平板和框架板无砟轨道结构力学分析

Mechanical Analysis of Structures of Plane Slab and Frame Slab for Ballastless Track

研究目的:平板和框架板无砟轨道是板式无砟轨道的2种基本型式,研究它们在荷载作用下力学响应的差异,为设计、施工提供参考。研究方法:采用有限元理论,建立了平板和框架板无砟轨道的梁-板模型,应用大型有限元工具软件ansys对模型进行求解。研究结果:选用相同的参数进行计算,得出了平板和框架板无砟轨道结构各部分受力的差别,以及荷载作用位置对板式无砟轨道结构受力的影响规律。研究结论:(1)在相同的荷载作用下,框架板无砟轨道除底座纵向正弯矩较平板无砟轨道较小外,轨道板纵横向弯矩、底座纵向负弯矩、底座横向弯矩、CA砂浆调整层反力均较大。(2)仅从轨道结构受力来看,框架板跟平板差异不显著,但由于框架板具有良好的经济性,改善施工性能等优点,在国内具有很大的发展前景。(3)荷载作用位置对无砟轨道结构各部分受力影响很显著,荷载作用于板中和板端为2种最不利作用情况,在无砟轨道结构设计中,应该综合这2种荷载作用方式下的较大值进行设计。

Research purposes： Plane slab and frame slab ballastless tracks are two basic kinds of slab ballastless track. The mechanical differences between these two ballastless track structures acted by loads are studied and references can be offered to design and construction. Research methods： Using finite element theory, beam - slab models of plane slab and frame slab ballastless tracks are built, the model calculation is caught by the finite element tool software ANSYS. Research results：Same parameters are adopted to make the mechanical results out, the mechanical distinctness between plane slab and frame slab ballastless track structures is obtained, the effects on slab track conduced because different action position by loads is researched, too. Research conclusions： （ 1 ） Under the action of same loads, except the longitudinal positive moment of pedestal, longitudinal and transverse moment of slab, longitudinal negative moment of pedestal, transverse moment of pedestal and reaction of CA mortar are larger for frame slab ballastless track than those for plane ballastless track. （2） When considering the mechanical response, there are few differences between frame slab track structures and plane slab structures, but frame slab structures hold many other advantages, such us cost saving, improving construction capability and so on, which make frame slab ballastless track meet a bright foreground in China. （3） The position acted by loads influenced greatly on mechanical action of ballastless track structures, the middle of slab and the border of slab are two worst load action positions, so the larger value brought by those two load action ways should be taken in ballastless track structures design.