چكيده به لاتين
Fasteners play a special role in reducing the vibrations created in the railway track, track stability and safety of movement, and any damage to the links such as pad stiffness, spring failure, spring cracking, and rail pad deterioration. Disconnections have been made, resulting in consequences such as track failure, rail failure, increased noise and vibration, and reduced track safety index. The direct iMPact of damage and failure of the fasteners is on the stiffness and damping of these elements, and over time, at different levels of operation and maintenance of the track, the fasteners behave individually. In this concern, to investigate the operating conditions and failures in the fasteners, the iMPact of the deterioration of the fasteners has been considered. First, the three-dimensional and three-layer numerical model of the track has been developed in finite element software and the validation has been performed using the results of field tests in the sixth line of Tehran Metro. For applying probabilistic analysis to the operating conditions of the stiffness and damping parameters, the Monte Carlo method was used. Then, based on the permutation curves, the failure characteristics of the fasteners are presented for three different levels of maintenance. The results also show that not considering the conditions and levels of maintenance, can lead to the dismissal of connections from the designed quality and inappropriate performance of the connection systems.
