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Soft Storey effect
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SUNEIL
SEFI Member
SEFI Member


Joined: 20 May 2009
Posts: 6
Location: India

PostPosted: Tue Dec 04, 2012 4:42 am    Post subject: Soft Storey effect Reply with quote

I think accomodation of shear walls in the upperstory walls as you mention , is possible.We have designed such a high rise residential building with shear walls that never hindered in functional planning of the residence.Planning of the building with shear wall +column system in mind in advance may solve the issue. suneil mehta
ALWAYS BE POSITIVE !!!!


On Tue, Dec 4, 2012 at 9:35 AM, Manoharbs_eq <forum@sefindia.org (forum@sefindia.org)> wrote:
Quote:
           Dear Murthy sir,

It is evident that soft storey at lower level is not a good structural system to adopt that we have learnt from past failures. But Architect never bother to change anything and we are forced to design to their need. so soft storey is unavoidable.

The only solution left is to drop down the shear walls to accompany and increase the stiffness. In a commercial building this doesnt pose much a problem but residential buildings its always a problem to handle since upper floors generally have walls.


Rgds
Manohar
     



     


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cvrm
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Joined: 16 Nov 2012
Posts: 12
Location: Chennai

PostPosted: Tue Dec 04, 2012 5:30 am    Post subject: Soft Storey effect Reply with quote

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cvrm
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Joined: 16 Nov 2012
Posts: 12
Location: Chennai

PostPosted: Tue Dec 04, 2012 6:17 am    Post subject: Soft Storey effect Reply with quote

Dear Mr. Manohar:

Undesirable professional practices being adopted in India for low rise buildings cannot be acceptable for Tall Buildings also... But, when an engineer becomes subservient to the architect and delivers what an architect wants in a low rise building, the engineer should be careful that he does not compromise safety of the people and the building. The large number of open ground storey buildings in India with about one-tenth the stiffness and about one-half the strength in the ground storey compared to that in the upper storeys is a testimony to this gross compromise being made by the engineers on the earthquake safety of people of India...

So, if "Architect never bother" of the safety, engineer has to...

On the issue of using structural walls in buildings, if it is not a problem for commercial buildings, then it does not seem to be a problem for residential buildings also. The RC walls have to go full height of the building. The URM infills in select bays in the upper storeys can be replaced with the RC walls; and, windows can be provided in the RC walls too.

with warm regards...
C.V.R.Murty
..


________________________________________
From: Manoharbs_eq [forum@sefindia.org]
Sent: Tuesday, December 04, 2012 9:50 AM
To: econf34289@sefindia.org
Subject: [E-CONF] Re: Soft Storey effect

Dear Murthy sir,

It is evident that soft storey at lower level is not a good structural system to adopt that we have learnt from past failures. But Architect never bother to change anything and we are forced to design to their need. so soft storey is unavoidable.

The only solution left is to drop down the shear walls to accompany and increase the stiffness. In a commercial building this doesnt pose much a problem but residential buildings its always a problem to handle since upper floors generally have walls.


Rgds
Manohar

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mrudulsoman
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 2

PostPosted: Tue Dec 04, 2012 8:42 am    Post subject: Reply with quote

Dear Sir,<o:p></o:p>
<o:p> </o:p>
<o:p> </o:p>
<!--[if !supportLists]-->1.      1.       <!--[endif]-->Analysis of plaza bldg. having podium &tower coming above the          same.
         Here is the case where podium isof size 90 m x 50 m with 5               levels for parking & 19 storeyed towers 3 nosisolated from each         other. The structural system is slabbeam system.
            Basically there is largevariation in strorey stiffness between               podium floors (without infills) andtower floors (with Brick infills).         Even after doing modal analysis for findingbase shear, for further       enhancement of base shear as per clause no 7.8.2 ofIS 1893.
            We have following questions to bediscussed:
<o:p></o:p>

<!--[if !supportLists]-->a)      <!--[endif]-->Whichtime period formula shall be used for above mentioned case? (with or withoutinfills)<o:p></o:p>

If formula with infills isto be used, then what width shall be considered? (That of podium or tower)<o:p></o:p>

<!--[if !supportLists]-->b)      <!--[endif]-->Isit necessary to provide separation joint between podium & tower?<o:p></o:p>


<o:p> </o:p>
<o:p> </o:p>
<!--[if !supportLists]-->2.       2.      <!--[endif]-->In order to use the empirical formula withinfills for calculation of         Time period (Clause no 7.6 of IS 1893) , what isthe criteria for        deciding whether stiffness of brick infills to be consideredin                analysis or not, i.e.<o:p></o:p>
<!--[if !supportLists]-->a)      <!--[endif]-->Aspectratio of brick panels<o:p></o:p>

<!--[if !supportLists]-->b)      <!--[endif]-->Provisionof transoms & mullions with rebars anchored in adjacent columns or beams<o:p></o:p>

<!--[if !supportLists]-->c)       <!--[endif]-->Qualityof bricks<o:p></o:p>


<o:p> </o:p>
<o:p> </o:p>
<o:p> </o:p>
Regards,<o:p></o:p>
<o:p> </o:p>
Jayant Kulkarni<o:p></o:p>
<o:p> </o:p>
<o:p> </o:p>
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