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Volume Title: ICASGE2023

DOI: ICASGE-STA

¹Sourabh Rajoriya ; ¹Shambhu Sharan Mishra; ²Gautam Kumar; Shambhu Sharan Mishra

¹Department of Civil Engineering, National Institute of Technology Patna, India

²Department of Civil Engineering, National Institute of Technology, Patna, India

This paper presents the assessment of the diminishing amplitudes of the cable vibration. Shape memory alloy (SMA) wires, because of their superelasticity or shape memory properties, can promise to be one of the damping materials in suppressing stay cable oscillations. The influence of three different SMA (i.e. Ni-Ti, Cu-Zn, and Cu-Al-Ni) wires on model cable vibration was studied. To impart free and forced vibration respectively in the cable, a transducer-based hammer and exciter were used. An accelerometer and data acquisition system was used to record and acquire the vibration data. In the present work, at a location of 0.3 times the length of the cable, excitation was induced and amplitudes were measured at the varying locations of the cable. Maximum amplitude in the cable was observed at the mid-length. The vibration amplitudes were investigated at varying excitation frequencies to estimate the structural damping imparted to the cable by the SMA wires. It is also very appropriate to ascertain which wire amongst one of the three SMA wires performs well. Through the study, it was found that the Ni-Ti SMA wire has a better performance in vibration suppression as compared to Cu-Zn and Cu-Al-Ni wires. Also, the effective location of the SMA wires on the model cable for vibration suppression was estimated in free as well as forced vibration cases. It is established that the attachment of the SMA wire at the mid-length of the cable gives better vibration suppression in the first mode.

Stay-cable; SMA Wires; Frequency; Damping; Vibration Dissipation; OROS Software

Structural Analysis (STA)