Investigation the effect of nonlinear viscous dampers on dynamic response rebate of cable-stayed bridges under strong near and far-field earthquakes

Ali Amidfar¹ Fereshteh Emami² M.reza Mansouri³

1) Master of Earthquake Student, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2) Assistant Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
3) Assistant Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

Publication : 2th. International Conference on Civil Engineering, Architecture and Urban Development Management in Iran(caumconf.com/2nd)
Abstract :
Nowadays, considering to the effective role of passive control systems in reducing seismic demand and improving the performance of structures, the most important approaches to improving structures are increasing energy absorption and reducing seismic demand using methods such as seismic separation, reduction of structural mass and systems energy dissipation. Considering the types of bridges damaged in past earthquakes, which in most cases were due to the elastic bridge design philosophy, in this paper, along with the study of the effect of viscous damper on seismic correction of cable bridges under near-earthquake earthquakes, the effect of nonlinear modeling the cables and the viscous damper on the Świętokrzyski cable-stayed bridge in Poland are covered in the CSI Bridge-V20.2, specialized software. The results indicate a 50 to 60 percent reduction in the dynamic response of the bridge using a nonlinear viscoelastic damper. Also, due to different results of the damper in different locations of the bridge, the distance between the deck and the bridge bases is a suitable and optimal location for reducing the seismic response and increasing the performance level of the cable bridge.
Keywords : Cable-stayed bridge Viscous damper Nonlinear dynamics analysis Seismic response.