Create a simple concrete beam and columns at etabs. Subject it to seismic loading. When you change the size of the columns bigger, the beams framing into it has bigger moments.. so oversize columns can introduce higher moments to the beams?
AELLC, of course the roof being lighter than lower floor means it has smaller moments in beams. You should have used example of floors just below the roof.
Also remember the displacement is distributed in each storey of the building so the shear is not really accumulative at lower floor. Any...
So the storey shear at second floor may be lower than the 10th floor yet the accumulated shear in the second floor is more than the 10th floor hence the columns and beams would attract more forces in the second floor?
Another thing. When I oversize the Columns at etabs. I noticed the beams...
https://courses.cit.cornell.edu/arch264/calculators/seismic-wind/index.html
but see above where shears is highest at top storey and lesser as you go down so how can you say otherwise?
Also when changing column sizes to larger ones, the beam moments increased so this means oversizing columns...
For oversized columns (where it is made larger than needed), can someone confirm that the beams framing into it indeed suffer greater moments during seismic activity?
In a building, the lower floors should have lower horizontal seismic storey forces acting compared to the upper floors from the base shear. But in Etabs, the beams have larger moment at ground floors than upper floors. How come?
How many percentage usually is the effect of these so called "Seismic Zone Factors" and "Soil Profile Types" on the overall strength of the say beams. Would there be as much as twice more flexural bars for example for soft soil versus rock...
cvg, there is a mistake in figure 1 in iriu.edu site, in "exclusively" P-wave, the house should move horizontal, not vertical. In "exclusively" S-wave, the house should move up and down, not horizontal, see animation of the wave motion at:
http://www.geo.mtu.edu/UPSeis/waves.html
In ubc, soil...
Interesting sites... but rock having larger shear wave velocity value means they have larger or smaller movement? But it is often said rock has better seismic resistance than soil. Why is that.
About this vertical component of the earthquake. Rock has bigger shear wave velocity value. And shear wave is vertical component of the earthquake. Does it mean in rock, the vertical component move so fast or has high frequency making the building vibration like oscillator? But they say rock has...
Periods don't just have to do with the rotational restraint of the foundations and flexibility of the columns but the dead load above which causes more inertia if the load is more. So in the 50kN-m beam in the house, the dead load above is just little since it's residential. In the mall with...
If you create very strong columns braced, then the beams don't have to be strong.
If you create average columns not braced, then the beams have to be strong to accommodate bending in the columns, joints and beams.
I think you will agree with the above?
So is this the sense that stiffness is...
Not a trick question. If the seismic load of the 300kN-m beam is larger.. and the seismic load or inertia from dead load of the 50kN-m beam smaller, then they would be similar in strength? Does any disagree with this?
Let's say there is a home and mall beside each other.
The home has typical short beam of 4 meters with let's say 50 Kn-m moment capacity at support while the mall has typical 10 meters span beam with say 300 Kn-m moment capacity at support. If the home has service load moment of 25 Kn-m and the...
The 10mm bar shims were removed because it's not in contact with the floor surface. In fact, the angle bar gap is really about 11mm. Windows and frames will be installed over it on Saturday. After I put the grout in the 11mm gap. Would the angle bar on top of it be in contact with it such that...
When the non-shrink grout hardened, would it be able to take the load of the accent? or is it just there to fill in spaces?
In the case of baseplates where it is supposed to take loads. How can this occur when the grout just fill in the spaces?
After discussion with installer, they said grout ok if sealant will be used since the grout part will be higher than the existing concrete and the angle bar is closed, only the end is open which would be sealed.
I purchased one bag of sika 212 from the retail shop. For those who have used this...
Yes they are the same object, the 3 pictures are taken of the bottom inside, top inside, and from the roof outside. Just imagine a rectangular accent sized 2.3 meters wide and 3 meters height.
In object like this. The natural thing is to have the concrete support the accent. But the installer...
This is the inside top details. The whole width of the accent is 2.3 meters wide by 3 meters height. The screws have 2" expansion bolts both in the inside top and outside (previous picture). They said it can carry the accent. But I want the accent to be carried at bottom too.
Can 10mm...
