Research on Vulnerability of Long-span Continuous Rigid-frame High Speed Railway Bridge Under Near-fault Earthquake
The paper presents a risk classification method for the seismic damage of bridge,based on the damage curve(s)of whole bridge obtained from the assumption of logarithmic Gaussian distribution of engineering requirements(EDP).The goal is to study the seismic performance of long-span continuous rigid-frame HSR bridge under near-fault earthquake.Given the stiffness of ballastless track on the bridge,the paper builds an integrated nonlinear finite element model of track-bridge for a long-span continuous rigid-frame HSR bridge on OpenSees platform.As 80 near-fault ground motion waves recorded constitute the ground motion database,the seismic performance of the bridge is analyzed via probability-demand-based vulnerability analysis.The results show a strong correlation between the near-fault peak ground velocity(PGV)and the EDP.Under near-fault earthquake,the side bearings of the bridge are prone to slight damage,while in case of medium-high intensity(PGV greater than 100 cm/s)near-fault ground motion,the yield probability of key sections of the bridge can be fairly significant.When PGV is 200 cm/s,the bridge structure is subject to serious damage,while it is very likely to be completely damaged or even collapsed at 300 cm/s.The results are of reference to the seismic design of continuous rigid-frame HSR bridges in near-fault areas.
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