Experimental and numerical investigation of the flexural performance of channel steel-bolt joint for prefabricated subway stations

IF 2.9 3区工程技术 Q2 ENGINEERING, CIVIL Frontiers of Structural and Civil Engineering Pub Date : 2024-06-21 DOI:10.1007/s11709-024-1068-0

Lei Wang, Shengyang Zhou, Xiangsheng Chen, Xian Liu, Shuya Liu, Dong Su, Shouchao Jiang, Qikai Zhu, Haoyu Yao

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Abstract

Flexural performance of joints is critical for prefabricated structures. This study presents a novel channel steel-bolt (CB) joint for prefabricated subway stations. Full-scale tests are carried out to investigate the flexural behavior of the CB joint under the design loads of the test-case station. In addition, a three dimensional (3D) finite element (FE) model of the CB joint is established, incorporating viscous contact to simulate the bonding and detachment behaviors of the interface between channel steel and concrete. Based on the 3D FE model, the study examines the flexural bearing mechanism and influencing factors for the flexural performance of the CB joint. The results indicate that the flexural behavior of the CB joint exhibits significant nonlinear characteristics, which can be divided into four stages. To illustrate the piecewise linearity of the bending moment-rotational angle curve, a four-stage simplified model is proposed, which is easily applicable in engineering practice. The study reveals that axial force can enhance the flexural capacity of the CB joint, while the preload of the bolt has a negligible effect. The flexural capacity of the CB joint is approximate twice the value of the designed bending moment, demonstrating that the joint is suitable for the test-case station.

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预制地铁站槽钢-螺栓连接弯曲性能的实验和数值研究

对于预制结构而言，连接处的抗弯性能至关重要。本研究提出了一种用于预制地铁站的新型槽钢-螺栓（CB）接头。研究人员进行了全尺寸试验，以研究 CB 接头在试验车站设计荷载下的挠曲性能。此外，还建立了 CB 接头的三维（3D）有限元（FE）模型，结合粘性接触来模拟槽钢和混凝土界面的粘合和脱落行为。基于三维有限元模型，研究探讨了 CB 接头的抗弯承载机制和抗弯性能的影响因素。结果表明，CB 接头的抗弯行为具有明显的非线性特征，可分为四个阶段。为了说明弯矩-转角曲线的片断线性，提出了一个四阶段简化模型，该模型易于在工程实践中应用。研究表明，轴向力可以提高 CB 接头的抗弯能力，而螺栓预紧力的影响可以忽略不计。CB 接头的抗弯能力约为设计弯矩值的两倍，表明该接头适用于试验站。

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来源期刊

Frontiers of Structural and Civil Engineering Engineering-Architecture

CiteScore

5.20

自引率

3.30%

发文量

734

期刊介绍： Frontiers of Structural and Civil Engineering is an international journal that publishes original research papers, review articles and case studies related to civil and structural engineering. Topics include but are not limited to the latest developments in building and bridge structures, geotechnical engineering, hydraulic engineering, coastal engineering, and transport engineering. Case studies that demonstrate the successful applications of cutting-edge research technologies are welcome. The journal also promotes and publishes interdisciplinary research and applications connecting civil engineering and other disciplines, such as bio-, info-, nano- and social sciences and technology. Manuscripts submitted for publication will be subject to a stringent peer review.