钢结构景观人行桥振动舒适度优化设计

Optimization Design of Vibration Comfort Level of Steel Structural Landscape Pedestrian Bridge

随着城市景观人行桥的发展,其结构越来越多的呈现出轻柔、低阻尼等特征,而这些特点会引发人致振动现象,桥梁的基频也基本无法达到国内外现行标准的要求。以苏州某曲线形景观人行桥为例,对桥梁方案设计方案加以阐述,并根据《德国人行桥设计指南》(EN03—2007),得到人行激励荷载,对设置TMD阻尼减震器前后对结构的动力特性和峰值加速度响应进行分析对比,分析对桥梁结构舒适度的影响,供今后类似项目参考。

With the development of urban landscape pedestrian bridge,its structure is more and more presenting the characteristics of light and soft,low damping,etc.,and these characteristics will trigger the phenomenon of human-caused vibration.The fundamental frequency of the bridge basically fails to meet the requirements of the current standards at home and abroad.Taking a curved landscape pedestrian bridge in Suzhou as an example,the design scheme of the bridge is elaborated.According to German Pedestrian Bridge Design Guidelines EN03-2007,the pedestrian excitation load is obtained.The dynamic characteristics and peak acceleration response of the structure before and after the setting of the TMD dampers are analyzed and compared to analyze the impact on the comfort level of the bridge structure,which provides reference for the similar projects in the future.