摘要
建立了车辆-轨道-隧道及大地-房建结构空间耦合动力学模型,通过子模型间的相互作用关系实现了车辆、轨道、下部基础及房建结构的空间耦合振动分析,并通过相关现场调研和测试验证了模型的可靠性,分析了隧道埋深、建筑高度、楼板厚度、车辆运行速度等参数对建筑物振动特性和振动衰减的影响规律.研究发现,当隧道埋深在11.6m至21.6m间变化时,地表距离隧道中心线10~60m的范围存在振动放大区;隧道埋深从11.6m增大至21.6m,各楼层振级下降幅度为8.3~13.4dB,建筑物振动模态从以高阶振型为主转变成以低阶振型为主;地铁线附近建筑物层数越低,结构的振动响应越小;楼板厚度由0.15m增加至0.25m,各楼层振级下降幅度为0.9~7.4dB;车辆速度由80km/h降低至40km/h,各楼层振级下降幅度为5.7~6.9dB.可见,当地铁线路先于建筑物存在时,适当增加建筑物楼板厚度、降低行车速度、避开振动放大区是控制建筑物结构振动的有效方案.
The spatial coupled dynamic model of vehicle-track-tunnel and ground-building structure is established,and the spatial coupled vibration analysis of vehicle,track,foundation and building structure is realized by setting up the interaction relationship between the sub-models.The reliability of the model is verified by related field research and test.The effect of tunnel burial depth,building height,floor thickness,train speed and other parameters on the vibration characteristics and the law of vibration attenuation of buildings are analyzed.The results show that there is a vibration amplifying area in the range of 10~60mfrom the centerline of the tunnel when the burial depth of the tunnel varies from 11.6mto 21.6m.The vibration decrease ampli-tudes of the floors range from 8.3dB to 13.4dB when the burial depth of tunnel increases from11.6mto 21.6 m,and the vibration modes of buildings change from high-order modes to loworder modes.The vibration level of buildings near the subway line decreases with the decrease of buildings＇ height.The range of vibration level amplitude of each floor is from 0.9dB to 7.4dB when the thickness of floors increases from 0.15 mto 0.25 m.The decline in vibration level amplitude is from 5.7dB to 6.9dB when the speed of the subway decreases from 80km/h to 40km/h.Thus,when the subway line is prior to the existence of buildings,the thickness of building floors should be increased properly,the speed of vehicle should be decreased and the vibration amplification area should be shied away so as to effectively control structural vibration of buildings.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2017年第4期23-30,39,共9页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
中国铁路总公司科技研究开发计划重点课题(2016G009-A
2015YJ121)
中央高校基本科研业务费专项资金(2016JBM037)~~
关键词
轨道交通
建筑物振动特性
数值模拟
振动放大区
rail transit
vibration characteristics of building
numerical simulation
vibration amplification area
