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[SUNEIL]

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@www.buonovino.com)> wrote:

[cvrm]

Posted via Email

[cvrm]

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@www.buonovino.com]
Sent: Tuesday, December 04, 2012 9:50 AM
To:econf34289@www.buonovino.com
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

Posted via Email

[mrudulsoman]

Dear Sir,


1.1.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.
基本上有largevariation strorey僵硬ness 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:

a)Whichtime period formula shall be used for above mentioned case? (with or withoutinfills)

If formula with infills isto be used, then what width shall be considered? (That of podium or tower)

b)Isit necessary to provide separation joint between podium & tower?

2.2.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.

a)Aspectratio of brick panels

b)Provisionof transoms & mullions with rebars anchored in adjacent columns or beams

c)Qualityof bricks

Regards,

Jayant Kulkarni