摘要
本文针对将既有铁路区间扩建为地上、地下单线双层铁路方案,建立铁路-大地-建筑物三维耦合动力学模型,分析列车以80 km/h的设计速度在该线路上运行对沿线不同结构形式建筑物的振动影响。研究结果表明:(1)列车上、下层线路同时运行引起的振动对建筑物的影响最大,下层线路运行引起的振动对建筑物的影响大于上层线路运行;(2)列车运行引起的振动对距离线路中心相同的砌体结构影响大于框架结构,在相同运行工况下,砌体建筑物分频最大振级比框架建筑物平均高约10.4 dB;(3)框架建筑物比砌体建筑物随楼层的增加具备更强的振动传递性;(4)列车在扩建区间内运行时,砌体结构建筑物的环境振动均超出夜间限值,其首层楼板的分频最大振级在不同运行工况下超出限值5.4~12.1 dB。研究成果可以为既有线路改扩建提供参考。
This paper focuses on a railway section expansion scheme involving at-and-below-ground vertically-stacked railway tracks,for which a 3D coupling dynamics model detailing the railways,ground,and buildings was established to analyse the impacts of vibration caused by a train moving on the line at a design speed of 80 km/h on nearby buildings of varying structures and forms along the line.The findings suggest that:(1)The vibration produced by simultaneous operation of the upper and lower railway tracks incurred the greatest impact on the buildings,with the lower track exerting a bigger impact.(2)For buildings at the same distance away from the center of the track,those that featured masonry structures received greater impact from train-induced vibration than frame structures.Moreover,under the same operating conditions,masonry-structured buildings were found to suffer from approx.10.4 dB higher than their frame counterparts on average in frequency-division maximum vibration level.(3)Frame-structured buildings were found to transmit stronger vibration than their masonry counterparts along with the increase in story number.(4)Operation at the expansion section showed that masonry buildings take greater ambient vibration than the limit value at nighttime;its frequency-division maximum vibration level on the first-story floor slab was 5.4~12.1 dB higher than the limit value under different operating conditions.These results can provide reference for the reconstruction and expansion of existing lines.
作者
陈以庭
冯读贝
杨吉忠
金旭炜
CHEN Yiting;FENG Dubei;YANG Jizhong;JIN Xuwei(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2022年第3期12-18,共7页
High Speed Railway Technology
关键词
双层框架铁路
扩建区间
砌体建筑物
框架建筑物
环境振动
railway with two-story frame structure
expansion section
masonry building
frame building
ambient vibration
