Lack of correlation (incoherence) modeling and effect from realistic 3D inclined, body and surface seismic motions

An abstract of the technical paper presented at:
San Francisco, California, USA
August 18–23, 2013

Prepared by:
N. Tafazzoli1, T. Ancheta2, N. Orbovic3 and B. Jeremic4

1University of California, Davis, CA, U.S.A.
2Risk Management Solutions, Inc., Newark, California, U.S.A.
3CNSC, Ottawa, Canada
4Lawrence Berkeley National Laboratory, Berkeley, CA, U.S.A.


In this paper we explore the issue of realistic, 3D, inclined body and surface wave seismic motions that are used as an input to 3D, time domain, nonlinear analysis of NPPs and lack of correlation (incoherence, as it is known in the frequency domain). One of the main topics addressed here is the development of un-correlated (incoherent) motions for a full 3D case.

Un-correlated motions in full 3D can be developed by realizing that all three spatial axes (main, radial horizontal direction, along the principal direction of wave propagation motions (in our case X), transverse horizontal direction (in our case Y) and the vertical direction) do exhibit lack of correlation (incoherence). Coherency models using the vertical component of array data are independently developed from the horizontal. This existence of three spatial directions of lack of correlation requires existence of data and models for all three directions. In addition to incoherent motions developed using layered half space simulations, a different set of incoherent motions was developed in order to test the effects incoherency has on NPP response.

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