摘要
研究目的:为探讨钢管混凝土拱桥拱轴线型对结构力学行为的影响,以某高速铁路上承式钢管混凝土拱桥为工程背景,采用Midas Civil建立有限元模型,对比分析恒载或ZK活载作用下不同拱轴线型对结构变形、内力以及稳定性的影响,并探究其影响规律,从而为高速铁路钢管混凝土拱桥的相关设计、施工和运营提供参考或借鉴。研究结论:(1)该结构具有良好的线弹性,不同荷载作用下拱轴线型对结构力学行为的影响规律保持较好的一致性;(2)拱轴线型对结构靠近拱脚区段弯矩、剪力和组合应力影响显著,对跨中区段轴力影响明显,而对L/8截面和L/2截面竖向变形影响明显;(3)高速铁路桥梁面内面外刚度要求高,整体稳定较好,失稳形式主要表现为局部杆件失稳;(4)该研究结果有助于优化钢管混凝土拱桥拱轴线选型以及结构杆件设计。
Research purposes： To investigate the axis type influence on structural mechanics behavior of concrete filled steel tubular （CFST） arch bridge, finite element models for the bridge with Midas Civil were established by taking a high - speed railway CFST arch bridge for example. The influence caused by axis type on structure deformation, internal force and stability under dead load or ZK live load were compared and analysed. Its influence law was explored as references in design, construction and operation in the CFST arch bridge area of high - speed railway. Research conclusions： （ 1 ） The structure has good line elasticity, and the influence of arch axis on structural mechanics behavior is consistent under the action of different loads. （2）The effect of the arch axis is significant on the bending moment, shear force and combined stress near the arch section and the axial force of the middle section, while the effect on the vertical deformation of L/8 section and L/2 section is significant. （3） High - speed railway bridge requires high stiffness both in plane and out of plane, and then the occurrence of instability is more likely to be the buckling of the local member since the overall stability of this type bridge is well. （4） The research results are helpful to optimize the selection of arch axis of CFST arch bridge and the design of structural members.
作者
卫星
巨云华
吴琛泰
温宗意
WEI Xing;JU Ytm - hua;WU Chen- tai;WEN Zong - yi(Southwest Jiaotong University, Chengdu, Sichuan 610031, China)
出处
《铁道工程学报》
EI
北大核心
2018年第3期45-51,83,共8页
Journal of Railway Engineering Society
基金
国家自然科学基金项目(50808150)
关键词
钢管混凝土拱桥
高速铁路
拱轴线型
拱轴系数
力学行为
concrete filled steel tubular arch bridge
high - speed railway
arch axis
arch axis coefficient
mechanical behavior
