A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Stiffness Ratio of a Direct Fixation Fastener
The dynamic amplification of stiffness or stiffness ratio is used as a qualification and production test for the procurement of direct fixation fastener (DFF) to ensure vibration isolation and reduce impact load to the concrete invert. According to AREMA design criteria, stiffness ratio should not be greater than 1.5. As per TCRP, the limit is 1.3. There should be a basis to set the upper limit of stiffness ratio. In this paper, an analysis on dynamic amplification of stiffness of a ballasted track is done to formulate stiffness ratio which is used to determine the stiffness ratio of a DFF, because a DFF track is simulated to have the resiliency of a ballasted track. It is demonstrated that the stiffness ratio is not linearly related with the damping, and a damping ratio over 0.5 is preferable for a track. Finally, stiffness ratio of a DFF is suggested.
Stiffness Ratio of a Direct Fixation Fastener
The dynamic amplification of stiffness or stiffness ratio is used as a qualification and production test for the procurement of direct fixation fastener (DFF) to ensure vibration isolation and reduce impact load to the concrete invert. According to AREMA design criteria, stiffness ratio should not be greater than 1.5. As per TCRP, the limit is 1.3. There should be a basis to set the upper limit of stiffness ratio. In this paper, an analysis on dynamic amplification of stiffness of a ballasted track is done to formulate stiffness ratio which is used to determine the stiffness ratio of a DFF, because a DFF track is simulated to have the resiliency of a ballasted track. It is demonstrated that the stiffness ratio is not linearly related with the damping, and a damping ratio over 0.5 is preferable for a track. Finally, stiffness ratio of a DFF is suggested.
Stiffness Ratio of a Direct Fixation Fastener
Hasan, Nazmul (author)
International Conference on Transportation and Development 2016 ; 2016 ; Houston, Texas
2016-06-20
Conference paper
Electronic Resource
English
Direct Fixation Track Fastener System Replacement
| British Library Conference Proceedings | 1997