摘要
为研究复杂作用条件下的道床板损伤变化规律,以混凝土塑性损伤模型为基础,对其施加温度荷载以及地铁列车-轨道耦合动力学分析下得到的外部激励,建立地铁列车-轨道-路基耦合动力学模型并进行分析。结果表明:当温度下降时,道床板会产生横向变形,其内部会产生裂缝,出现损伤并使刚度下降,混凝土材料出现软化,结构受拉承载力下降;而在随后的温度上升过程中,道床板损伤值保持不变,最终稳定在0.19左右。列车通行会加速混凝土道床板的裂缝发展,虽然当列车动荷载施加于道床板上时,其内部裂缝短暂闭合、刚度出现暂时性恢复,但由于裂缝周期性开合,最终导致混凝土道床板裂缝扩大,最后形成贯通裂缝。
To study the damage change law of ballast slab under complex conditions,through the approach of concrete plastic damage model,by applying temperature load on it and obtaining the external excitation from the metro vehicle-track coupling dynamics analysis,a train-track-subgrade coupling model is established and analyzed.The results show that when the temperature decreases,the ballast slab will produce transverse deformation and internal cracks appearance,leading to damage,stiffness decrease,concrete material softening,and the decrease of structural tensile bearing capacity.But in the subsequent temperature rise process,the damage of ballast slab remains unchanged,and is finally stabilized at about 0.19.When the train load is applied to the damaged ballast slab,the internal crack will close and the rigidity restores temporarily.However,due to the periodic opening and closing,the crack of the concrete ballast slab will develop rapidly and finally forms the penetrating crack.
作者
姚光磊
YAO Guanglei(Southwest Transportation Construction Group Co.,Ltd.,650032,Kunming,China)
出处
《城市轨道交通研究》
北大核心
2021年第10期42-47,共6页
Urban Mass Transit
关键词
地铁
双块式无砟轨道
道床板
疲劳损伤
开裂行为
多物理场耦合
metro
double-block ballastless track
track bed slab
fatigue damage
cracking behavior
multi-physical field coupling
