Impact of passanger comfort level on design of short-span composite steel i-girder high speed railroad bridges

Download
2009
Şentürk, Tolga
In globalizing world, increase in demand for high speed rail travel requires comfortable ride over bridges while maintaining an economical design. These bridges either have composite steel I-girders, prestressed precast I or box girder superstructures. The span lengths can reach up to 40 meters. If frequency of wheel load pass at a point on bridge matches with one the critical frequencies of the structure, excessive vibration can developed both at the train and the bridge even if the structure is structurally safe. Excessive vibration can discomfort the passengers. Focus of this study is given to identify certain thresholds for the rigidity of span to minimize the passenger discomfort at short-span composite steel I-girder high speed railroad bridges. In this context, various span lengths with different girder configurations have been analyzed under various train design speeds and ballast stiffness. Eigenvalue analyses are performed to determine critical frequencies of bridges. Moving force models are used to determine structural vibrations as recommended by high speed railroad bridge design specifications. It is well-known that stiffer structures can have significantly less vibration amplitudes than lighter ones providing a comfortable ride for high speed train passes.

Suggestions

Dynamic investigation and rehabilitation of existing railway truss bridge under high speed train loadings for passenger comfort
Mutlu, Gündüz; Yılmaz, Çetin; Department of Civil Engineering (2008)
In Turkey, big investments are made to improve the existing train lines for use of new high speed trains. Most of the bridges on the existing train lines are typical and in this thesis one of the standard types, the classic steel truss bridge is investigated. This thesis presents the dynamic investigation of standard type existing truss bridge for passenger comfort criteria under the high speed train loadings. Two different computational analysis models have been developed to idealize the vehicle-bridge mod...
Cost estimation of trackworks of light rail and metro projects
Öztürk, Erhan; Gündüz, Murat; Department of Civil Engineering (2009)
The main objective of this work is to develop models using multivariable regression and artificial neural network approaches for cost estimation of the construction costs of trackworks of light rail transit and metro projects at the early stages of the construction process in Turkey. These two approaches were applied to a data set of 16 projects by using seventeen parameters available at the early design phase. According to the results of each method, regression analysis estimated the cost of testing sample...
Dynamic effects of moving traffic on railway bridges
Cinek, Fatih; Yılmaz, Çetin; Department of Civil Engineering (2010)
In this study, dynamic effects on high speed railway bridges under moving traffic are investigated. Within this context, the clear definition of the possible dynamic effects is provided and the related studies that exist in literature are investigated. In the light of those studies, analytical procedures that are defined to find the critical dynamic responses such as deflections, accelerations and resonance conditions are examined and a MatLab programming language is written to obtain the responses for diff...
Seismic response of multi-span highway bridges with two-column reinforced concrete bents including foundation and column flexibility
Yılmaz, Taner; Caner, Alp; Department of Civil Engineering (2008)
Seismic design of highway bridges has improved as a result of the experience gained from large earthquakes of the last thirty years. Ductility demand and reserved capacity are extremely important response measures used in new bridge designs to assess target damage levels. However, the application of practical design approaches specified in bridge design codes is not well-defined for bridges over flexible foundations. Within the scope of this research, thirty two bridge models having varying column aspect ra...
Structural fire safety of standart circular railroad tunnels under different soil conditions
Böncü, Altan; Caner, Alp; Department of Civil Engineering (2008)
In many tunnel designs, reinforced concrete tunnel lining design is selected based on construction requirements rather than design loads. A constant cross-section is typically used along a tunnel even if the design loads change from one location to another, especially for tunnels constructed by tunnel boring machines (TBM). Factor of safety against failure is not constant along the length of tunnel and is typically high at shallow depth regions. Factor of safety during a rare event is usually much less than...
Citation Formats
T. Şentürk, “Impact of passanger comfort level on design of short-span composite steel i-girder high speed railroad bridges,” M.S. - Master of Science, Middle East Technical University, 2009.