Author: Cheng, Ka Man
Title: Field measurements and analysis of surface rail induced vertical ground vibrations
Degree: M.Sc.
Year: 2017
Subject: Hong Kong Polytechnic University -- Dissertations
Railroad trains -- Vibration
Buildings -- Vibration
Vibration -- Measurement
Department: Faculty of Construction and Environment
Pages: ix, 65 pages : color illustrations
Language: English
Abstract: In Hong Kong, buildings are built close to the rail or even on top on the rail station. However, vibrations from moving trains may cause damage to the adjacent structures, unwanted vibration and noise to the public. The study of vibration induced by surface train is important to identify the amplitudes and dominant frequencies of the vibration. Accurate prediction can help the rolling stock, rail and building designers to minimize the vibration and improve the building vibration mitigation systems. Analytical model studied in this paper can help designer to predict the vibration easily without building up a complex numerical model. To study the characteristics of surface train induced vertical ground vibration field measurements were carried out in Pak Shek Kwok, Hong Kong. It is affected by factors including: (a) train type, (b) distance of observation from the rail and (c) location of observation. The analytical model proposed by Weitsman (1970) and Krylov & Ferguson (1994) were reviewed in this paper. Using the same parameters given in Krylov & Ferguson (1994), different results were obtained. FFT output frequency, number of sleepers considered, inaccurate approximated equation to calculate the non-contact distance, undefined vibration spectra unit, and uncertainties in soil parameters contribute to the inaccuracies of the prediction of ground vibration of Krylov & Ferguson (1994) models. This paper identified the factors that contribute to the prediction and not mentioned in Krylov & Ferguson study. Directions of future study is proposed such as to review and standardize the output frequency of FFT , limit the number of sleepers considered, and create a more accurate estimated equation to calculate contactless distance.
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