Analysis and Design of Steel Structures Equipped with Pressure- Adjustment Fluid Viscous Dampers for Wind-And-Seismic Double- Excitation Vibration Mitigation

Abstract

<p>Fluid viscous dampers have been successfully and extensively adopted in both existing and new structures to improve structural performance under external excitations, namely wind and seismic excitations. During excessively large excitations, the failure of fluid viscous dampers can affect the structural dynamic performance as the supplementary damping is reduced significantly or completely. This study introduces a pressure-adjustment fluid viscous damper (PA-FVD, hereafter) consisting of pressure-adjusting devices to limit generated axial force and potentially prevent failure associated with its high axial force. Steel structures equipped with traditional FVDs and PA-FVDs is presented to compare important structural performance indices including acceleration, velocity, and displacement time history; additional damping ratio; and maximum structural internal forces under wind and seismic excitations. The analytical results have shown a substantially better structural response when the structure is equipped with PA-FVDs.</p>