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19 April 2013 Extension of the rotation algorithm for earthquake damage estimation of complex structures
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In a previous paper an algorithm was developed for estimating the slope at locations of ambient vibration measurements along the deformed shape of a single column subjected to strong earthquake motion. These slope estimates were used in obtaining permanent drift values for the single column and those were correlated to various levels of damage. The algorithm was illustrated with applications to single column tests performed at the University of Nevada, Reno and the University of California, Berkeley. In this paper, the same columns are first used to simulate slope values along the deformed shape of the columns in order to determine the best estimate of the displacement distribution. This information can then be used to determine the optimal number and location of sensors needed to provide a reliable permanent drift in a single column. Sensitivity studies are also performed to evaluate the effect of plastic hinge length over or underestimate as this value is usually inferred from empirical equations. The rotation algorithm is then extended to estimate residual drift from rotation measurements taken from multiple sensors in order to correlate them to structural damage. The resulting drift values can then be related to various damage states and can be used for rapid damage assessment immediately following a major earthquake. The main advantage of the proposed approach is that low-cost accelerometers can be used to obtain the information needed for rapid damage assessment.
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Konstantinos Balafas and Anne S. Kiremidjian "Extension of the rotation algorithm for earthquake damage estimation of complex structures", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 86920S (19 April 2013);

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