calculation of sway and non sway column in Etabs
calculation of sway and non sway column in Etabs
(OP)
Hi guys,
Etabs doent calculate the Q proposed by the ACI to determine a floor if its sway or non sway. I took an example of a one single column fixed at the base, length = 8m and i run the calculation. In the summary, k = 1 which its wrong.
In addition to that, i think that there is a bug in the delta s because, in the same example, i changed the k to k = 2 and i took a look to the new straining actions. The calculation of delta ns (moment magnification factor for the non sway) has changed and the delta s hasnt which is wrong.
Any help would be greatful. Try to take the same example and u'll see.
Many thanks
Etabs doent calculate the Q proposed by the ACI to determine a floor if its sway or non sway. I took an example of a one single column fixed at the base, length = 8m and i run the calculation. In the summary, k = 1 which its wrong.
In addition to that, i think that there is a bug in the delta s because, in the same example, i changed the k to k = 2 and i took a look to the new straining actions. The calculation of delta ns (moment magnification factor for the non sway) has changed and the delta s hasnt which is wrong.
Any help would be greatful. Try to take the same example and u'll see.
Many thanks





RE: calculation of sway and non sway column in Etabs
Etabs has an approach which you can see in it's help and tutorial. based on that it is assumed that you have run a P-Delta analysis. therefore K is always considered as 1 as well as delta s.
Hope helps
RE: calculation of sway and non sway column in Etabs
RE: calculation of sway and non sway column in Etabs
which is completely the same as etabs.
if it is sway according to 10.13.4 the magnified delta s*Ms is the same as end moment Ms and if you go back to 10.13.3
M2 = M2ns+M2s.
so when you have M2 you will have Mc=Delta ns * M2 which is the same as for nonsway frames.
2. If you don't want to run a p-delta analysis you have the chance to use other ACI clauses and determine K and delta s
Hope it is usefull
RE: calculation of sway and non sway column in Etabs
RE: calculation of sway and non sway column in Etabs
RE: calculation of sway and non sway column in Etabs
Of course you can. Only if you have the Lord Almighty holding the transfer beam with a cable from above.
You can release moment, but you cannot release shear. The beam will be unsupported then.