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Additional information may be found in the Mass units article and in the CSI Analysis Reference Manual (Joints and Degrees of Freedom > Masses, page 39).

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Related Incidents:

  • Incident 30627: Mass input questions
    • The following explanation is provided in Incident 30267: In SAP2000, the basic units are Force (lb, kip, N, kN, etc.), Length (ft, in, m, mm, etc.), Time (second), and Temperature (F, C). Mass is a derived unit and SAP2000 does not use lb or kip for mass units, they are only used for force units. Weight has units of F, where F is force. CONSISTENT mass units are given by F/(L/T^2), where L is length, T is time, and the mass units are simply force divided by UNIT acceleration.