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吳海亮¹，申彥利^1,2

(1.河北工程大學 土木工程學院，河北 邯鄲 056000；

2.河北省裝配式結構技術創新中心，河北 邯鄲 056000)

摘 要：為解決W型人行天橋在極端人群荷載作用下的人橋共振問題，以西南地區某實際工程為例，基于數值模擬的方法進行極端人群荷載下的動力舒適度分析，并對其減振方案進行研究。研究結果表明：當人行天橋豎向一階自振頻率為3.04 Hz時，W型人行天橋存在人橋共振隱患；通過計算，0.2、0.5、1.0、1.5、4.6 P/m2五種人群荷載工況下主梁峰值加速度為0.96 m/s2，舒適度指標為中等，未達到最優的舒適性等級。在振幅最大位置處設置質量比為1%的調諧質量阻尼器（TMD）后，主梁峰值加速度降為0.10 m/s2，減振率為89.6%，人行天橋滿足最優的舒適度等級。研究成果可為同類異形人行天橋人致振動舒適度評價與減振設計提供技術參考。

關鍵詞:異形人行天橋；人致振動；舒適度研究；減振設計

中圖分類號:U448          

文獻標志碼:A      

文章編號：1005-8249（2024）02-0117-08

DOI：10.19860/j.cnki.issn1005-8249.2024.02.022

 

WU Hailiang¹, SHEN Yanli^1,2

(1.School of Civil Engineering, Hebei University of Engineering, Handan 056000, China；

2. Hebei Province Prefabricated Structure Technology Innovation Center, Handan, 056000, China)

Abstract: In order to solve the man-bridge resonance problem of a W-type pedestrian bridge under extreme crowd load, taking a practical project in southwest China as an example, the dynamic comfort analysis under extreme crowd load was carried out based on numerical simulation method, and the vibration reduction scheme was studied. The results show that when the vertical first-order natural vibration frequency of the pedestrian bridge is 3.04 Hz, the W-shaped pedestrian bridge has hidden trouble of human-bridge resonance. According to the calculation, the peak acceleration of the main beam is 0.96 m/s2 under the five crowd loading conditions of 0.2, 0.5, 1.0, 1.5 and 4.6 P/m2, and the comfort index is medium, which does not reach the optimal comfort level. After a tuned mass damper (TMD) with a mass ratio of 1% was set at the position with the maximum amplitude, the peak acceleration of the main beam was reduced to 0.10 m/s2, and the vibration reduction rate was 89.6%. The pedestrian bridge satisfied the optimal comfort level. The research results can provide technical reference for evaluation of human induced vibration comfort and vibration reduction design of similar special-shaped pedestrian bridges.

Keywords: alien pedestrian bridge; human-induced vibration; comfort research; vibration damping design

 

 

 

*基金項目：國家自然科學基金（51378169）；河北省高等學校科學技術研究重點項目（ZD2016147）。

作者簡介：吳海亮（1996-），男，碩士研究生，主要研究方向：結構工程方面的學習和研究。

通信作者：申彥利（1977-），男，博士后，教授，主要研究方向：結構抗震工程學方面的研究。

收稿日期：2023-04-25