斜交三跨宽连续梁桥结构刚度快速评估研究  

Research on Rapid Evaluation Method of Structural Stiffness of Skew Three-span Continuous Girder Bridge

作　　者：张玉宝 张方圆 亓兴军 杨洪超 曹三鹏 ZHANG Yubao;ZHANG Fangyuan;QI Xingjun;YANG Hongchao;CAO Sanpeng(Linyi Architectural Design and Research Inastitute Co.Ltd.,Linyi 276002,China;School of Transportation Engineering,Shandong Jianzhuu University,Jiman 250101,China)

机构地区：[1]临沂市建筑设计研究院有限责任公司,临沂276002 [2]山东建筑大学交通工程学院,济南250101

出　　处：《武汉理工大学学报(交通科学与工程版)》2025年第2期409-414,共6页Journal of Wuhan University of Technology(Transportation Science & Engineering)

基　　金：济青高速铁路有限公司科技计划项目(JQKJ2024-10);山东省交通运输厅科技计划项目(2022B06);山东省企业技术创新项目(202250101726,202160101415)。

摘　　要：本文以斜交三跨宽连续梁桥为研究对象,提出基于模态挠度的等效荷载试验方法.在桥面相应测点位置布置加速度传感器,采集环境激励下桥梁关键截面的竖向加速度时程信息,采用增强型频域分解法(EFDD)识别桥梁的模态参数,进而识别结构的位移柔度矩阵,预测桥梁在等效荷载下的模态挠度,对比设计挠度,计算挠度校验系数,结合桥梁荷载试验规范评估连续梁桥的刚度状况.结果表明:环境激励下,可以准确识别得到桥梁的低阶模态参数;中载、偏载工况下该斜交三跨连续梁桥的挠度校验系数均小于1,表明结构的刚度状况满足设计要求.Taking the skew three-span wide continuous beam bridge as the research object,an equiva-lent load test method based on modal deflection was proposed.The acceleration sensors were arranged at the corresponding measuring points on the bridge deck to collect the vertical acceleration time histo-ry information of the key sections of the bridge under environmental excitation.The enhanced fre-quency domain decomposition method(EFDD)was used to identify the modal parameters of the bridge,and then the displacement flexibility matrix of the structure was identified to predict the modal deflection of the bridge under equivalent load.By comparing the design deflection,the deflection check coefficient was calculated,and the stiffness of continuous beam bridge was evaluated in combi-nation with the bridge load test code.The results show that the low-order modal parameters of the bridge can be accurately identified under environmental excitation.The deflection check coefficient of the skew three-span continuous beam bridge under the conditions of medium load and eccentric load is less than l,which shows that the stiffness of the structure meets the design requirements.

关 键 词：模态分析 动力特性 位移柔度矩阵 等效荷载 挠度校验系数 

分 类 号：TH212[机械工程—机械制造及自动化]