A railway steel truss arch bridge with 400 m span in China was selected as engineering background.The method of low-frequency velocity pulse superimposed high-frequency original records was used to compound near-fault pulse ground motions.The dynamic time-history analysis was carried out and the response characteristics of the bridge and the transverse, longitudinal reduction technology were studied.Results show that, compared with earthquakes without pulse, the response of components increased obviously under near-fault pulse earthquakes.The sections of junction piers’ bottom, crossbeam, and approach piers’ bottom were damaged seriously.The bearings were also damaged seriously.Moreover, the beam and abutment were collided at some probability.The stress of the arch can be reduced by arranging the friction pendulum bearings in the whole bridge; however, the moment of piers cannot be controlled effectively, and the displacement of the beam end will be released.With the longitudinal seismic reduction scheme of “friction pendulum bearing + viscous damper”, the stress of the arch, the bending moment at the junction piers’ bottom and the displacement of the beam end can be decreased by 28.53%, 63.23%, and 22.52%, respectively.The seismic response of the crossbeam can be reduced greatly by adding buckling restrained brace in the transverse direction of the bridge.The bending moment of the junction piers’ lower and middle crossbeams can be decreased by 58.89% and 62.48%, respectively.The seismic performance of the bridge can be improved with the combined seismic reduction measures, and the requirements of seismic fortification can be met, which can be used as a reference for the seismic reduction design of the same type bridges.
Key words
long-span railway steel truss arch bridge /
near-fault pulse ground motion /
seismic response characteristic /
seismic reduction technology /
friction pendulum bearing /
viscous damper /
buckling restrained brace
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