Abstract
This paper uses the long-span steel truss slab track as its research subject to analyze the new type of sleeper slab track structure with an experimental method. Firstly, a full-scale model was established in the laboratory to form a “rail–sleeper slab–self-compacting concrete cushion–steel beam” composite structure, and a fatigue test was performed on the track structure. The cyclic load was set up as a sine form with a range between 75 and 375 kN at a 5 Hz interval and 3 × 106 cycles. Based on the test, the performance of the track structure under cyclic train load was studied. Secondly, after every 106 loading cycles, the vertical static loading test and horizontal resistance test of the track structure were carried out to obtain the strain and displacement under different loading cycles. Finally, after 3 × 106 cycles of sine cyclic loading, the horizontal ultimate resistance test of the track structure was carried out to study its horizontal failure mode. The aims of this paper were to verify the applicability of the sleeper slab track, identify the mechanical properties, and determine the unfavorable position. The findings can provide an important reference for the practical use of the sleeper slab track structure.
Highlights
With the development of railway construction in China, the proportion of bridges in railway lines has gradually increased
When a vehicle passes through the bridge, the wheel–rail force is transmitted to the bridge through the track structure, which causes strain and deformation of the bridge, affecting the safety and comfort of the track structure on the bridge
The results show that the bridge has a great influence on the dynamic response of track structure [1]
Summary
With the development of railway construction in China, the proportion of bridges in railway lines has gradually increased. The ballasted track, slab ballastless track, and wooden sleeper (composite sleeper) track on the open deck are the main track forms used on bridges. Wooden sleepers are the main track structure used on the open deck of steel truss bridges. In order to prolong the maintenance period of the track structure and reduce the secondary dead load of the bridge, a new type of concrete sleeper slab track structure on the open deck was adopted. 1.6m) m)in inorder order to to simulate simulate the the vertical vertical deformation support deformation of of the the steel steeltruss truss bridge and the support form of the track structure in practical engineering. The dimensions of the self-compacting concrete cushion are 1150 mm (length) × 580 mm (width) × 120 mm (height), and each sleeper slab track structure has two symmetrical cushions. The 60 kg/m rail is used in this structure, and the density is 7850 kg/m3
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