

卷:

40卷

期数:

2023年05期

页码:

78-88

栏目:

建筑结构

出版日期:

2023-09-15

文章信息/Info

Title:

Axial compressive performance of steel reinforced ultra-high performance concrete filled square stainless steel tube

文章编号:

1673-2049(2023)05-0078-11

作者:

程 展,李俊华,刘子丹,杜国锋

(长江大学 城市建设学院, 湖北 荆州 434023)

Author(s):

CHENG Zhan, LI Junhua, LIU Zidan, DU Guofeng

(School of Urban Construction,Yangtze University, Jingzhou 434023, Hubei, China)

关键词:

方形不锈钢管;  超高性能混凝土;  轴压试验;  承载力;  数值模拟

Keywords:

square stainless steel tube;  UHPC;  axial compression test;  bearing capacity;  numerical simulation

分类号:

TU398.9

DOI:

10.19815/j.jace.2022.02071

文献标志码:

A

摘要:

为研究内置钢骨的方形不锈钢管超高性能混凝土短柱轴心受压性能,以径厚比和钢骨面积为参数设计了6个构件,进行了轴压试验和数值模拟计算,得到了构件的破坏形态、极限承载力和荷载-位移曲线等,利用有限元分析方法进行参数拓展,研究了长径比、混凝土强度等变化对构件破坏过程、极限承载力和延性的影响。基于试验与数值模拟结果,提出了内置钢骨的方形不锈钢管超高性能混凝土短柱轴心受压承载力计算公式。结果表明:所有构件破坏特征相似,中部均出现了局部波形鼓曲,但含钢骨构件的端部也产生鼓曲; 构件中不同材料对极限承载力和延性的影响效果不同,极限承载力随着钢骨截面面积和混凝土强度的增加而增大,随着径厚比和长径比的增大而减小,但径厚比和混凝土强度对构件极限承载力的影响更为明显; 钢骨的存在对构件的延性有明显提高,且随着钢骨截面面积增大构件延性也有所提高,而混凝土强度增大会导致构件延性减小; 轴心受压承载力公式计算结果与试验结果吻合良好。

Abstract:

In order to study the axial compressive performance of steel reinforced ultra-high performance concrete filled square stainless steel tube(SR-UHPCFSSST), six members were designed with the parameters of diameter-to-thickness ratio and steel section area, and axial compression test and numerical simulation calculation were performed to obtain the failure form, ultimate bearing capacity and load-displacement curve of members. Using finite element analysis method to expand the parameters, the effects of changes in aspect ratio and concrete strength on the failure process, ultimate bearing capacity and ductility of the members were studied. Based on the test and numerical simulation results, the calculation formula of SR-UHPCFSSST was put forward. The results show that the failure characteristics of all members are similar, and there is local waveform drum in the middle, but there is also drum at the end of the member containing steel bone. Different materials in the members have different effects on the ultimate bearing capacity and ductility. The ultimate bearing capacity increases with the increase of steel section area and concrete strength, and decreases with the increase of diameter-to-thickness ratio and aspect ratio, but the influence of diameter-to-thickness ratio and concrete strength on the ultimate bearing capacity of the members is more obvious. The existence of steel bone significantly improves the ductility of the member, and the ductility of the member also increases with the increase of the steel section area, while the increase of concrete strength will reduce the ductility of the member. The calculation results are in good agreement with the test results.

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备注/Memo

备注/Memo:

收稿日期:2022-02-24
基金项目:国家自然科学基金项目(52078052)
通信作者:杜国锋(1975-),男,工学博士,教授,博士生导师,E-mail:gfdu@yangtzeu.edu.cn。

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更新日期/Last Update: 2023-09-01