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http://dx.doi.org/10.12989/eas.2015.9.5.1115

Optimal input cross-power spectra in shake table testing of asymmetric structures  

Ammanagi, S. (Department of Civil Engineering, Indian Institute of Science)
Manohar, C.S. (Department of Civil Engineering, Indian Institute of Science)
Publication Information
Earthquakes and Structures / v.9, no.5, 2015 , pp. 1115-1132 More about this Journal
Abstract
The study considers earthquake shake table testing of bending-torsion coupled structures under multi-component stationary random earthquake excitations. An experimental procedure to arrive at the optimal excitation cross-power spectral density (psd) functions which maximize/minimize the steady state variance of a chosen response variable is proposed. These optimal functions are shown to be derivable in terms of a set of system frequency response functions which could be measured experimentally without necessitating an idealized mathematical model to be postulated for the structure under study. The relationship between these optimized cross-psd functions to the most favourable/least favourable angle of incidence of seismic waves on the structure is noted. The optimal functions are also shown to be system dependent, mathematically the sharpest, and correspond to neither fully correlated motions nor independent motions. The proposed experimental procedure is demonstrated through shake table studies on two laboratory scale building frame models.
Keywords
random vibration; multi-component earthquake support motion; critical excitation models; shake table testing;
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