Experimental study on group riveting effect and post-rivet preload relaxation of ring groove rivet

doi:10.3785/j.issn.1008-973X.2026.04.017

Journal of ZheJiang University (Engineering Science)

2026, Vol. 60

Issue (4): 855-864 DOI: 10.3785/j.issn.1008-973X.2026.04.017

Experimental study on group riveting effect and post-rivet preload relaxation of ring groove rivet

Zhenbei LIU1(

),Hailei WANG2,3,Weidong DONG2,3,Liang LI4,Kun WANG1,Yongjian LIU1,5,*(

),Zihao LIU1

1. School of Highway, Chang’an University, Xi’an 710064, China
2. Guangdong Provincial Highway Construction Co. Ltd, Guangzhou 510030, China
3. Guangdong Bay Area Transportation Construction Investment Co. Ltd, Guangzhou 511462, China
4. CCCC Highway Consultants Co. Ltd, Beijing 100010, China
5. School of Civil Engineering, Chongqing University, Chongqing 400045, China

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Abstract

The pre-tightening force is the key factor to resist external load in a connection, and its magnitude directly affects the stiffness and fatigue life of the connection. The Shiyang Bridge, a long-span steel truss suspension bridge, was taken as the support project. Aiming at the problem that the traditional bolt connections were prone to loosening under load, the group riveting effect of short-tailed ring groove rivets and the preload relaxation behavior after riveting were studied. Through a full-scale model test of chord ring groove rivets, the distribution of preload, the influence of riveting sequence on preload, and the law of preload relaxation after riveting were systematically investigated. The results showed that the pre-tightening force of the ring groove rivet was normally distributed in the range of 310~350 kN, which was significantly higher than the design value of high-strength bolts of the same type, and met the specification requirements. The riveting process can cause pre-tightening force attenuation. The sequence of cross-riveting from the center of the rivet cluster to the periphery resulted in a smaller degree of pre-tightening force attenuation. The rivets in the center area of the group riveting were most affected. During the 1600 hours monitoring period, the preload attenuated by an average of 2.57%, which still met the design requirements after relaxation. The preload loss caused by the riveting process was more significant than that caused by rivet relaxation.

Key words： steel truss beam ring groove rivet full-scale model test pre-tightening force riveting sequence

Received: 05 June 2025 Published: 19 March 2026

CLC:

U 443

Fund: 广东省交通集团重点研发项目（JT2023ZD01-01）.

Corresponding Authors: Yongjian LIU E-mail: damienliu@163.com;liuyongjian@chd.edu.cn

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	Zhenbei LIU
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	Zihao LIU

Cite this article:

Zhenbei LIU,Hailei WANG,Weidong DONG,Liang LI,Kun WANG,Yongjian LIU,Zihao LIU. Experimental study on group riveting effect and post-rivet preload relaxation of ring groove rivet. Journal of ZheJiang University (Engineering Science), 2026, 60(4): 855-864.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2026.04.017 OR https://www.zjujournals.com/eng/Y2026/V60/I4/855

环槽铆钉群铆效应及铆后预紧力松弛试验研究

预紧力作为连接中抵抗外部荷载的关键因素，其大小直接影响连接的刚度和疲劳寿命. 以狮子洋大桥?一座大跨径钢桁梁悬索桥为依托工程，针对传统螺栓连接在荷载作用下易松动问题，研究短尾环槽铆钉群铆效应及铆后预紧力松弛行为. 开展弦杆环槽铆钉足尺模型试验，探究环槽铆钉的预紧力分布、施铆顺序对预紧力的影响以及施铆后预紧力松弛规律. 研究结果表明：环槽铆钉的预紧力呈正态分布于310~350 kN范围内，显著高于同型号高强螺栓的设计值，且满足规范要求. 施铆过程会导致预紧力产生衰减，由群铆中心向四周交叉施铆的顺序具有更小的预紧力衰减程度，此时群铆中心区域的铆钉受影响最大. 在1600 h的监测期内，预紧力平均衰减2.57%，松弛后仍满足设计要求. 施拧过程造成的预紧力损失比铆钉松弛造成的预紧力损失更为显著.

关键词： 钢桁梁, 环槽铆钉, 足尺模型试验, 预紧力, 施拧顺序

Fig.1 Illustration of installation principle of ring groove rivets

Fig.2 Profile diagram of ring groove rivet and high strength bolt

Fig.3 Standard segmental elevation arrangement

Fig.4 Cross-sectional configuration of stiffening girder

Fig.5 Specimen construction of chord full scale model test

Fig.6 Specimen photo of full scale model test

Fig.7 Ring groove rivet layout

Fig.8 Construction sequence of specimen web

Fig.9 Construction sequence of top and bottom plates (Riveting sequence I)

Fig.10 Temporary assembly measures

Fig.11 Ring groove rivet pre-load measuring equipment

Fig.12 Test point arrangement of ring groove rivet

Fig.13 Curve of pre-load process of ring groove rivet

Tab.1 Monitoring results of preload of ring groove rivet

Fig.14 Preload distribution of ring groove rivet

Tab.2 Effect of riveting sequence on CA preload in test area (Riveting sequence Ⅱ)

Tab.3 Effect of riveting sequence on CA preload in test area (Riveting sequence Ⅰ)

Tab.4 Preload relaxation results

Fig.15 Relaxation results of average preload force of ring groove rivet in each test area


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