半径大吨位宽箱梁转体桥承台与桩基受力分析  

FORCE ANALYSIS ON CAP AND PILE FOUNDATION OF SMALL RADIUS AND LARGE TONNAGE WIDE BOX GIRDER ROTATING BRIDGE

作　　者：谢祥福 Xie Xiang-fu

机构地区：[1]广东省铁路规划设计研究院有限公司,广州510000

出　　处：《建筑技术开发》2024年第2期100-102,共3页Building Technology Development

摘　　要：为得到采用转体法施工的桥梁在不同施工阶段上下承台以及桩基的应力分布情况,通过使用有限元软件ANSYS分别模拟了桩基施工、承台施工、承台钢束张拉及转体前等施工阶段的方法研究了转体法施工的桥梁在不同施工阶段上下承台及桩基的受力状态。结果表明:承台采用设置纵横向预应力的方式改善了大吨位转体桥梁上下承台及桩基的受力状态,避免了上下承台及桩基的开裂;经过计算降低了上下承台的厚度,减少基坑开挖深度;目前项目已顺利通车,从理论到成功实践,证实了设计的合理性及科学性。对类似大尺寸承台及桩基受力分析提供可靠的参考。In order to obtain the stress distribution of the upper and lower caps and pile foundation of the bridge constructed by the rotary method at different construction stages,The stress state of the upper and lower caps and pile foundations in different construction stages of the bridge constructed by the rotary method is studied by simulating the construction stages of pile foundation construction,cap construction,cap steel bundle tensioning and roll forward by using the large general finite element software ANSYS.The results show that the stress state of the upper and lower caps and pile foundations of the large-tonnage rotary bridge is greatly improved by the method of setting vertical and horizontal prestress on the caps,and the cracking of the upper and lower caps and pile foundations is avoided.Through calculation,the thickness of upper and lower bearing table is reduced and the excavation depth of foundation pit is reduced.At present,the project has been successfully opened to traffic,from theory to successful practice,which confirms the rationality and science of the design.It can be seen that the research results of this paper provide a reliable reference for the stress analysis of similar large-size caps and pile foundations.

关 键 词：上下承台 群桩基础 预应力混凝土 转体法施工 

分 类 号：U443[建筑科学—桥梁与隧道工程]