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NOTE: An overview of ramp modeling is given in the ETABS 09 -- Linear Ramps video tutorial |
How do I design columns when unbraced length is especially long?
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To design such columns, refer to the lower column segment. The software will apply the appropriate length factor to these segments and correctly calculate the actual design length. The lower column will then govern design of the entire column.
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How should I deal with center of mass for ramps?
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ANSWER: Since diaphragms are not assigned to ramps, and only to horizontal area objects, diaphragms are usually assigned to levels above and below each ramp. Center of mass is then calculated according to nodal masses, therefore proper meshing is important for the distribution of mass and the accuracy of the center-of-mass location.
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How do I find the ramp area?
ANSWER: Since floor area only applies to horizontal area objects, ramp area should be found using weight, unit weight, and thickness properties.
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