钢管约束超高性能混凝土加固RC墩柱抗震性能

罗霞; 余昕烨; 韦建刚; 杨艳; 杨毅林

doi:10.19818/j.cnki.1671-1637.2025.05.016

钢管约束超高性能混凝土加固RC墩柱抗震性能

doi: 10.19818/j.cnki.1671-1637.2025.05.016

罗霞¹,
余昕烨¹,
韦建刚^{1, 2, ,},
杨艳^{2, 3},
杨毅林²

1.
福建理工大学土木工程学院, 福建福州 350118
2.
福州大学土木工程学院, 福建福州 350108
3.
福州大学至诚学院土木工程系, 福建福州 350002

基金项目:

国家自然科学基金项目 52278158

福建省自然科学基金项目 2022J05188

福建理工大学科技项目 GY-Z21220

福建理工大学科技项目 GY-Z20174

详细信息

作者简介:
罗霞(1990-)，女，福建龙岩人，福建理工大学副教授，工学博士，从事超高性能混凝土与钢-混凝土组合结构受力性能研究

通讯作者:
韦建刚(1971-)，男，广西上思人，福建理工大学研究员，工学博士

中图分类号: U443.22
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- 文章访问数: 56
- HTML全文浏览量: 29
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-30
- 录用日期: 2025-04-02
- 修回日期: 2025-02-28
- 刊出日期: 2025-10-28

Seismic performance of RC columns strengthened by steel tube-confined ultra-high performance concrete

LUO Xia¹,
YU Xin-ye¹,
WEI Jian-gang^{1, 2
, ,},
YANG Yan^{2, 3},
YANG Yi-lin²

1.
School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China
2.
College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China
3.
Department of Civil Engineering, Fuzhou University Zhicheng College, Fuzhou 350002, Fujian, China

Funds:

National Natural Science Foundation of China 52278158

Natural Science Foundation of Fujian Province 2022J05188

Science and Technology Projects of Fujian University of Technology GY-Z21220

Science and Technology Projects of Fujian University of Technology GY-Z20174

More Information

Corresponding author: WEI Jian-gang (1971-), male, professor, PhD, weijg@fzu.edu.cn

Article Text (Baidu Translation)

摘要

摘要: 面向高烈度地震区既有钢筋混凝土(RC)桥墩抗震性能不足的加固需求，提出了一种超高性能混凝土(UHPC)的新型钢管约束加固技术；为探究该新型加固墩柱的抗震性能，以加固类型和初始轴压比为研究参数，拟静力试验研究了5根试件的破坏模式、滞回曲线、骨架曲线及抗震性能指标；以试验结果作为验证依据，建立了能准确模拟钢管约束UHPC加固RC柱滞回性能的有限元模型，继而借助有限元对加固层的UHPC厚度、UHPC强度和钢管厚度进行了参数拓展分析。研究结果表明：RC柱经钢管约束UHPC加固后，塑性铰区减小，且集中于柱脚钢管切缝处；与UHPC增大截面加固法相比，同条件下钢管约束UHPC加固柱的位移延性系数、累计滞回耗能和初始刚度均得到更明显提高，残余变形则减小更为显著；随着初始轴压比在0~0.3范围增大，钢管约束UHPC加固柱的破坏模式、承载力和耗能能力等无明显变化，但位移延性系数和初始刚度有所减小，残余位移趋于增大；提高加固层UHPC的强度，可明显提升加固柱的耗能能力；增加加固层钢管的厚度，则有利于显著减小加固柱的残余位移；增大加固层UHPC的厚度，加固柱的承载力、位移延性系数、累计滞回耗能和初始刚度均有明显提高，同时其残余位移显著减小。以上研究成果可为钢管约束UHPC预防性抗震加固既有RC墩柱的应用奠定理论基础。
- 桥梁工程 /
- 抗震性能 /
- 拟静力试验 /
- 加固 /
- 钢筋混凝土柱 /
- 钢管约束混凝土 /
- 超高性能混凝土
Abstract: To address the seismic retrofitting demand for existing reinforced concrete (RC) bridge piers in high-intensity seismic regions, a novel strengthening technique using steel tube-confined ultra-high performance concrete (UHPC) was proposed. To investigate the seismic performance of the newly strengthened piers, quasi-static tests were conducted on five specimens, with strengthening type and initial axial load ratio as parameters. Failure modes, hysteretic curves, skeleton curves, and seismic performance indices were measured. Then, based on the experimental results, a finite element model was built to accurately simulate the quasi-static behavior of the strengthened columns. Subsequently, parametric analyses were carried out using finite element simulations, considering the UHPC layer thickness, UHPC strength, and steel tube thickness. Research results show that after strengthening with steel tube-confined UHPC, the plastic hinge region of the RC columns was reduced and concentrated near the cut in the steel tube at the column base. Compared with the UHPC section enlargement method, the steel tube-confined UHPC strengthening technique provides greater improvement in displacement ductility coefficient, cumulative hysteretic energy dissipation, and initial stiffness, along with a more significant reduction in residual deformation under the same conditions. As the initial axial load ratio increases within the range of 0 - 0.3, the failure mode, bearing capacity, and energy dissipation capacity remain largely unchanged. However, displacement ductility and initial stiffness decrease, and residual displacement tends to increase. Increasing the UHPC strength in the strengthening layer significantly improves the energy dissipation capacity. Increasing the thickness of the steel tube in the strengthening layer significantly reduces the residual displacement. Increasing the UHPC thickness in the strengthening layer enhances bearing capacity, displacement ductility, cumulative hysteretic energy dissipation, and initial stiffness, while also markedly reducing residual displacement. These findings are expected to provide a theoretical basis for the application of steel tube-confined UHPC in the preventive seismic strengthening of existing RC bridge piers.
- bridge engineering /
- seismic performance /
- quasi-static test /
- strengthening /
- reinforced concrete column /
- steel tube-confined concrete /
- ultra-high performance concrete

