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

Received： 2025-1-10

Revised： 2024-12-24

Online： 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