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soft storey

 
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surendra
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 8
Location: Chennai

PostPosted: Thu Aug 19, 2004 2:28 pm    Post subject: soft storey Reply with quote

Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The building has four L-Shaped RC shear walls at four corners, central RC core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in ETABS)  shear walls are taking almost 95% of base shear and remaining by columns.

The ground floor of the building is like car parking/open storey, with columns and shear walls. But in all other floors (office building) outer walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls and foundation elements for soft storey condition or not as per 1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089



PS : Dr. Jain - Requested for your kind comments please

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sikandarsiddiqi
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...


Joined: 26 Jan 2003
Posts: 294

PostPosted: Thu Aug 19, 2004 5:51 pm    Post subject: soft storey Reply with quote

Dateline                                                   Radio Link International E - mail
Dhaka - Bangladesh/Asia



Dear Engr.Surendra, > Chennai/India

I have just received your e-mail.
Going through it technically.
E-mail me the Plan & Perspective view.
Wait for about two weeks for my technical design comments as there are some
basic regulatory seismic design mistakes in order to build this building 100%
earthquake resistant.

Wth regards.

Engr.Sikanfar Hayat Siddiqi
Project & Seismic Design Management Engineer
&
Builder/Developer Selection Consultant
&
Co-ordinator,Earthquake Anti-disaster Defence Management System Initiative












surendra@lntecc.com wrote:
Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The building has four L-Shaped RC shear walls at four corners, central RC core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in ETABS) shear walls are taking almost 95% of base shear and remaining by columns.

The ground floor of the building is like car parking/open storey, with columns and shear walls. But in all other floors (office building) outer walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls and foundation elements for soft storey condition or not as per 1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089



PS : Dr. Jain - Requested for your kind comments please











          
---------------------------------

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sdec.in
Silver Sponsor
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Joined: 26 Jan 2003
Posts: 473

PostPosted: Thu Aug 19, 2004 6:33 pm    Post subject: soft storey Reply with quote

This point was discussed by me in detail with Dr Sudhir Jain and C V R
Murty during the EQ seminar conducted by them at Delhi recently(The GOI
event) where it was clearly mentioned that these columns will be
designed for 2.5 times the final design moment due to the worst EQ
combination and we can do that by creating another combination of loads
applicable to column members of the soft storey only. This was confirmed
by me before applying it to Katra station building by us in our office
where certain blocks have been placed on stilts bcos of bus parking at
that floor.
Sangeeta Wij

-----Original Message-----
Message From  surendra@lntecc.com [mailto:surendra@lntecc.com]
Sent: Thursday, August 19, 2004 8:12 PM
To: sdec@bol.net.in
Subject: soft storey

Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The
building has four L-Shaped RC shear walls at four corners, central RC
core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from
foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in
ETABS)  shear walls are taking almost 95% of base shear and remaining by
columns.

The ground floor of the building is like car parking/open storey, with
columns and shear walls. But in all other floors (office building) outer
walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls
and foundation elements for soft storey condition or not as per
1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089



PS : Dr. Jain - Requested for your kind comments please

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skjain.iitk
General Sponsor
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Joined: 26 Jan 2003
Posts: 104

PostPosted: Fri Aug 20, 2004 11:28 am    Post subject: soft storey Reply with quote

I tend to think that the building under question should be treated
as a shear wall building and not as a frame building. Thus, the
ground storey is not really a soft storey, and hence, he need not
follow the IS:1893 provisions applicable for soft storey buildings
here.

I notice that the columns are supporting flat slabs and hence are
not part of the moment resisting frames. Thus, these are really
"gravity columns". Such columns would require special treatment
in terms of detailing. IS:13920 currently does not have such
provisions: hence, ACI318 provisions could be used by designer.
Alternatively, under IITK-GSDMA project we have suggested
such provisions to be incorporated in IS:13920 and these could
be useful.

