ETABs tutorial video 8 | Design forces on elements in etabs | extract data from etabs | Nilesh Jha

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An envelope-type load combination should not be defined for design because ETABS, SAFE, and SAP2000 consider each load combination separately, generate a design for each load combination, then envelope this resultant set of design specifications to provide maximum positive and negative reinforcement. When an envelope combination is defined manually, the maximum moment, shear, axial, and torsional response from all load combinations are superimposed on a single design process which generates an over-designed system with capacity for unrealistically extreme loading.
source: wiki.csiameric...
The envelope of the load combinations in any analysis software would give you the extreme results (Forces/Deformations) but not the corresponding results.
For example, consider two points, say A and B on a structure. Let's assume that you have defined 2 load combinations of the primary loads. Let's say for the combination 1, the maximum bending moment at point A is 1000 kNm and point B is -200 kNm and for the combination 2, the values are 500 kNm and 800 kNm respectively.
Now when you switch on the maximum envelope and check the bending moments, it will show 1000 kNm and 800 kNm at point A and B respectively. Please note that there values doesn't corresponding to the same load combination i.e. they will not occur simultaneously.
Similarly, when you check the bending moments for the minimum envelope, it will show 500 kNm and -200 kNm at points A and B respectively. Again, these values doesn't occur at points A and B respectively at the same time.
The same can be extended to deformations. If you look for the deformed shape for an envelope, it will show the extreme values of displacements at all the points and they may not occur simultaneously. As a consequence, you might observe openings in the mesh or between the structural elements. This doesn't mean the model is incorrect.
It is suggested to analyse the deformed shape for a particular combination but not the envelope. But to get the maximum values of the displacement you can turn to the envelope.
Hope this helps you :)
source: www.quora.com/...

[@dagnadessie751]

is that possible to get detail from ETABS for construction? if it is how?

[@parthasarathi9491]

content was nice plz mute the background music....