Effectiveness of Tuned Mass Dampers in Seismic Response Control of Isolated Bridges Including Soil-Structure Interaction

Abstract

The effect of soil-structure interaction (SSI) on the dynamic responses of seismically isolated three-span continuous reinforced concrete (RC) bridge is investigated. Also, tuned mass damper(s) (TMD/s) is/are installed to control undesirable bearing displacement, even under the SSI effect. The TMDs are placed at the midspan of the bridge and each tuned with a modal frequency, while controlling up to first few modes as desirable. The soil surrounding the foundation of pier is modeled by frequency independent coefficients. Dynamic analysis is carried out in time domain using direct integration method. In order to specify the effects of the SSI, the responses of the non-isolated, isolated, and controlled isolated bridge are compared. It is observed that the soil surrounding the pier has significant effects on the bearing displacement of the isolated RC bridges. In addition, it is observed that the seismic responses of isolated RC bridge reduced significantly with installation of the TMDs.

The Structure-Soil-Structure Interaction Effects on the Response of the Neighbouring Frame Structures

“…The structural elements are idealised as the linear-elastic materials with Rayleigh damping. The damping ratio of structures is assumed to be 0.05 (Ghazvini et al, 2013;Wang et al, 2013;Elias and Matsagar, 2017). Rayleigh damping is a linear combination of the mass and stiffness matrices, and it can be calculated by the following equation,…”

Bridges

“…It defines how quickly a seismically damaged bridge can be restored to its functional use again. Some advanced dynamic response control devices, such as base isolation and tuned mass dampers, have been proposed to effectively limit the forces induced in bridges because of earthquakes and strong winds or enhance their seismic performance (Matsagar and Jangid 2006;Matin et al 2017;Elias and Matsagar 2017). Furthermore, in those areas that experience more than one hazard, the bridges are analyzed for multihazard effects.…”

Vibration control of bridges under simultaneous effects of earthquake and moving loads using steel pipe dampers

“…However, the convective accelerations and the inertial acts of the moving vehicles were disregarded in most of the above-mentioned studies. Elias and Matsagar (2017) developed a modified modal analysis approach to investigate the effectiveness of tuned mass dampers on isolated RC bridges including soil-structure interaction under horizontal earthquake excitations. A similar approach was then adopted by Matin et al (2019) to study the effectiveness of distributed multiple tuned mass dampers in seismic response control of bridges under two horizontal components of earthquake ground motions.…”