Best regards,

Sudhir Jain


On Fri, 20 Aug 2004 sdec@bol.net.in wrote:

Quote:
This point was discussed by me in detail with Dr Sudhir Jain and C V R
Murty during the EQ seminar conducted by them at Delhi recently(The GOI
event) where it was clearly mentioned that these columns will be
designed for 2.5 times the final design moment due to the worst EQ
combination and we can do that by creating another combination of loads
applicable to column members of the soft storey only. This was confirmed
by me before applying it to Katra station building by us in our office
where certain blocks have been placed on stilts bcos of bus parking at
that floor.
Sangeeta Wij

-----Original Message-----
Message From  surendra@lntecc.com [mailto:surendra@lntecc.com]
Sent: Thursday, August 19, 2004 8:12 PM
To: sdec@bol.net.in
Subject: soft storey

Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The
building has four L-Shaped RC shear walls at four corners, central RC
core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from
foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in
ETABS)  shear walls are taking almost 95% of base shear and remaining by
columns.

The ground floor of the building is like car parking/open storey, with
columns and shear walls. But in all other floors (office building) outer
walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls
and foundation elements for soft storey condition or not as per
1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089



PS : Dr. Jain - Requested for your kind comments please



















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sikandarsiddiqi
...
...


Joined: 26 Jan 2003
Posts: 294

PostPosted: Fri Aug 20, 2004 3:00 pm    Post subject: soft storey Reply with quote

Dateline
Dhaka - Bangladesh/Asia                                  Radio Link International E-mai[


Dear Engr.Sangeeta, > India

My reply to Engr.Surendra is given below for your reference with a copy to Dr.Jain.

With regards.
Engr.Sikanfar Hayat Siddiqi
Project & Seismic Design Management Engineer
&
Builder/Developer Selection Consultant
&
Co-ordinator,Earthquake Anti-disaster Defence Management System Initiative


Dateline                                                   Radio Link International E - mail
Dhaka - Bangladesh/Asia



Dear Engr.Surendra, > Chennai/India

I have just received your e-mail.
Going through it technically.
E-mail me the Plan & Perspective view.
Wait for about two weeks for my technical design comments as there are some
basic regulatory seismic design mistakes in order to build this building 100%
earthquake resistant.

Wth regards.

Engr.Sikanfar Hayat Siddiqi
Project & Seismic Design Management Engineer
&
Builder/Developer Selection Consultant
&
Co-ordinator,Earthquake Anti-disaster Defence Management System Initiative



surendra@lntecc.com wrote:
Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The building has four L-Shaped RC shear walls at four corners, central RC core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in ETABS) shear walls are taking almost 95% of base shear and remaining by columns.

The ground floor of the building is like car parking/open storey, with columns and shear walls. But in all other floors (office building) outer walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls and foundation elements for soft storey condition or not as per 1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089



PS : Dr. Jain - Requested for your kind comments please






sdec@bol.net.in wrote:
This point was discussed by me in detail with Dr Sudhir Jain and C V R
Murty during the EQ seminar conducted by them at Delhi recently(The GOI
event) where it was clearly mentioned that these columns will be
designed for 2.5 times the final design moment due to the worst EQ
combination and we can do that by creating another combination of loads
applicable to column members of the soft storey only. This was confirmed
by me before applying it to Katra station building by us in our office
where certain blocks have been placed on stilts bcos of bus parking at
that floor.
Sangeeta Wij

-----Original Message-----
Message From  surendra@lntecc.com [mailto:surendra@lntecc.com]
Sent: Thursday, August 19, 2004 8:12 PM
To: sdec@bol.net.in
Subject: soft storey

Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The
building has four L-Shaped RC shear walls at four corners, central RC
core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from
foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in
ETABS) shear walls are taking almost 95% of base shear and remaining by
columns.

