Based on the vehicle-track coupled dynamic theory,considering nonlinear contacts among components of a longitudinal connected slab ballastless track-bridge system,a 3-D nonlinear finite element coupled dynamic model for a high speed train-longitudinal connected slab ballastless track-bridge system was established. With the established model,when a high speed train passing the uneven settlement region of pier and abutment of longitudinal connected ballastless slab track on bridge,effects of uneven settlement of pier and abutment on dynamic characteristics of the high speed train-longitudinal connected slab ballastless track-bridge system were studied. The results showed that ① uneven settlement of pier and abutment greatly affects vibration characteristics of components of high speed train and longitudinal connected slab ballastless track,but it has little influence on bridge vibration; ② uneven settlement of pier and abutment has relatively small influence on maximum vertical wheel-rail force and maximum pressure force on fasteners,however,it has large influence on maximum positive moment of rail,maximum tensile force of fastener,maximum longitudinal tensile stress of slab and base plate,and maximum pressure stress of CA mortar; ③ effects of uneven settlement of pier and abutment on dynamic characteristics of the coupled system and dynamic stress features of ballastless track are not a simple linear monotonic increase,but related to local void among components of ballastless track and that between ballastless track and bridge caused by uneven settlement of pier and abutment.
Key words
longitudinal connected slab track /
high speed railway /
bridge /
coupling dynamics /
differential settlement of piers and abutments
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