大坡度宽断面桥梁同步顶升有限元优化设计分析  

Finite Element Optimization Design and Analysis of Synchronous Jacking of Bridges with Large Slope and Wide Section

作　　者：王国维 Wang Guowei(The 1st Engineering Co.,Ltd.of China Railway 22th Bureau Group,Harbin 150000,China)

机构地区：[1]中铁二十二局集团第一工程有限公司,哈尔滨市150000

出　　处：《北方交通》2024年第12期21-23,28,共4页Northern Communications

摘　　要：文章以哈尔滨东三环某老桥改造为例,应用顶升技术对既有桥梁进行顶升。通过Midas Civil有限元模拟软件进行建模,对桥梁顶升全过程进行了仿真分析。分析表明,顶升前期箱梁顶底板的最大拉压应力均在允许应力范围内,但在成桥阶段出现了危险拉应力。针对危险应力,对某几个点位的顶升值进行微调优化,发现成桥阶段箱梁底板的最大拉应力f_(tmax)降至2.9N/mm^(2),小于3.0N/mm^(2),顶升值的微调优化安全可行。Taking the reconstruction of an old bridge in the east third ring road of Harbin as an example,and the jacking technology is applied to jack up the existing bridge.The whole process of bridge jacking is simulated and analyzed by Midas Civil finite element simulation software for modeling.The analysis shows that,the maximum tensile and compressive stresses of the top and bottom plates of the box girder in the early stage of jacking are within the allowable stress range,but the dangerous tensile stresses occur in the bridge forming stage.According to the dangerous stress,the jacking value of some points is fine-tuned and optimized,and it is found that the maximum tensile stress ftmax of the bottom plate of the box girder in the bridge forming stage is reduced to 2.9N/mm^(2),which is less than 3.0N/mm^(2),and the fine-tuned optimization of the jacking value is safe and feasible.

关 键 词：桥梁 施工 模拟 顶升 优化设计 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]