Analysis on the Mechanism for Baseline Drift of near-Fault Accelerograms

Yu Shi Wang; Xiao Jun Li

doi:10.4028/www.scientific.net/AMM.166-169.2078

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 166-169Analysis on the Mechanism for Baseline Drift of...

Analysis on the Mechanism for Baseline Drift of near-Fault Accelerograms

Abstract:

Accelerograms recorded by accelerographs are of fundamental importance in seismic engineering, forming the basis of ground shaking employed for anti-seismic design. By analysis on the general solution of wave equation, this article demonstrated that the ground tilting is related with the ground velocity and displacement histories. For accelerograms with co-seismic permanent displacement, this ground tilting would be presented continuously with a tiny constant value after severe shock terminated. The co-seismic permanent displacement might be the reason of baseline drift, which caused that the real velocity and displacement histories could not be achieved by the direct integration of accelerograms. A baseline correction method was also proposed based on this finding, with which the ground velocity and displacement histories of several near-fault stations were given. But this proposed method still needed improvement because of the divergence in its iterative process.

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Periodical:

Applied Mechanics and Materials (Volumes 166-169)

Pages:

2078-2082

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.166-169.2078

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Online since:

May 2012

Authors:

Yu Shi Wang, Xiao Jun Li

Keywords:

Accelerogram, Baseline Correction, Baseline Drift, Co-Seismic Permanent Displacement, Strong Ground Motion

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