30 March 2009 Experimental investigation on dynamic properties of concrete columns embedded with shape memory alloy
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Abstract
To investigate the influence of shape memory alloys (SMAs) on the dynamic properties (mainly refers to the frequency and the damping ratio) of concrete columns, the vibration curves of the concrete column reinforced with steel wire and SMA wires with different phase were measured through initial displacement method. In this study, the experiment included two parts. One is the free vibration test, which utilized the active property tuning (APT) principle, i.e. the passive damping, of SMAs to change the vibration performance of the concrete columns. The results show that SMAs can increase the damping ratio of the concrete column due to its high damping and decrease the frequency owing to its lower stiffness. The other is the vibration test with electrical current activation, the active strain energy tuning (ASET) principle, i.e. the active damping, was applied to alternate the vibration performance of the concrete columns. In this test, martensitic SMA wires were strained up to 4% and were heated with a current of 40A. The test results show that with increasing of the temperature, the frequency of the concrete column decreases, while its damping ratio increases. Comparing the results of these two tests, the influence of two tuning principles, APT principle and ASET principle, on the damping ratio of concrete columns is almost the same. However, for the frequency of the concrete columns, the influence of ASET principle is larger than that of APT principle.
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Di Cui, Di Cui, Hongnan Li, Hongnan Li, Gangbing Song, Gangbing Song, } "Experimental investigation on dynamic properties of concrete columns embedded with shape memory alloy", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 729248 (30 March 2009); doi: 10.1117/12.815469; https://doi.org/10.1117/12.815469
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