Bending performance of precast segmental beams with external pressed tendons and joint dovetail connection

doi:10.3969/j.issn.1000-1565.2025.04.003

Abstract

Abstract: Aiming at the structural characteristics of externally prestressed precast segmental beams disconnected at the joints, the dovetail joint connection of local joints of this kind of beams is put forward,and the study on bending performance of the external prestressed precast segmental test beam connected by the dovetail is carried out. Observing the test phenomenon, summarizing the damage mode, analyzing the load-deflection curve, prestress change curve and the change rule of joint opening width along the beam height, it reveals the damage mechanism of the dovetail joint structure design of externally prestressed precast segmental beams. The results show that the precast segmental beam with joint connection has good ductility, which increases the strength of the precast segmental beam and achieves the characteristics of multi-stage failure; In the ultimate bearing capacity state, dovetail joint connection improves the resistance strength of the compression zone at joints, and the ultimate bearing capacity of beams is greater; The joint width at the open joint is linearly distributed along the beam height, and the average strain conforms to the assumption of flat section;The finite element model of externally prestressed precast segmental beam with joint dovetail connection is established and compared with the actual test. The numerical simulation results are in good agreement with the test results. - DOI:10.3969/j.issn.1000-1565.2025.04.003燕尾榫连接接缝的体外预应力预制节段梁受弯性能袁爱民¹,余京浩¹,李维生²,侯达¹,陈琦¹,王玺¹(1.河海大学土木与交通学院, 江苏南京 210098;2.中交第二公路工程局有限公司, 陕西西安 710065)摘要:针对体外预应力预制节段梁在接缝处断开导致的结构性能退化问题,提出了此类梁接缝局部连接的燕尾榫连接构造设计,并对燕尾榫连接的体外预应力预制节段试验梁进行了受弯性能试验研究.观察试验现象,总结破坏模式,分析荷载挠度曲线,预应力变化曲线以及接缝张开宽度沿梁高变化规律,揭示了燕尾榫连接构造设计体外预应力节段梁的破坏机理.研究结果表明:设置燕尾榫接缝连接方式的预制节段梁具有良好的延性,增加了预制节段梁的强度,具有多级破坏的特征;极限承载力状态时,燕尾榫连接提高了接缝处受压区抵抗强度,梁体极限承载力更大;张开接缝处的接缝宽度沿梁高呈线性分布,虚拟平均应变符合平截面假定;建立了接缝燕尾榫连接的体外预应力预制节段梁的有限元模型,并与试验进行了对比,数值模拟结果与试验结果符合较好.关键词:预制节段梁;接缝局部连接;体外预应力束;破坏模式;极限承载力中图分类号:U433.35 文献标志码:A 文章编号:1000-1565(2025)04-0352-09Bending performance of precast segmental beams with external pressed tendons and joint dovetail connectionYUAN Aimin¹,YU Jinghao¹, LI Weisheng², HOU Da¹, CHEN Qi¹, WANG Xi¹(1. School of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;2. CCCC Second Highway Engineering Co., Ltd., Xian 710065, China )Abstract: Aiming at the structural characteristics of externally prestressed precast segmental beams disconnected at the joints, the dovetail joint connection of local joints of this kind of beams is put forward,and the study on bending performance of the external prestressed precast segmental test beam connected by the dovetail is carried out. Observing the test phenomenon, summarizing the damage mode, analyzing the load-deflection curve, prestress change curve and the change rule of joint opening width along the beam height, it reveals the damage mechanism of the dovetail joint structure design of externally prestressed precast segmental beams. The results show that the precast segmental beam with joint connection has good ductility, which increases the strength of the precast segmental beam and achieves the characteristics of multi-stage failure; In the ultimate bearing capacity state, dovetail joint connection improves the resistance strength of the compression zone at joints, and the ultimate bearing capacity of beams is greater; The joint width at the open joint is linearly distributed along the beam height, and the average strain conforms to the assumption of flat section;The finite element model of externally prestressed precast segmental beam with joint dovetail connection is established and compared with the actual test. The numerical simulation results are in good agreement with the test results. - 收稿日期:2024-05-02;修回日期:2024-09-18 基金项目:国家自然科学基金项目(51878250);江苏省研究生科研创新计划项目(KYCX23_0698) 第一作者:袁爱民(1974—),男,河海大学教授,博士,主要从事桥梁工业化智能建造技术与理论研究.E-mail:yuanam@163.com第4期袁爱民等:燕尾榫连接接缝的体外预应力预制节段梁受弯性能河北大学学报(自然科学版) 第45卷

Key words: concrete precast segmental beams, partial connection of joints, external prestressed tendons, damage modes, ultimate bearing capacity

CLC Number:

U433.35

YUAN Aimin,YU Jinghao, LI Weisheng, HOU Da, CHEN Qi, WANG Xi. Bending performance of precast segmental beams with external pressed tendons and joint dovetail connection[J]. Journal of Hebei University(Natural Science Edition), 2025, 45(4): 352-360.

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