悬挂式单轨单肋式拱桥设计参数敏感性分析
宋广林
Sensitivity Analysis of Design Parameters for Suspended Monorail Single-ribbed Arch Bridge
SONG Guanglin
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作者信息:中铁上海设计院集团有限公司， 200040， 上海
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Affiliation:China Railway Shanghai Design Institute Group Corporation Limited, 200040, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.03.004
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中图分类号/CLCN:U442.5：U232
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栏目/Col:研究报告
摘要:
［目的］鉴于目前针对悬挂式单轨单肋式拱桥的研究案例较少，为了更好地指导悬挂式单轨拱桥的设计和施工，需要对其不同设计参数的敏感性进行分析。［方法］以湖南某旅游空中列车项目为背景，通过Midas空间杆系整体模型和ANSYS板壳单元细部模型，对跨度为60 m，采用刚性吊杆钢箱拱，拱、梁、墩刚接的单肋式双线拱桥进行计算分析。研究了不同设计参数对轨道梁刚度、主梁应力、主梁翘曲畸变的敏感性影响；提出了设计参数敏感性评价指标，将其按敏感因子10%和5%划分为大、中、小3个等级，得到了主要设计参数的敏感性差异。［结果及结论］拱桥矢跨比、中横梁尺寸及桥墩尺寸依次对于主梁竖向挠度、主梁水平位移和梁端转角是敏感性参数，主梁的加劲肋间距对主梁应力和跨中畸变是敏感性参数，主梁腹板厚度对梁端翘曲是敏感性参数。对于悬挂式单轨单肋式拱桥，其刚度要求相对应力要求更加控制拱桥设计，设计中宜采用合理的设计参数。
Abstracts:
［Objective］ As there are few case studies on suspended monorail single-ribbed arch bridge, it is necessary to analyze the sensitivity of different design parameters to better instruct the design and construction of the bridge. ［Method］ With a tourism air train project in Hunan Province as the background, the Midas-Civil space rod system model and ANSYS plate-shell element model are used to calculate and analyze the single-ribbed double-line arch bridge, which is of 60m span and uses steel box arch with rigid boom, and rigidly connected arch, beam and pier. The influence of different design parameters on the sensitivity of track beam stiffness, main beam stress and main beam distortion is studied. The sensitivity evaluation index of design parameters is put forward, which is divided into three grades according to the sensitivity factors 10% and 5%, and the sensitivity difference of the main design parameters is obtained. ［Result & Conclusion］ The sagittal span ratio of arch bridge, the dimensions of middle beam and pier are sensitive parameters in sequence to the vertical deflection of main beam, the horizontal and transverse displacement of main beam and the turning angle of beam end. The spacing between stiffeners of the main beam is a sensitive parameter to the stress of the main beam and the distortion in the midspan, and the thickness of main beam web plate is a sensitive parameter to the warpage of beam end. For suspended monorail single-ribbed arch bridge, the stiffness index overweighs the stress index in the bridge design, and reasonable design parameters should be adopted in the design.
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