Seismic damage analysis of bridge-CRTS Ⅲ slab ballastless track system on high-speed railway

Abstract

With the wide application of the Chinese Railway Track System Ⅲ (CRTS Ⅲ) slab ballastless track structure in highspeed railway lines, the seismic safety of CRTS Ⅲ slab ballastless track structure is important in regions of high seismicity. However, little is known about the seismic behaviors of CRTS Ⅲ ballastless track system. To address the issue, this paper investigates the seismic damage of a simply supported bridge- CRTS Ⅲ slab ballastless track system. The result shows that CRTS Ⅲ ballastless track can provide the bridge structure with longitudinal restraint but is inferior to the CRTS II ballastless track system. Fasteners are found seismically vulnerable for CRTS III ballastless track structure. The inconsistent vibration of unequal height piers is the main cause to the damage of the track structures. Based on the seismic damage analysis, a simplified seismic model of CRTS Ⅲ ballastless track structure is proposed for computational attractiveness.