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

卷:

37卷

期数:

2020年05期

页码:

161-169

栏目:

出版日期:

2020-09-30

文章信息/Info

Title:

Effect of Initial Imperfection on Post-buckling Strength of Concrete-filled Rectangular Steel Tubular Column Slab

文章编号:

1673-2049(2020)05-0170-12

作者:

卢 迅¹,刘永健^1,2,孙立鹏¹,姜 磊^1,2

1. 长安大学 公路学院,陕西 西安 710064; 2. 长安大学 公路大型结构安全教育部工程研究中心,陕西 西安 710064

Author(s):

LU Xun¹, LIU Yong-jian^1,2, SUN Li-peng¹, JIANG Lei^1,2

1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Research Center of Highway Large Structure Engineering on Safety of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China

关键词:

钢管混凝土;  焊接残余应力;  几何初始缺陷;  屈曲后强度

Keywords:

concrete-filled steel tube;  welding residual stress;  initial geometric imperfection;  post-buckling strength

分类号:

TU312

DOI:

10.19815/j.jace.2020.09044

文献标志码:

A

摘要:

为了研究焊接残余应力和几何初始缺陷对矩形钢管混凝土柱壁板屈曲后强度的影响,采用有限元软件ABAQUS进行参数分析,参数包括壁板的屈服强度、宽厚比、几何初始缺陷取值大小、是否施加几何初始缺陷和焊接残余应力,并考虑两者耦合作用,给出考虑焊接残余应力和几何初始缺陷后的矩形钢管混凝土柱壁板有效宽度计算公式,并与试验数据进行比较。结果表明:建立的有限元模型能较好地模拟壁板的局部屈曲和屈曲后行为,焊接残余应力和几何初始缺陷都会降低壁板屈曲后强度,且焊接残余应力的影响较大; 不同强度等级的钢材都需要考虑焊接残余应力和几何初始缺陷的影响,对于屈服强度大于460 MPa的高强钢材,当宽厚比大于65时,可以忽略几何初始缺陷的影响; 给出的有效宽度计算公式可以较为准确且偏保守地预测矩形钢管混凝土柱壁板屈曲后强度。

Abstract:

In order to study the influence of welding residual stress and initial geometric imperfection on the post-buckling strength of concrete-filled rectangular steel tubular column slab, the finite element software ABAQUS was used to analyze the parameters, including the yield strength of slab, the ratio of width to thickness, the size of initial geometric imperfection, the application of initial geometric imperfection and welding residual stress, and the coupling effect of the two was considered. Finally, the formula of effective width of concrete-filled rectangular steel tubular column slab considering welding residual stress and initial geometric imperfection was given and compared with the experimental data. The results show that the finite element model established can better simulate the local buckling and post-buckling behavior of the slab, welding residual stress and initial geometric imperfection will reduce the post-buckling strength of the slab, and the influence of welding residual stress is greater. The effects of welding residual stress and initial geometric imperfection need to be considered for steels with different strength grades. For high strength steels with yield strength greater than 460 MPa, the influence of initial geometric imperfection can be ignored when the ratio of width to thickness is greater than 65. The effective width formula can accurately and conservatively predict the post-buckling strength of concrete-filled rectangular steel tubular column slab.

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备注/Memo

备注/Memo:

收稿日期:2020-09-21
基金项目:国家自然科学基金项目(51778058); 中央高校基本科研业务费专项资金项目(300102219310)
作者简介:卢 迅(1995-),男,福建莆田人,工学硕士研究生,E-mail:chdxiaolu@163.com。
通信作者:刘永健(1966-),男,江西玉山人,教授,博士研究生导师,工学博士,E-mail:liuyongjian@chd.edu.cn。

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更新日期/Last Update: 2020-10-15