Analysis of Influence of PSI on Response of Bridge-Track System under Near-Field Pulse Earthquake
To study the influence of pile-soil interaction(PSI)on the near-field pulse seismic response of high-speed railway bridge-ballastless track system,the finite element model of the bridge-track system was established by ANSYS.The influence of PSI on the seismic response of the system was analyzed from three aspects:the natural vibration characteristics of the system,the post-earthquake residual displacement of each layer of the system and the key components between layers and the envelope displacement during the earthquake.The results showed:the natural vibration period of high-speed railway bridge-ballastless track system is extended considering PSI;the post-earthquake residual deformation and the seismic peak envelope deformation of each layer of main beam,base slab,track slab and rail are different considering or not considering PSI,and the post-earthquake residual deformation and the seismic peak envelope deformation of each layer of the track structure on simply supported beam and continuous beam bridge change alternately along the mileage direction;the influence of PSI on the key components such as fasteners,mortar layer,sliding layer and lateral blocks is obvious,especially for the key components with small stiffness.The influence of PSI on the key components between layers of the bridge-ballastless track system should be focused on in the anti-seismic checking calculation.
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