A Study of the Correlation of the Components of Instructure Motions During Earthquakes

by A. H. Hadjian, Bechtel Power Corp, Los Angeles, CA, USA,

Document Type: Proceeding Paper

Part of: Structural Engineering in Nuclear Facilities


Thirty-two buildings are selected that have all three components of motion recorded in the basement, midheight and top of the structure. The correlation coefficients of these motions, as a function of the orientation of recorder, is generated and evaluated. The effects of the structural characteristics on these motions are studied by comparing the top and midheight correlation functions with those of the basement records. Additionally, nine structures, whose design details are available in the technical literature, are selected for more detailed studies. Considering the fact that as-built structures tend to have a multitude of details that lead to non-symmetry, most of the structures studied tended towards increased correlation at the roof level. In a few cases the torsional response was accentuated due to a softening in one principal axis more than in the other as a direct result of structural damage. At midheight the correlation was reduced due to the fact that for highrise buildings the second and higher modes are significant contributors to the total structural response and tend to have a mode at about this level for either of the principal axes.

Subject Headings: Motion (dynamics) | Correlation | Ground motion | Earthquakes | Basements | Load and resistance factor design | Earthquake resistant structures | Seismic design

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