The load bearing walls with stipulation of IS 4326 for earthquake buildings are successful even in earthquake conditions. So low rise structures should be constructed with masonry only. Even four storied structures can be constructed with this method. I have designed the building and it has stood all earthquake since 1995.
By
Amarjit Singh, Construction-Heavy, Pearls
| 12 22 2009 14:22:55 +0000
In Zone V RCC frame shall be preffred and or as suggested by Mr Mallay Pandravada traditional design adopted in Assam. Idea is theses are lightly loaded structures. Reasons he has given is defficeicy of aggregate in Assam. I have constructed many two storied houses load bearing in Assam, Nagaland and Manipur and higher ones in RCC frames. Only thing is Load bearing walls are to be suitably reinforced at corners and bands are to be provided at Plinth ,lintel and floor level. At floor level slab itself acts as a band.
By
Er. Harnam Singh, Project Manager, CPWD
| 06 24 2009 10:09:28 +0000
I agree and vote Er. Harnam Singh in this topic. My opinion is " I would like to prefer LBC better than RCC, as economical and finish the project with less durations compare to the RCC structures. But, LBC is not suitable for the Earth quake zones in INDIA.
By
PUGHALENDHI .R., planning engineer , PS CONSTRUCTIONS
| 06 23 2009 17:24:39 +0000
For a tropical country like India, Residential buildings, Educational institutions, Govt. offices etc should preferably be built with load bearing walls because of the inherent benefits. Load bearing walls provide good insulation from heat and keeps the inside cool. In extreme winters, they provide warmth inside. They are not only ecofriendly but also save energy. In RCC frame structures, use of 6 or 8 inch hollow blocks does not provide sufficient insulation. However, this presupposes that good quality bricks will be used in construction. In Assam, they use bamboo reinforced mud walls which are very safe in earthquake zones.
By
M.L.Suryaprakash , Regional Director, National Productivity Council
| 06 23 2009 11:18:50 +0000
Pragya, For every construction, we have to go for RCC framed structure over load bearing is not sounding properly. for earthquake prone areas and poor soil conditions, places where good quality bricks are not available, RCC framed construction is preffred. If we go case by case , where situations are favourable, we may even go for loadbearing construction also for low rise buildings provided it is properly designed for it. There are load bearing constructions standing since long time safely also. We may not close the options available.
By
Srinivas S.Mantrala, PMP, Executive Engineer, A.P.S.Police Housing Corporation
| 06 22 2009 08:40:30 +0000
Since Prgya's question was about the buildings in North eastern states I would like to elaborate. The constructions in NE states are differently constructed in eath quake prone areas .I served in Chabua Assam. First type are raised plinths using Masonry foundation and wooden frames are constructed (held to plinth by holding down bolts) with sloped roof above them.Half brick wall constructed upto window cill height and above panels are plastered with bamboo thatch as reinforcement. SECOND TYPE OF HOUSES UPTO G+2 CATEGORY These are invaribly load bearing type with bricks as prime buiding material with RCC bands at Plinth,lintel and roof level. Third TYPE OF HOUSES UPTO G+3 and above RCC framed structures are adopted. The problen for massive housing using RCC framed structure in Assam was Scarcely available stone aggreagate. Which was costly for the middle class people there.
By
Mallaya Pandravada, Project Leader/Managing Consultant, Sheladia Associates Inc
| 06 22 2009 08:28:02 +0000
Well Pargya you have misunderstood my reccomendation. What i have said is for Zone -III and below. Area you are reffering North east India and part of Gujrat are in ZOne V as per NBC classification. and definetly buildings in these zones are required to be earthquake resistant with special detailing as per IS codes.
By
Er. Harnam Singh, Project Manager, CPWD
| 06 22 2009 07:53:03 +0000
I agree with his view, for low rise structures up to (G+2). I read some where long back that in IIT Delhi, they constructed even 6 storied Load bearing structures for Staff Housing. (Pl.Correct me if I am wrong.) Where we can get good quality bricks / Blocks it is preferable to go for load bearing construcion keeping in view of the Future expansion needs in to consideration.
