兴国县凤凰大桥设计浅析

Brief Analysis on Design of Xingguo County Fenghuang Bridge

兴国县凤凰大桥主桥采用30 m+50 m+30 m变截面预应力混凝土梁拱组合结构,主墩墩高6.5 m,墩身采用实体薄壁矩形墩,两侧设拱脚支腿与主梁刚接。通过对该桥梁拱结合段主梁进行受力计算分析,分析该类桥型结构受力不合理的原因,并提出拱顶梁段底缘钢束配置优化方案,为今后设计同类型提供参考。

The main bridge of Xingguo County Fenghuang Bridge is a 30 m+50 m+30 m variable cross-section pre-stressed concrete girder arch composite structure.Its main pier is 6.5 m high.The pier body adopts the solid thin-wall rectangular pier.The arch foot support is set up at both sides to connect the main girder.According to the stress calculation and analysis of the main girder at the combined section of the girder and arch of this bridge,the unreasonable causes of the structural stress of this bridge are analyzed,and the optimization scheme of steel cable configuration at the bottom edge of arch top girder section is proposed in order to provide the reference for the design of the similar projects in future.