摘要
根据南平樟湖库区大桥建设条件,设计用于该桥深水桩基施工时拼装浮式平台的钢浮箱。根据设计要求及相关标准提出2种设计方案,即中底部龙骨、桁架、顶板横梁和侧板肋骨等均采用450mm肋距方钢方案和500mm肋距L形角钢方案。利用MIDAS Civil软件建立2种方案的有限元模型,计算4种工况下模型中梁单元、板单元的应力和位移变形并进行对比分析。结果表明:在4种工况下,2种设计方案的静力变形均较小,但2种方案的最大位移值和应力值相差较大;浮箱各构件的最大应力值远小于Q235B钢材的屈服强度值;L形角钢方案中构件的应力分布较方钢方案均匀。根据分析结果,该桥浮箱采用L形角钢方案,经现场测试和使用表明,浮箱具备良好的安全性和实用性,整体性能良好。
In compliance Bridge in Nanping, the steel with the construction conditions floating tanks for assembling of of the Zhanghu Reservoir Area the floating working platform for construction of the deepwater pile foundations of the bridge were designed. Based on the design requirements and the relevant technical standards, 2 types of the design schemes for the floating tanks were proposed, i.e. the scheme of the square steels of 450 mm rib spacing and the scheme of the L-shape angle steels of 500 mm rib spacing were to be respectively adopted for the middle and bottom keels, truss, top plate cross beams and side plate ribs of a floating tank. The soft- ware MIDAS Civil was used to establish the finite element models for the two schemes and the stress and displacement deformation of the beam elements and plate elements of the models under the 4 load cases were compared and analyzed. The results of the calculation and analysis indicate that under the 4 load cases, the static force deformation of the two schemes is little, however, the maximum displacement and stress values differ greatly. The maximum stress values of the va- rious components of the floating tanks are far less than the yield strength of the Q235B steel and the stress distribution of the components of the scheme of the L-shape angle steels is more uni- form than that of the scheme of the square steels. As a result, it is determined that the scheme ofthe L-shape angle steels should be adpoted for the floating tanks. The field testing and application of the floating tanks of the bridge prove that the tanks have good safety and practicability and the global performance of the tanks is good.
出处
《桥梁建设》
EI
CSCD
北大核心
2014年第2期85-90,共6页
Bridge Construction
基金
教育部高等学校博士学科点专项科研基金(20104301120004)
教育部科学技术重点项目(211127)
湖南省教育厅优秀青年项目(10B105)~~
关键词
桥梁工程
桩基础
钢浮箱
载重比
有限元法
方案
设计
bridge engineering
pile foundation
steel floating tank
load bearing ratio
finiteelement method
scheme
design
