基于监测数据的斜拉桥地震事件安全评估

Safety Assessment of Seismic Event of Cable-stayed Bridge Based on Monitoring Data

震荷载是大跨径斜拉桥的重要控制因素,在地震事件后需要快速评估,以确定损伤情况并给出需检查的薄弱环节。介绍了一种基于监测数据的斜拉桥地震事件安全评估策略。首先,对比监测到的和设计采用的地震加速度谱,初步确定地震的严重程度;然后,根据已建立的基准有限元模型,以监测地震荷载为输入进行时程有限元分析;最后通过比较理论和实际监测的结构响应,确认结构的震后性能。

Seismic load is an important control factor of long-span cable-stayed bridges,and is required to evaluate quickly after a seismic event so as to determine the damage conditions and give the weak links to be inspected.This paper introduces a safety assessment strategy of cable-stayed bridge in a seismic event based on the monitoring data.First of all,the monitored and designed seismic acceleration spectrums are compared in order to preliminarily determine the severity of the seismic event,then the time-history finite element analysis is carried out with the monitored seismic load as the input based on the built reference finite element model,and finally the post-earthquake performance of structure is verified by comparing the theoretical and practically monitored structural responses.