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| Research on the Influence of Bridge Slope on Uplift Force of the Fasteners at Continuous Beam Ends |
| TIAN Chun - xiang |
| (China Railway Eryuan Engineering Group Co. Ltd，Chengdu, Sichuan 610031, China) |
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Abstract Research purposes ： If ballastless track was laid on long - span bridges, the gradient，span and temperature change of bridge will have impact on force of fasteners at beam end. A finite element model which could calculate the force of fasteners on sloping bridges was established. The influences of bridge gradient， temperature variation， temperature span and the layout of fixed bearing of the adjacent simply supported beam bridge on fastener force were analyzed with the model. The maximum gradients of continuous beam bridges with different height piers and temperature spans were determined based on the fastener force under the disadvantageous load effect combination which might occur during the operation. The value could provide theoretical guidance for the design of ballastless track on long - span bridges in mountainous area.
Research conclusions:( 1 ) The influence of the gradient of bridge on the direction of fasteners force should be considered when calculating the fastener force affected by the deformation of sloping bridge. (2) With the increasing of gradient, the temperature variation and the temperature span, the maximum additional force of fasteners increases linearly. The configuration with the fixed bearing of simply supported bridge adjacent to the continuous beam bridge laying on the direction of foil is beneficial to the fastener. ( 3 ) In order to make sure that the fastener force does not exceed the limit value under disadvantageous load effect combination, the maximum gradients of continuous beam bridges with different height piers and temperature spans are acquired, and the laying transition slab between the ends of
two beams can increase the maximum gradients. (4) The results can be used to guide the design of bridge and ballastless track.
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Received: 14 July 2015
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2015, Vol. 32 
