after the analysis completed i notice this warning in the log file
* * * W A R N I N G * * *
EIGENVALUE 20 WAS FOUND OUT OF SEQUENCE
i also notice that the tipe periods are very giant (like 906690 sec) and also the program did not capture any mode shapes
i try using Ritz vector...
after i make P-delta analysis on Etabs i get the bending moment decreased on column however it must be amplified
I did the following:
- I decrease the stiffness due to cracks according to ACI,i use 0.7 for I2 and I3 in columns , and 0.35 for I3 in beams, and 0.25 for f11,f22,f12 in slabs...
I wanna ask is it acceptable to reduce the diameter reinforcement in one column from 20mm to 12mm in the next upper story?
or i should use to successive diameter (from 20mm to 18mm and fro 18mm to 16mm) is this true?
hi every body
i have question regarding the design of concrete columns using ETABS
1- For the load combination containing the response spectrum load case , ETABS design for another axial load different from the actual axial load from the same combination
(the Actual analysis axial load = 345...
hi every body
i have question regarding the design of concrete columns using ETABS
1- For the load combination containing the response spectrum load case , ETABS design for another axial load different from the actual axial load from the same combination
(the Actual analysis axial load =...
i want to know what is the best position for the grade beam that connect the footings in the case of combined footing? is it from column to column or from the center to center of footings?
