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BCSSTK25: BCS Structural Engineering Matrices (eigenvalue problems)
Columbia Center (Seattle) 76-story skyscraper

from set BCSSTRUC3, from the Harwell-Boeing Collection

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From generalized eigenvalue problem Kx=(lambda)Mx. This is matrix K; matrix M is BCSSTM25 from BCSSTRUC3 set.


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Visualizations

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Structure Plot City Plot
structure plot city plot


Matrix Statistics

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Size Type
15439 x 15439, 133840 entries real symmetric indefinite
Nonzeros
totaldiagonalbelow diagonalabove diagonalA-A'
252241 15439 118401 118401 0
Column Data Row Data
Average nonzeros per column : 16
Standard deviation : 7.1

indexnonzeros
longest13017 59
shortest3 2

Average nonzeros per row : 16
Standard deviation : 7.1

indexnonzeros
longest13017 59
shortest3 2

Bandwidths Profile Storage
lower293 upper293
average |i-j|99 std.dev.90
minmaxave.std.dev.
lower bandwidth1 293 1.9e+02 40
upper bandwidth1 293 1.9e+02 40

Symmetric skyline storage requirement:2959629

Heaviest diagonals
offset from main0 -2 2 -4 4 -1 1 -6 6 -3
nonzeros15439 8919 8919 6321 6321 5802 5802 4242 4242 3863
accumulated percent 6.12 9.6613.1915.7018.2020.5022.8024.4926.1727.70

Top 10 out of 583 nonvoid diagonals.
Conditioning
Frobenius norm3.2e+15 condition number (est.)65
2-norm (est.)1.1e+15 diagonal dominanceno


Set Information

Set BCSSTRUC3
Source: John Lewis, Boeing Computer Services, Seattle, WA
Discipline:Dynamic analyses in structural engineering
Accession:Summer 1984 to spring 1985


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Last change in this page: Wed Sep 22 13:33:26 US/Eastern 2004 [Comments: ]