Vibration Reduction Performance of Structures with Viscous Dampers under Near-Field Earthquakes

Figure 15

(a) The power spectrum of the record n180 and main natural frequencies of the uncontrolled structure (1a, 2a indicate elastic structure; 1b, 2b indicate the structural second to third storeys of yield; 1c, 2c indicate the structural second to fifth storeys yield); (b) the power spectrum of the record n180 and main natural frequencies of the structure with VDs (1a, 2a indicate elastic structure; 1b, 2b indicate the structural yield of the second to fourth storeys; 1c, 2c indicate the structural first to fifth storeys yield). F1 and f2 are the first and second natural frequencies, respectively.

(a)

(b)