简支钢箱梁自由振动影响因素分析  

ANALYSIS OF INFLUENCE FACTORS ON VIBRATION OF SIMPLY SUPPORTED STEEL BOX GIRDER

作　　者：娄升升 焦明东 李思达 LOU Shengsheng;JIAO Mingdong;LI Sida(Henan Expressway test and Inspection Co.,Ltd.,Zhengzhou 450121,China;Shanghai Tongji Testing Technology Co,Ltd,Shanghai 200092,China;Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]河南高速公路试验检测有限公司,郑州450121 [2]上海同济检测技术有限公司,上海200092 [3]郑州大学,郑州450001

出　　处：《低温建筑技术》2023年第5期143-146,共4页Low Temperature Architecture Technology

摘　　要：钢箱梁在跨越结构中得到了较为广泛的应用,为了解其承载性能及服役状况,振动性能亟待得到更多研究。文中首先对钢箱梁桥上部结构的无阻尼振动进行了理论分析,然后基于某简支钢箱梁项目,通过有限元模型与文献钢箱梁的振型和频率变化趋势进行了验证性对比分析;基于结构频率的敏感性参数如桥面铺装厚度、配重大小、配重位置和预应力数量进行了系统分析,结果显示桥面铺装、跨中配重对结构自振频率影响较大,铺装厚度、墩顶配重和预应力数量的影响较小。文中系统研究了钢箱梁振动频率的影响因素,研究结果为钢结构桥梁的推广提供一定参考。Steel box girders have been widely used in spanning structures,the vibration performance of which needs to be studied to obtain the bearing capacity and service conditions.The theoretical analysis of the undamped vibra-tion of the superstructure of a steel box girder bridge is firstly conducted.Then based on a simple supported steel box girder project,a confirmatory comparative analysis of the vibration mode and frequency variation trend of the steel box girder is conducted through a finite element model,the results from which are compared with ones from oth-er publications.The bridge deck pavement thickness,counterweight size,counterweight location,and prestress quan-tity are studied.The results show that bridge deck pavement,midspan counterweight,and prestress quantity have a significant impact on the natural vibration frequency of the structure,while pavement thickness,pier top counter-weight,and prestress quantity have a small impact.This paper systematically studies the factors influencing the vi-bration frequency of steel box girders,and the results may provide the reference for the promotion of steel structure bridges.

关 键 词：简支钢箱梁 固有频率 质量矩阵 刚度矩阵 预应力数量 

分 类 号：TU391[建筑科学—结构工程]