基于性能的集装箱起重机结构地震易损性分析

摘要

根据集装箱起重机（简称岸桥）结构在地震作用下的破坏表现特征，定义了4个破坏等级和3个性能水准，以门框位移角为量化指标，给出一种岸桥结构性能水准的确定方法。考虑结构和地震动的不确定性，对两台岸桥实例进行地震易损性分析，得到结构易损性曲线。分析结果表明：两台岸桥门框构件延性变形能力较差，在强震作用下的倒塌概率较大。易损性曲线明确了岸桥结构在不同地震动强度下的性能水准概率，为岸桥结构抗震性能评估和灾害分析提供理论依据。%According to the structure damage failure modes of container cranes,four damage states and three performance levels were defined based on the portal drift angle,and a method for solving the limit values of the three performance levels was put forward.A seismic fragility analysis on two typical cranes was carried out considering uncertainties due to the variability of ground motion and structures.The results show that the poor ductility of portal frame structure is the main reason for the high collapse probability of the cranes under strong earthquake.The probability of exceeding performance levels for the container cranes under various earthquake intensity was calculated,which provides a theoretical basis for the performance evaluation and seismic hazard analysis of container cranes.