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This page is devoted to frequently asked questions (FAQ) related to modeling techniques in SAFE. |
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Formulation
Should I use thin-plate or thick-plate formulation during analysis?
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We recommend using the Mindlin thick-plate formulation since it accounts for shear behavior, without significantly increasing the time of computation. The Thin vs. Thick shells article provides additional discussion on the attributes and comparisons between both options.
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Why does SAFE restrain Rx and Ry on top of columns above slabs, but not walls above slabs?
Answer: For vertical systems that extend above slabs, restraints are applied to the top of columns, but not walls, because large moment values will then develop along the top of walls. We generally recommend that you do not apply restraints to the top of walls. To manually attach the top of walls and columns to a rigid diaphragm above, select Run > Advanced Modeling Options > Add Special Constraints.
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Modeling
How is column/wall height changed within a SAFE model?
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- Specify new Z-coordinates for these points, which will increase or decrease the height as specified.
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How is the automatic column location changed?
Answer: To overwrite automatic column locations, select the columns to be edited, then select Design > Punching-Shear Overwrites. As illustrated in the Tooltip, the default configuration may be changed to any one of a variety of location types.
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How do I model a raft foundation?
Extended Question: To model a raft foundation, should I select the mat option, or should I and assign the thick-plate formulation to a slab-on-grade?
ANSWER: A raft foundation may be modeled using either the the mat option or , and either a thick -plate slab-on-gradeor thin plate formulation. The only difference in output involves slight variations in rebar between a mat, slab or footing option are in detailing. Analysis and design is otherwise the same.
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Group editing
How are section properties changed for all slab sections of a certain type?
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Answer: Select each slab section, then change the rebar material for all segments through Edit > Interactive Database Editing > Design Data > Finite Element Based.
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