|Advisor||Hussein, Mohammed F
|Author||Alabbasi, Sateh Abdulnaser
|Abstract||This thesis presents a research study on the dynamic behavior of a special type
of FST used in recently built subway system in Doha, Qatar. The special FST has a
continuous concrete slab with periodic grooves for which the track can be modeled as
periodic structure with a slab unit having two elements with different cross sections.
Extensive numerical and experimental investigations were conducted on a multi-unit
full-scale mockup track. The numerical investigations were carried out using both a fast
running model based on the Dynamic Stiffness Method and a detailed Finite Element
model. In the experimental campaign, experimental vibration test was performed to
identify the actual vibration response of the mockup track. Results from the
experimental investigations were then used for verifying the numerical models and
carrying out a model updating exercise for the fast running model. The model updating
process was carried out according to an automated hybrid optimization approach.
Finally, the updated model was extended to an infinite model and used in a parametric
study to investigate the influence of varying groove’s thickness on the dynamic
behavior of the special track with infinite length for both bending and torsion scenarios.
The parametric study suggested that reducing the thickness below 50% of the full
thickness of the slab significantly affects the dynamic behavior of the special FST.
|Subject||Beam Theories - Track Model
|Subject||Railway Tracks Models
|Title||A Numerical and Experimental Investigation of a Special Type of Floating-Slab Tracks