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Help SAP2000 RCC design:Heavily Reinforced columns :(

 
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PujanG
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Joined: 30 Mar 2012
Posts: 11

PostPosted: Sat Apr 14, 2012 3:41 pm    Post subject: Help SAP2000 RCC design:Heavily Reinforced columns :( Reply with quote

Sir,

I'm new to SAP2000 and this is my first attempt to design a residential building in real.
I've done following steps:

1. Defined material
2. defined sections
3. Defined area section as Shell (thick)
3. modeled beam columns as line element & slab as area element
4. Defined load patterns>Dead, Live, Quake (earthquake load to be generated automatically as per IS1893 2002)
5. Assigned wall load directly on beams.
6. Assigned Floor finish load  & live load on area (uniform to frame)
7. Meshed area 6x6
8. Assigned Diaphragm constrains by selecting joints at each floor level.

Since one of the frames is not parallel to the principal axes, Dynamic analysis was required.
9. Defined a function "is1893" as the response spectrum
10. Assigned load case Response spectrum "ResX" in u1 direction & "ResY" in u2 direction using Modal Case & function "is1893"
11. Automatically generated load combination as per Design preference IS456.

The building is barely 3 storey yet the reinforcement i got after design is waaayyy higher than in practice.
I feel so helpless.

I've attached the model below.
Any help and suggestion is highly appreciated. Thank you



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model.zip
 Description:
Sap Model of residential building.
Staircase load yet to be taken into account.

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 Filename:  model.zip
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noentry
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Joined: 28 Oct 2011
Posts: 18

PostPosted: Thu Jun 21, 2012 6:03 pm    Post subject: try these Reply with quote

Hello PujanG

i see you model and i think you have almost made the model right and also the % of reinforcement are not very heavy (2% to 3%but better if managed below 2% for ease in construction work). i didnt check if this is M15 or M20 or other propt. still here are some comment according to my knowledge and according to how i am modeling. i don't say i am 100% right but i am saying what i think it should be like.

1. use "from load" option in Define- Mass Source

2. Define live load different for  floors and roof floors as the live load of roof floors doesn't take part in EQ force calculation.

3. why don't you select auto mesh in beam and column as well.

4. you should define partition load as 1kn/m2 in all working floors except roof floors.

5. remove the 9" wall load form roof floors and replace with parapet wall load.

etc check the model..... aren't there any cantilever slab or you have considers in load??


correct wherever i am wrong. comment of any expert are welcome here.
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PujanG
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Joined: 30 Mar 2012
Posts: 11

PostPosted: Fri Jun 22, 2012 2:04 am    Post subject: Reply with quote

Sagun Sir,

Thank you for your valuable response.


I'll surely incorporate your suggestions in the other models in future.
I'd also like to know form you regarding the reduction of live load.
As you know IS permits reduction of live load from upper storey for the design of column. Staad pro has this feature however i couldn't find it in SAP2000.

I've only heard of meshing of area element. I wonder how to mesh frames??!

I've looked into your posts in this forum & have seen lots of your involvement in building design using SAP2000.
I'm new to SAP2000 & still in doubt if these reinforcement information are in agreement to the reinforcement used in practice. so, i'd really appreciate if i could see one of your final models for residential purpose; which has been constructed & proven to work.

thank you again.
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noentry
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Joined: 28 Oct 2011
Posts: 18

PostPosted: Fri Jun 22, 2012 5:49 pm    Post subject: okey Reply with quote

Dear PunjanG

sap2000 will not reduced live load automatically unless we define reduced load in each floor. Sap2000 is FEM software it will not understand itself. But you can reduced live load.

About meshing you select all the frame and go to assign menu and select auto mesh .

The result from sap2000 are very realistic and can be used in practical life. But always result from sap2000 (computer) has to be once verified if it is practically acceptable. i mean to say we may make mistake while giving input to software. software understand only what we define in model.

what we have to do is analysis the building and review it.

find one attachment of my model which is in sap2000 14.2

Learning By Doing!!!



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Mrs. Anjana Chaulagai_V11_V12.rar
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PujanG
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Joined: 30 Mar 2012
Posts: 11

PostPosted: Sat Jun 23, 2012 8:24 am    Post subject: Reply with quote

Sir,
I am using sap2000 v14.0.0.0; i couldn't open the file.

could you please send s2k file instead. or save it using v14.0.0

thank u.
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