大跨混凝土拱桥基础形式设计及结构验算方法探讨

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发布时间：2022-07-03

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商要：某370 m 跨上承式混凝土拱桥为一无铰拱桥,基础形式设计以及结构验算方法影响到结构整体受力
性能利安全性。文章介孩桥总体布置、施工方法以及桥位地质地形特征,在此基础上推出 1 3 3 种基础形
式方案.阐方案的特点以及平立面布置。在综合比较工程量工程复杂段及工程风险的基础上推荐
丁服岩基础形式，并通明其优缺点文章还列举了现有设计规范手册申的础的结构验算方法.比较！
2种嵌看深度时计算方法,提出考虑拱列男力时计算方法集于安全。文章还强問锨君深度基础深度外达
必须验算轴力以及自身截面强度并给出计算要点。
关键词:混凝土拱桥；基础设计；嵌岩基础
中国分类号：U24
文献标志码:A
Discussion on Foundation Form Design and Structure Checking Method
of Long Span Concrete Arch Bridge
YAO Nan
(China Railway Eryuan Engineering Group Co., Ltd., Chendu 610031, China）
Abstract:A deck concrete arch bridge with a span of 370 m is a hingeless arch bridge, its foundation form design ar
structure computation methods will effect the structural behavior and safety of the bridge. In this paper, general layou
construction methods and seological charscteristics of the brdge site are introduced firstly and three foundation for
schemes are proposed for comparison with their characters, plane and facade layouts. Rock-socketed foundation is re
engineering complexity and engineering risk. Subsequently checking computation methods of the rock-socketed found
with consideration of arch springing shearing force is considered safer. At last, checking computations of axial force ar
scction strength are emphasized in the paper besides depth checking, and calculated main points shall be given
Key words:concrete arch bridge；foundation design；rock - socketed foundation
1 工程概况
4×3800
3×3800
4x3.800
1
某上承式混凝土拱桥为一双线铁路无铰拱桥,横
跨某山涧深谷,其跨度设置为370 m,矢跨比为
37.000
1/4.512,桥面宽度为12.6m。该桥总体布置
图。其中拱轴曲线采用拱轴系数m=5的悬链线。
(a)立面图(cm)
拱圈结构采用分岔的提篮拱形式,2片拱肋内倾角为