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API-653 Addendum 1 updates (December 1996) incorporated. Note, this addendum changes the equation used in computing the allowable stress for the thickness design of shell courses 1 and 2.
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Added Double-I beams to AISC structural database.
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Added roof-plate corrosion allowance and center column cap diameter to roof input spreadsheet.
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Added multiple structural steel databases (includes five overseas databases).
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Allowances for “user specified” time/date stamps on output reports.