高速铁路大跨度中承式钢桁拱桥设计研究  

Design and Research on Large Span Half-through Steel Truss Arch Bridge of High Speed Railway

作　　者：闫岩[1] YAN Yan(China Railway First Survey and Design Institute Group Co.Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道建筑》2021年第7期31-35,共5页Railway Engineering

摘　　要：以西十(西安—十堰)高速铁路汉江特大桥1×420 m中承式钢桁拱为对象,通过建立有限元模型对中承式钢桁拱桥的桁式布置、拱轴线、内倾角、拱脚下弦杆结构、主梁结构形式等进行对比分析。结果表明:拱轴系数变化对主拱轴力的影响较小,对弯矩和偏心距的影响明显,最终选取二次抛物线作为拱轴线。拱肋内倾对结构横向稳定性影响较大,拱肋内倾角宜取3.5°。拱脚下弦杆灌注混凝土,提高了拱脚的受力性能,优化了拱脚处杆件截面。正交异性板钢箱梁作为主梁时结构性能较好。结构静动力计算结果表明,大跨度中承式钢桁拱桥可满足高速铁路运营需求。Taking 1×420 m half-through steel truss arch bridge of Hanjiang super large bridge on Xi’an-Shiyan railway as the object,the finite element model was established to compare and analyze the truss layout,arch axis,inclination angle,lower chord structure of arch foot and main girder structure of half-through steel truss arch bridge.The results show that the change of arch axis coefficient has little influence on the axial force of main arch,but has obvious influence on the bending moment and eccentricity.Finally,the quadratic parabola is selected as the arch axis.Arch rib inclination has great influence on the transverse stability of the structure,the inclination angle of arch rib is 3.5°。By pouring concrete into the bottom chord of the arch foot,the mechanical performance of the arch foot is improved,and the section of the member at the arch foot is optimized.The orthotropic steel box girder has better structural performance as the main girder.The static and dynamic calculation results show that the large span half-through steel truss arch bridge can meet the operation requirements of high speed railway.

关 键 词：高速铁路桥梁 中承式钢桁拱桥 结构参数 数值模拟 方案研究 

分 类 号：U448.224[建筑科学—桥梁与隧道工程] U448.13[交通运输工程—道路与铁道工程]