Static performance test of new separated beam-track slab structure for high-speed maglev
Article Text (Baidu Translation)
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摘要: 为解决高速磁浮梁轨一体轨道梁制造工序复杂、施工难度大及轨面线形调整困难等问题，提出一种桥梁与轨道分离式(简称“梁轨分离式”)轨道板；为了解新型梁轨分离式轨道板的静力性能，设计并开展了足尺模型试验，测量纵横梁式混凝土轨道板、钢筋和钢扣件系统在不同荷载下的位移和应力，分析了其承载能力、破坏特征和关键部位应力分布规律；基于有限元软件ABAQUS建立轨道板精细化数值模型，开展了设计参数敏感性分析，研究了钢筋直径和栓钉直径对新型轨道板静力性能的影响，对比不同钢筋直径和栓钉直径下轨道板的位移及各部件应力分布，给出了新型轨道板结构参数的合理取值。研究结果表明：在设计荷载下，轨道板处于线弹性阶段，位移峰值为0.11 mm；在3倍设计荷载下，混凝土横梁首次出现微裂缝；在5倍设计荷载下，新型轨道板仍处于带裂缝工作阶段，位移峰值为0.46 mm，小于规范容许值0.516 mm；新型梁轨分离式轨道板的承载力满足设计要求，承载力具有较高富余量；在正常运营状态下，磁浮列车荷载主要由混凝土轨道板承受，轨道板各构件受力明确，局部效应明显；适当增加钢筋直径可提高轨道板整体刚度，减小各构件的应力；增加栓钉直径对轨道板静力性能影响较低。研究结果可为新型梁轨分离式轨道板设计提供参考。Abstract: To address the complex manufacturing process, high construction difficulty, and difficulty in adjusting track surface alignment in the integrated beam-track structure for high-speed maglev, a new separated beam-track slab (abbreviated as separated beam-track slab) was proposed. A full-scale model test of the separated beam-track slab was designed and conducted to characterize its static performance. Displacement and stress of the grid concrete slab, reinforcement, and steel fastener system under various load levels were measured. Bearing capacity, failure characteristics, and stress distribution in critical regions were analyzed. A refined finite element model of the slab was established using ABAQUS. Sensitivity analyses were performed for structural parameters. Effects of reinforcement diameter and shear stud diameter on static performance were investigated. Displacements and stress distributions under different diameters were compared, and reasonable structural parameters were suggested. Analysis results show that the slab is in a linear elastic state under the design load, with a peak displacement of 0.11 mm. The concrete lateral beam shows micro-cracks for the first time under three times the design load. Under five times the design load, the slab remains operable in a cracked state, with a peak displacement of 0.46 mm, which is below the allowable limit of 0.516 mm. The slab meets the design requirement and has a sufficient capacity margin. Under normal operational state, the maglev train load is mainly borne by the concrete slab. Stress mechanisms of components are clear, and local effects are apparent. Increasing reinforcement diameter can enhance global stiffness and reduce component stress, while shear stud diameter has a minimal effect on static performance. These findings provide reference values for the design of the new separated beam-track slab.
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图 3 混凝土位移测点布置(单位：mm)
Figure 3. Layout of concrete displacement measurement point (unit: mm)
图 8 两种加载方式下轨道板位移云图
Figure 8. Displacement contour maps of track slab under two loading conditions
图 14 试验实测数据与有限元模型数据对比
Figure 14. Comparison of test measured data and finite element model data
表 1 钢材力学性能
Table 1. Mechanical properties of steel
试件 试件平均厚度/mm 屈服强度/MPa 抗拉强度/MPa 弹性模量/GPa 滑行板 10 304 448 204 钢扣件 20 376 525 225 
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表 2 不同钢筋直径下混凝土轨道板受力
Table 2. Stresses of concrete track slab under different reinforced diameters
纵向受力钢筋直径/mm 16 20 纵横梁式混凝土轨道板最大位移/mm 0.088 0.085 混凝土横梁最大拉应力/MPa 1.073 1.012 混凝土横梁最大压应力/MPa 4.817 4.600 纵梁受力钢筋最大Mises应力/MPa 1.895 1.783 横梁受力钢筋最大Mises应力/MPa 4.451 4.086 栓钉最大Mises应力/MPa 12.850 12.270
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表 3 不同栓钉直径下混凝土轨道板受力
Table 3. Effects of different bolt diameters on the concrete track slab
栓钉直径/mm 16 20 纵横梁式混凝土轨道板最大位移/mm 0.088 0.087 混凝土横梁最大拉应力/MPa 1.073 1.046 混凝土横梁最大压应力/MPa 4.817 4.881 纵梁受力钢筋最大Mises应力/MPa 1.895 1.808 横梁受力钢筋最大Mises应力/MPa 4.451 4.294 栓钉最大Mises应力/MPa 12.850 12.556
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