双层斜腿刚构连续梁桥人致振动分析及减振设计  

Human Induced Vibration Analysis & Vibration Reduction Design of Double-Deck Skew Leg Rigid Frame Continuous Beam Bridge

作　　者：李扬帆 LI Yang-fan(Tongji University Architectural Design&Research InstituteCo.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《中国市政工程》2024年第4期40-45,151,152,共8页China Municipal Engineering

摘　　要：文章以安吉曙光桥为例,研究了这座双层桥面斜腿刚构连续梁桥的人致振动及减振设计。计算了桥梁的行人荷载及动力特性,分析了该桥的人致振动响应并进行舒适度评价。针对桥梁双层布置的特点,提出了应用连杆提高刚度、应用调谐质量阻尼器(Tuned Mass Damper,TMD)增强阻尼的减振设计思路,比较分析了3种不同的减振设计:单独设置TMD、单独设置连杆、联合设置连杆-TMD。研究结果表明:安吉曙光桥振动频率低、人致振动响应较大,需对其进行减振控制;单独布置TMD,可有效控制桥梁的振动响应;单独设置2组连杆,可显著提高桥梁的自振频率;同时设置连杆和TMD,可采用较小的TMD实现减振目标。3种减振设计均能满足舒适度要求,工程中应根据实际情况选用。Taking Anji Shuguang Bridge as an example,this paper studies the human induced vibration and vibration reduction design of this double deck skew leg rigid frame continuous beam bridge.The pedestrian load and dynamic characteristics of the bridge are calculated,and the human induced vibration response of the bridge is analyzed and the comfort degree is evaluated.According to the characteristics of double-layer arrangement of bridges,the vibration reduction design ideas of using connecting rod to improve the stifness and using Tuned Mass Damper(TMD) to enhance the damping are put forward,and three diferent vibration reduction designs are compared and analyzed:separate TMD,separate connecting rod and joint connecting rod TMD.The results show that the vibration frequency of Anji Shuguang Bridge is low and the human induced vibration response is large,so it is necessary to control its vibration reduction.The vibration response of the bridge can be effectively controlled by arranging TMD separately.Two groups of connecting rods can significantly improve the natural frequency of the bridge.By setting the connecting rod and TMD at the same time,the smaller TMD can be used to achieve the vibration reduction target.The three vibration reduction designs can meet the comfort requirements,and should be selected according to the actual situation in the project.

关 键 词：人致振动 舒适性评价 减振设计 调谐质量阻尼器 连杆 双层布置 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]