Vol. 18, No. 2, pp. 536-543 (2022)
EXPERIMENTAL STUDY ON FATIGUE PERFORMANCE OF STEEL-CONCRETE
JOINT SECTION OF HYBRID GIRDER CABLE-STAYED BRIDGE
Yang Zhou 1, *, Qian-Hui Pu 2, Zhou Shi 2, Hong-Ye Gou 2 and Shi-Li Yang 2
1 School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, P.R. China
2 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education,
School of Civil Engineering, Southwest Jiaotong University, Chengdu, 610031, P.R. China
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 5 August 2020; Revised: 11 August 2021; Accepted: 11 August 2021
DOI:10.18057/IJASC.2022.18.2.2
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ABSTRACT
In this paper, a localized full-scale model of a steel-concrete joint section of a hybrid girder cable-stayed bridge is designed and fabricated based on the stress equivalent principle and Miner’s rule for cumulative linear damage caused by fatigue. The fatigue performance of this joint section is studied through both fatigue verification and failure loading, and the stresses of various structural members of the section are tested during loading processes. The results show that the stress values at various test points of the steel structure and shear connectors remain basically unchanged during a fatigue verification test of 2 million load cycles. After a fatigue test of 3 million load cycles, the stress level of the bottom and web plates on the steel structure increases slightly, the shear studs with larger stresses near the loading end enter a plastic state, and the overall rigidity decreases. Moreover, although the stress level of perforated-bonding (PBL) shear connectors increases gradually, the linear stress state is maintained. The load-carrying ratio of the shear studs decreases, while that of the PBL shear connectors rises. The stresses at the test points of the concrete structure are essentially unchanged before and after the fatigue tests, and the fatigue load has little effect on the stress of the concrete structure. The design of the joint section is reasonable and may be referenced for similar future projects.
KEYWORDS
Hybrid girder cable-stayed bridge, Steel-concrete joint section, Fatigue model test, Fatigue performance
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