钢管混凝土-FRP管海水海砂混凝土组合柱轴压模型

缪坤廷; 魏洋; 朱超; 丁明珉; 郑开启

doi:10.13801/j.cnki.fhclxb.20211206.003

钢管混凝土-FRP管海水海砂混凝土组合柱轴压模型

doi: 10.13801/j.cnki.fhclxb.20211206.003

南京林业大学　土木工程学院，南京 210037

基金项目: 江苏省研究生科研与实践创新计划(KYCX21_0880)；国家自然科学基金(51778300)；江苏省自然科学基金(BK20191390)；江苏省重点研发计划(BE2020703)；江苏省六大人才高峰项目(JZ-017)；江苏省高校“青蓝工程”项目(2020)

详细信息

通讯作者:
魏洋，博士，教授，博士生导师，研究方向为约束混凝土结构　E-mail:wy78@njfu.edu.cn

中图分类号: U445.7
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出版历程
- 收稿日期: 2021-11-02
- 修回日期: 2021-11-19
- 录用日期: 2021-11-30
- 网络出版日期: 2021-12-07
- 刊出日期: 2022-11-01

Model for stress-strain curves of concrete filled steel tube-seawater and sea sand concrete filled FRP tube composite columns under axial load

College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China

摘要

摘要: 提出一种钢管混凝土-纤维增强复合材料(FRP)管海水海砂混凝土(SWSSC)组合柱新型结构，其由外侧钢管、夹层普通混凝土、内侧FRP管和核心SWSSC构成。在轴向荷载作用下，夹层普通混凝土受到钢管的约束，而核心SWSSC受到钢管和FRP管的共同约束，考虑到两部分混凝土的不同约束机制，在现有的FRP-钢复合管约束混凝土的计算模型的基础上，本文提出了钢管混凝土-FRP管SWSSC组合柱的峰值点和极限点的计算模型；并利用FRP-钢复合管约束混凝土的应力-应变曲线模型，得到了钢管混凝土-FRP管SWSSC组合柱的应力-应变预测曲线；在72个钢管混凝土-FRP管SWSSC组合柱的轴压试验结果的基础上，对建议的模型进行了验证与评估。结果表明，提出的模型可以较好地预测钢管混凝土-FRP管SWSSC组合柱的应力-应变曲线。最后，利用提出的应力-应变曲线模型对钢管混凝土-FRP管SWSSC组合柱的轴压性能进行了参数化分析。
- FRP管 /
- 钢管混凝土柱 /
- 海水海砂混凝土 /
- 单调轴压 /
- 计算模型
Abstract: A novel structure termed as concrete filled steel tube-seawater and sea sand concrete (SWSSC) filled fiber reinforced polymer (FRP) tube composite columns was proposed, which was composed of outer steel tube, sandwiched ordinary concrete, inner FRP tube and core SWSSC. The sandwiched ordinary concrete was confined by the outer steel tube, while the core SWSSC was confined by both steel tube and FRP tube under axial compression. Considering the different confinement mechanism of two kinds of concrete, the calculation models of peak point and ultimate point of concrete filled steel tube-SWSSC filled FRP tube composite columns were proposed based on the existing calculation model of concrete-filled FRP-steel composite tube columns. And the predicted stress-strain curve model was obtained by using the stress-strain curve model of concrete-filled FRP-steel compo-site tube columns. The proposed model was verified and evaluated on the basis of the existing test results. The results show that the proposed model can predict the stress-strain curve of concrete filled steel tube-SWSSC filled FRP tube composite columns well. Finally, based on the proposed stress-strain model, the axial compression behavior of concrete filled steel tube-SWSSC filled FRP tube composite columns with different parameters was analyzed.
- FRP tube /
- concrete-filled steel tube /
- seawater and sea sand concrete /
- monotonic axial compression /
- calculation model

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图 1 钢管混凝土-纤维增强复合材料(FRP)管海水海砂混凝土(SWSSC)组合柱试件示意图

