某下承式系杆拱桥动力特性影响因素分析  

Analysis on Influencing Factors of Dynamic Characteristics of a Through Tied Arch Bridge

作　　者：申文杰 Shen Wenjie(Shanxi Transport Safety and Emergency Support Technology Center(Co.,Ltd.),Taiyuan 030032,China)

机构地区：[1]山西省交通运输安全应急保障技术中心(有限公司),太原市030032

出　　处：《北方交通》2023年第5期13-16,20,共5页Northern Communications

摘　　要：以某下承式系杆拱桥为依托建立迈达斯Civil有限元模型,分析了桥梁刚度、混凝土自重对动力特性的影响。结果表明:桥梁的横向刚度储备较为充足;基准组桥梁的一阶振型为竖向弯曲,且桥梁基频为0.464394rad/s,随着模态的增加,桥梁频率增加,周期降低;混凝土弹性模量的增加促使桥梁刚度增加,当桥梁刚度增加后,前六阶频率均有所提高,桥梁刚度的增加有利于提高桥梁承担动力荷载的能力;混凝土自重的增加使得前六阶频率均有所提高,自重的增加有利于提高桥梁承担动力荷载的能力。Based on a through tied arch bridge,the Midas Civil finite element model is established to analyze the influence of bridge stiffness and concrete dead weight on dynamic characteristics.The results show that:the lateral stiffness reserve of the bridge is relatively sufficient;the first mode of vibration of the bridge in the reference group is vertical bending,and the fundamental frequency of the bridge is 0.464394rad/s.As the mode increases,the bridge frequency increases and the period decreases;the increase in the elastic modulus of concrete promotes the increase in the stiffness of the bridge.When the stiffness of the bridge increases,the first six frequencies increase,and the increase in the stiffness of the bridge is conducive to improving the ability of the bridge to bear the dynamic load;the increase in the dead weight of concrete makes the first six frequencies increase,and the increase in the dead weight is beneficial to improving the ability of the bridge to bear the dynamic load.

关 键 词：系杆拱桥 动力特性 桥梁刚度 自振频率 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]