Ride comfort is taken as the priority target in the design of high-speed railway bridges in China to be reflected in the stiffness-based design, and cause indeterminacy of bridges’ aseismic performance and seismic failure features. Here, a 5-span 32 m simply supported girder bridge model was built, and it was composed of piers, supports, girders, track structures, rails, etc. considering interaction between piles and soil of pier group foundation under bridge and effects of vertical force on friction of slide supports. Based on this model, seismic responses of a multi-span simply supported girder bridge under near-field earthquake were studied. Combined with the failure limit of each component, seismic failure features of the structure under earthquake are analyzed. Results showed that failure positions of a high-speed railway bridge under near-fault earthquake are concentrated at beam joint and sliding layer, while pier failure is not serious; in design and assessment of high-speed railway bridges, aseismic performance and failure features of functional components, such as, upper track structure should receive much attention, and destruction of track structure may cause the bridge’s function to be interrupted and huge economic loss.
Key words
high-speed railway /
simply supported beam bridge /
near-fault earthquake /
pier /
track structure /
failure feature
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