钢-混结合连续梁负弯矩区耐久性提升技术研究

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Abstract Research purposes: In order to further improve the structural durability, considering large dead load and live load of railway, taking 4×40 m railway steel-concrete composite continuous beam as an example, based on finite element analysis software Midas Civil, the feasibility and force behavior of uplift restricted-slip free studs of railway are studied.
Research conclusions: (1) After the use of uplift restricted-slip free studs in the negative moment regions, the deflection of structure, beam-end rotation angle and natural frequency are little variable compared with the conventional shear studs, which has only little impact on the overall performance of steel beam. (2) It is recommended to use uplift restricted-slip free studs at the range of 0.15L (L is the beam span) at both sides of the middle fulcrum. (3) The transition regions on both sides are actually constraint-strengthening regions, and it's necessary to pay special attention to the studs setting in this area, ensuring that the first row of studs of transition regions meet the requirements of strength and fatigue performance. (4) The arrangement of studs on the narrow flange of I section is limited, and it has poor adaptability to the transitional strengthening area which shall be set for the uplift restricted-slip free studs. (5) The research results can provide references for the durability improvement in the negative moment regions of steel-concrete continuous beam bridge of passenger and freight railway.

Key words： steel-concrete composite beam uplift restricted-slip free studs railway negative moment region transition region

Received: 26 September 2022

PACS:

U448.36

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	Articles by authors
	SUN Zonglei
	AI Zongliang
	ZHANG Yuhan

Cite this article:

SUN Zonglei,AI Zongliang,ZHANG Yuhan. Research on the Durability Improvement Technology in the Negative Moment Regions of Steel-concrete Composite Continuous Beam[J]. Journal of Railway Engineering Society, 2022, 39(12): 54-59.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I12/54

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