Figure 1. Schematic diagram of concrete filled steel tube-seawater and sea sand concrete (SWSSC) filled fiber reinforced polymer (FRP) tube composite columns

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图 2 钢管混凝土-FRP管SWSSC组合柱约束机制分析图

Figure 2. Analysis diagram of confinement mechanism for concrete filled steel tube-SWSSC filled FRP tube composite columns

P—Axial load; f_lf—Confining pressure provided by FRP tube; f_ls—Confining pressure provided by the steel tube; σ_a—Axial stress of steel tube; A_s—Sectional area of steel tube; f_co1—Compressive strength of sandwiched concrete; A_c1—Sectional area of sandwiched concrete; f_co2—Compressive strength of core concrete; A_c2—Sectional area of core concrete

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图 3 钢管混凝土-FRP管SWSSC组合柱典型应力-应变曲线

Figure 3. Typical stress-strain curves of concrete filled steel tube-SWSSC filled FRP tube composite columns

f_cu—Ultimate stress of specimens; f_cc—Peak stress of specimens; ε_cu—Ultimate strain of specimens; ε_cc—Peak strain of specimens

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图 4 部分钢管混凝土-FRP管SWSSC组合柱试件的试验过程及破坏模式

Figure 4. Test process and failure modes of concrete filled steel tube-SWSSC filled FRP tube composite column specimens

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图 5 钢管混凝土-FRP管SWSSC组合柱极限点模型评估

Figure 5. Evaluation of ultimate point model for concrete filled steel tube-SWSSC filled FRP tube composite columns

A—Average of theoretical value to experiment value ratio; S—Standard deviation; E—Absolute average error

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图 6 钢管混凝土-FRP管SWSSC组合柱峰值点模型评估

Figure 6. Evaluation of peak point model for concrete filled steel tube-SWSSC filled FRP tube composite columns

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图 7 钢管混凝土-FRP管SWSSC组合柱计算流程图

Figure 7. Flow chart of model calculation for concrete filled steel tube-SWSSC filled FRP tube composite columns

E_cs—Initial stiffness of stress-strain curves (i.e. the slope of initial stage of stress-strain curves); E_sec—Second stiffness of stress-strain curves (i.e. the slope of second linear strengthening stage of stress-strain curves); x_n—nth iteration point

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图 8 钢管混凝土-FRP管海水海砂混凝土组合柱应力-应变曲线模型验证

Figure 8. Verification of stress-strain curves model for concrete filled steel tube-SWSSC filled FRP tube composite columns

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图 9 钢管混凝土-FRP管SWSSC组合柱参数化分析

Figure 9. Parametric analysis of concrete filled steel tube-SWSSC filled FRP tube composite columns

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表 1 钢管混凝土-FRP管SWSSC组合柱试件的具体参数

Table 1. Detailed parameters of concrete filled steel tube-SWSSC filled FRP tube composite columns

