mufutau55:


You sure you are really building in Nigeria? Use trees as a form of fence for your building? I think not o.

Hajji M.

MODALSOUL1:
you could create extra rooms in the roof space (Attic)

EgunMogaji:

Ti awon boys ba de

Rubbiish:

@First pic, the cantilever no be here ooo
Can our Nigerian engineers pull such off...I seriously doubt...

EgunMogaji:


Well, every homeowner with his own taste.

My two car garage has been called wasteful because it can be a studio apartment.

Oga Spyder880 just wants his roof to be seen from the next village

bixton:


Architect who pulls up such design should be able to get a Structural Engineer who will put up the structural aspect.

So it is not beyond the limits of the Nigerian Engineer. It is only beyond the limits of the individual thinker.

Aventures:
Sir, I disagree with your last statement. Raft can sit comfortably on imported soil. There are some cases where the soil test report can recommend soil improvement and then shallow foundation instead of pile. Now, soil improvement is a process whereby you remove the natural top soil, vegetations, peat to a recommended level then fill and make the site up with a recommended imported filling material, you will either wait for natural compaction or make use of a vibratory axial roller with a recommended tonnage to compact and the do your compaction test. Thereafter your raft can be built. (I refer u to my thread on Osapa London project) Also this is the process required for cellular raft and reinforced concrete road. At the least I have dine this for a 2 storey building and 2 reinforced concrete roads.

bixton:


Architect who pulls up such design should be able to get a Structural Engineer who will put up the structural aspect.

So it is not beyond the limits of the Nigerian Engineer. It is only beyond the limits of the individual thinker.

EgunMogaji:


I'm certain that Skimanski can do this.

www.nairaland.com/attachments/6698908_santanderhouse01_jpegaf0fd7c894e2aaf85ab6164296124860

MODALSOUL1:
I see pics of Nigerians homes with big roofs and i wonder what a waste. You could create extra 4 bedrooms or even a game room or library at the roof . having rooms in the roof is french design .It's called an Attic . although I prefer the modern style

EgunMogaji:


Well, every homeowner with his own taste.

My two car garage has been called wasteful because it can be a studio apartment.

Oga Spyder880 just wants his roof to be seen from the next village

skimanski:



Na igbo men type of style be thAt wey dem go point to their roof to show you the location of their house

MODALSOUL1:
I Prefer modern/contemporary architecture with large windows,mostly cubic or square shaped . 3 storey with the roof top (Attic) being livable.

Rubbiish:

Hmmmm....i doubt ooo
I am not even talkng about the extension of the cantilever, but the load on top of the extention.
It is really gonna be difficult for our engrs, this is like a younger brother to cantilever helipad..

Androidking:


Let me come here so let's say a building has a cantilever . now that cantilever has a beam .
Now the column on d which d cantilever is on, is may be 525 x 225 mm .

Even if the cantilever is long . must d column project out ?? As in, part it in d wall part of it kicking out?? For d longer side

D reason for this is places like Aba and Onitsha they always do that no matter what d architect design dey keep pushing columns out and tell u, its for it to carry the cantilever . even if its 6 floors,
can't a structural ENGR design a building without those columns shouting of the wall .?

Pls am just a beginner and I hate it when engrs change my elevations .


Look at pix below u will see d columns projecting even d beams . does it mean its cheaper that way or dey are afraid to power a cantilever without those columns kicking out..

Or will it more expensive to do so??


Even in Two storey they still do it . as far as its blocks of flats u will it at Aba and Onitsha .

Pls no mind my repetition of sentences. I just want to learn

Like it when everything if flushing smoothly

spyder880:


I don't see anything too difficult about that cantilever, look at the top of it, did you notice how it is reduced to draw back some weight?

Rubbiish:

True sir...
But the extension at the base & the wall on top of it rose my observation.
Most cantilevers we build here in nigeria extending more than 1.2m solely serve as balcony & not loaded with walls like i saw in that pic.

spyder880:


Or they come with serious "wedge" which some of us find so ugly

Rubbiish:

Hmmmm....i doubt ooo
I am not even talkng about the extension of the cantilever, but the load on top of the extention.
It is really gonna be difficult for our engrs, this is like a younger brother to cantilever helipad..

skimanski:


Chairman Ah Ah!! give us some credit ooo. The only thing I see about this building is the genius thinking in its the architecture.

