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Evaluation of fatigue life of stud in steelUHPC compositestructure based on fracture mechanics(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年2期
Page:
102-114
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Evaluation of fatigue life of stud in steelUHPC compositestructure based on fracture mechanics
Author(s):
SHI Guangyu;  LI Guangyao
(Department of Mechanics, Tianjin University, Tianjin 300350, China)
Keywords:
bridge engineering;  fatigue life of stud;  3D fracture mechanics analysis;  surface crack of stud weld joint;  steelUHPC composite bridge deck;  mixed mode crack propagation simulation;  SchwartzNeuman alternating method
PACS:
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DOI:
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Abstract:
In order to study the efficient fracture mechanics method for the fatigue evaluation of the stud connector in steelUHPC composite bridge deck, the 3D fracture mechanics model based on SchwartzNeuman alternating method was used to analyze the crack propagation of the surface crack of stud weld joint and predict the fatigue life of stud weld joint. Firstly, the accuracy and efficiency of SchwartzNeuman alternating method were verified by using fracture mechanics models of two commonly used finite element software ANSYS and ABAQUS. Then, the stress intensity factors (SIFs) of the initial cracks with various sizes and angles of stud welded joints were computed by the SchwartzNeuman alternating method, and the related parameters of initial crack were analyzed. Finally, based on the 3D propagation of the crack of stud welded joint, the fatigue life of stud welded joint was predicted and compared with the result of pushout test of steelUHPC composite structure. SchwartzNeuman alternating method had superior computational efficiency by comparing with the fracture mechanics models in ANSYS and ABAQUS by computing the SIFs of the deepburied inclined circular crack in cylinder. The results show that the crack of stud weld joint in steelUHPC composite structure under the interlaminar shear force of steelUHPC composite structure is mixed mode (typeⅠ+typeⅡ+typeⅢ) crack, and propagates nonplanarily during the process of crack propagation. The fatigue failure location of stud depends on the orientation of initial crack relative to crack driving force and the ratio of crack size at two weld toes of stud weld. The predicted value of the stud fatigue life computed by the 3D crack propagation of stud welded joint is in good agreement with the measured value of the stud fatigue life obtained from pushout test, which proves that the 3D propagation of surface crack based on SchwartzNeuman alternating method can be used to evaluate the fatigue life of stud in steelUHPC composite bridge deck efficiently and reliably. 5 tabs, 14 figs, 31 refs.

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Last Update: 2021-04-02