CSI ETABS – 03 – Wind Loads, Exposure from Extents of Diaphragms & Exposure Shell Objects | Part 4

Now for the defining of Wind Loads I will
go in the define, load patterns I will write WIND select the load type WIND
and select the cord according to which I want to apply the Wind loads I will
select your bit 397 you can select the code according to your location of your
country here wind load or your country which code is following your busy 97 so
here are the parameters for demon lord so Belgium there are basically two
different options for develop your application now first one is exposure
from extent of diaphragms and second exposure exposure from shell objects
when you select the second option then these parameters will become inactive
here you can see so I will discuss the second parameter later for the first
parameter here is the Windward coefficients and leeward coefficient and
for example in the plane areas where there is no gable roofs for example only
the wind all applied on the walls for that you can select the parameters for
the wall method one normal force method windward wall point eight inwards and
for labor ball 0.5 hovered and fire similarly for ropes Wilber rose for
Libra ropes depending upon the slope you can select the parameters here is 0.8
0.5 so here is 0.8 and 0.5 and wind or directions and exposure bits here you
can put manually by yourself or software automatically calculate and first one is
zero degree for x-direction two is the ninety degree for y-direction
so how this works for example if in a city the maximum speed I will put here
so for example in our area we maximum speed is 1:05 and the exposure type
there are 3 exposure type BCD it depends upon the building location if the
building situated near the sea area sea area or in the plane area then the wind
effect will be more and if the building located in the located in the congested
area in a wrong City then the bid effects on the buildings will become
less so depending upon the exposure time you will select the they category that
exposure type importance factor similarly it depends upon the buildings
and from where to where we want to apply from the base of the story to the top
story so what is the exposure type here is a basic wind speed definition expired
type B is has a terrain with buildings forest or surface irregularities
covering at least 20% of the ground level area extending one mile or more
from a side exposure C has a train is a flat and
gently open extending 0.5 mile or more than this side any full quadrant
exposure D we present the most severe exposure areas with basic wind speed 80
miles per hour or more so exposure D is a severe condition it’s
a normal and it’s the minimum condition so you will select according to the the
type so it’s speed is wind speed is 1 0 5 so we have called to also see and that
our building is going to locate in which area
it’s a open terrain or there are lot of buildings so you can select accordingly
if you do not know select the C category then these are the factors okay and then
software automatically calculate the parameters you do not need in this
calculation or you can do by your own self so how software calculate my own I
will click ok so here I will just quickly draw the beams for example for
drying or beams here is the column I will just like all stories and I can
click one by one for the drying of columns now for the illustration of the wind
loads I will quickly draw a building now here is the column 300 by 300 here is I
have selected all stories when I click in the one story in the Australian
stories column automatically run for the quick way you can select by this way so
here I have drawn the columns quickly so now I will draw the slabs quickly how
air is a quick draw slab quick draw slab you will select the property slab 150
millimeter which is I have defined here here you can see slabs automatically
created in the old floors but at the bottom we do not need I will remove by
going there go into the plan base apply when I will go I will select only one
story if I select all stories click one all stories will be selected
automatically here but I do not want I just want to remove the bottoms they
story I will delete so here now the buildings are looking good the boundary
conditions are hinge I will assign it to pin one story I will select all the base
and a sine joint joint restraint is the boundary condition I will select fix
that will restrict all the deformations and rotations for hinge only deformation
is moments will not exist so I will select fix kind condition apply okay if
there is not just click here refresh now you can see boundary conditions are
applied so now I will assign the diaphragm here I will take first
diaphragm modify yes desert diaphragm is define what is desert and Samir
you can check it’s the flexibility of the your your slab I will select all
these labs tech properties slab section slab 150 millimeter okay so now I can
assign sorry shell diaphragms leave one apply okay so it is showing the
diaphragm extent I can disappear this type of extend by going here uncheck
this apply so here diaphragm extent is removed I have now I have assigned all
this latch need is a diaphragm now you can see the software automatically
applies to the wind load to the structure so here load pattern bin
modify modify here you can see the location will kept x coordinate y
ordinate then the second option is off when we can select the exposure from
shallow objects for that we have to create the cladding around the building
for example now I am going to create a cladding around the building I have
selected the 3d view and draw draw auto cladding use floors between the floors
automatically create thick reading use beams use columns so whatsoever the way
you like for example I have selected the use floors okay now you can check the
software automatically calculus I in the cladding to the building so the cladding
is that thing in the software which do not have mass and do not have stiffness
it only going to calculate the wind pressure to the beams columns and the
slabs so here I will select all the I will go into the a elevation a apply
okay I will select all the X sites 3d and assign shell loads and from here
wind coefficient so here for the windward pressure I will a point eight
for the windward when apply so here you can see in the inward 0.8 software
automatically calculates this value when we refresh and run the analysis we can
save these values here for the very loads for example now if I run the model
I can see the values okay this is the deformation model I
built for the wind response I will go in the extremum storage displacement due to
wind so here you can see the displacements x is blue which is showing
the extraction because we have applied the loading in the in the X direction
for the liebhard we will select the X negative side and apply the levered
pressure so here you can see the displacement X from displacement
appearing here now we will also see the Nords display load assignments – the
shells wind Lord apply so here you can see the parameters now 0.8 w 7.4 so pre
automatically calculates this these are the two ways for defining the lord for
the wind load pattern so here I have selected the second option so I have
taught both options it is up to you you can select the which option is better
for you thank you