斜拱曲梁桥人致振动舒适度与减振研究  

WALKING COMFORT ANALYSIS AND VIBRATION CONTROL OF BRIDGE WITH CURVED BEAM AND INCLINED ARCH

作　　者：周健华 黄友钦[1] 刘爱荣[1] ZHOU Jian-hua;HUANG You-qin;LIU Ai-rong(Research Center for Wind Engineering and Engineering Vibration,Guangzhou University,Guangzhou,Guangdong 510000,China)

机构地区：[1]广州大学风工程与工程振动研究中心,广东广州510000

出　　处：《工程力学》2022年第S01期214-220,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51578188);高等学校学科创新引智计划项目(111计划D21021);广州市科技计划项目(201904010307);中国工程院战略咨询重点项目(2021-XZ-37)。

摘　　要：该文以首座跨越珠江的斜拱曲梁人行景观桥——广州海心桥为研究对象,系统开展其人致振动舒适度与减振控制研究。海心桥采用拱肋外倾10°的斜拱曲梁固结体系,其主拱跨度为198 m,矢跨比约为1/3.5。主桥跨中桥面宽15 m,桥面由圆弧型快、慢行道组成。由于桥梁处于高密度人群区,且结构体系柔度大、受力复杂,人行舒适度问题很突出。为此,该文建立精细化3D有限元模型,通过特征值分析确定人振动荷载敏感频率范围,判别步行力敏感模态阶数,构建对应的步行力荷载。通过时域分析法获得对应的峰值加速度阈值以及舒适度指标完成了人行舒适度评价。提出了安装质量调谐阻尼器以提高桥梁舒适度等级的减振方案,并对阻尼器的安装位置、阻尼、刚度和质量进行了优化设计,有效提高了桥梁的人行舒适度。该文研究结果可为同类型桥梁的人行桥舒适度评价提供参考。Takes the first footbridge with curved beam and inclined arch across the Pearl River,Guangzhou Haixin Bridge,as the research object,and systematically studies its human-induced vibration comfort and vibration control.The main arch span is 198 m with a sagittal-to-span ratio of 1/3.5.The bridge deck is 15 m wide in the middle of the span,and the bridge deck consists of circular fast and slow lanes.As the bridge is located in the high-density crowd area,and the structural system is flexible and complex in force,the problem of pedestrian comfort is prominent.A refined 3D finite element model is established to determine the sensitive frequency range of human-induced load through eigenvalue analysis,so that to find the modes sensitive to walking force and construct the corresponding expressions of walking forces.The evaluation of pedestrian comfort is completed by obtaining the corresponding peak acceleration threshold and comfort index through time domain analysis.A damping scheme is proposed to install tuned mass dampers to improve the comfort level of the bridge,and the installation position,damping,stiffness and mass of the dampers are optimized to improve the pedestrian comfort of the bridge effectively.The results of this paper can provide a reference for the evaluation of comfort level of pedestrian bridges of the same type.

关 键 词：斜拱曲梁人行桥 人行舒适度 时域分析法 减振控制 质量调谐阻尼器 

分 类 号：U448.11[建筑科学—桥梁与隧道工程]