Development of Fragility Relationships for Smart Structures

摘要

To mitigate the dynamic effects of earthquakes in structures,several classes of response modification strategies have been developed,including passive,active,and semiactive devices.Structures with supplemental control systems have been shown to reduce the responses during large earthquake events.Although recent studies on controlled structures have mainly focused on modeling,performance and control strategies,a systematic study on the vulnerability of controlled structures has not been conducted.Seismic risk assessments are becoming more valuable to mitigate future losses.A fragility analysis considers the conditional probability of a system meeting or exceeding a specified performance limit state given the occurrence of a particular demand.Fragility analyses are less complex,less costly,and more easily understood by decision makers than complete risk assessments; however provide information that is primarily useful in an averaged sense.Fragility relationships may be used on systems of structures to determine the risk and identify the pros and cons of potential retrofit strategies.This paper explores fragility functions of actively controlled configurations to more easily depict the reduction of probability of failure compared to a structure without control devices.