Modeling of ground-borne vibration from underground railway systems

Download
2012
Albayrak, Ahmet
Ground-borne vibrations from railway systems not only pose threats to structural integrity of nearby buildings and cause annoyance on people but also contribute into environmental noise levels. It is of utmost importance to predict these vibrations at the design stage of such systems. This thesis attempts to reach this goal through finite elements analysis. Commercial software is used to develop a finite element model of an existing railway system. The model is based on the work of Forrest and Hunt [11]. It is also aimed to perform transient analysis in time domain to complement vibration information already obtained in frequency domain. The model is validated by checking maximum element size and comparing results with the infinite boundary condition case. Parametric studies are designed to investigate effects of soil type, railpad type and train speed on vibrations induced by underground train traffic. Results acquired through the finite element analysis are found to be in good harmony with the ones by existing numerical methods. The study demonstrates that the approach can be applied to predict ground-borne vibration from any configuration of railway systems.

Suggestions

Prediction of ground borne vibrations due to railway traffic
Alan, Salih; Çalışkan, Mehmet; Department of Mechanical Engineering (2016)
The aim of this thesis is to analyze the ground borne vibrations originating from railway traffic. A numerical prediction model is developed and elements of the railway structure are analyzed for ground vibrations due to railway traffic. The proposed prediction model is a time domain three-dimensional model. Modal parameters of track-and-ground-coupled structure and railway vehicle are obtained by modal analyses. Impulse response functions are calculated from modal parameters. The vibration responses are pr...
Numerical prediction and experimental investigation of fretting fatigue crack initiation at railway axle - wheel contacts
Gürer, Göksu; Gür, Cemil Hakan; Department of Metallurgical and Materials Engineering (2017)
The aim of this thesis is to develop a procedure based on the multi-axial fatigue theories that can be used at the design stage for minimizing fretting fatigue failures of the railway axles. The premature fretting fatigue failure of the press-fitted wheel-axle assembly was investigated by means of mechanical and metallurgical methods. First, the loading path obtained through finite element analysis was implemented into the stress-based multiaxial fatigue models to predict possible sites of crack initiation....
Modeling of ground-borne vibration from underground railway systems
Sarıgöl, Melih; Çalışkan, Mehmet; Department of Mechanical Engineering (2007)
Ground-borne vibration from underground rail vehicles is studied analytically. A previously developed model by J.A.Forrest and H.E.M.Hunt is modified to account for different track and vehicle models. The tunnel is modeled as infinite cylindrical shell surrounded by viscoelastic soil. The track is coupled to the tunnel with supports of complex stiffness. The rails, which are modeled as infinite Euler beams, are supported by discrete sleepers with regular spacing, and railpads with complex stiffness. A modif...
Numerical simulations of reinforced concrete frames tested using pseudo-dynamic method
Mutlu, Mehmet Başar; Binici, Barış; Department of Civil Engineering (2012)
Considering the deficiencies frequently observed in the existing reinforced concrete buildings, detailed assessment and rehabilitation must be conducted to avoid significant life and value loss in seismic zones. In this sense, performance based evaluation methods suggested in the regulations and codes must be examined and revised through experimental and analytical research to provide safe and economical rehabilitation solutions. In this study, seismic behavior of three reinforced concrete frames built and ...
Metaheuristic based backcalculation of rock mass parameters around tunnels
Gedik, Görkem; Pekcan, Onur; Department of Civil Engineering (2018)
Due to uncertainities in the ground conditions and the complexity of soil-structure interactions, the determination of accurate ground parameters, which are not only used in tunnel construction but in the design of all underground structures, have a great significance in having structures that are cost-efficient. Backcalculation methods which rely not only on laborotory and field tests but also on field monitoring and field data provide real structure conditions and therefore it is gaining popularity in geo...
Citation Formats
A. Albayrak, “Modeling of ground-borne vibration from underground railway systems,” M.S. - Master of Science, Middle East Technical University, 2012.