|Table of Contents|

Vibration characteristics of metro depot upper building under double vibration source excitation(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2019年04期
Page:
59-69
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Vibration characteristics of metro depot upper building under double vibration source excitation
Author(s):
FENG Qing-song1;  WANG Zi-yu1;  LIU Quan-min1;  LUO Xin-wei2;  LI Ji-yang1
(1. Engineering Research Center of Railway Environmental Vibration and Noise of Ministry of Education, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 2. Guangzhou Metro Design and Research Institute Co., Ltd., Guangzhou 510010, Guangdong, China)
Keywords:
railway engineering;  metro depot;  upper building;  double vibration source excitation;  FEM model;  vibration characteristic
PACS:
U231
DOI:
-
Abstract:
Taking a certain metro depot in Guangzhou as the research object, the accelerations of ground vibration caused by the testing line and the repairing line in the depot were measured, and the attenuation laws and differences between the two kinds of vibration sources were analyzed. The finite element model of metro depot upper building was established, and the measured ground vibration data were processed by multi-support excitation of large mass method. The influence of double vibration source excitation on the vibration of upper building floor was analyzed. Analysis result shows that when the train passes through, the main frequency range of ground vibration of testing line is 60-80 Hz, and that of repairing line is 20-40 Hz. The vibration source strength of testing line is greater than that of repairing line, which is about 6 dB. The vibration attenuation rates of testing line and repairing line are about 1.07 and 1.69 dB·m-1 respectively, which indicates that the attenuation speed of ground vibration strength caused by the repairing line is faster than the testing line. Compared with the non-uniform excitation, the uniform excitation has a significant effect on the vibration of below 10 Hz for the upper building floor. The acceleration level of each layer has obvious peak at 2.5 Hz, which related to the inherent frequency of building floor. Under the load excitation of testing line, the main vibration frequency ranges of low and top floors are 40-60 and 20-40 Hz, respectively, and the central frequency of peak is concentrated at 40.0 Hz. Under the load excitation of repairing line, the main vibration frequency range of each floor is 0-40 Hz, and the central frequency of peak is concentrated at 31.5 Hz. Compared with the single source excitation, the double vibration source excitation increases the degree of Z direction vibration level of building floor by 0-3.5 dB, which should be paid full attention in the environmental vibration evaluation for the upper building of metro depot. 2 tabs, 15 figs, 31 refs.

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Last Update: 2019-09-03