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These are user-defined drift nodes which act completely independent of the more automated Diaphragm and Elevation drift results and offer flexibility for cases where the Diaphragm or Elevation options don't give the output needed.įor story height, the vertical axis is used to determine the Node definitions never look at the nodes in a Diaphragm or Elevation definition. To calculate inter-story drift for a particular direction, the displacement at the lower level is subtracted from the current story displacement.įor example, to calculate X direction drift for story 2, the X displacementįor the node representing story 1 is subtracted from the X displacementįor Diaphragm and Elevation definitions, the drift calculations are only done at locations where columns or walls have nodes at the current level and at the level below.įor NodeDefinitions, the calculations are done for the current defined drift node compared to the nearest defined drift node at a the level below. The results are reported in the order in which they appear in the Drift Definitions spreadsheet. This report lists the drift for all defined Diaphragms, Elevations and Nodes that exist in the Drift Definitions spreadsheet. Access the Story Drift spreadsheet by selecting it from the Results Once the solution is performed you may view the drift
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