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This work was supported by the National Science Foundation under NSF grant number CMMI 0726684, and by the NEHRP Consultants Joint Venture (a partnership of the Consortium of Universities for Research in Earthquake Engineering and Applied Technology Council), under Contract SB134107CQ0019, Earthquake Structural and Engineering Research, issued by the National Institute of Standards and Technology, for project ATC-82. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect those of the sponsors.
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