摘要
新建蒙华铁路三门峡黄河公铁两用特大桥主桥为11跨连续钢桁结合梁桥,全长1 140 m。黄河主河槽较宽,汛期和非汛期水位变化较大,最大水位高差可达13 m。6~#墩为矩形承台,平面尺寸42.3 m×24.6 m,厚4.5 m,四周倒以圆角;围堰采用双壁钢套箱围堰,双壁钢套箱围堰平面尺寸为46.5 m×28.8 m,高度为22.9 m,壁仓厚2 m。围堰主要由侧板、水平环板、水平角钢与隔舱板组成。根据施工过程中围堰受力情况的不同及最不利状态分3个工况,采用MIDAS/Civil 2012和大型通用有限元软件ABAQUS建立各工况的有限元模型,分析围堰及封底混凝土结构的位移及应力。结果表明,在各个工况下,围堰及封底混凝土结构的最大位移及应力均小于规范允许值,满足规范要求。
The main bridge of the new built Sanmenxia Yellow River rail-cum-road super long bridge of Inner Mongolia-China railway is a 11-span continuous steel truss girder bridge with total length of 1 140 m.The Yellow River main channel is wide and f lood and non-f lood water levels vary widely.The maximum water level difference can reach 13 m.The No.6 pier is a rectangular platform and around the corner with a round angle,which plane size is 42.3 m×24.6 m,the thickness is 4.5 m.The cofferdam is a double-walled steel box cofferdam,which plane size is 46.5 m×28.8 m,the height is 22.9 m,the wall thickness is 2 m.The cofferdam is mainly composed of side plate,horizontal ring plate,horizontal angle steel and partition board.According to the different states and the most unfavorable state of the cofferdam in the construction process,it is divided into three working conditions.The MIDAS/Civil 2012 and the large scale general f inite element software ABA Q US were used to establish the models of each working condition to analyze the displacement and stress of the cofferdam and the bottom concrete.The results show that under the different conditions,the maximum displacement and stress of the cofferdam and the bottom concretes are less than the standard allowable values,and meet the requirements of the specif ication.
作者
连延金
LIAN Yanjin(China Railway Construction Bridge Engineering Bureau Group Co.Ltd.,Tianjin 300300,China)
出处
《铁道建筑》
北大核心
2018年第4期41-44,共4页
Railway Engineering
基金
天津市企业博士后创新项目择优资助计划(TJQYBSH2017010)
关键词
公铁两用桥梁
深水基础
数值计算
钢桁桥
双壁钢套箱围堰
设计
Rail-cum-road bridge
Deep water foundation
Numerical calculation
Steel truss girder
Double-walled steel cofferdam
Design
