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Load bearing Masonry building Design
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hishamajmalpc
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Joined: 09 Nov 2015
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PostPosted: Wed Jul 14, 2021 6:11 pm    Post subject: Load bearing Masonry building Design Reply with quote

Dear sefians,
Plz provide some practical oriented reference for design of load bearing masonry building. Also some sample structural drawings.

Regards,
Er. Hisham
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vikram.jeet
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PostPosted: Thu Jul 15, 2021 2:36 am    Post subject: Re: Load bearing Masonry building Design Reply with quote

Load bearing masonry building:
As a designer , not much difference while attempting design of masonry building :
FOUNDATIONS
Foundation in form of stepped footings of bwork with base concrete of pcc 1:4:8
Slab loads on supporting walls to be calculated in same way as on supporting beams.
Self weight of walls to be added
Any concentrated loads from beams to be considered dispersed at foundation level

MASONRY DESIGN
openings in masonry cause load concentration in the brickwork and to be checked for permissible stresses
Where large openings exist , provide RCC columns , or  thick brick piers.

Refer National Building Code of India  IS SP 7 , on masonry chapter , study
Calculate L/T or H/T of masonry wall whichever smaller

Eccentricity of loading for inner walls is generally zero , but for outer walls it is based on triangular bearing diagram , is ecc of loading for outer wall is T/2 - T/3 = T/6

Bricks are available in three classes
Class A Crushing strength  to be 105 kg/cm2  
Class B crushing strength to be 75 kg/cm2
These are suitable for buildings
Class 3 crushing strength. To be 45 Kg/cm2

Cement mortar classes
Cement : coarse sand mortar ratio
1:3,  1:4 ,  1:5 , 1:6

Based on above factors check the permissible stress in wall and compare with actual  Refer NBC

RCC beams shall be provided with bed blocks on orthogonal walls AND on same wall RCC beams are provided with higher bearing length i.e more than 230 mm to bring stresses within permitted range , little higher stresses are allowed by IS code just under bed blocks .

If reaction is high , provide RCC bed blocks otherwise pcc bed blocks.  Bed blocks are generally 150 mm to 230 mm thick and accordingly the bed block of pcc can be of length 530mm to 690mm considering 45 distribution .  Otherwise go for RCC bed block . Length requirement do not change but BB of rcc can be in less thickness.

I think IITK has given some solved , do not exactly remember, pl see net.

Best wishes


hishamajmalpc wrote:
Dear sefians,
Plz provide some practical oriented reference for design of load bearing masonry building. Also some sample structural drawings.

Regards,
Er. Hisham
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vikram.jeet
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PostPosted: Thu Jul 15, 2021 2:50 am    Post subject: Reply with quote

Masonry Building
A minimum of 230 mm wall is considered as load bearing
115 mm thick wall is partion wall not to carry gravity loads , but it can provide lateral stability to main walls , and also it can carry EQ forces if it is from bottom to top available . If it is provided on some floor and absent in next floor , it is infill.

115 thick walls  need to be CM 1:4.
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vikram.jeet
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PostPosted: Thu Jul 15, 2021 2:56 am    Post subject: Reply with quote

MASONRY BUILDING
In case Bearing capacity  of soil at founding level is low,  the  foundation widths are much higher and providing stepped brickwork requires huge brickwork volumes. In such cases it is wise to go for RCC strip footing running and wall of 460 mm stepped to 345mm can only be provided beneath GL to reduce brick work .
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hishamajmalpc
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PostPosted: Thu Jul 15, 2021 3:01 am    Post subject: Reply with quote

I am looking forward to design a G+2 masonry building as per clients requirement. Im trying masonry blng design for the first time. I dont know how a masonry design drawing sheet look like😄. I couldnt find any drawings so far for reference. It wll be hlpful if anyone can share a sample drawing for reference.

Regardz
Er. Hisham
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vikram.jeet
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PostPosted: Thu Jul 15, 2021 3:36 am    Post subject: Reply with quote

Dear Er Hisham

Please see Sheet 1 of SP 34  providing layout and details of a masonry building foundation plan with some columns at few locations.
These drawing sheets are available just at end of SP 34.
Best wishes

hishamajmalpc wrote:
I am looking forward to design a G+2 masonry building as per clients requirement. Im trying masonry blng design for the first time. I dont know how a masonry design drawing sheet look like. I couldnt find any drawings so far for reference. It wll be hlpful if anyone can share a sample drawing for reference.

Regardz
Er. Hisham
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vikram.jeet
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Joined: 26 Jan 2003
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PostPosted: Thu Jul 15, 2021 3:54 am    Post subject: Reply with quote

G+2 Masonry building

With introduction of few RCC columns along side openings , G+2 building can be easily constructed in masonry.

Where length of wall is more than 3 to 3.6 m , it is always better to provide RCC column or otherwise provide brick piers of 345 X 460mm or 230 X 460mm as the aesthetic permit.

The dispersion of load to be taken as :
In base pcc 1:4:8 concrete. - -  45
In brick offsets - -  1(h) : 2(v)

Foundation CM
Offsets from top of base conc to 460 thick offsets in CM 1:6
345 mm offsets  -  same as ground storey brick mortar
GROUND STOREY MORTAR  (Fish sorry)-   1:4 / 1:5  as per design
2nd storey mortar  - -  1:5 / :1:6 as per design
Top storey mortar - -  1:6

Just as a guide
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vikram.jeet
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PostPosted: Thu Jul 15, 2021 4:00 am    Post subject: Reply with quote

Foundation of 115 the walls  

These are partition walls . If their is continuity of these walls on all three floors or at least lower two floors, then it is better to provide small foundation on well compacted GL . But if it is mere partition , in one storey, it can be laid over some thickened plith concrete.
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PostPosted: Thu Jul 15, 2021 4:03 am    Post subject: Reply with quote

Minimum Foundation width of masonry walls

It shall head per NBC
Minimum with shall be 2T+300 mm

For 230 thick wall it shall be 760mm.
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PostPosted: Fri Jul 16, 2021 2:24 am    Post subject: Reply with quote

MASONRY STRUCTURES

Masonry structures are highly competent to resist horizontal forces due to EQ and Winds because of BOX FORMATION OF WALLS. Walls in their length direction are shear walls having very high MOI and competent enough . However for EQ in orthogonal direction , this strong wall in length dir , is weak and fully dependent on orthogonal walls .

Thus all those walls with large lengths without orthogonal walls , need to be provided with RCC columns to resist EQ in orthogonal dir.
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