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Structural Engineering and Mechanics Volume 62, Number 2, April25 2017 , pages 225-236 DOI: https://doi.org/10.12989/sem.2017.62.2.225 |
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A cumulative damage model for extremely low cycle fatigue cracking in steel structure |
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Xuewei Huang and Jun Zhao
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Abstract | ||
The purpose of this work is to predict ductile fracture of structural steel under extremely low cyclic loading experienced in earthquake. A cumulative damage model is proposed on the basis of an existing damage model originally aiming to predict fracture under monotonic loading. The cumulative damage model assumes that damage does not grow when stress triaxiality is below a threshold and fracture occurs when accumulated damage reach unit. The model was implemented in ABAQUS software. The cumulative damage model parameters for steel base metal, weld metal and heat affected zone were calibrated, respectively, through testing and finite element analyses of notched coupon specimens. The damage evolution law in the notched coupon specimens under different loads was compared. Finally, in order to examine the engineering applicability of the proposed model, the fracture performance of beam-column welded joints reported by previous researches was analyzed based on the cumulative damage model. The analysis results show that the cumulative damage model is able to successfully predict the cracking location, fracture process, the crack initiation life, and the total fatigue life of the joints. | ||
Key Words | ||
cumulative damage model; structural steel; extremely low cycle fatigue; ductile fracture; beam-column welded joint | ||
Address | ||
Xuewei Huang and Jun Zhao: School of Mechanics and Engineering Science, Zhengzhou University, No.100, Science Avenue, Zhengzhou 450001, China | ||