Fatigue tests and fatigue-life prediction models for hybrid welded-bolted demountable shear connectors

Jun He; Zitong Wang; George Vasdravellis; Lei Wang; Haohui Xin; José Correia; Filippo Berto

doi:10.1016/j.ijfatigue.2023.107826

Fatigue tests and fatigue-life prediction models for hybrid welded-bolted demountable shear connectors

Jun He, Zitong Wang, George Vasdravellis, Lei Wang, Haohui Xin, José Correia, Filippo Berto

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Four push out tests were conducted to assess the structural performance of a welded demountable shear connector (WDSC) under high-cycle fatigue loading. The primary failure mode observed was stud fracture at the base. The presence of grout inside the tube significantly increased the WDSC's fatigue life by 5.4 times. The study also analysed stiffness degradation and relative slip evolution during fatigue cycles. Two finite element-based approaches were employed for fatigue life prediction: the critical plane method for fatigue crack initiation life and fracture mechanics for crack propagation life. Based on the experimental and numerical results, fatigue life prediction formulas (Wöhler curves) are proposed for WDSCs with and without grout to aid in predicting fatigue failure in fatigue-sensitive structural designs.

Original language	English
Article number	107826
Journal	International Journal of Fatigue
Volume	175
Early online date	8 Jul 2023
DOIs	https://doi.org/10.1016/j.ijfatigue.2023.107826
Publication status	Published - Oct 2023

Keywords

Demountable shear connector
Fatigue life
Push out test
Shear strength
Stiffness degradation

ASJC Scopus subject areas

Modelling and Simulation
General Materials Science
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.ijfatigue.2023.107826

Cite this

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title = "Fatigue tests and fatigue-life prediction models for hybrid welded-bolted demountable shear connectors",

abstract = "Four push out tests were conducted to assess the structural performance of a welded demountable shear connector (WDSC) under high-cycle fatigue loading. The primary failure mode observed was stud fracture at the base. The presence of grout inside the tube significantly increased the WDSC's fatigue life by 5.4 times. The study also analysed stiffness degradation and relative slip evolution during fatigue cycles. Two finite element-based approaches were employed for fatigue life prediction: the critical plane method for fatigue crack initiation life and fracture mechanics for crack propagation life. Based on the experimental and numerical results, fatigue life prediction formulas (W{\"o}hler curves) are proposed for WDSCs with and without grout to aid in predicting fatigue failure in fatigue-sensitive structural designs.",

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AU - He, Jun

AU - Wang, Zitong

AU - Vasdravellis, George

AU - Wang, Lei

AU - Xin, Haohui

AU - Correia, José

AU - Berto, Filippo

PY - 2023/10

Y1 - 2023/10

N2 - Four push out tests were conducted to assess the structural performance of a welded demountable shear connector (WDSC) under high-cycle fatigue loading. The primary failure mode observed was stud fracture at the base. The presence of grout inside the tube significantly increased the WDSC's fatigue life by 5.4 times. The study also analysed stiffness degradation and relative slip evolution during fatigue cycles. Two finite element-based approaches were employed for fatigue life prediction: the critical plane method for fatigue crack initiation life and fracture mechanics for crack propagation life. Based on the experimental and numerical results, fatigue life prediction formulas (Wöhler curves) are proposed for WDSCs with and without grout to aid in predicting fatigue failure in fatigue-sensitive structural designs.

AB - Four push out tests were conducted to assess the structural performance of a welded demountable shear connector (WDSC) under high-cycle fatigue loading. The primary failure mode observed was stud fracture at the base. The presence of grout inside the tube significantly increased the WDSC's fatigue life by 5.4 times. The study also analysed stiffness degradation and relative slip evolution during fatigue cycles. Two finite element-based approaches were employed for fatigue life prediction: the critical plane method for fatigue crack initiation life and fracture mechanics for crack propagation life. Based on the experimental and numerical results, fatigue life prediction formulas (Wöhler curves) are proposed for WDSCs with and without grout to aid in predicting fatigue failure in fatigue-sensitive structural designs.

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KW - Fatigue life

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KW - Shear strength

KW - Stiffness degradation

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Fatigue tests and fatigue-life prediction models for hybrid welded-bolted demountable shear connectors

Abstract

Keywords

ASJC Scopus subject areas

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