(1 湖南省建筑设计院集团股份有限公司, 长沙 410012; 2 湖南科技大学土木工程学院,湘潭 411201)

摘要: 抗风缆是大跨人行悬索桥重要的抗风措施,会改变桥梁的动力特征,对桥梁的人致振动舒适度也会产生重要影响。 以某大跨人行悬索桥为工程背景,建立空间有限元模型,比较了不同倾角抗风缆桥梁的人致振动加速度峰值和侧向动力失稳临界人数,分析了抗风缆对大跨人行悬索桥人致振动舒适度的影响。 结果表明:大跨人行悬索桥的模态分布十分密集,抗风缆可提高结构竖弯和侧弯模态频率;增设抗风缆后,人致竖弯共振模态数略减少且最大加速度峰值减小,人致侧弯共振模态数不变且最大加速度峰值无明显减小;增设抗风缆可以略微提高侧向动力失稳敏感模态的失稳临界人数,但是提高人数有限;增设抗风缆对大跨悬索人行桥人致振动舒适度的改善效果有限。

关键词: 人行悬索桥; 人致振动; 抗风缆; 舒适度评价; 不同倾角

中图分类号:U441+. 2 文献标志码:A 文章编号:1002-848X(2022)22-0114-06

DOI:10. 19701 / j. jzjg. ZJ220010

Analysis of the effect of wind-resistant cables on the human-induced vibration comfort of large-span pedestrian suspension bridges

JIANG Wang1,2, ZHOU Yue2, ZHANG Yong2, WEN Qing2, LI Shouke2

(1 Hunan Architectural Design Institute Group Co. , Ltd. , Changsha 410012, China; 2 School of Civil Engineering,Hunan University of Science and Technology, Xiangtan 411201, China)

Abstract: Wind-resistant cable is an important measure for wind design of large-span pedestrian suspension bridge, and itchanges the dynamic characteristics of the bridge and has an important impact on the human-induced vibration comfort ofthe bridge. Based on the engineering background of a large-span pedestrian suspension bridge, a spatial finite elementmodel was established to compare the peak acceleration of human-induced vibration and the critical number of lateraldynamic instability of bridges with different wind-resistant cables obliguity, and to analyze the influence of wind-resistantcables on human-induced vibration comfort of large-span pedestrian suspension bridge. The results show that: the modaldistribution of the large-span suspension bridge is very dense, and the wind-resistant cables can improve the modalfrequency of vertical and lateral bending; after the arrangement of the wind-resistance cable, the modal number of humaninduced vertical bending resonance decreases slightly and the maximum peak acceleration decreases, while the modalnumber of human-induced lateral bending resonance does not change and the maximum peak acceleration does not decreasesignificantly; adding wind-resistant cables can slightly improve the critical number of lateral dynamic instability of eachmode, but the improvement is limited. The arrangement of wind-resistant cable has limited effect on the improvement ofhuman-induced vibration comfort of the bridge.

Keywords: pedestrian suspension bridge; human-induced vibration; wind-resistant cable; comfort evaluation;different obliquity

∗国家自然科学基金(51508184)。

第一作者:蒋望,博士,高级工程师,注册土木工程师(道路工程),主要从事大跨度桥梁设计相关工作,Email:78824435@qq. com。

[引用本文] 蒋望,周越,张勇,等. 抗风缆对大跨人行悬索桥人致振动舒适度的影响分析[J]. 建筑结构,2022,52(22):114-119. JIANG Wang,ZHOU Yue,ZHANG Yong,et al. Analysis of the effect of wind-resistant cables on the human-inducedvibration comfort of large-span pedestrian suspension bridges [J]. Building Structure,2022,52(22):114-119