Energy dissipation demand and distribution for multi-story buildings with fluid viscous dampers: Fid-Bau Portal

Energy dissipation demand and distribution for multi-story buildings with fluid viscous dampers

Zhou, Ying / Sebaq, Mohammed Samier / Xiao, Yi

Highlights • Four multi-story buildings with fluid viscous dampers (FVDs) are simulated in PERFORM-3D to obtain their energy dissipation demand and distribution. • Various levels of FVD supplemental damping ratio (ξadd) and velocity power (α) are considered. • Structural property, ξadd and α show coupling effect on energy demand and distribution. • Strong nonlinear FVDs (α = 0.3) with large values of ξadd are not effective in high-rise buildings.

Abstract The seismic response of structures with fluid viscous dampers (FVDs), which is a predominant type of structural control techniques, can be analysed from the perspective of energy. In such structures, the imposed seismic energy is mainly dissipated by the structural plastic energy, $E_{P}$ , and the energy dissipated by FVDs, $E_{d 2}$ , which quantify the structural cumulative damage and FVD’s seismic reduction effect, respectively. Research conducted in the past focuses on investigating the $E_{P}$ demand of systems without supplemental damping devices, but little knowledge is available for the $E_{P}$ and $E_{d 2}$ demand in multi-story buildings equipped with FVDs. To fill this gap, this paper conducted a comprehensive investigation based on four steel-moment resisting buildings with different height (3-, 6-, 9-, and 20-stories, respectively) equipped with linear or nonlinear FVDs. The effect of structural property and FVDs properties, characterised by the supplemental damping ratio $ξ_{add}$ and velocity power $α$ , on the $E_{P}$ and $E_{d 2}$ ‘s overall demand and distributions among stories were illustrated. The results indicate coupling effects of structural property, $ξ_{add}$ and $α$ , on the $E_{P}$ and $E_{d 2}$ demands. In most cases, the increase of $ξ_{add}$ and the decrease of α can reduce the $E_{P}$ demand and increase the $E_{d 2}$ response. However, the increasing of $ξ_{add}$ is not effective if it is larger than 20% and the FVDs with α = 0.3 are not recommended in relative high-rise buildings. The distribution pattern shows a trend of linearly decreasing along the height, but those in the high-rise buildings are disturbed by high-mode effects.