Comparative Analysis of Two Different Light Rail Superstructures in Istanbul Traffic in Terms of Vibration

Year 2020, , 589 - 607, 31.01.2020

Muzaffer Metin , Arif Ulu

https://doi.org/10.29130/dubited.577659

Abstract

Railway-induced vibrations are one of the major problems that need to be
suppressed for the passengers or people who are living around the railway. It
is essential that the vibrations are first tried to be suppressed on the
source, railway. Thus, the railway superstructure components contain various
elastic elements used in vibration insulation, such as rail pads. In this
study, two different railway superstructures used in Istanbul railway traffic
were tested while passing the railway vehicle at various speeds, and the
vibrations generated by the wheel-rail interaction were compared regarding
passenger comfort and the environment in compliance with the relevant
standards. Used railway superstructures to compare the propagated vibrations
are constructions with single and double elastomeric layers installed on the
same line, sequentially. In this experimental benchmarking study which contains
some evaluations according to standards, the behaviour of these two railway
superstructure types in terms of vibration insulation in light metro lines is
revealed using measurement results. Consequently, when the double-layered
elastomer is used instead of a single-layered in the superstructure, the
comfort level of the people living around the line is improved as up to 64% and
the comfort level of the passengers is improved as up to 54%. In addition, in
terms of the safety investigations of the buildings around the line, a
meaningful decrease in vibrations greater than 70 Hz is observed and it is
concluded that residential buildings could be built up to 5 m distance.

Keywords

Railway, Superstructure, Rail pad, Vibration analysis, Vibration Insulation

Supporting Institution

TÜBİTAK

Project Number

115M586

Thanks

The financial support of the Program for Scientific and Technological Research Projects 1001 by the Scientific and Technical Research Council of Turkey (TUBITAK) [Project No: 115M586] is gratefully acknowledged.

İstanbul Trafiğinde Bulunan İki Farklı Hafif Metro Üstyapısının Titreşim Bakımından Karşılaştırmalı Analizi

Abstract

Demiryoluna bağlı titreşimler, yolcuların veya demiryolunun
çevresinde yaşayan insanlar için bastırılması gereken en önemli sorunlardan
biridir. Titreşimlerin öncelikle kaynakta, yani demiryolu üzerinde bastırılmaya
çalışılması esastır. Bu nedenle, demiryolu üst yapı bileşenleri, titreşim
yalıtımında kullanılan ray pedleri gibi çeşitli elastik elemanlar içerir. Bu
çalışmada, İstanbul demiryolu trafiğinde kullanılan iki farklı demiryolu üst
yapısı, demiryolu aracı çeşitli hızlarda geçerken test edildi ve tekerlek-ray etkileşiminin
oluşturduğu titreşimler, yolcu konforu ve çevre ile ilgili standartlara uygun
olarak karşılaştırıldı. Yayılan titreşimleri karşılaştırmak için aynı hat
üzerinde yerleştirilmiş tek ve çift elastomerik tabakalara sahip demiryolu
üstyapıları kullanılmıştır. Standartlara göre bazı değerlendirmeler içeren bu
deneysel kıyaslama çalışmasında, bu iki demiryolu üst yapı tipinin hafif metro
hatlarında titreşim yalıtımı açısından davranışları ölçüm sonuçları
kullanılarak ortaya konmuştur. Sonuç olarak, üstyapıda tek katman yerine çift
katmanlı elastomer kullanıldığında, hat çevresinde yaşayan insanların konfor
seviyelerinde %64’e, araç içerisinde bulunan yolcuların konfor seviyelerinde
ise %54 varan iyileşme gerçekleşmiştir. Ayrıca, hat çevresinde bulunan
binaların güvenliği bakımından yapılan araştırmada 70 HZ’den büyük
titreşimlerde anlamlı bir azalma gözlenmiş ve hatta en az 5 m mesafeye kadar
konut amaçlı bina yapılabileceği sonucuna ulaşılmıştır.

Keywords

Demiryolu, Üstyapı, Ray pedi, Titreşim analizi, Titreşim izolasyonu

Project Number

115M586

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