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.
出处
《都市快轨交通》
2008年第4期46-50,共5页
Urban Rapid Rail Transit
关键词
刚构桥
桥上无缝线路
纵向附加力
有限元
frame bridge
continuously-welded rail on bridge
additional longitudinal forces
finite element
