南宁大桥非对称外倾结构设计与抗震研究

The structural design and seismic researched of nanning bridge of concrete-filled steel tube with large-span arch

桥梁是城市道路交通网络的命脉,对城市交通基础设施的修建、完善起到重要意义。随着钢管-混凝土结构理论的不断发展与完善,钢管混凝土在拱桥结构中得以应用并发展迅速。然而,钢管混凝土拱桥的安全性问题,尤其是大跨度的钢管混凝土拱桥,其结构设计与抗震研究一直是目前土木工程界研究的焦点。以世界首座大跨径曲线梁、非对称外倾组合拱桥南宁大桥为例,分别从建筑构造、结构设计、抗震性能三个方面,剖析非对称外倾组合拱桥结构设计与抗震机理,并与广西南宁市对称非外倾混凝土组合拱桥——永和大桥的地震响应进行对比,为钢管混凝土拱桥结构设计方案的改进提出合理建议。

The construction of bridge is of great significance to improve the urban traffic infrastructure and road traffic network.With the continuous improvement of the theory of concrete-filled steel tube structure,the arch bridge of concrete-filled steel tube had developed rapidly.However,the structural design and seismic research of the arch bridge of concrete-filled steel tube,especially the long-span bridge,had been the focus of civil engineering research.Nanning Bridge,an arch bridge of the world s first large span curve beam and asymmetric outward tilt,was discussed.The constructional detail,structural design and seismic performance of Nanning Bridge were reached and analyzed,and the design and seismic mechanism of asymmetric inclined combined arch bridge were put forward and compared with a symmetrical non-inclined concrete composite arch bridge which is called YongHe Bridge.Which benefits for the improvement of bridge structure of concrete-filled steel tube.