论文标题：Analytical study on the mechanical behavior of longitudinal joints in shield tunnel strengthened by a steel ultra-high performance concrete composite

期刊：Frontiers of Structural and Civil Engineering

作者：Renpeng CHEN, Meng FAN, Hongzhan CHENG, Huaina WU, Yang ZHANG, Binyong GAO

发表时间：12 Aug 2024

DOI：10.1007/s11709-025-1150-2

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爱思唯尔2024中国高被引作者

陈仁朋

教授，博士生导师

湖南大学

引用格式

Renpeng CHEN, Meng FAN, Hongzhan CHENG, Huaina WU, Yang ZHANG, Binyong GAO. Analytical study on the mechanical behavior of longitudinal joints in shield tunnel strengthened by a steel ultra-high performance concrete composite. Front. Struct. Civ. Eng., 2025, 19(2): 207–223 https://doi.org/10.1007/s11709-025-1150-2

摘要

论文首次提出了钢-超高性能混凝土（UHPC）复合材料加固纵向接缝的力学计算模型，并对数值结果进行了验证。该方法可通过实时监测和调整每种材料的应力阶段，连续计算全过程力学响应，无需根据实验现象划分阶段。通过参数分析，探讨了强化参数和轴力水平的影响。比较了正弯矩和负弯矩下的加固机理；在正弯矩下，加固效果显著，承载能力提高了4.14倍，抗弯刚度提高了2.93倍；在负弯矩下，抗弯刚度的改善更为明显。对于正弯矩，影响结构承载能力和刚度的主要因素分别是钢板和超高性能混凝土厚度。在负弯矩下，轴向力水平是提高结构力学性能的最关键因素。正弯矩和负弯矩下的加固机制不同，前者有效利用了加固材料的机械性能，而后者则进一步挖掘了螺栓的抗弯性能。

钢UHPC复合材料加固的纵向节理：（a）细节;（b）几何尺寸;（c）横截面

Abstract

A mechanical calculation model for longitudinal joints strengthened by steel ultra-high performance concrete (UHPC) composites was first proposed and validated against the numerical results. This method can continuously calculate the mechanical response of the whole process by real-time monitoring and adjusting the stress stage of each material, eliminating the need to divide stages based on experimental phenomena. Parameter analysis was performed to explored the influence of strengthening parameter and axial force level. The strengthening mechanism under sagging and hogging moments was investigated and compared. Under sagging moments, the strengthening effect is significant, boosting the load-bearing capacity by 4.14 times and increasing the flexural stiffness by 2.93 times. Under hogging moments, a more pronounced improvement in flexural stiffness is observed. For sagging moments, the primary factors influencing structural bearing capacity and stiffness are the thickness of the steel plate and UHPC, respectively. Under hogging moments, the axial force level emerged as the most critical factor for enhancing structural mechanical performance. The strengthening mechanisms differ under sagging and hogging moments, with the former effectively leveraging the mechanical properties of the strengthening material, while the latter further explore the bending resistance of the bolts. These findings contribute to the theoretical foundation for practical engineering strengthening.

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