Hi everyone hope you're all doing well I'm Gabriel I'm structural engineer and continuing
on from part two of this four part series today we're going to go over load case so I'll show
you how you can apply dead loads and live loads and we'll have a quick look at deflection and
bending moment diagrams and finally we're gonna run a wind load simulation let's get into it
all right our structure is looking good so it's time to apply some loads
go to load types define the nature and the name of the loads I'm creating dead and live loads for
roof and floor so we have here that load for the roof um just click add let's do a live load for
let's do a live load for the floor and then just click add
and just do the same same procedure for all dead loads and live loads for roof and floors
just click add and then click close
on this drop down menu select the floor that load case and and then select the floor frame
for the bottom module and isolate it so it's going to make it easier to visualize
select the panels and on load definition
I'm going to choose surface uniform planner loads and then -1 kpa at global z direction
with the panel selected select click apply
you can verify if the loads have been applied by turning load symbols on
now let's repeat the same the same process for the floor of the top module
so select the floor framing isolate them and select again only the panels on load definition
let's apply the same -1 kpa to the panels
turn load symbols on and double check if the loads have been assigned properly
now let's apply the roof dead load all right so select all the roof panels
and now I'm going to use 0.15 kpa surface load so just go 0.15 kpa minus 0.15
I selected the roof beams by accident so now i'm going to select only the roof panels
just select all the roof panels and then
and then click apply
cool the dead loads are have been applied now let's jump to live loads
starting with the floor panels of the bottom module
let's just select all the panels of the bottom module
and i'm going to apply a surface area of 1.5 kpa minus 1.5 kpa
okay cool so i'm now i'm gonna isolate the
top module for framing just to make it easier to visualize
I think it's it's that's a bad idea you gotta make something to just to make easier for you to see
all the members that you apply in the loads that's why you add it in a new in a new window
so here is the same 1.5 kpa for floor live loads
now the roof panels will be subjected to a 0.25 kpa live load so let's select them all
here all the roof panels
and let's apply zero point minus 0.25
kpa add and apply
okay let's let's run an analysis to see if our model presents any errors or
um if we get any message from robot let's just go and click in calculations
and so you've got a message in blue and it's just a warning saying that
the claddings haven't been assigned any thickness and the finite element mesh has not been generated
which is fine because we're not designing the panels so that's not an issue
so from here you can check the results in diagram for bars
in parameters change the description to labels and filling into filled and we can have a quick look
at the deflection of the structure let's normalize the scale turn off section shape
and you can notice here that my largest deflection on the roof under roof live load is 5 millimeters
and you can isolate the elements to check them separately if you will
so the deflections will change according to the load case you are analyzing
so you've got that loads live loads and then you've got your deflection changing
yeah so you can play around with deflections have a look how the structure deforms for different
load case if you're already getting excessive deflections for that load for instance you can
expect an even higher deflection under a load combination hence you you can start
considering upsizing sections or reducing spans, you can check bending moment diagrams
make sure the shape of the diagrams looks like what you were expecting
soon after we define our load combinations we can go through
stresses and shear and axial force diagrams as well. okay now let's go over a wind load simulation
turn panel's interior ON go to loads wind load simulation and generate wind loads
here you have the options to choose wind directions
when the parameters such as wind velocity or
wind pressure for instance let's say 30 meters per second and then in wind exposure we're gonna
select all the panels just right click on the panel select similar and select by thickness
now just copy and paste the elements from here to here and click start
now just let robot do its magic
and based on on the 30 meters per second wind speed you're already able
to picture how the pressures will be distributed by watching this simulation it's it's pretty cool
you can also get the wind loads from AS1170.2 and make a comparison between both pressures
that that would be a pretty interesting homework for you to do. even though you should check wind
for other directions for learning purpose as you can see I simulated wind coming from only one
direction
all right the simulation is completed
let's have a look at the pressure maps
select wind x in the drop down turn load symbols on and you'll have a pretty good idea of how the
pressures are distributed for instance there is a maximum of 0.81 kpa acting on the windward wall
and it go and it could go to a negative pressure of minus 0.81 kpa at some areas
so this was the end of our third video of this four part series in autodesk robot
we've got the last video coming up and I'm going to show i'm going to show you how to analyze the
um how to see deflections and bending moment diagrams
shear force diagrams axial force diagrams um have a look at the stresses and that's pretty
much it if you have any questions or would like to add something just drop a comment below
if you liked the video consider giving it a thumbs up um and i'll see you next time thank you