高强钢丝布增强UHPC约束混凝土柱轴压性能

邓宗才; 王天宇

doi:10.3969/j.issn.0258-2724.20230096

高强钢丝布增强UHPC约束混凝土柱轴压性能

doi: 10.3969/j.issn.0258-2724.20230096

北京工业大学城市与工程防灾减灾省部共建教育部重点实验室，北京 100124

基金项目: 北京市教委科技重点项目（KZ201810005008）

详细信息

作者简介:
邓宗才（1961—），男，教授，博士，研究方向为超高性能混凝土及其结构，E-mail：dengzc@bjut.edu.cn

中图分类号: TU375.3
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出版历程
- 收稿日期: 2023-03-07
- 修回日期: 2023-04-10
- 网络出版日期: 2024-10-18

Axial Compression Performance of Concrete Columns Confined by Ultra-High Performance Concrete Reinforced with High-Strength Steel Wire Cloth

The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要

摘要:
为掌握新型高强钢丝布增强超高性能混凝土（UHPC）的约束效应，研究高强钢丝布面密度和层数变化对约束混凝土柱轴压性能的影响规律. 首先，利用混凝土泊松比、延性指数和韧性指数对高强钢丝布增强UHPC的约束效应进行评估；其次，考虑高强钢丝布与UHPC提供的约束力，建立复合约束层的侧向约束力模型；最后，基于Ottosen破坏准则和有效约束指标，建立约束混凝土轴压本构模型. 研究结果表明：约束柱受压时呈明显的延性破坏，高强钢丝布增强UHPC约束体系可有效抑制裂缝发展，减缓加载后期试件刚度退化；与未约束柱相比，约束柱的极限承载力、峰值压应变和峰值应力的最大增幅分别为147%、104%和58%；当高强钢丝布层数从1层增加至2层，面密度增加至3.3倍时，约束柱极限承载力、峰值压应变和峰值应力分别提高了8.4%、29.3%和15.8%，延性指数和韧性指数分别提高了50.3%和44.2%. 对比经典约束混凝土轴压本构模型，本文建立的模型与试验结果吻合度较高.
- 高强钢丝布 /
- 轴压性能 /
- 超高性能混凝土 /
- 约束混凝土 /
- 本构模型
Abstract:
In order to master the constraint effect of new high-strength steel wire cloth reinforced ultra-high performance concrete (UHPC), a study was conducted on the influence of the surface density and number of layers of high-strength steel wire cloth on the axial compression performance of confined concrete columns. Firstly, the constraint effect of high-strength steel wire cloth reinforced UHPC was evaluated using Poisson’s ratio, ductility index, and toughness index. Secondly, a lateral constraining force model of the composite constraining layer was established considering the constraining force provided by high-strength steel wire cloth and UHPC. Finally, a constitutive model of axial compression of confined concrete was established based on the Ottosen failure criterion and an effective constraint index. The results show that the confined column exhibits obvious ductile failure under compression, and the high-strength steel wire cloth reinforced UHPC confinement system can effectively suppress crack development and slow down the stiffness degradation of the specimen in the later stage of loading. Compared with the unconfined column, confined columns have maximum increases of 147%, 104%, and 58% in ultimate bearing capacity, peak compressive strain, and peak stress, respectively. When the number of layers of high-strength steel wire cloth increases from 1 to 2, and the surface density increases to 3.3 times, the ultimate bearing capacity, peak compressive strain, and peak stress of the confined column increase by 8.4%, 29.3%, and 15.8%, respectively, while the ductility index and toughness index increase by 50.3% and 44.2%, respectively. The model established in this paper highly agrees with the experimental results compared with the classical constitutive model of axial compression of confined concrete.
- high-strength steel wire cloth /
- axial compression performance /
- ultra-high performance concrete /
- confined concrete /
- constitutive model

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图 1 HSWU约束混凝土柱示意

Figure 1. Design details of HSWU restrained concrete columns

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图 2 高强钢丝布

Figure 2. High-strength steel wire cloth

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图 3 约束材料应力-应变曲线

Figure 3. Stress-strain curves of confining materials

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图 4 轴心抗压试验装置

Figure 4. Axial compression test apparatus

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图 5 试件破坏形态

Figure 5. Failure mode of the specimens

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图 6 实测HSWU约束混凝土柱荷载-轴向应变全曲线

Figure 6. Load-axial strain measurement curves of concrete columns confined by HSWU

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图 7 约束柱典型荷载-轴向应变曲线特征

Figure 7. Characteristics of typical load-axial strain curve of confined column

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图 8 中截面荷载-组合材料泊松比关系

Figure 8. Relationships between load at middle section and Poisson’s ratio of concrete columns

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图 9 延性指数、韧性指数计算模型

Figure 9. Calculation models of ductility index and toughness index

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图 10 HSWU约束混凝土核心区应力-应变曲线

Figure 10. Stress-strain curves for the core of HSWU restrained concrete

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图 11 面密度对HSWU约束混凝土柱应力-应变曲线影响

