钢底板波形腹板组合箱梁疲劳特性研究

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Abstract Research purposes: The fatigue details of the structure are very important for its fatigue damage. In order to analyze the fatigue details and fatigue life calculation method of steel bottom plate corrugated web-concrete composite box girder, and to provide a reference for the fatigue design of the structure of the type, the scale test beam model was made, and the fatigue test was carried out, to obtain the fatigue damage characteristics of this new type of structure. Combined with model test, numerical simulation and fracture mechanics analysis were used to study the fatigue life calculation and fatigue detail classification of new composite box girder, and the results were analyzed and verified by linear damage theory.
Research conclusions: (1) The fatigue cracks in the steel bottom plate corrugated web-concrete combined box girder under fatigue loading first appear at the weld fold between the bottom plate and the web on both sides, indicating that this is an important fatigue detail in the new combined box girder. (2) According to linear damage theory, the fatigue detail classification of the new structure is generally between categories B and C of the AASHTO Code fatigue category, which is higher than the lower boundary value of the B′ curve and lower than the median value of the B′ curve. (3) The error of total damage accumulation value calculated from the S-N curves obtained using numerical simulations and the modified fracture mechanics method is 3% and 6% respectively, indicating that both curves are applicable to the fatigue life calculation of new steel-concrete composite structures. (4) The research results can be used as a reference for the classification of fatigue details and fatigue design of combined box girders with steel bottom plates and corrugated webs.

Key words： steel bottom plate corrugated web-concrete composite box girder model test fatigue details fatigue characteristics S-N curve

Received: 28 April 2022

PACS:

U448.21

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	Articles by authors
	WANG Genhui
	NING Xin
	LIU Jianxun
	ZHANG Zichen
	WANG Shijin
	CHEN Pengfei

Cite this article:

WANG Genhui,NING Xin,LIU Jianxun, et al. Fatigue Characteristics of Composite Box Girder with Corrugated Web and Steel Bottom Plate[J]. Journal of Railway Engineering Society, 2023, 40(7): 40-45.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I7/40

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