怀化鸭嘴岩大桥主桥设计方案研究

Research on Design Scheme of Main Bridge of Yazuiyan Bridge in Huaihua

摘要:

怀化鸭嘴岩大桥主桥为（200+74+45）m曲线独塔双索面混合梁斜拉桥，对大桥的结构体系、主塔结构型式、主跨主梁结构型式及主梁压重设置等进行研究，并建立了空间有限元模型对结构进行分析。结果表明：采用斜腿与主梁固结，主塔处设置支座的新型组合式刚构体系，显著优化结构整体受力；主塔采用钢-混混合结构，主梁采用混合梁结构，可提高结构的耐久性，同时减少工程造价；主梁压重设置在腿梁固结处，有利于减少塔底不平衡弯矩，改善斜腿及基础的受力。

Abstract:

The main bridge of Yazuiyan Bridge in Huaihua is a curve single-pylon double-plane hybrid girder cable-stayed bridge with span arrangement of (200+74+45) m. The structural system of the bridge, the structural style of the main pylon, the structural styles of main span and main girder, and the weight setting of main girder are studied, and the spatial finite element model is established to analyze the structure. The results show that the application of the new combined rigid-frame system of solidifying the inclined leg and the main girder, and setting the supports at the main pylon can significantly optimize the overall stress of the structure. The steel-concrete composite structure is used for the main pylon, and the main girder is the hybrid girder structure, which can improve the durability of the structure and also reduce the engineering cost. The weights of the main girder are set at the consolidation of the inclined leg and the main girder, which is helpful to reduce the unbalanced bending moment of the pylon bottom and improve the stress of the inclined leg and foundation.