杭埠河特大桥挂篮结构动力特性分析  

Analysis on Dynamic Characteristics of Hanging Basket Structure of Grand Bridge over Hangbu River

作　　者：刘贵香 熊雨轩 Liu Guixiang;Xiong Yuxuan(China Railway Beijing Engineering Group Co.,Ltd.,Beijing 102300,China;Hefei University of Technology,Hefei 230009,China)

机构地区：[1]中铁北京工程局集团有限公司,北京市102300 [2]合肥工业大学,合肥市230009

出　　处：《北方交通》2024年第5期14-17,25,共5页Northern Communications

摘　　要：为计算大跨度桥梁宽幅菱形挂篮结构在不同工况下的自振频率,以徽州大道南延工程(庐江段)跨杭埠河矮塔斜拉桥主梁施工挂篮为研究对象,考虑荷载不利工况和行走不利工况对挂篮结构动力特性的影响。采用有限元软件建立两种工况下的有限元模型,模拟桥梁挂篮全过程施工最不利情况。结果表明,处于浇筑不利工况下的挂篮基频为0.329Hz,处于行走不利工况下的挂篮基频为0.752Hz;不同施工工况下大部分振动表现为底栏系统和内外滑梁的振动,说明底栏纵梁、下横梁、内外滑梁刚度不足,应适当提高底栏纵梁、下横梁、内外滑梁的刚度,保证结构安全。In order to calculate the natural vibration frequency of the wide diamond-shaped hanging basket structure of the long-span bridge under different working conditions,taking the hanging basket in the construction of the main girder of the extradosed cable-stayed bridge over Hangbu river in the southern extension project of Huizhou avenue(Lujiang section)as the research object,the influence of unfavorable load condition and unfavorable moving condition on the dynamic characteristics of the hanging basket structure is considered.The finite element software is used to establish the finite element models of the two kinds of working conditions,and the most unfavorable situation in the whole process construction of the hanging basket of the bridge is simulated.The results show that,the basic frequency of the hanging basket is 0.329Hz under the unfavorable pouring condition and 0.752Hz under the unfavorable moving condition.Most of the vibration under different construction conditions is the vibration of the bottom bar system and the inner and outer sliding girders,which indicates that the stiffness of the bottom rail longitudinal girder,the lower horizontal girder,and the inner and outer sliding girders is insufficient,and it should be appropriately improved to ensure the structural safety.

关 键 词：桥梁挂篮 有限元模型 动力特性 

分 类 号：U445.466[建筑科学—桥梁与隧道工程]