摘要
郑州万滩黄河公铁大桥主桥(112+6×168+112) m连续钢桁梁的结构复杂,跨度大,温度敏感性高,为了保证无砟轨道线形满足设计及规范要求,在无砟轨道施工前对连续钢桁梁进行施工线形控制试验,测量其施工挠度。采用MIDAS/Civil软件建立有限元模型得到理论挠度。对比挠度的实测值和理论计算值,从而修正有限元模型中连续钢桁梁的理论刚度,制定无砟轨道施工线形控制措施。结果表明,连续钢桁梁挠度的理论计算值是实测值的1.35倍,应将理论刚度增大到原设计值的1.35倍。为了能够较为准确地预测出无砟轨道的施工挠度,应不断修正有限元模型中连续钢桁梁的理论刚度。
The main bridge of Zhengzhou Wantan Yellow rail-cum-road bridge is(112 + 6 × 168 + 112) m continuous steel truss girder,which has complex structure,long span and high temperature sensitivity.In order to ensure that the alignment of ballastless track meets the design and specification requirements,the construction alignment control test of continuous steel truss girder was conducted before the construction of ballastless track to measure its construction deflection.The finite element model was established by MIDAS/Civil software to obtain the theoretical deflection.Compare the measured value and theoretical value of deflection,so as to correct the theoretical stiffness of continuous steel truss girder in the finite element model,and formulate the alignment control measures for ballastless track construction.The results show that the theoretical value of the deflection of continuous steel truss girder is 1.35 times of the measured value,and the theoretical stiffness should be increased to 1.35 times of the original design value.In order to accurately predict the construction deflection of ballastless track,the theoretical stiffness of continuous steel truss girder in the finite element model should be continuously revised.
作者
赵汗青
王小勇
金令
王海彬
杨登辉
ZHAO Hanqing;WANG Xiaoyong;JIN Ling;WANG Haibin;YANG Denghui(China Railway Engineering Consulting Group Co.Ltd.,Beijing 100055,China;China Railway Major Bridge First Engineering Group Co.Ltd.,Zhengzhou 450003,China)
出处
《铁道建筑》
北大核心
2023年第1期32-35,共4页
Railway Engineering
基金
中国中铁股份有限公司科技研究开发计划(2019-重大-01)
中铁工程设计咨询集团有限公司科技开发项目(研2019-66)。
关键词
公铁两用桥梁
连续钢桁梁
线形控制
无砟轨道
现场试验
有限元分析
刚度修正
rail-cum-road bridge
continuous steel truss girder
alignment control
ballastless track
field test
finite element analysis
stiffness correction
