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根据以往地震后桥梁震害调查情况及连续刚构桥的施工特点,给出了施工期间不同等级地震作用下可能发生的风险事件。依据桥梁的抗震设防要求、施工特点以及结构性能,推断出地震发生的概率及其等级。针对施工期间地震发生时可能造成的损失,从经济损失、人员伤亡、工期延误、环境影响四个方面进行了考虑。然后根据风险发生概率及其对应的损失确定风险级别,并做出相应的决策。最后,应用所建立的分析方法对北山连续刚构桥进行了施工期间地震风险的分析和评价。
According to the investigation of bridge damage and the construction characteristics of continuous rigid frame bridge after previous earthquakes, the risk events that may occur under different levels of earthquakes during construction are given. According to the bridge seismic requirements, construction characteristics and structural performance, infer the probability of occurrence of the earthquake and its grade. In view of the possible losses caused by the earthquake during the construction period, it has been considered in four aspects: economic loss, casualties, construction period delay and environmental impact. Then according to the probability of occurrence of the risk and its corresponding loss to determine the level of risk, and make the appropriate decision. Finally, the seismic risk analysis and evaluation of Beishan continuous rigid frame bridge was carried out with the analysis method established.