Specimens	Steel thickness/ mm	FRP tube diameter/ mm	FRP tube layers	FRP tube numbers	Specimens	Steel thickness/ mm	FRP tube diameter/ mm	FRP tube layers	FRP tube numbers
S4.5D70IC2	4.5	70	2	1	S4.5D35IIIC2	4.5	35	2	3
S4.5D70IC3	4.5	70	3	1	S4.5D35IIIC3	4.5	35	3	3
S4.5D70IC4	4.5	70	4	1	S4.5D35IIIC4	4.5	35	4	3
S4.5D90IC2	4.5	90	2	1	S4.5D45IIIC2	4.5	45	2	3
S4.5D90IC3	4.5	90	3	1	S4.5D45IIIC3	4.5	45	3	3
S4.5D90IC4	4.5	90	4	1	S4.5D45IIIC4	4.5	45	4	3
S4.5D110IC2	4.5	110	2	1	S4.5D55IIIC2	4.5	55	2	3
S4.5D110IC3	4.5	110	3	1	S4.5D55IIIC3	4.5	55	3	3
S4.5D110IC4	4.5	110	4	1	S4.5D55IIIC4	4.5	55	4	3
S6.0D70IC2	6.0	70	2	1	S6.0D35IIIC2	6.0	35	2	3
S6.0D70IC3	6.0	70	3	1	S6.0D35IIIC3	6.0	35	3	3
S6.0D70IC4	6.0	70	4	1	S6.0D35IIIC4	6.0	35	4	3
S6.0D90IC2	6.0	90	2	1	S6.0D45IIIC2	6.0	45	2	3
S6.0D90IC3	6.0	90	3	1	S6.0D45IIIC3	6.0	45	3	3
S6.0D90IC4	6.0	90	4	1	S6.0D45IIIC4	6.0	45	4	3
S6.0D110IC2	6.0	110	2	1	S6.0D55IIIC2	6.0	55	2	3
S6.0D110IC3	6.0	110	3	1	S6.0D55IIIC3	6.0	55	3	3
S6.0D110IC4	6.0	110	4	1	S6.0D55IIIC4	6.0	55	4	3
Notes: Labels of the specimens are as follows: The first letter “S” denotes steel tube, the second number such as “6.0” denotes the thickness of the steel tube; the second letter and number such as “D90” denotes the diameter of the FRP tube; the number “I” denotes the number of the FRP tube; the third letter and number such as “C2” denotes the number of FRP layers. For example, “S6.0D55IIIC3” indicates that the thickness of the steel tube is 6.0 mm, diameter of the FRP tube is 55 mm, the number of FRP tube is 3, and number of layers of the FRP tube is 3.

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表 2 钢管混凝土-FRP管SWSSC组合柱参数变化的影响

Table 2. Influence of parameter variation of concrete filled steel tube-SWSSC filled FRP tube composite columns

Specimens	Two-layers		Four-layers		Six-layers		Eight-layers		Ten-layers
Specimens	Ultimate stress/MPa	Increase ratio/%	Ultimate stress/MPa	Increase ratio/%	Ultimate stress/MPa	Increase ratio/%	Ultimate stress/MPa	Increase ratio/%	Ultimate stress/MPa	Increase ratio/%
S4.5D80	100.62	−	120.64	−	141.30	−	162.61	−	184.59	−
S4.5D90	103.01	2.37	125.40	3.95	148.44	5.06	172.13	5.86	196.49	6.45
S4.5D100	105.39	2.31	130.16	3.80	155.58	4.81	181.66	5.53	208.39	6.06
S4.5D110	107.77	2.26	134.93	3.66	162.73	4.59	191.18	5.24	220.30	5.71
S4.5D120	110.15	2.21	139.69	3.53	169.88	4.39	200.71	4.98	232.21	5.41
S4.5D130	112.53	2.16	144.46	3.41	177.02	4.21	210.24	4.75	244.12	5.13
S6.0D80	121.11	−	141.23	−	162.01	−	183.44	−	205.54	−
S6.0D90	123.50	1.98	146.02	3.39	169.19	4.44	193.02	5.22	217.51	5.82
S6.0D100	125.90	1.94	150.81	3.28	176.38	4.25	202.60	4.96	229.49	5.51
S6.0D110	128.29	1.90	155.61	3.18	183.57	4.08	212.19	4.73	241.47	5.22
S6.0D120	130.69	1.87	160.40	3.08	190.76	3.92	221.78	4.52	253.45	4.96
S6.0D130	133.09	1.83	165.19	2.99	197.95	3.77	231.36	4.32	265.44	4.73
Notes: The labels of the specimens are as follows: the first letter “S” denotes steel tube, the second number such as “6.0” denotes the thickness of the steel tube; the second letter and number such as “D90” denotes the diameter of the FRP tube. For example, “S6.0D90” indicates that the thickness of the steel tube is 6.0 mm, diameter of the FRP tube is 90 mm.

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