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{live-template:Test Problem}
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A [shell|kb:Shell] |
A shell object,
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simply
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supported
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at
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its
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corners,
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is
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shown
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on
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the
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left
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side
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of
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Figure
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1.
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The
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images
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on
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the
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right
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side
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present
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the
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same
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shell
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object
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with
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an
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edge
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beam
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along
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its
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side.
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Question
These shell objects are meshed using 4x4 sub-elements,
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though
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no
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connection
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is
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created
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between
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the
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shell
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and
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the
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edge
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beam.
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Given
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this
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condition,
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I
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would
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expect
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the
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shell
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and
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beam
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to
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deflect
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independently
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from
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one
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another.
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However,
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the
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deflection
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contours
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indicate
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that
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the
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beam
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stiffens
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the
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system
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against
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out-of-plane
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behavior.
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Is
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there
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an
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explanation?
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And
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how
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are
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these
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components
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modeled
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to
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behave
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independently?
Answer
When frame and shell objects are meshed, joints are created along their interface, then merged by default. If this connection is not desired, divide the objects explicitly, then select the merged joints which were automatically created. Select Edit > Point > Disconnect to create duplicate joints at the same location. Selected degrees of freedom (DOF) may then be reconnected, if desired, using weld constraints.
Attachments
- SAP2000 V12.0.0 model (zipped SDB file)