Reduction of structural response to near fault earthquakes by seismic isolation columns and variable friction dampers |
| |
| Authors: | Y Ribakov |
| |
| Institution: | Department of Civil Engineering, Ariel University Center of Samaria, Israel |
| |
| Abstract: | This paper focuses on the investigation of a hybrid seismic isolation system with passive variable friction dampers for protection
of structures against near fault earthquakes. The seismic isolation can be implemented by replacing the conventional columns
fixed to the foundations by seismic isolating ones. These columns allow horizontal displacement between the superstructure
and the foundations and decouple the building from the damaging earthquake motion. As a result, the forces in the structural
elements decrease and damage that may be caused to the building by the earthquake significantly decreases. However, this positive
effect is achieved on account of displacements occurring in the isolating columns. These displacements become very large when
the structure is subjected to a strong earthquake. In this case, impact may occur between the parts of the isolating column
yielding their damage or collapse. In order to limit the displacements in the isolating columns, it is proposed to add variable
friction dampers. A method for selecting the dampers’ properties is proposed. It is carried out using an artificial ground
motion record and optimal active control algorithm. Numerical simulation of a sevenstory structure shows that the proposed
method allows efficient reduction in structural response and limits the displacements at the seismic isolating columns. |
| |
| Keywords: | seismic isolating columns variable friction dampers hybrid seismic isolation near fault earthquakes control algorithm |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
