【摘要】 为了使山区大跨度桥梁设计做到结构选型合理及方案可行,在综合考虑桥址处客观条件、结构体系的受力特性和桥梁美学及景观基础上,从山区桥梁选型与造型、桥位选择方面进行分析,并对山区桥梁常用结构形式的使用条件及合理跨径进行探讨。得出以下结论:山区桥梁选型原则为大桥凭规模,中桥可造型,小桥在细节;桥位选择原则为中、小桥梁严格服从线路布设,大桥、特大桥应多方案比选,并将其作为控制点,总体上达到与线路走向一致;山区公路、铁路大跨度桥梁首选是连续梁(刚构),对于较窄的V形沟谷优先考虑拱桥,在特殊地形条件下可选择斜拉桥和悬索桥。更多还原

【Abstract】 To make sure that the structural types for the design of long span bridges in the mountainous region can be rational and the structural schemes are feasible,the structural type selection,configuration and site selection of the bridges are analyzed and the service conditions and rational span arrangement of the structural types commonly adopted for the bridges are studied on the basis of comprehensive consideration of the existing site conditions,structural system force conditions,aesthetics and landscape functions of the bridges.In accordance with the analysis and study,the conclusions are drawn as follows:the principle of the structural type selection for a major bridge in the mountainous region is dominated by the scale,for a medium bridge is by the configuration while for a small bridge is by the details.The principle of the site selection for the bridges in the mountainous region is that the arrangement of the medium and small bridges should strictly abide by the route alignments,however,for the arrangement of the major bridges,there should multiple schemes for comparison and choice,the bridges should be regarded as the control points and generally should keep up with the route alignments.Wherever the long span highway and railway bridges are built in the mountainous region,the structural types of the continuous girder(rigid-frame) bridges should be the first choice.When a bridge is to be built over the narrow V-valley,the priority should be given to the arch bridge while at the site with special topographic conditions,the cable-stayed bridge or suspension bridge may be selected.更多还原