Mode Shape in Etabs
Mode Shape in Etabs
(OP)
Hi Guys,
I am curious why does ETABS report mode shape with units. Back in my uni day, I was constantly reminded by my professor that the mode shape is mathematically just an eigenvector...It does not have "any" real magnitude and only indicate the shape of the structure.
Is there any reasons why ETABS report mode shape with unit? Is it different compare to the classical modal analysis technique?
Thanks.
I am curious why does ETABS report mode shape with units. Back in my uni day, I was constantly reminded by my professor that the mode shape is mathematically just an eigenvector...It does not have "any" real magnitude and only indicate the shape of the structure.
Is there any reasons why ETABS report mode shape with unit? Is it different compare to the classical modal analysis technique?
Thanks.





RE: Mode Shape in Etabs
RE: Mode Shape in Etabs
When you look at eigenvalue (i.e time period or frequency) - Etabs provide them in terms of unit of time (say seconds for period and Hz for frequency) but my when displaying the mode shape in tabular form, it provides mode shape of every floor in terms of mm...Now the question is why? Magnitude of mode shape should not have "any" real magnitude as it is just an indication of the mode shape.
RE: Mode Shape in Etabs
RE: Mode Shape in Etabs