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

Ammanagi, S and Manohar, CS (2015) Optimal input cross-power spectra in shake table testing of asymmetric structures. In: EARTHQUAKES AND STRUCTURES, 9 (5). pp. 1115-1132.

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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.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the TECHNO-PRESS, PO BOX 33, YUSEONG, DAEJEON 305-600, SOUTH KOREA
Keywords: random vibration; multi-component earthquake support motion; critical excitation models; shake table testing
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 18 Feb 2016 06:22
Last Modified: 18 Feb 2016 06:22
URI: http://eprints.iisc.ac.in/id/eprint/53259

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