By
Srinivas S.Mantrala, PMP, Executive Engineer, A.P.S.Police Housing Corporation
| 06 21 2009 03:23:06 +0000
For low rise buildings, economy will be certainly a major factor to consider which may over ride structural factors like earth quake etc.. compared to framed structures, load bearing structure can be built at low expense in most of the cases (depends on soil condition and earth quake factors)
By
Shaju George, Facilities/Construction Manager, IBS Software Services (P) Ltd
| 06 20 2009 17:09:20 +0000
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Keeping in the future requirements and the non availability of quality bricks and non-availability of quality sand (in Hyderabad and adjoining areas, sand extracted from mud is predominantly available), RCC frame construction is better I believe. Ofcourse my knowledge in this area is so limited considering the expertise comments on the other side.
By
Srinivas suravajhala, Asst. Manager.
| 09 12 2011 11:48:41 +0000
It all depends on the requirements, As Mr. singh said it is cost effective and I have seen many houses constructed 50 years back still in good condition. due to the thickness of the walls it takes the load of the ceiling at the same time it is insulated from heat and cold. But When it comes to strength and elasticity there is no comparison for RCC. With the help of RCC we can build high rise structures.
By
B.Mehernath , Marketing & Technical Head, Bondit Construction Chemicals Pvt. Ltd.
| 06 24 2009 13:46:29 +0000
Generally RCC but not always. All the options available with a civil engineer, be it material, technique, design or construction technology are to be utilised based upon its "particular application". Prevalent practice, material availability, load to be carried, capacity of foundation etc etc etc may guide the selection. Such questions shall be asked with particular case in mind to make them more useful. Generalisation serves no purpose. ...and yes Latur was not caused because of LBS but because of non engineered buildings. The practice there was to not to use even mortar. Even Uttarkashi was cause due to non-engineered bulildings and incapable foundations.
By
Vivek Singh, Project Manager, L&T
| 06 24 2009 12:49:57 +0000
Well i must say that brick available in class 75 designation bricks cataogory definely have strength 75 kg/sqcm and more . STrength up to 100kg/sqcm have witnessed personally by me at many sites. These bricks are used for filler walls also.
By
Er. Harnam Singh, Project Manager, CPWD
| 06 22 2009 07:55:42 +0000
Mr. singh, no matter the calculations you gave for load bearing construction will make a fairly good and strong building. But how far do you think it can bear the earthquake current in freaquently earthquake areas like states of North east india and many places near Gujrat. How far do you think it will be as successful as an RCC frame constructed building?
By
Pragya Kothari, Construction-Heavy, DLF
| 06 22 2009 06:19:07 +0000
As far as safety is concerened we should not make compromise and go for RCC frame Construction Provided Bearing capacity is low and area falls in EQ Zone 4 and above. If bearing capacity is good 8-10 t/sqm we can economically and sucessafully use load bearing construction up to 4 storey construction with bricks having strength 75kg/cm2. Ductilty measres for EQ resistsnt construction can also be taken in case of load bearing construction by providing corner reinforcement and plinth and lintel bands.
By
Er. Harnam Singh, Project Manager, CPWD
| 06 21 2009 16:53:01 +0000
I am on this column simply because I think it is too simplistic to opine that load bearing walls should be the preferred building method for low rise buildings. Have we all forgotten Laatur? Haven't we learnt anything from that disaster? The construction preference should always be based first on human safety then anything else. For earthquake prone areas and for areas with soft soil, framed construction is preferred, because it gives more ductility to the structure. In 1980s, I had proved to then CMDA that RCC strip foundations are more economical than traditional stepped brick foundations for load bearing walls on soft soils and perform much better against differential settlements and in arresting cracks in walls in places like Salt Lake in Kolkata where the SBC is of the order of 5T/sq.m. All the buildings (4 storeyed) we designed with strip footings, RCC framework and brick infill walls performed far better than those designed by others with load bearing walls and / or isolated column footings in terms of even settlements and avoidance of cracks in walls.
By
Basab Ghosh, General Manager (Operations), Saipem India Project Ltd.
| 06 21 2009 09:31:01 +0000
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