Seismic performance assessment of structure with hybrid passive energy dissipation device

Abstract

This study aims at the development of a new hybrid passive energy dissipation device (HPED) which is a combination of X-plate added damping and stiffness damper (XADAS) and friction damper (FD) for improving the seismic performance of structure subjected to earthquakes with different peak ground acceleration values. The advantage of HPED when compared to XADAS and FD of same yield strength as HPED is that only FD dissipates the input seismic energy for earthquakes with low peak ground acceleration value and for earthquakes with high peak ground acceleration value both FD and XADAS works simultaneously to dissipates input seismic energy. Cyclic loading tests were conducted on HPED, XADAS and FD of same yield strength to evaluate their energy dissipation capacity and the tests results shows that HPED dissipated more amount of energy when compared to XADAS and FD. An eight storey reinforced concrete building was retrofitted with HPED and nonlinear time history analysis was used to compare the response of structure with HPED, with XADAS and with FD of same yield strength under eight different earthquake ground motions. In addition to this seismic fragility analysis was also performed. According to nonlinear time history analysis results when the building is retrofitted with XADAS, FD and HPED the percentages of reduction of average of maximum inter-storey drift are 52.9, 58.8 and 66.6 respectively and the percentages of reduction of average of maximum roof displacements are 51.3, 54.5 and 68 respectively and similarly the percentages of reduction of average of maximum base shears are 38, 32.4 and 56 respectively. So HPED is performing better than XADAS and FD in reducing inter-storey drift, roof displacements and base shear. Results also show that HPED is dissipating more amount of seismic input energy when compared to XADAS and FD under earthquakes with different peak ground acceleration values. Fragility analysis results show that probability of reaching the collapse state is reduced by HPED when compared to XADAS and FD.