钢-混结合连续梁负弯矩区耐久性提升技术研究

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摘要 研究目的: 为进一步提升结构耐久性,针对铁路恒载、活载均较大的情况,以4×40 m铁路钢-混组合连续梁为例,基于有限元分析软件Midas Civil,研究采用新型抗拔不抗剪栓钉的可行性和受力行为。
研究结论: (1)在负弯矩区采用抗拔不抗剪栓钉后,结构的挠度、梁端转角、自振频率等刚度指标与常规栓钉方案相比变化很小,对钢梁整体受力性能影响很小;(2)推荐采用0.15L(L为梁跨度)作为中支点设置抗拔不抗剪栓钉的区域;(3)两侧的过渡区实为约束加强区,需要重点关注该区域栓钉设置,确保首排栓钉满足强度以及疲劳性能的要求;(4)工字形截面栓钉布置受限,与抗拔不抗剪需要设置过渡加强区的适应性较差;(5)本研究成果可为客货共线铁路钢-混组合连续梁桥负弯矩区耐久性提升提供借鉴和参考。

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	孙宗磊
	艾宗良
	张誉瀚

关键词 ：钢-混结合梁, 抗拔不抗剪栓钉, 铁路, 负弯矩区, 加密过渡区

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

收稿日期: 2022-09-26

PACS:

U448.36

基金资助:中国国家铁路集团有限公司科技研究计划重大课题(K2019G004)

作者简介: 孙宗磊,1974年出生,男,教授级高级工程师。

引用本文:

孙宗磊, 艾宗良, 张誉瀚. 钢-混结合连续梁负弯矩区耐久性提升技术研究[J]. 铁道工程学报, 2022, 39(12): 54-59.
SUN Zonglei, AI Zongliang, ZHANG Yuhan. Research on the Durability Improvement Technology in the Negative Moment Regions of Steel-concrete Composite Continuous Beam. Journal of Railway Engineering Society, 2022, 39(12): 54-59.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I12/54

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