外包不锈钢管中空夹层钢管混凝土压弯构件Nu -Mu相关曲线研究

张颖; 赵晖; 王蕊; 陈鹏

doi:10.6052/j.issn.1000-4750.2021.08.0637

外包不锈钢管中空夹层钢管混凝土压弯构件N_u -M_u相关曲线研究

doi: 10.6052/j.issn.1000-4750.2021.08.0637

张颖^1,,
赵晖^{1, 2,},
王蕊^1, ,,
陈鹏^3,

1.
太原理工大学土木工程学院，太原 030024
2.
天津大学建筑工程学院，天津 300350
3.
石家庄铁道大学工程力学系，石家庄 050043

基金项目: 山西省留学人员科技活动择优资助项目(20210010)；中国博士后科学基金项目(2020M670656)

详细信息

作者简介:
张颖(1995−)，女，陕西西安人，硕士生，主要从事组合结构基本力学性能研究(E-mail: zhangying_qm@163.com)

赵晖(1988−)，男，山西吕梁人，副教授，博士，主要从事组合结构抗火与抗撞研究 (E-mail: zhaohui01@tyut.edu.cn)

陈鹏(1988−)，男，河北衡水人，讲师，博士，主要从事钢-混凝土组合结构基本力学性能研究(E-mail: chenpeng@stdu.edu.cn)

通讯作者:
王蕊(1979−)，女，山西太原人，教授，博士，主要从事组合结构防灾减灾研究 (E-mail: wangrui@tyut.edu.cn)

中图分类号: TU398+.9
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出版历程
- 收稿日期: 2021-08-16
- 录用日期: 2021-12-17
- 修回日期: 2021-12-01
- 网络出版日期: 2021-12-17
- 刊出日期: 2023-02-01

STUDY ON N_u -M_u CORRELATION CURVES OF CONCRETE FILLED DOUBLE SKIN STEEL TUBULAR (CFDST) BEAM-COLUMNS WITH EXTERNAL STAINLESS STEEL TUBE

ZHANG Ying^1
,,
ZHAO Hui^{1, 2
,},
WANG Rui^{1
, ,},
CHEN Peng^3
,

1.
College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
School of Civil Engineering and Architecture, Tianjin University, Tianjin 300350, China
3.
Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

摘要

摘要: 外包不锈钢管中空夹层钢管混凝土构件结合了中空夹层钢管混凝土(CFDST)与不锈钢的优点，在桥墩、海洋平台与输电塔结构中有广泛应用前景。为此，该文基于前期试验，采用自编纤维模型法程序对225个外包不锈钢管CFDST压弯构件进行了系统分析。研究了各参数对该类压弯构件典型N/N_u-M/M_u曲线的影响，并将相关曲线与普通外包碳素钢管CFDST构件进行了对比，最后提出了该类压弯构件N/N_u-M/M_u相关曲线方程。分析结果表明：该文自编纤维模型法程序可较好预测外包不锈钢管CFDST构件压弯承载力以及N/N_u-M/M_u曲线的发展；混凝土强度、内管径厚比、钢材屈服强度、空心率、名义含钢率与长细比影响N/N_u-M/M_u曲线的形状；由于不锈钢材料明显的应变强化效应，相比于外包碳素钢管CFDST构件，外包不锈钢管CFDST构件的N/N_u-M/M_u曲线接近于钢结构；基于试验与参数分析结果以及外包碳素钢CFDST计算公式，得到了外包不锈钢CFDST相关曲线特征点公式和曲线方程，与程序计算结果吻合较好。
- 中空夹层钢管混凝土 /
- 不锈钢 /
- 纤维模型法 /
- 压弯 /
- N/N_u-M/M_u曲线 /
- 计算方法
Abstract: Concrete filled double skin steel tubular (CFDST) members with external stainless steel tubes present the merits of CFDST members and stainless steel, and have a wide application prospect in bridge piers, in offshore platforms and, in transmission towers. For this purpose, totally 225 CFDST beam-columns with outer stainless steel tubes were systematically analyzed using a fiber-based model in this work. The influences of the parameter on the typical N/N_u-M/M_u curve were investigated, and the obtained curves were compared with those of CFDST members with carbon steel. Finally, the correlation curve equation of N/N_u-M/M_u was proposed. The study results showed that: the fiber-based model program developed could well predict the compression-bending capacity and the development of N/N_u-M/M_u curve of CFDST members with external stainless steel tube; the shape of N/N_u-M/M_u curve is affected by the concrete strength, by the ratio of the diameter to the thickness of the inner steel tube, by the yield strength of steel, by the hollow ratio, by the nominal steel ratio and, by slenderness ratio; due to an obvious strain-strengthening effect of stainless steel, the N/N_u-M/M_u curves of the CFDST members with external stainless steel tubes are close to the steel members when compared to those of the CFDST members with external carbon tubes; and the characteristic-point and N/N_u-M/M_u formulas for CFDST members with outer stainless steel based on the test and parametrical results were suggested by modifying the formulas used for the companion with outer carbon steel, the calculation results by the formulas modified indicate a good agreement with the program-calculated results.
- concrete filled double skin steel tube (CFDST) /
- stainless steel /
- fiber-based model /
- combined compression and bending /
- N/N_u-M/M_u curve /
- calculation method