Do you know that the Extension is Most likely not carrying any more than 40% of the Load and is also most like the 40% its carrying is still getting support from the Top ?

ice4u999:


Aventures, for accuracy, how long is a soil test really good for? Can one use a result from a soil test done 2-3 years ago?
My other question is, do I need to know the type of structure I want to erect before carry out a soil test or the test can be done and then give my structural engineer whenever I am ready?
Sometimes ago I was studying in failed foundation repair, underpinning and the likes, I did a pile for an international trained petroleum drilling engineer and he gave a lot of journals and books to read. Along the line I discovered that one of the reason for foundation failure is not just a design error or construction issues, it could be a change in soil formation over a very long time. Just to buttress this point some few years back an NLder introduced me to a client in Gbagada for a structural integrity inspection of a house he bought, the house was built years back on a pad foundation, after about 30yrs it is now showing some fatigue, after investigation the house is to be pulled down because the formation underneath has changed and can no longer bear the load with pad fdn.
Back to tour question 2-3yrs not too long for a soil test in my own opinion, but if your structural engineer is not comfortable with it, I all advice you do a fresh one that he would coordinate and ensure it is properly done.

Androidking:


Let me come here so let's say a building has a cantilever . now that cantilever has a beam .
Now the column on d which d cantilever is on, is may be 525 x 225 mm .

Even if the cantilever is long . must d column project out ?? As in, part it in d wall part of it kicking out?? For d longer side

D reason for this is places like Aba and Onitsha they always do that no matter what d architect design dey keep pushing columns out and tell u, its for it to carry the cantilever . even if its 6 floors,
can't a structural ENGR design a building without those columns shouting of the wall .?

Pls am just a beginner and I hate it when engrs change my elevations .




Look at pix below u will see d columns projecting even d beams . does it mean its cheaper that way or dey are afraid to power a cantilever without those columns kicking out..

Or will it more expensive to do so??


Even in Two storey they still do it . as far as its blocks of flats u will it at Aba and Onitsha .

Pls no mind my repetition of sentences. I just want to learn

Like it when everything if flushing smoothly

abdulwastecx:


I think the problem is most of these building don't have structural design and if they do, the designs are not properly done.
Before I can answer your question, I will like to define and differentiate some terms that are interchangeably used from a structuring engineering point
cantilever slab: when the slab of a building or other structural member shootout from a beam perpendicular to the length width of the adjacent beam (a layman definition)
Overhanging slab: when a part of the slab is hanging out from an inner slab, where the two slab share the same beam at a point
cantilever beam: look up to the cantilevered slab above
Overhanging beam: look up to the overhanging slab above.

the major reasons while most of the building cantilever or overhung have such load is the presence of loaded slab at the edge which exacts too much point load, thereby increasing the moment and share at such end. The better arrangement is to have the slab cantilevered out without a column on top, where the slab will carry only the wall load of one floor.
If there is a need to have a wider slab, The slab can be accompanied by a beam which can be concealed ( raft or waffle slab) or shoot out below.
From experience, the best approach is to have an overhanging beam that extended into the slab thereby neutralizing the effect bending moment on the beams and columns

MODALSOUL1:
Attic can be insulated . stop giving excuses man . Summer may be hotter than Nigeria but there's Attic

mufutau55:

Give excuse? Will I tell or stop you not to put attic in your build? I am telling you how it is in Nigeria, sorry to even commented.
Hajji M.

skimanski:



Also the clients should bring the design too. Let’s even start from there. Because non of my clients have agreed on a design with such a cantilever.

Anyway I Dey wait for @Egunmogaji . I believe say me and my Oga go do this kind of building together one day.

MODALSOUL1:
I created this house plan . it's a Three storey 15 Bedroom House. All rooms will have bathroom . The house will have a game room and Library, Office. This is the first floor .


The red markings signifies doors attacged to the entry way. the entrances without red marking signifies no door in entry way

Flaghouse1:


Eku Laakai Sir,

Well dissected , my question on this cantilever discourse to you sir are.

1.what is the relationship between the quantity of iron rods used in cantilever and decking in terms of sizes of iron rod.

2.-What is the ideal length of a cantilever shoot out from the decking in terms of feels or metres

Thank you