HTML全文

图 1 试件横截面示意(单位：mm)

Figure 1. Schematic of cross-section of specimen (unit: mm)

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图 2 基准试件设计尺寸(单位：mm)

Figure 2. Design size of standard specimen (unit: mm)

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图 3 钢材材性曲线

Figure 3. Steel material curves

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图 4 试件测点布置(单位：mm)

Figure 4. Measuring point arrangements of specimens (unit: mm)

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图 5 试验加载装置

Figure 5. Test loading setup

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图 6 试验加载制度

Figure 6. Experimental loading protocol

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图 7 试件的破坏形态

Figure 7. Failure modes of specimens

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图 8 荷载-位移滞回曲线

Figure 8. Load-displacement hysteretic curves

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图 9 荷载-位移骨架曲线

Figure 9. Load-displacement skeleton curves

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图 10 纵筋应变-位移曲线

Figure 10. Strain-displacement curves of longitudinal reinforcement

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图 11 箍筋应变-位移曲线

Figure 11. Strain-displacement curves of stirrups

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图 12 钢管应变-位移曲线

Figure 12. Strain-displacement curves of steel tubes

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图 13 位移延性系数对比

Figure 13. Comparison of displacement ductility coefficients

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图 14 累积滞回耗能对比

Figure 14. Comparison of cumulative hysteretic energy dissipation

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图 15 刚度退化

Figure 15. Stiffness degradation

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图 16 残余位移与加载位移的关系曲线

Figure 16. Relationship curves between residual displacement and loading displacement

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图 17 钢管约束UHPC加固RC柱有限元模型

Figure 17. Finite element model of RC columns strengthened by steel tube-confined UHPC

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图 18 有限元模型结果和试验结果的曲线对比

Figure 18. Comparison of curves between finite element model results and experimental results

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图 19 模型结果和试验结果的混凝土损伤对比(STURC-0)

Figure 19. Comparison of concrete damage between model results and experimental results (STURC-0)

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图 20 UHPC强度对钢管约束UHPC加固柱抗震性能的影响

Figure 20. Effect of UHPC strength on seismic performance of steel tube-confined UHPC strengthened columns

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图 21 UHPC厚度对钢管约束UHPC加固柱抗震性能的影响

Figure 21. Influence of UHPC thickness on seismic performance of steel tube-confined UHPC strengthened columns

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图 22 钢管厚度对钢管约束UHPC加固柱抗震性能的影响

Figure 22. Influence of steel tube thickness on seismic performance of steel tube-confined UHPC strengthened columns

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表 1 试件主要参数

Table 1. Main parameters of test specimens

试件编号	外径/mm	f_c2/MPa	t/mm	n_l	加载轴压力/kN	n_o	初始轴压力/kN
RC-0	150			0.3	141	0.00	0
URC-0	240	128.8		0.3	921	0.00	0
STURC-0	240	128.8	4	0.3	1 068	0.00	0
STURC-0.15	240	128.8	4	0.3	1 068	0.15	68
STURC-0.30	240	128.8	4	0.3	1 068	0.30	148

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表 2 混凝土配合比

Table 2. Mix design of concrete kg·m^-3

C30	水泥	粉煤灰	减水剂	石子	机制砂	水
C30	360	65	7.5	1 110	365	160
UHPC	水泥	硅灰	石英砂	高效减水剂	水	钢纤维
UHPC	860	258	1 007	22	179	157

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表 3 钢材材性

Table 3. Steel material properties

钢材类型	弹性模量E_s/GPa	屈服强度f_y/MPa	极限强度f_u/MPa	断后伸长率/%
Q355钢管	208	338	548	22.07
HRB400纵筋	210	453	595	23.14
HPB235箍筋	206	238	424	29.81

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表 4 混凝土本构相关参数

Table 4. Parameters related to concrete constitutive behaviors

材料类型	塑性参数						受拉本构关系
材料类型	膨胀角/(°)	偏心率	f_b0/f_c0	K	黏性系数	峰值拉应力/MPa	断裂能/(10⁶ J·mm^-2)
C30	41.19	0.1	1.156	0.724	0.005	3.2	0.062 7
UHPC	41.19	0.1	1.042	0.698	0.005	13.5	0.174 9

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