ETABS 2015: Uplift from Dead Load in shear walls
ETABS 2015: Uplift from Dead Load in shear walls
(OP)
In my model I was getting uplift from dead load in a couple of my shear walls. I thought it might be moment or something being driven into the wall at some floor, but I was able to isolate it to the self weight of the wall. For some reason, when I include the self weight of the wall I'm getting uplift at the bottom.
I'm using 10"CMU walls that are defined as thick shells, meshed at a 4'x4' pattern.
Any thoughts on what might be causing this?
I'm using 10"CMU walls that are defined as thick shells, meshed at a 4'x4' pattern.
Any thoughts on what might be causing this?





RE: ETABS 2015: Uplift from Dead Load in shear walls
Most odd uplifts I've seen are at short end spans of long continuous members or sometimes you'll see load shed from one element to another nearby element if their stiffnesses are sufficiently different. See the latter quite a bit when we have cracked factors on walls because the way ETABS handles wall crack factors, you'll decrease your axial stiffness as well (not just flexural stiffness). So if they're near or even on top of a column, you'll have a full axial stiffness column leeching load out of a diminished axial stiffness wall.
RE: ETABS 2015: Uplift from Dead Load in shear walls
RE: ETABS 2015: Uplift from Dead Load in shear walls
Do you have any stiffness modifiers applied?