双肢薄壁墩刚构桥上无缝线路的有限元分析  

Finite Element Analysis for the Continuously-welded Rail on a Frame Bridge with Two Slender Piers

作　　者：江万红[1] 唐进锋[1] 朱彬[2] 李保友[3] 

机构地区：[1]中南大学,长沙410075 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]中国中铁二院工程集团有限责任公司,成都610031

出　　处：《都市快轨交通》2008年第4期46-50,共5页Urban Rapid Rail Transit

摘　　要：建立两种以轨道、桥梁、支座、墩台、基础为整体结构的纵向附加力计算有限元模型,计算某特大型双肢薄壁墩刚构桥纵向附加力。计算伸缩力时采用平面有限元模型,同时对线路纵向阻力与梁温差进行参数影响分析;计算断轨工况时,建立半空间有限元模型以反映实际工况,对断缝大小进行准确计算;运用移动加载瞬态分析法,采用平面有限元计算模型,计算绘制钢轨挠曲力包络图,同时求得挠曲力计算的最不利加载位置。Two finite element models are established to calculate the additional longitudinal forces of the integrated system consisting of track, beams, abutments, piers and foundation, and the additional longitudinal forces of a big frame bridge with two slender piers are calculated. The expansion forces are computed by adopting a plane model with the influence of longitudinal resistance and the difference in temperatures in the beam considered and analyzed. When one disjunction appears on one rail, a half-space model is established to calculate the rail gap accurately. Based on transient dynamic analysis for motion loading, maximum bending forces are calculated by adopting plane model, and the envelope of the bending forces is drawn thereupon.

关 键 词：刚构桥 桥上无缝线路 纵向附加力 有限元 

分 类 号：U211.1[交通运输工程—道路与铁道工程] U443.22[建筑科学—桥梁与隧道工程]