双层索系曲线斜拉步行桥的结构分析

针对北京市顺义区减河3号景观步行桥—天目桥,详细阐述了该桥的方案比选和结构布置。基于有限元法,建立全桥的空间分析模型,对该桥进行了静力、动力分析。计算结果显示,双层索系曲线斜拉桥方案与普通曲线斜拉桥方案相比,结构的整体刚度和动力性能都得到了改善。通过本文的研究,以期为今后空间布置的双层索系以及异形钢箱梁斜拉桥在人行景观桥梁设计中的应用提供有益参考。

Analysis of a curved double-layer cable-stayed pedestrian bridge

Based on Tianmu Bridge-No.3 landscaping pedestrian bridge on Jian River in Shunyi District of Beijing,this paper expounds the design considerations, type alternatives and layout of the structural system.Finite element method is employed in this paper to establish the space analysis model of the bridge and to simulate the loading capacity and dynamic characteristics analysis.Compared with common curved cable-stayed bridge,the rigidity and dynamic characteristics of curved double-layer cable-stayed bridge acquire being further improved.The research in this paper is expected to provide helpful reference for the future design of pedestrian bridge with spacial double-layer cable system and abnormity steel box girder.