Seismic Resilience Evaluation of Steel-Concrete Composite Girder Bridge in Cold Regions with High Seismic Intensity
Considering the whole process of the disaster of the bridge system,a scheme for evaluating the seismic resilience of steel-concrete composite girder bridges in cold regions with high seismic intensity is proposed.Based on the existing statistical data,the pre-earthquake functional loss function of steel-concrete composite girder bridges in cold regions with high seismic intensity was constructed by considering pile settlement damage,fatigue damage and freeze-thaw damage.The post-earthquake recovery function of bridge system was constructed by combining the seismic fragility analysis with the seismic resilience evaluation.The critical maintenance and reinforcement life before the earthquake and the temporary maintenance status were proposed.The results show that the critical maintenance and reinforcement life of steel-concrete composite girder bridge system in high seismic intensity frozen soil area decreases with the increase of peak groud acceleration(PGA).When the PGA is 0.10g,0.15g,0.20g and 0.30g,the critical maintenance and reinforcement life of the bridge system are expected to be 27,24,19 and 8 years,respectively.When the bridge is located in the Ⅸ degree fortified area and above,the damping and isolation device must be considered in the design of bridge scheme.The recovery time of bridge system increases with the increase of PGA,and the resilience index decreases with the increase of PGA.When an earthquake occurs after 20 years of bridge operation,ground motion of 0.10g and 0.15g is not expected to affect the passage of the bridge,while with ground motion of 0.20g～0.40g,the bridge needs to be repaired and reinforced to achieve temporary maintenance status,the estimated recovery time is 1～42 days and the resilience index is 0.647～0.578.The maximum value of resilience indexes restored to the temporary maintenance status is 0.650.
cold regions with high seismic intensitypile settlementbridge seismic resistancefreeze-thaw damageseismic resilience
万方数据
维普
