某大跨异型独塔斜拉桥关键节点空间应力分析

某异型独塔斜拉桥主跨225m，设计中塔梁固结段和后锚点为关键构造节点。为确保关键节点结构设计的安全可靠，采用有限元方法建立空间板壳元模型，分析受力异常复杂的塔梁固结段和后锚点区域空间应力分布情况。分析结果表明：塔梁固结段总体满足受力要求，但局部应力集中现象比较严重，设计中应引起重视；后锚点结构整体应力水平不高，局部构造设计安全合理。

Spatial Stress Analysis for Key Joints of Long Span Special-Shaped Cable-Stayed Bridge with Single Pylon

A special-shaped cable-stayed bridge has a main span of 225 m. Both of the fixed zone between pylon and girders and the back anchorage zone are key joints of the bridge. For the sake of safety of the key joints, finite element method is adopted to analyze the spatial stress distribution of the key joints with the shell elements. The results indicate that the fixed zone between pylon and girders can generally meet the stress requirement but the stress concentration is relatively severe and special attention to it is suggested for design. The back anchorage zone has a low global stress level, and the local structure design is safe and rational.