Analysis problem on ETABS
Analysis problem on ETABS
(OP)
Dear All,
i use ETABS to do analysis of RCC building. sometimes i get that rebar percentage of column bottom portion is lower than the top portion of that column. for example today i have got at bottom portion (Ground floor) rebar percentage is 1.2% but in the top portion (10th floor) rebar percentage is 2.28%.
my questions are why these things are happening? and what is the solution to make design okay.
there is no error message in that analysis.
Thank you.
Engr. Faisal
i use ETABS to do analysis of RCC building. sometimes i get that rebar percentage of column bottom portion is lower than the top portion of that column. for example today i have got at bottom portion (Ground floor) rebar percentage is 1.2% but in the top portion (10th floor) rebar percentage is 2.28%.
my questions are why these things are happening? and what is the solution to make design okay.
there is no error message in that analysis.
Thank you.
Engr. Faisal






RE: Analysis problem on ETABS
RE: Analysis problem on ETABS
what is not the function of ETABS? its not clear.i took the value of rebar percentage of cross sectional area of column from ETABS and then provide column reinforcement on that basis.
and what is the solution when upper portion of column needed more reinforcement than the lower portion?
Thank you.
Faisal
RE: Analysis problem on ETABS
RE: Analysis problem on ETABS
Thank you.
Faisal
RE: Analysis problem on ETABS
Too answer your specific question, I reckon it would have to do with moments and effective lengths. The columns will attract a higher percentage of the lateral forces towards the top of the building thru frame action and the core will take over as you run down the building.
Does etabs calculate effective lengths?
RE: Analysis problem on ETABS
RE: Analysis problem on ETABS
Thank you.
RE: Analysis problem on ETABS