Is there any way in ROBOT to have two notional load cases in the same direction?
In other words, am I able to create more than four notional load cases (one in each direction; +x, -x, +y, -y).?
Thanks for the reply.
The Canadian code requires there is a notional load for each factored vertical load in each combination. This requires that multiple notional load cases are applied.
As per clause 8.4.1 of CSA S16-09
"The translational load effects produced by notional lateral loads, applied at each storey, equal to 0.005
times the factored gravity loads contributed by that storey, shall be added to the lateral loads for each load
combination. The notional lateral loads shall be applied in both orthogonal directions independently when
the three-dimensional effects of loading are included in the analysis of the structure."
Could you please explain how this works for you?
I understand this cluase this way:
- all gravity loads should be used to generate notional loadcase(s) with factor 0.005 in both orthogonal directions, so you will have finally 4 cases X+ X- Y+ Y-
- then use them for each load combination or each combination with lateral loads.
Rafal:
"all gravity loads should be used to generate notional loadcase(s) with factor 0.005 in both orthogonal directions"
"equal to 0.005 times the factored gravity loads contributed by that storey, shall be added to the lateral loads for each load combination"
Factored vertical loads for each load combination are different.
Thetefore, our interpretations is that:
for [1.2 * D + 1.4 * W + 0.5 L] ithe factored gravity loads are [1.2 * D + 0.5 * L] and
for [1.2 * D + 1.4 * W + 0.5 S] this is [1.2 * D + 0.5 * S], etc.
So notional loads need to be different for each load combination.
Is there any update on setting up more than one notional load in each direction? I've simplified the number of EHF cases to consider down to 2 but don't really want to end up with 2 parallel models at this point. Has anyone found a workaround for this?