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(1 湖南省建筑設(shè)計(jì)院集團(tuán)股份有限公司, 長沙 410012; 2 湖南科技大學(xué)土木工程學(xué)院,湘潭 411201)

摘要: 抗風(fēng)纜是大跨人行懸索橋重要的抗風(fēng)措施,會改變橋梁的動力特征,對橋梁的人致振動舒適度也會產(chǎn)生重要影響。 以某大跨人行懸索橋?yàn)楣こ瘫尘?建立空間有限元模型,比較了不同傾角抗風(fēng)纜橋梁的人致振動加速度峰值和側(cè)向動力失穩(wěn)臨界人數(shù),分析了抗風(fēng)纜對大跨人行懸索橋人致振動舒適度的影響。 結(jié)果表明:大跨人行懸索橋的模態(tài)分布十分密集,抗風(fēng)纜可提高結(jié)構(gòu)豎彎和側(cè)彎模態(tài)頻率;增設(shè)抗風(fēng)纜后,人致豎彎共振模態(tài)數(shù)略減少且最大加速度峰值減小,人致側(cè)彎共振模態(tài)數(shù)不變且最大加速度峰值無明顯減小;增設(shè)抗風(fēng)纜可以略微提高側(cè)向動力失穩(wěn)敏感模態(tài)的失穩(wěn)臨界人數(shù),但是提高人數(shù)有限;增設(shè)抗風(fēng)纜對大跨懸索人行橋人致振動舒適度的改善效果有限。

關(guān)鍵詞: 人行懸索橋; 人致振動; 抗風(fēng)纜; 舒適度評價(jià); 不同傾角

中圖分類號:U441+. 2 文獻(xiàn)標(biāo)志碼:A 文章編號: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

∗國家自然科學(xué)基金(51508184)。

第一作者:蔣望,博士,高級工程師,注冊土木工程師(道路工程),主要從事大跨度橋梁設(shè)計(jì)相關(guān)工作,Email:78824435@qq. com。

[引用本文] 蔣望,周越,張勇,等. 抗風(fēng)纜對大跨人行懸索橋人致振動舒適度的影響分析[J]. 建筑結(jié)構(gòu),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