The ground floor of the building is like car parking/open storey, with
columns and shear walls. But in all other floors (office building) outer
walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls
and foundation elements for soft storey condition or not as per
1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089


PS : Dr. Jain - Requested for your kind comments please


< Structural Engineers Forum of India   >













          
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sikandarsiddiqi
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Joined: 26 Jan 2003
Posts: 294

PostPosted: Thu Aug 26, 2004 4:08 pm    Post subject: soft storey Reply with quote

Dateline                                                           Radio Link  International E-mail
Dhaka - Bangladesh/Asia




Dear Engr.Surendra,> Chennai/India

Refer to my e-mail in this respect.
You are advised not to proceed with the work till you review my report in this respect as there are some basic regulatory seismic design mistakes in order to build this building 100%
earthquake resistant.
It will be sent to you within a week.


With regards.


Engr.Sikandar Hayat Siddiqi
Project & Seismic Design Management Engineer
&
Builder/Developer Selection Consultant
&
Co-ordinator,Earthquake Anti-disaster Defence Management System Initiative



-----Original Message-----
Message From  surendra@lntecc.com [mailto:surendra@lntecc.com]
Sent: Thursday, August 19, 2004 8:12 PM
To: sikandarsiddiqi@yahoo.com
Subject: soft storey



surendra@lntecc.com wrote:




Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The
building has four L-Shaped RC shear walls at four corners, central RC
core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from
foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in
ETABS) shear walls are taking almost 95% of base shear and remaining by
columns.

The ground floor of the building is like car parking/open storey, with
columns and shear walls. But in all other floors (office building) outer
walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls
and foundation elements for soft storey condition or not as per
1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089


PS : Dr. Jain - Requested for your kind comments please






















          
---------------------------------

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Rudra Nevatia
...
...


Joined: 26 Jan 2003
Posts: 207
Location: Mumbai

PostPosted: Fri Aug 27, 2004 4:06 am    Post subject: soft storey Reply with quote

Dear Dr. Siddiqui,

Is it possible to make your report available to this forum?

Regards,
Rudra Nevatia

--- sikandarsiddiqi@yahoo.com wrote:

Quote:
Dateline                                                           Radio Link
International E-mail
Dhaka - Bangladesh/Asia




Dear Engr.Surendra,> Chennai/India

Refer to my e-mail in this respect.
You are advised not to proceed with the work till you review my report in
this respect as there are some basic regulatory seismic design mistakes in
order to build this building 100%
earthquake resistant.
It will be sent to you within a week.


With regards.


Engr.Sikandar Hayat Siddiqi
Project & Seismic Design Management Engineer
&
Builder/Developer Selection Consultant
&
Co-ordinator,Earthquake Anti-disaster Defence Management System Initiative



-----Original Message-----
Message From  surendra@lntecc.com [mailto:surendra@lntecc.com]
Sent: Thursday, August 19, 2004 8:12 PM
To: sikandarsiddiqi@yahoo.com
Subject: soft storey



surendra@lntecc.com wrote:




Dear friends,

We have analysed a 60x40m (approx) building with G+4 stories. The
building has four L-Shaped RC shear walls at four corners, central RC
core for lifts and other intermediate columns in between.

Please note that all columns and shear walls are continued from
foundation to roof level.

As per the analysis (shear walls and columns with flat slabs modelled in
ETABS) shear walls are taking almost 95% of base shear and remaining by
columns.

The ground floor of the building is like car parking/open storey, with
columns and shear walls. But in all other floors (office building) outer
walls are blockwork/glazing and Internal infill walls are not decided.

My question is whether i have to design ground floor columns, RC walls
and foundation elements for soft storey condition or not as per
1893-2002 ?



Please clarify

Thanking you,


SURENDRA BABU .J
Assistant Engineering Manager,
EDRC,
L&T - ECC,
Manapakkam,
Mount poonamalle high road,
Chennai - 600 089


PS : Dr. Jain - Requested for your kind comments please






















          
---------------------------------













          
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