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

卷:

36卷

期数:

2019年05期

页码:

39-51

栏目:

出版日期:

2019-09-23

文章信息/Info

Title:

Axial Compression Mechanism of Round-ended Concrete-filled Steel Tubular Stub Short Columns with Binding Bars

文章编号:

1673-2049(2019)05-0039-13

作者:

任志刚,刘 闯,王丹丹,魏 巍

(武汉理工大学 土木工程与建筑学院,湖北 武汉 430070)

Author(s):

REN Zhi-gang, LIU Chuang, WANG Dan-dan, WEI Wei

(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)

关键词:

圆端形钢管混凝土;  约束拉杆;  本构关系;  轴压

Keywords:

RCFST column;  binding bar;  constitutive relationship;  axial compression

分类号:

TU398

DOI:

-

文献标志码:

A

摘要:

针对带约束拉杆圆端形钢管混凝土相对于其他截面钢管混凝土受力性能更加复杂的问题,对带约束拉杆圆端形钢管混凝土截面进行强弱约束分区,将圆端形钢管混凝土截面切分为矩形和半圆形,并分别采用不同的混凝土本构关系修正,提出一种新的圆端形钢管混凝土本构关系式; 最后提出了带约束拉杆圆端形钢管混凝土轴压承载力的推荐公式,并验证了公式的合理性。利用有限元软件对57个模型构件进行精细化分析。改变拉杆直径、混凝土强度、拉杆间距、截面含钢率、高宽比等进行参数研究。结果表明:随着截面含钢率、拉杆直径、拉杆密度的提高,构件的承载力和延性均得到提高; 混凝土强度的提高能提高构件的承载力但会导致延性降低; 提出的推荐公式考虑了拉杆系数的影响,推荐公式计算结果与有限元模拟结果非常吻合,混凝土强度超过80 MPa时,计算结果偏安全,能有效预测构件的承载性能。

Abstract:

Aiming at the problem that the mechanical behavior of round-ended concrete-filled steel tube(RCFST)was more complicated than that of other section concrete-filled steel tube, the section of round-ended concrete-filled steel tubular stub short column was divided into strong and weak constrained part, and the section of RCFST column was divided into rectangular and semi-circular sections. And a new constitutive equation of RCFST column was proposed by using different amendments of concrete constitutive relation. Finally, the recommended formula for the axial compressive bearing capacity of RCFST column was put forward, and the rationality of the formula was verified. The finite element software was used to analyze 57 model components finely. The parameters were studied by changing the diameter of binding bar, concrete strength, distance between binding bars, steel content of section, height-width ratio, etc. The results show that with the increase of steel content of section, diameter of binding bar and density of binding bar, the bearing capacity and ductility of members are improved. Increasing the strength of concrete can improve the bearing capacity of members, but it will lead to a reduction in ductility. When the strength of concrete exceeds 80 MPa, the calculation results are safe and can effectively predict the bearing capacity of members.

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相似文献/References:

[1]任志刚,张 铭,魏 巍,等.圆端形钢管混凝土中长柱轴压性能[J].建筑科学与工程学报,2020,37(03):18.[doi:10.19815/j.jace.2019.05054]
　REN Zhi-gang,ZHANG Ming,WEI Wei,et al.Axial Compression Performance of RCFST Middle Long Columns[J].Journal of Architecture and Civil Engineering,2020,37(05):18.[doi:10.19815/j.jace.2019.05054]
[2]任志刚,王丹丹.不同圆心角圆端形钢管混凝土短柱轴压性能[J].建筑科学与工程学报,2020,37(05):77.[doi:10.19815/j.jace.2019.05088]
　REN Zhi-gang,WANG Dan-dan.Behavior of Round-ended Concrete-filled Steel Tube Stub Column with Different Central Angles Under Axial Load[J].Journal of Architecture and Civil Engineering,2020,37(05):77.[doi:10.19815/j.jace.2019.05088]
[3]任志刚,徐圣海,李培鹏,等.圆端形钢管混凝土偏压柱截面优化研究[J].建筑科学与工程学报,2021,38(04):1.[doi:10.19815/j.jace.2020.08031]
　REN Zhi-gang,XU Sheng-hai,LI Pei-peng,et al.Sectional Optimization of Round-ended Rectangular Concrete-filled Steel Tubular Columns Under Eccentric Compression[J].Journal of Architecture and Civil Engineering,2021,38(05):1.[doi:10.19815/j.jace.2020.08031]
[4]任志刚,何慧峰,李 旗.广义圆端形钢管混凝土短柱轴压承载力公式[J].建筑科学与工程学报,2024,41(01):115.[doi:10.19815/j.jace.2022.01063]
　REN Zhigang,HE Huifeng,LI Qi.Formula for axial compressive bearing capacity of generalized round-ended CFST short columns[J].Journal of Architecture and Civil Engineering,2024,41(05):115.[doi:10.19815/j.jace.2022.01063]

备注/Memo

备注/Memo:

收稿日期:2018-11-21 基金项目:国家自然科学基金项目(51778512); 武汉理工大学研究生优秀学位论文培育项目(2018-YS-046) 作者简介:任志刚(1974-),男,湖北武汉人,教授,博士研究生导师,工学博士,E-mail:renzg@163.com。

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更新日期/Last Update: 2019-09-29