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针对我国高速铁路桥上采用的板式无砟轨道普遍存在线间排水困难和板底易出现横向裂缝问题,提出一种新型双孔型板式无砟轨道,采用有限元软件ANSYS建立三维空间模型,分析在2种不同工况下新型轨道板的应力、变形和承载力性能,并在组合外力矩作用下进行预应力非对称配筋设计。研究结果表明,新型双孔型板式无砟轨道可以有效解决线间排水困难问题,与普通无砟板式轨道相比,新型轨道板具有更好的稳定性;在竖向荷载作用下,双孔型轨道板的最大应力、位移和裂缝宽度均满足设计要求;在配筋总量相对较少的情况下,轨道板的非对称预应力筋设计可以有效减小板底裂缝最大宽度,板底抗裂程度相对于普通轨道板增大33.3%,增强了轨道板的耐久性,且经济性能良好。
In order to solve the problem that there is a common problem of horizontal drainage in the slab ballastless track on the high-speed railway bridge in our country and the lateral cracks appear easily on the slab bottom, a new double-hole slab ballastless track is proposed. The three-dimensional space model is established by using finite element software ANSYS. The stress, deformation and bearing capacity of the new type of track slab under two different operating conditions are studied. Asymmetric prestressed reinforcement design is carried out under the combined external moment. The results show that the new two-hole plate ballastless track can effectively solve the problem of drainage between the lines, compared with the common balustrade track, the new track plate has better stability; under vertical load, double-hole type The maximum stress, displacement and crack width of the track slab meet the design requirements. In the case of a relatively small total amount of reinforcement, the asymmetric prestressing tendon design of the track slab can effectively reduce the maximum width of the crack at the bottom of the slab, The degree of relative increase of 33.3% compared with the ordinary track plate, enhanced track plate durability, and good economic performance.