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栏杆对景区人行悬索桥主梁涡振性能影响研究

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为研究桥面栏杆对主梁涡振性能的影响,以国内某座宽跨比为 0.028 4 的景区人行悬索桥为工程背景,采用CFD数值模拟方法分别对有栏杆、无栏杆主梁的涡振响应特性进行分析计算,并针对桥面栏杆的栏杆形式、不同透风率对主梁涡振特性的影响规律进行分析总结.在此基础上,从涡脱演化形式、风压系数分布揭示其对主梁涡振性能的影响机理.研究结果表明,设置栏杆后,主梁的最大涡振幅值达到无栏杆主梁的2.2 倍;增大栏杆弧度会引起主梁涡振幅值增大,但增大栏杆透风率可以有效降低主梁涡振幅值;相较于无栏杆,有栏杆主梁上表面形成的漩涡尺度更大、数量更多,平均风压系数和脉动风压系数曲线均出现较大波动,这种较大波动在一定程度上说明了设置栏杆后主梁涡振幅值增大的原因.
Research on the Effect of Railings on the Vortex-induced Vibration Performance of Main Beam of Pedestrian Suspension Bridge in Scenic Spot
In order to study the influence of bridge deck railing on the vortex-induced vibration per-formance of main beams,a domestic scenic pedestrian suspension bridge with wide-span ratio of 0.028 4 was taken as the engineering background,and the vortex-induced vibration response characteristics of main beams with and without railings were analyzed and calculated by CFD numerical simulation me-thod.The effects of the railing form and different air permeability on the vortex-induced vibration charac-teristics of the main beam are analyzed and summarized.On this basis,the influence mechanism of vor-tex stripping on the vortex-induced vibration performance of the main beam is revealed from the evolu-tion form of vortex stripping and the distribution of wind pressure coefficient.The results show that the maximum vortex-induced vibration amplitude of the main beam with railings is 2.2 times that of the main beam without railings.Increasing the railing radia will increase the vortex-induced vibration ampli-tude of the main beam,but increasing the air permeability of the railing can effectively reduce the vor-tex-induced vibration amplitude of the main beam.Compared with those without railings,the vortices formed on the upper surface of the main beam with railings are larger in scale and more in number,and the curves of the average wind pressure coefficient and the fluctuating wind pressure coefficient both fluctuate greatly,which explains the reason for the increase of the vortex-induced vibration amplitude of the main beam after the railings are set up to a certain extent.

scenic spot pedestrian suspension bridgebridge deck railingsvortex-induced vibration characteristicvorticity evolutionrailing ventilation raterailing form

李玉学、胡志勇、董阳、赵莉

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石家庄铁道大学 土木工程学院,河北 石家庄 050043

河北省风工程与风能利用工程技术创新中心,河北 石家庄 050043

石家庄铁道大学 道路与铁道工程安全保障省部共建教育部重点实验室,河北 石家庄 050043

河北劳动关系职业学院,河北 石家庄 050093

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景区人行悬索桥 桥面栏杆 涡振特性 涡脱演化 栏杆透风率 栏杆形式

国家自然科学基金资助项目河北省自然科学基金资助项目中央引导地方科技发展资金项目北京交通大学"结构风工程与城市风环境北京市重点实验室"开放课题

51278314E2019210031206Z5401G2023-1

2024

10.3969/j.issn.1673-9469.2024.04.008

河北工程大学学报(自然科学版)
河北工程大学

河北工程大学学报(自然科学版)

CSTPCD
影响因子：0.543
ISSN：1673-9469
年,卷(期)：2024.41(4)