摘要
为了掌握我国高速铁路长期运营后声屏障结构动力响应性能变化情况,更好地进行运营期声屏障的安全评估和高速铁路桥梁声屏障设计,通过现场试验及与运营初期的数据对比,得到运营期动车组高速通过时桥梁声屏障气动荷载及结构动力响应的变化规律。结果表明:动车组高速通过时声屏障结构表面承受气动荷载显著;列车风压对声屏障不同位置的变形和应力的影响程度不同,单元板位移大于立柱,立柱应力大于单元板;高速铁路运营10年后,单元板和立柱最大位移增大而最大应力减小,表明声屏障结构长期承受交变荷载后可能出现承载能力下降问题。建议设计时考虑运营期声屏障疲劳劣化所带来的影响,优化结构疲劳设计指标。
In order to master the dynamic response performance changes of the sound barrier structure after the longterm operation of high speed railway in China,for a better safety assessment of the sound barrier and the design of the sound barrier of high speed railway bridge during the operation period,the variation law of the aerodynamic load and structural dynamic response of the bridge sound barrier were obtained through the field test and the data comparison in the initial operation period when EMUs pass at high speed during operation period.The results indicate that the aerodynamic load on the surface of the sound barrier structure is significant when the EMU passes at high speed.The influence of train wind pressure on the deformation and stress at different positions of the sound barrier is different.The displacement of the unit plate is greater than that of the column,and the stress of the column is greater than that of the unit plate.After 10 years operation of high speed railway,the maximum displacement of unit plate and column increases and the maximum stress decreases,which reveals that the bearing capacity of sound barrier structure may decline after long-term bearing alternating load.The influence of the fatigue deterioration of the sound barrier during the operation period should be considered in the design to optimize the structural fatigue design index.
作者
朴爱玲
尹皓
伍向阳
刘兰华
陈迎庆
PIAO Ailing;YIN Hao;WU Xiangyang;LIU Lanhua;CHEN Yingqing(Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;Energy Saving&Environmental Protection&Occupational Safety and Health Research Institute,China Academy of Railway Sciences Coporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2021年第1期5-7,共3页
Railway Engineering
基金
中国国家铁路集团有限公司科技试验项目(SY2016Z001)
中国铁道科学研究院集团有限公司基金(2019YJ161)。
关键词
高速铁路
气动效应
现场试验
声屏障
运营期
气动荷载
high speed railway
aerodynamic effect
field test
sound barrier
operation period
aerodynamic load