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图 1 试件横截面图

Figure 1. Cross section diagram of specimen

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图 2 破坏模态

Figure 2. Failure patterns of specimens

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图 3 钢材应力-应变曲线

Figure 3. Stress-strain curves for steels

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图 4 截面单元划分及应变分布

Figure 4. Section discretization and strain distribution

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图 5 纤维模型法计算过程

Figure 5. Calculation process of fiber-based model

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图 6 预测与试验N-u_m曲线对比

Figure 6. Comparison of predicted and experimental N-u_m curves

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图 7 试验与程序结果对比

Figure 7. Comparison between test and program results

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图 8 N/N_u-M/M_u关系曲线

Figure 8. N/N_u-M/M_u interaction curve

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9 各参数对N/N_u-M/M_u曲线的影响

9. Effects of various parameters on N/N_u-M/M_u curves

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图 10 不锈钢和碳素钢典型σ-ε曲线

Figure 10. Typical σ-ε curves for stainless and carbon steels

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图 11 外管钢材类型对N/N_u-M/M_u曲线的影响

Figure 11. Influence of the type of outer steel tube on N/N_u-M/M_u curves

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图 12 公式与试验及程序结果的比较

Figure 12. Comparison between design method vs. test and program results

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图 13 特征点坐标对比

Figure 13. Comparison of feature point coordinate

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图 14 简化计算与程序计算的N/N_u-M/M_u 曲线对比

Figure 14. Comparison of N/N_u-M/M_u curves calculated by simplified formula and program

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表 1 钢材材料性能

Table 1. Material properties of steels

钢材类别	钢材屈服强度 σ_y/MPa	钢材极限强度 σ_u/MPa	弹性模量 E_s/MPa	伸长率 δ
碳素钢管 (2.01 mm)	275	351	2.08×10⁵	0.22
碳素钢管 (2.52 mm)	276	384	2.05×10⁵	0.25
不锈钢管 (1.88 mm)	322	703	1.91×10⁵	0.46

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表 2 试件参数

Table 2. Parameters of specimen

试件名称	外管直径×壁厚 D_o×t_o /mm	内管直径×壁厚 D_i×t_i /mm	柱长L /mm	偏心距e /mm	长细比λ
C1-0.44-4-a/b	114×1.88	48×2.52	800	4	23
C1-0.69-14-a/b	114×1.88	76×2.01	800	14	22
C2-0.44-4-a/b	114×1.88	48×2.52	1300	4	38
C2-0.69-14-a/b	114×1.88	76×2.01	1300	14	35
C3-0.44-4-a/b	114×1.88	48×2.52	1800	4	53
C3-0.69-14-a/b	114×1.88	76×2.01	1800	14	49
注：空心率χ和长细比λ根据《中空夹层钢管混凝土结构技术规程》^[20]分别取：χ= D_i/( D_o−2×t_o)和λ=4L_e / [$D_0^2 $+(D_i−2t₀)²]^1/2。

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表 3 参数取值

Table 3. Parameter values

混凝土强度 f_cu,k /MPa	外管名义屈服强度f_yo /MPa	不锈钢应变强化系数n	内管屈服强度 f_yi /MPa	径厚比D_i/t_i	含钢率α_n	空心率χ	长细比λ
40, 60, 80	210	7.4	235, 355, 420	23, 46, 69	0.06, 0.10, 0.14	0.25, 0.5, 0.75	10, 20, 40, 60, 80, 100, 150
	330	4.7
	450	5.0

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