Study On The Longitudinal Forces Of B(?)GL Ballastless Track Slab On Simply-Supported Bridges

Based on the Beijing-Tianjin inter-city rail transit project, this paper established a bog ballastless track slab on bridges finite element model to analysis of the longitudinal forces. Taking into account the complexity and the amount of calculation of model, in this paper model of the rail, track plates, the base plate and the bridge to simplify the beam elements to simulate . Meanwhile CA mortar layer to the role of the model that can ensure a coordinated deformation between plate and the base plate, so it that is equivalent to one beam layer to simulate . Fastener longitudinal resistance and friction between the base plate and bridge are simulated by nonlinear spring element, and the pier stiffness is simulated by linear spring element.This paper analysis of the longitudinal static force to Multi-span simply-supported bridge, including braking force, stretching force, and the rupture force of rails. In the above analysis, the aspect of different friction coefficient between bridge and base plate, plate stiffness and the length of friction plates are in all considered. Condition of the rupture force of rails, it studies the influences of rail-gap in track temperature changes and beam temperature variations respectively variations. This paper also compares and analysis the structure force of 24m and 32m span of simply-supported bridges,also the author studies the influences of different layout of fastener.The results show that the track plate under a larger force in temperature load can be used as a predominant factor in its design, low friction coefficient between the base plate and bridges and more comprehensive slab extendable stiffness are in good condition to the structure, Also low friction coefficient between the base plate and bridges also can effectively reduce the structure force influenced by the bridge span changes.