Research on Extremely Low-Cycle Fatigue Crack Initiation and Propagation of Thick-Walled Steel Box-Section Bridge Piers

Ting Zhu; Shengbin Gao

doi:10.13206/j.gjgs20061203

Volume 36 Issue 10

Jan. 2022

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Ting Zhu, Shengbin Gao. Research on Extremely Low-Cycle Fatigue Crack Initiation and Propagation of Thick-Walled Steel Box-Section Bridge Piers[J]. STEEL CONSTRUCTION(Chinese & English), 2021, 36(10): 16-24. doi: 10.13206/j.gjgs20061203

Citation:

Ting Zhu, Shengbin Gao. Research on Extremely Low-Cycle Fatigue Crack Initiation and Propagation of Thick-Walled Steel Box-Section Bridge Piers[J]. STEEL CONSTRUCTION(Chinese & English), 2021, 36(10): 16-24. doi: 10.13206/j.gjgs20061203

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Research on Extremely Low-Cycle Fatigue Crack Initiation and Propagation of Thick-Walled Steel Box-Section Bridge Piers

doi: 10.13206/j.gjgs20061203

Ting Zhu¹,
Shengbin Gao^{2
,
,}

1. Department of Civil Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
2. College of Civil Engineering, Shanghai Normal University, Shanghai 201418, China

Received Date: 2020-06-12
Available Online: 2022-01-11

Abstract

Abstract

In order to investigate the Extremely Low-Cycle Fatigue(ELCF) crack initiation life and crack propagation process of thick-walled steel box-section bridge piers, a series of thick-walled steel box-section piers subjected to a constant vertical load and cyclic lateral loading are numerically simulated by using ABAQUS software package. To improve the computing efficiency, 1/2 of the pier is modelled and the method to combine the shell element and beam element is employed to simulate the lower part and upper part of the piers, respectively. The crack initiation criterion based on Rice-Tracey model and the combined hardening model of steel is utilized to predict ELCF crack initiation life. A method based on ultimate fracture displacement is used to simulate ELCF crack propagation process. The accuracy of the crack initiation criterion and the crack propagation criterion to predict the ELCF crack initiation life and crack propagation process is verified by comparing the analytical results with test results. The factors affecting the ELCF crack initiation life and crack propagation process of the piers(i.e., normalized flange's width-thickness ratio, normalized slenderness ratio, and loading pattern) are parametrically studied, and the failure modes of the piers under different structural parameters are investigated. The difference between the crack initiation life and the ELCF failure life is defined as the ELCF residual life. The effect of structural parameters on the ELCF residual life of the piers is discussed. The agreement of the crack initiation life between the simulation result and test result indicates that the crack initiation criterion based on the Rice-Tracey model and the combined hardening model of steel can accurately predict the crack initiation life of the piers. The agreement of the crack growth length between the simulation result and test result demonstrates that the crack propagation criterion based on the ultimate fracture displacement can accurately predict the ELCF crack propagation process of the piers. On the basis of verifying the accuracy of the numerical analysis method, three types of failure modes(i.e., ELCF failure mode, local buckling failure mode and mixed failure mode) under different structural parameters are proposed by comparing the occurrence time of the ELCF failure and the local buckling failure, as well as the crack growth length based on the parametric study.
It is concluded that ELCF failure often occurs when the normalized flange's width-thickness ratio and the normalized slenderness ratio become relatively small, while the local buckling failure occurs when they are relatively large. The ELCF residual life of the piers is not only related to the normalized flange's width-thickness ratio and normalized slenderness ratio, but also related to the loading pattern. The research results can provide significant reference value for the seismic design of such steel bridge piers.
- steel piers,
- crack initiation criterion,
- crack propagation criterion,
- parametric study,
- failure mode,
- ELCF residual life

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References(18)

References

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