Figure 11. Effect of surface density on the stress-strain curves of HSWU restrained concrete columns

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图 12 层数对HSWU约束混凝土应力-应变曲线影响

Figure 12. Effect of number of layers on the stress-strain curves of HSWU restrained concrete columns

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图 13 HSWU约束混凝土柱截面受力分析

Figure 13. Section force analysis of HSWU restrained concrete columns

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图 14 f_cc/f_co-f_l/f_co关系曲线

Figure 14. Relationship between f_cc/f_co and f_l/f_co

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图 15 ε_cc/ε_co-f_l/f_co关系曲线

Figure 15. Relationship between ε_cc/ε_co and f_l/f_co

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图 16 ε₇₀/ε_co-f_l/f_co关系曲线

Figure 16. Relationship between ε₇₀/ε_co and f_l/f_co

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图 17 各模型应力-应变曲线的对比

Figure 17. Comparison of stress-strain curves of different models

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表 1 HSWU混凝土柱设计参数

Table 1. Design parameters of HSWU concrete columns

组号	试件编号	面密度/（g·m⁻²）
1	G600S1	600
1	G600S2	600
2	G1200S1	1200
2	G1200S2	1200
3	G2000S1	2000
3	G2000S2	2000
4	G0S0

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表 2 UHPC配合比

Table 2. Mix proportions of UHPC kg/m³

水泥	硅灰	矿粉	砂子/目			玻璃纤维	水	减水剂
水泥	硅灰	矿粉	(10,20]	(20,40]	(40,70]	玻璃纤维	水	减水剂
646	108	322	457	303	316	39	172	10

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表 3 短纤维性能参数

Table 3. Performance parameters of the short fiber

纤维种类	长度/ mm	抗拉强度/MPa	密度/ （kg·m⁻³）	弹性模量/GPa	直径/ mm
玻璃纤维	18	1700	2600	72	0.014

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表 4 混凝土抗压试验结果平均值

Table 4. Average value of concrete compression test results

混凝土强度	f_cu/MPa	f_co/MPa	E_c/GPa
C60	60.8	39.8	35.8

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表 5 UHPC抗压、抗拉试验结果平均值

Table 5. Average value of UHPC compression and tensile test results

f_cu,u/MPa	f_co,u/MPa	E_u/GPa	f_t,u/MPa	ε_tu,max/%
113.2	84.07	40.1	6.85	0.18

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表 6 HSWU约束混凝土柱延性指数和韧性指数

Table 6. Ductility index and toughness index of HSWU restrained concrete columns

试件编号	延性指数	韧性指数
G0S0
G600S1	5.81	0.52
G600S2	6.32	0.65
G1200S1	7.17	0.69
G1200S2	8.41	0.73
G2000S1	7.69	0.71
G2000S2	8.73	0.75

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表 7 HSWU约束混凝土柱轴压试验试验结果

Table 7. Axial compression test results of HSWU restrained concrete columns

试件编号	F_max（F₀）/kN	F_max/F₀	ε_cu（ε_co）	ε_cu/ε_co	ε_tu	f_cc/MPa	f_cc/f_co	ε_cc	ε₇₀
G0S0	1130		0.0026
G600S1	2576	2.28	0.0041	1.58	0.0034	54.27	1.36	0.0046	0.0065
G600S2	2641	2.34	0.0047	1.81	0.0035	57.07	1.43	0.0049	0.0083
G1200S1	2595	2.30	0.0043	1.65	0.0034	56.85	1.43	0.0048	0.0091
G1200S2	2743	2.43	0.0052	2.00	0.0037	61.36	1.54	0.0057	0.0145
G2000S1	2617	2.32	0.0044	1.69	0.0035	57.64	1.45	0.0051	0.0119
G2000S2	2792	2.47	0.0053	2.04	0.0037	62.85	1.58	0.0063	0.0183
注：F₀和ε_co分别为未约束试件峰值荷载和峰值轴向应变，ε_tu为约束试件峰值荷载时的横向应变，f_cc和ε_cc分别为HSWU约束混凝土核心区峰值应力和峰值应变，ε₇₀为HSWU约束混凝土核心区峰值应力下降30%时所对应的轴向应变.

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高强钢丝布增强UHPC约束混凝土柱轴压性能

doi: 10.3969/j.issn.0258-2724.20230096

作者简介: 邓宗才（1961—），男，教授，博士，研究方向为超高性能混凝土及其结构，E-mail：dengzc@bjut.edu.cn

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Axial Compression Performance of Concrete Columns Confined by Ultra-High Performance Concrete Reinforced with High-Strength Steel Wire Cloth

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出版历程

目录

作者简介:
邓宗才（1961—），男，教授，博士，研究方向为超高性能混凝土及其结构，E-mail：dengzc@bjut.edu.cn