疲劳荷载后螺栓连接的钢-混凝土组合界面摩擦性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1423

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (6): 2111-2120.DOI: 10.16552/j.cnki.issn1001-1625.2024.1423

疲劳荷载后螺栓连接的钢-混凝土组合界面摩擦性能研究

赵钰臣¹, 邢颖¹, 李伟², 郭琪¹

1.太原理工大学土木工程学院,太原 030024;
2.中铁十八局集团建筑安装工程有限公司,天津 300308

收稿日期:2024-11-20 修订日期:2024-12-22 发布日期:2025-06-27
通信作者: 邢颖,博士,副教授。E-mail:xingying_jamie@163.com
作者简介:赵钰臣(2000—),男,硕士研究生。主要从事组合结构方面的研究。E-mail:1012779605@qq.com
基金资助:
国家自然科学基金(52478194,52208192);山西省应用基础研究计划(202203021221062,202103021224047)

Friction Performance of Steel-Concrete Composite Interface ThroughBolted Joints under Fatigue Loading

ZHAO Yuchen¹, XING Ying¹, LI Wei², GUO Qi¹

1. College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. China Railway 18th Bureau Group Construction and Installation Engineering Co. Ltd., Tianjin 300308, China

Received:2024-11-20 Revised:2024-12-22 Online:2025-06-27

摘要/Abstract

摘要： 螺栓作为组合梁中新型剪力连接件,可提高结构装配化程度并避免焊接缺陷,本文对13组试件进行静力及疲劳试验,研究螺栓连接的钢-混凝土组合界面在疲劳荷载下的摩擦性能演化规律,得到了钢-混凝土组合界面的静摩擦承载力及循环荷载下的相对滑移、抗剪刚度、螺栓预紧力、磨损后摩擦系数。结果表明:摩擦抗剪连接在200万次循环后未发生疲劳破坏;螺栓预紧力在循环过程中持续衰减并与峰值荷载呈正相关,损失约为8.38%;磨损后界面的摩擦系数于10万次循环后降至最低值0.486,之后持续增大并超过初始静摩擦系数;由于咬合抗剪变化及磨粒迁移作用,磨痕深度先增大再降低,从微观尺度上揭示了混凝土界面摩擦性能疲劳的演化机理。研究结果为摩擦型螺栓剪力连接件的设计提供一定参考。

关键词: 钢-混凝土组合界面, 螺栓连接, 疲劳荷载, 界面摩擦, 磨损机制, 微观形貌

Abstract: As a new type of shear connector in composite beams, bolts can improve the degree of structural assembly and avoid welding defects. In this paper, static and fatigue tests were carried out on 13 groups specimens. The evolution of friction performance of steel-concrete composite interface through bolted joints under fatigue loading was explored. The static friction bearing capacity of steel-concrete composite interface and the relative slip, shear stiffness, bolt preload and friction coefficient after wear under cyclic load were obtained. The results show that there is no fatigue failure of the friction shear connection after 2 million cycles. The pre-tightening force of the bolt continues to decay during the cycle and is positively correlated with the peak load, with a loss of about 8.38%. The friction coefficient of interface after wear decreases to the lowest value of 0.486 after 100 000 cycles, but it continues to increase and even exceeds the initial static friction coefficient. Due to the change of occlusion shear and the migration of abrasive particles, the depth of wear marks increases first and then decreases, which explains the evolution mechanism of fatigue of friction performance of concrete interface at the micro scale. The research results provide some reference for the design of friction bolt shear connectors.

Key words: steel-concrete composite interface, bolted joint, fatigue loading, interfacial friction, wear mechanism, microscopic morphology

中图分类号:

TQ178

赵钰臣, 邢颖, 李伟, 郭琪. 疲劳荷载后螺栓连接的钢-混凝土组合界面摩擦性能研究[J]. 硅酸盐通报, 2025, 44(6): 2111-2120.

ZHAO Yuchen, XING Ying, LI Wei, GUO Qi. Friction Performance of Steel-Concrete Composite Interface ThroughBolted Joints under Fatigue Loading[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2111-2120.

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疲劳荷载后螺栓连接的钢-混凝土组合界面摩擦性能研究

Friction Performance of Steel-Concrete Composite Interface ThroughBolted Joints under Fatigue Loading

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