Control effect of large tuned mass damper used for seismic retrofitting of existing high-rise building

Abstract

We developed a large tuned mass damper (TMD) for counteracting the effects of long-period earthquakes in existing high-rise buildings. The TMD consists of a suspended weight and oil dampers with stroke control functions. The damper increases its damping coefficient when the TMD weight velocity reaches a predetermined value, preventing overstroke during large earthquakes. The system controls the TMD stroke with minimum impact on its response control performance. This paper describes the development and application of the TMD and verification of the response control performance using observation records. First, we examine the requirements for this type of TMD using a simple analytical model and determine the influence of the stroke control on the response control performance. Next, an example application is outlined. The components required for realization of the TMD are addressed, and a project for the seismic upgrade of an existing high-rise building is described. To evaluate the response control performance, we developed accurate simulation models for the building and TMD, and we analytically confirmed the response control performance. Finally, this paper presents observation records obtained during an earthquake and strong wind. The control effect of the TMD was verified through comparison of the observation records and analytical results.