Techno Press

Steel and Composite Structures   Volume 25, Number 4, November20 2017, pages 427-442
Damped frequencies of precast modular steel-concrete composite railway track slabs
Sakdirat Kaewunruen and Stephen Kimindiri Kimani

Abstract     [Full Text]
    This paper presents unprecedented damped oscillation behaviours of a precast steel-concrete composite slab panel for track support. The steel-concrete composite slab track is an innovative slab track, a form of ballastless track which is becoming increasingly attractive to asset owners as they seek to reduce lifecycle costs and deal with increasing rail traffic speeds. The slender nature of the slab panel due to its reduced depth of construction makes it susceptible to vibration problems. The aim of the study is driven by the need to address the limited research available to date on the dynamic behaviour of steel-concrete composite slab panels for track support. Free vibration analysis of the track slab has been carried out using ABAQUS. Both undamped and damped eigenfrequencies and eigenmodes have been extracted using the Lancsoz method. The fundamental natural frequencies of the slab panel have been identified together with corresponding mode shapes. To investigate the sensitivity of the natural frequencies and mode shapes, parametric studies have been established, considering concrete strength and mass and steel\'s modulus of elasticity. This study is the world first to observe crossover phenomena that result in the inversion of the natural orders without interaction. It also reveals that replacement of the steel with aluminium or carbon fibre sheeting can only marginally reduce the natural frequencies of the slab panel.
Key Words
    free vibration; steel-concrete composite; ballastless track; slab panel track; natural frequency; natural mode; mass; stiffness; crossover; veering
Sakdirat Kaewunruen: Birmingham Centre for Railway Research and Education, School of Engineering, University of Birmingham, Birmingham B15 2TT UK
Stephen Kimindiri Kimani: Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham B15 2TT UK

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