高联斌，周敉，马雷,等. 预制装配式桥墩UHPC湿接缝抗剪性能研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2024110026.

GAO L B, ZHOU M, MA L, et al． Research on Shear Performance of UHPC Wet Joints in Assembled Segmental Column [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787.2024110026.

预制装配式桥墩UHPC湿接缝抗剪性能研究(网络首发)

高联斌1，周敉2，马雷3，贺永健2，王帅4

1. 山西黎霍高速公路有限公司，山西 长治 046200；2. 长安大学 旧桥检测与加固技术交通行业重点实验室，陕西 西安 710064；3. 中交第二公路工程局有限公司，陕西 西安 710064；4.陕西省交通规划设计研究院有限公司，陕西 西安 710065

摘要: 目的 为了解决预制装配式桥墩节段间湿接缝的可靠性问题，探寻合理的连接接缝构造形式，保证预制装配式桥墩结构在实际工程中的可靠性。方法 本文以预制桥墩节段间超高性能混凝土（ultrahigh performance concrete，UHPC）湿接缝作为研究对象，以接缝类型、键齿数量、约束正应力以及穿筋情况作为影响因素，设计了9个UHPC湿接缝模型试件，并完成了试件的直接剪切试验。之后，采用ABAQUS软件建立了有限元模型，并对UHPC湿接缝的抗剪性能进行了数值模拟研究，在此基础上，本文又以UHPC的抗压强度和抗拉强度这两种主要的影响因素为变量，进行了有限元模型的参数化分析。结果 UHPC湿接缝试件破坏形态主要为湿接缝处混凝土剪切破坏；随着约束正应力从0MPa增加到3MPa，试件破坏荷载从152kN增加到565kN，当键齿数量从0键齿增加到双键齿时，破坏荷载从308kN增加到505kN，设置纵向钢筋能够使试件破坏荷载从152kN增加到523kN；试验的破坏荷载值与有限元计算值之比为0.91~0.98，破坏时竖向位移之比则为1.06~1.30，计算值与实测值较为接近；当UHPC抗压强度从130MPa增加到200MPa时，有限元模型破坏荷载从398kN增加到了430.3kN，而UHPC抗拉强度从5.6MPa增加到10MPa时，破坏荷载则从398kN增加到了472.8kN。结论 试件抗剪承载力与约束正应力及键齿数量呈正比关系，纵向钢筋的设置对UHPC湿接缝抗剪性能的贡献十分显著，能够提高湿接缝连接的整体性。UHPC抗压强度和抗拉强度的增大亦能提高试件的抗剪承载力，因此，该研究成果能够为UHPC湿接缝在预制装配式桥墩节段中的应用提供参考。

关键词: 预制装配式桥墩；UHPC湿接缝；直剪试验；抗剪性能；有限元分析

doi: 10.16186/j.cnki.1673-9787. .2024110026

基金项目: 国家自然科学基金面上项目（51978062）；陕西省重点研发计划项目（2024SF-YBXM-644）；山西省交通科技项目（2021-02-03）；陕西省交通科研项目（22-05K）

收稿日期：2025-1-10

修回日期：2024-12-24

网络首发日期：2026-04-27

Research on shear performance of UHPC wet joints in assembled segmental column (online)

GAO Lianbin¹,，ZHOU Mi²， MA lei³，HE Yongjian²，WANG Shuai⁴

1. Shanxi Lihuo Expressway Co., Ltd., Changzhi 046200, Shanxi, China; 2. Key Laboratory for Old Bridge Detection and Reinforcement Technology of the Ministry of Transportation, Chang'an University, Xi'an 710064, Shaanxi, China; 3.CCCC Second Highway Engineering Bureau Co., Ltd, Xi'an 710064, Shaanxi, China; 4.Shaanxi Provincial Transport Planning Design and Research Institute Co., Ltd. , Xi'an 710065 , Shaanxi, China

Abstract: Objectives In order to solve the reliability problem of wet joints between prefabricated and assembled bridge pier segments, explore reasonable connection joint construction forms, and ensure the reliability of prefabricated and assembled bridge pier structures in practical engineering, Methods The wet joint of ultra-high performance concrete (UHPC) between prefabricated bridge pier segments was taken as the research object of this article, the joint type, number of key teeth, restrained normal stress, and reinforcement situation were taken as the influencing factors of the experiment, nine UHPC wet joint model specimens were designed, and direct shear tests were conducted on the specimens. Afterwards, finite element models were established using ABAQUS software, and numerical simulation studies were conducted on the shear performance of UHPC wet joints. Based on this, parametric analysis of the finite element model using the compressive strength and tensile strength of UHPC as the main influencing factors was conducted in this paper. Results The main failure mode of UHPC wet joint specimens was shear failure of concrete at the wet joint; The failure load of the specimen increased from 152kN to 565kN as the constrained normal stress increased from 0MPa to 3MPa. The failure load increased from 308kN to 505kN when the number of key teeth increased from 0 to double bond teeth. Setting longitudinal steel bars could increase the failure load of the specimen from 152kN to 523kN; The ratio of the failure load value of the experiment to the finite element calculation value was 0.91~0.98, and the ratio of the vertical displacement during failure was 1.06~1.30. The calculated value was close to the measured value.; The failure load of the finite element model increased from 398kN to 430.3kN when the compressive strength of UHPC increased from 130MPa to 200MPa, while when the tensile strength of UHPC increased from 5.6MPa to 10MPa, the failure load increased from 398kN to 472.8kN. Conclusions The shear bearing capacity of the specimen is directly proportional to the restrained normal stress and the number of key teeth. The setting of longitudinal steel bars has a significant contribution to the shear performance of UHPC wet joints, which can improve the integrity of the wet joint connection. The increase in compressive strength and tensile strength of UHPC can also improve the shear bearing capacity of specimens. Therefore, the research results can provide reference for the application of UHPC wet joints in prefabricated bridge pier segments.

Key words: assembled segmental column; UHPC wet joint; shear test; shear behavior; finite element analysis