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吴海亮¹，申彦利^1,2

(1.河北工程大学 土木工程学院，河北 邯郸 056000；

2.河北省装配式结构技术创新中心，河北 邯郸 056000)

摘 要：为解决W型人行天桥在极端人群荷载作用下的人桥共振问题，以西南地区某实际工程为例，基于数值模拟的方法进行极端人群荷载下的动力舒适度分析，并对其减振方案进行研究。研究结果表明：当人行天桥竖向一阶自振频率为3.04 Hz时，W型人行天桥存在人桥共振隐患；通过计算，0.2、0.5、1.0、1.5、4.6 P/m2五种人群荷载工况下主梁峰值加速度为0.96 m/s2，舒适度指标为中等，未达到最优的舒适性等级。在振幅最大位置处设置质量比为1%的调谐质量阻尼器（TMD）后，主梁峰值加速度降为0.10 m/s2，减振率为89.6%，人行天桥满足最优的舒适度等级。研究成果可为同类异形人行天桥人致振动舒适度评价与减振设计提供技术参考。

关键词:异形人行天桥；人致振动；舒适度研究；减振设计

中图分类号:U448          

文献标志码:A      

文章编号：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

 

 

 

*基金项目：国家自然科学基金（51378169）；河北省高等学校科学技术研究重点项目（ZD2016147）。

作者简介：吴海亮（1996-），男，硕士研究生，主要研究方向：结构工程方面的学习和研究。

通信作者：申彦利（1977-），男，博士后，教授，主要研究方向：结构抗震工程学方面的研究。

收稿日期：2023-04-25