Structural Modelling using Etabs 2018

Display then goto structure output then modal information then modal participating mass ratio then we observe that

sum Ux=99%

sum Uy=99%

10 modes are sufficient

upto 10 modes 94% (sum Ux)

Rotational degree Rx, Ry, Rz not sufficient

it should be 90%

period of vibration

mode1=1.34

mode2=1.184

Display then go to story response spectrum

max story drift

EQx is upto 2

EQy upto 1.8

from base plan

we see from load combination UDCon S29 to UD Con S40

from elevation 6

all columns are in compression

and any shear wall is in tension

In shear wall actual load ratio=0.28

we see from UDCon S23

Fz=4019kn

axial load ratio=4019*1000/450*600*30=0.496