Theoretical Study on Fatigue Stress Spectrum of Longitudinal Connected Slab Track on Bridge
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摘要: 为获得服役期间桥上纵连板式无砟轨道疲劳应力谱计算理论,考虑无砟轨道钢筋与混凝土的相互作用、无砟轨道混凝土的开裂与闭合效应、无砟轨道荷载的共同作用和时变特性，分别建立和验证了桥上纵连板式无砟轨道温度场计算模型、多尺度高速列车-纵连板式无砟轨道-桥梁三维有限元耦合动力学模型、纵连板式无砟轨道-桥梁-桥梁墩台纵向相互作用模型，并在此基础上，提出了桥上纵连板式无砟轨道疲劳应力谱计算理论.研究结果表明：利用提出的疲劳应力谱计算理论可得到服役期间桥上纵连板式无砟轨道各部件钢筋与混凝土应力时程曲线及疲劳应力谱；考虑多种荷载工况，能深入探讨桥上纵连板式无砟轨道疲劳破坏机理和影响规律；计算理论可为丰富和完善我国无砟轨道设计理论提供重要依据.Abstract: To obtain the fatigue stress spectrum, the calculation theory is proposed for longitudinally connected slab tracks on a bridge during service life. The temperature field calculation model of longitudinally connected slab tracks, the multi-scale high speed train-longitudinal connected slab track-bridge three-dimensional finite element coupling dynamic model, and the longitudinal connected slab track-bridge-piers and abutments longitudinal interaction model, which considers the interaction between steel bars and concrete in ballastless tracks, the crack and closure effects of concrete in the ballastless track, as well as the combined effects and time-varying characteristics of loads of the ballastless track, were established and verified. On the basis of these verifications, the calculation theory of the fatigue stress spectrum of longitudinally connected slab tracks on a bridge was proposed. The following conclusions were obtained: firstly, the stress time history and fatigue stress spectrum of steel bars and concrete in a ballastless track during service life can be obtained using the proposed calculation theory; secondly, the calculation theory can consider various loads and investigate the fatigue failure mechanism and its influence on depth; and lastly, the calculation theory can provide an important basis for enriching and perfecting the design theory of ballastless tracks in China.
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图 3 纵向荷载作用下桥上纵连板式无砟轨道纵向力学模型示意
Figure 3. Schematic of longitudinal mechanical model of longitudinal connected slab track under longitudinal loads
图 4 无砟轨道疲劳应力谱计算流程
Figure 4. Calculation flowchart for fatigue stress spectrum of slab track
图 5 轨道板温度时程和顶底面不均匀温差时程
Figure 5. Time-history of slab temperature and temperature difference between top and bottom surface of slab
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