摘要
为降低太阳辐射对纵连结构无砟轨道的影响,采用反射隔热材料实地应用研究,建立有限元模型分析反射隔热材料对太阳辐射在纵连结构无砟轨道温度和应力影响。研究结果表明,反射隔热材料可将轨道板(道床)表面温度降低10℃以上,混凝土内部温度梯度降为60℃/m,轨道板(道床)应力降低到9.5 MPa,有效降低纵连无砟轨道结构纵向应力和垂向位移,对防治因太阳辐射造成的纵连无砟轨道结构上拱病害有较好效果。
To reduce the influence of solar radiation on the ballastless track of the longitudinal structure,a reflective heat insulation material was used on the ballastless track for field test.A calculation model of solar radiation and the longitudinal structure were established to analyze the influence of the reflective heat insulation material on the temperature,longitudinal stress and vertical displacement of ballastless track by solar radiation.The results show that the reflective heat insulation material can reduce the temperature of the surface of track slab(track bed)by more than 10℃,reduce the internal temperature gradient of the concrete to 60℃/m,and reduce the stress of the track slab(track bed)to 9.5 MPa.The material can effectively reduce the longitudinal stress and vertical displacement of the longitudinal ballastless track structure and prevent the arch damage of the longitudinal ballastless track structure caused by solar radiation.
作者
王鑫
贡照华
丁宇
冀磊
赵静存
吴琛
WANG Xin;GONG Zhaohua;DING Yu;JI Lei;ZHAO Jingcun;WU Chen(Metals&Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Nanjing Line&Bridge Section,China Railway Shanghai Group Co.,Ltd.,Nanjing 210000,China;Nanchang High-speed Railway Maintenance Section,China Railway Nanchang Group Co.,Ltd.,Nanchang 330103,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2022年第8期93-98,共6页
Journal of the China Railway Society
基金
中国铁路总公司科技研究开发计划(2017G010-A)。
关键词
反射隔热
纵连结构无砟轨道
温度
温度梯度
应力
上拱
reflective heat insulation
ballastless track of the longitudinal structure
temperature
stress
temperature gradient
arch.
