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RAM | STAAD | ADINA Wiki Very Small Lateral SE Forces from Ram Frame
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    Very Small Lateral SE Forces from Ram Frame

      Applies To 
      Product(s): RAM Concept; RAM Structural System
      Version(s): 5.2 and 14.07 or later
      Area:  Import/Export
      Original Author: Bentley Technical Support Group

    Why are the column reactions in the Lateral loads so small?

    In Ram Structural System 14.07 a change was made in the behavior of 2-way slabs under lateral loads. To prevent the slab from coupling lateral walls and columns together the out-of-plane stiffness is ignored in those lateral load cases when the diaphragm is set to rigid. With the out-of-plane stiffness near zero, the unbalanced forces in lateral columns above and below the slab are necessarily tiny.

    Solution

    In order to have the out of plane stiffness considered under lateral loads the diaphragm at the level being exported to Ram Concept must be set to semi-rigid. 

    See Also

    RAM Concept Lateral Self Equilibrium Analysis [TN]

    RAMSS Two Way Decks

    RAM Frame - Criteria - Diaphragms

    • import
    • RAM Structural System
    • RAM Concept
    • Lateral SE
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    • Seth Guthrie Created by Bentley Colleague Seth Guthrie
    • When: Thu, Sep 24 2015 6:39 PM
    • Seth Guthrie Last revision by Bentley Colleague Seth Guthrie
    • When: Fri, Jan 22 2021 11:32 AM
    • Revisions: 3
    • Comments: 0
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