装配式车站结构榫槽式预应力螺栓接头抗弯性能
臧延伟1刘长宝1章天杨1严佳佳1王博川2狄宏规2
Flexural Performance of Mortise-tenon Prestressed Bolt Joints in Prefabricated Station Structure
ZANG Yanwei1LIU Changbao1ZHANG Tianyang1YAN Jiajia1WANG Bochuan2DI Honggui2
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作者信息:1.中国电建集团华东勘测设计研究院有限公司，311122，杭州
2.同济大学道路与交通工程教育部重点实验室，201804，上海
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Affiliation:1.Power China Huadong Engineering Co., Ltd., 311122, Hangzhou, China
2.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.027
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中图分类号/CLCN:U231.4
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栏目/Col:研究报告
摘要:
［目的］合理的接头结构对车站安全至关重要，因此有必要研究附加预应力措施对装配式车站结构接头抗弯性能的提升效果。［方法］建立了采用预应力螺栓连接的榫槽式预应力接头精细化有限元模型，通过四点弯曲的加载方式，分析了不同螺栓设计参数对接头抗弯承载性能的影响。［结果及结论］在弯矩加载过程中，采用预应力螺栓连接的接头构件表现出较好的整体性，凹侧构件受拉侧手孔位置的应力集中引起了附近混凝土的受拉破坏；预应力螺栓接头构件的竖向位移及接缝张开量均随着螺栓直径、螺栓长度的增加而逐渐减小，其减小幅度随着螺栓直径、螺栓长度的增大而逐渐递减；设置螺栓预紧力能够显著提升接头的抗弯能力，其对接缝张开量的变形控制效果十分明显；提出了预应力螺栓直径、长度、预紧力等设计参数的优选建议。
Abstracts:
［Objective］ The rationality of joint structures is crucial for station safety. Therefore, it is necessary to study the enhancement effect of additional prestressing measures on the flexural performance of prefabricated station structure bolt joints. ［Method］ A refined finite element model of mortise-tenon prestressed joints using prestressed bolts is established. Through four-point bending loading, the influence of different bolt design parameters on the flexural bearing capacity of joints is analyzed. ［Result & Conclusion］ During the bending moment loading process, joints connected by prestressed bolts exhibit good overall integrity. Stress concentration on the handhole position on the concave-side component tension side leads to tensile failure of nearby concrete. The vertical displacement and joint-seam opening of prestressed bolt joints gradually decrease with increasing bolt diameter and length, and the reduction amplitude decreases as the bolt diameter and length increase. Setting bolt preload force can significantly improve the flexural capacity of the joints, with a noticeable effect on controlling the deformation of joint-seam opening. Recommendations to optimize design parameters for prestressed bolt diameter, length and preload force are proposed.
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