高强冷滚螺纹粗钢筋受力性能与参数影响研究

朱继新; 林路宇; 刘金斗; 崔闯

doi:10.3724/j.gyjzG25101603

高强冷滚螺纹粗钢筋受力性能与参数影响研究

doi: 10.3724/j.gyjzG25101603

朱继新¹,
林路宇¹,
刘金斗²,
崔闯^1,2, ,

1. 厦门路桥工程投资发展有限公司, 福建厦门 361006;
2. 西南交通大学土木工程学院, 成都 610031

基金项目:

国家自然科学基金项目（52278318，52378316）。

详细信息

作者简介:
朱继新，学士，高级工程师，主要从事结构工程研究，jxz1627@163.com。

通讯作者:
崔闯,博士,副教授,主要从事高性能钢与组合结构桥梁研究,ccui@swjtu.edu.cn。

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出版历程
- 收稿日期: 2025-10-16
- 网络出版日期: 2026-01-06

Research on the Mechanical Properties and Parameter Influence of Large-Diameter High-Strength Cold-Rolled Rebars

ZHU Jixin¹,
LIN Luyu¹,
LIU Jindou²,
CUI Chuang^{1,2
, ,}

1. Xiamen Road and Bridge Engineering Investment Development Co., Ltd., Xiamen 361006, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 装配式桥墩广泛应用于跨海、城市市政和山区等桥梁建设中，大直径螺纹粗钢筋作为装配式模块的重要连接和受力构件已被大量应用于实际工程。由其制造特性所决定，螺纹根部存在应力集中和初始缺陷，其受力性能研究较为匮乏。以高强冷滚螺纹粗钢筋为研究对象，考虑钢筋的螺纹根部应力集中效应对钢筋服役性能的影响，基于有限元方法探讨了不同螺纹几何参数对应力集中和疲劳性能的影响，揭示了钢筋螺纹参数对其性能的影响规律，确定了对其性能影响的关键参数。在此基础上，考虑应力集中效应和初始缺陷作用，探究了两者耦合对疲劳性能的影响规律。结果表明：螺牙根部应力集中系数K_t随着螺牙底宽l和螺纹倾角α的增加而增加；倒角半径r从0.5 mm增加至2.5 mm时，K_t降低约35%；初始裂纹倾角β不影响裂纹扩展的方向，但对疲劳寿命影响较大，β从90°降低至45°，疲劳寿命可降低28%。
- 高强冷滚螺纹粗钢筋 /
- 受力分析 /
- 参数影响 /
- 应力集中 /
- 疲劳性能
Abstract: Prefabricated bridge piers have been widely used in bridge construction across seas， urban municipal areas， and mountainous regions. Large-diameter threaded rebars， serving as crucial connecting and load-bearing components in prefabricated modules， have been extensively implemented in practical engineering projects. Due to their manufacturing characteristics， these threaded rebars inherently exhibit stress concentration and initial defects at thread roots， with relatively limited research available on their mechanical properties. This study focuses on large-diameter high-strength cold-rolled threaded rebars， investigating the impact of stress concentration effects at thread roots on their service performance. Using finite element methods， the research examined how different thread geometric parameters influence stress concentration and fatigue performance， revealing the relations between thread parameters and mechanical properties， while identifying key influential parameters. Furthermore， the coupled effects of stress concentration and initial defects on fatigue performance were explored. The results demonstrated that the stress concentration factor K_t at thread roots increased with thread base width l and thread angle α. When the fillet radius r was increased from 0.5 mm to 2.5 mm， K_t decreased by approximately 35%. The initial crack inclination angle β did not affect crack propagation direction but significantly influence fatigue life： reducing β from 90° to 45° decreased fatigue life by 28%.
- large-diameter high-strength cold-rolled threaded rebars /
- force analysis /
- parametric influence /
- stress concentration /
- fatigue performance

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