摘要
为提升附加栏杆阻尼系统的应力带桥竖向减振效果,提出2种全局优化设计方法,即基于模态阻尼比的优化方法和基于H2范数的优化方法。首先,建立了应力带桥栏杆阻尼系统有限元模型,分析了阻尼系数对应力带桥动力特性的影响。其次,基于所提出的2种优化方法设计了栏杆阻尼器布置位置及阻尼系数。最后,以一座人行应力带桥为例对2种优化方法的控制效果进行了对比分析。结果表明,对于2种不同的栏杆阻尼系统优化方案,应力带桥竖向加速度及位移响应都明显减小,比较应力带桥跨中节点响应发现,基于模态阻尼比的优化方案加速度响应较小,而基于H2范数的优化方案位移响应较小。可见提出的优化方法可以显著提高应力带桥在人群荷载作用下的减振效果。
To enhance the vertical vibration reduction performance of the stress-ribbon bridge with additional railing damping system,two overall optimization design methods were proposed:the modal damping ratio-based optimization method and the H2 norm-based optimization method.Firstly,a finite element model of the railing damping system was established to analyze the influence of damping coefficients on the dynamic characteristics of the bridge.Subsequently,the layout positions and damping coefficients of the railing dampers were designed based on the two methods.Finally,taking a pedestrian stress-ribbon bridge as an example,a comparative analysis of the control effectiveness of two methods was conducted.The results demonstrate that both optimization schemes significantly reduce the vertical acceleration and displacement responses of the stress-ribbon bridge.The response at the mid-span node of the bridge was compared to reveal that the acceleration response of modal damping ratio-based scheme was smaller.While the H2 norm-based scheme results in smaller displacement responses.The proposed optimization methods can substantially improve the vibration reduction effectiveness of stress-ribbon bridges under crowd loading.
作者
刘彬
许坤
LIU Bin;XU Kun(State Key Laboratory of Bridge Safety and Resilience,Beijing University of Technology,Beijing 100124,China)
出处
《市政技术》
2025年第8期152-159,共8页
Journal of Municipal Technology
基金
重点研发计划青年科学家项目:重大灾害下长大桥梁性能恢复机理与韧性设计理论(2022YFB2602500)
国家自然科学基金面上项目:大跨桥梁多模态涡振控制的惯容增效机制及方法(52178447)。
关键词
应力带桥
人致振动
栏杆阻尼器
优化设计
stress-ribbon bridge
pedestrian-induced vibration
railing damper
optimized design
