Difference between the actual & design axial load in ETABS

[ibrahemnasr]

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 KN , The program design for 226 KN )

but for other load combinations containing dead or live loads , the program design for the actual axial load

i search alot for the reason , i think this is because reducing live load or LLRF but i turn them off and nothing happen

 

[ibrahemnasr]

any one can tell me the reason why Etabs reduce the axial loads in the design process?

 

[ahmedhegazi]

check your design parameters , this happend when you apply live load reduction factor which is the default setting in Etabs

 

[ibrahemnasr]

i've already cancel live load reduction factor and use "no live load reduction" method , and also use "pattern live load factor = 0 "
to cancel all live load reduction to column or slabs

may be another reason