Determination of Optimal Parameters Tuned Mass Damper on Cable Bridge under Near and Far Field records

Due to the importance of bridges as vital instruments in the transportation system, the necessity of using vibration control methods against destructive factors including lateral forces such as the earthquake and wind load. These loads must be studied in order to increase efficiency and maintain safety. This study aims to reduce the structural vibration response with a Tuned Mass Damper (TMD). The structure studied in this study is a cable bridge modeled with OpenSees software. Determination of optimal parameters of the tuned mass damper will increase the efficiency of this type of damper. Optimum values of TMD parameters depend on the minimum bridge response, and the results are compared with three earthquakes near field and far field records. The independent variables studied in this study are damping ratio and angular frequency. The study results are shown that TMD has performed better performance by using near field records. The average vibration reduction is more than ۴۷% while using the far field records. This decrease is only ۳۲%. Also, based on the results of data processing in Matlab software with assuming stationary of TMD, due to the optimum parameters of TMD under the loading effect of three near field earthquake records, the line equation is obtained to determine the optimum values of the two parameters of damping ratio and angular frequency of TMD.

Keywords:

Tuned Mass Damper , Cable Bridge , ۳-D modeling , near field and far field records , damping ratio , angular frequency