STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

jrm2002 · ... Joined: 26 Jan 2003 Posts: 67

� �
It was mentioned by someone that if the column is stopped on the second floor provide diagonal members from its base to
adjacent columns at first floor level?

How would the behavior of the system be altered by the provision of diagonal braces?

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rsm · SEFI Regulars Joined: 26 Jan 2003 Posts: 25

Dear All:

Everybody is trying to give a diagnosis but nobody is telling the treatment.
Believe me floating columns/tranfer girder are here to stay. You have very
little control these days over these issues. If you can't design one just go
out of business. This seems to be the prevailing argument with developers,
architects.

现在让我们集中分析问题。th如何ese can be analysed and
designed.

Regards

Hemant K.

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nag1002 · Posted: Wed Dec 07, 2005 6:41 pmPost subject: floating columns

�
Dear Mr. Hemanth
The solution for the probem is only to make sure that you analyse the structure for all the parameters from
1.considering the floating column as point load on the beam,
2.考虑目前在联合btwn浮动column and the beam
3.consider the tortional forces due to biaxial bending in the column.

work out the indivisual and combination of above loading conditions and then design and detail the structure according to the worst combination of loads.

The point we are discussing here is that the behavior of this structure in the condition of lateral loads like the earthQuake and the heavy wind loads makes this floating column joint becomes the most vulnurable location for sudden failure. If the design and detailing has to be achived to entirely counter this effect the structure becomes very very uneconomical. The unpredictability of the occurance of earthquake and the experiance of the recent past that earthquakes occuring in area/region considered sesimicaly safe we are feeling that it is advisable not to adapt the same.

On Wed, 07 Dec 2005 rsm[AT]tou... wrote :
[quote]Dear All:

Everybody is trying to give a diagnosis but nobody is telling the treatment.
Believe me floating columns/tranfer girder are here to stay. You have very
little control these days over these issues. If you can't design one just go
out of business. This seems to be the prevailing argument with developers,
architects.

现在让我们集中分析问题。th如何ese can be analysed and
designed.

Regards

Hemant K.

Posted via Email

nag1002 · Posted: Wed Dec 07, 2005 7:11 pmPost subject: floating columns

Dear Mr. Hemanth
The solution for the probem is only to make sure that you analyse the structure for all the parameters from
1.considering the floating column as point load on the beam,
2.考虑目前在联合btwn浮动column and the beam
3.consider the tortional forces due to biaxial bending in the column.

work out the indivisual and combination of above loading conditions and then design and detail the structure according to the worst combination of loads.

The point we are discussing here is that the behavior of this structure in the condition of lateral loads like the earthQuake and the heavy wind loads makes this floating column joint becomes the most vulnurable location for sudden failure. If the design and detailing has to be achived to entirely counter this effect the structure becomes very very uneconomical. The unpredictability of the occurance of earthquake and the experiance of the recent past that earthquakes occuring in area/region considered sesimicaly safe we are feeling that it is advisable not to adapt the same.

other available methods like the concept of virendeel or prestressed members may be tried as a safer proposal than a floating column. With the attitude of our people negative toward hiring a good consultant it is safer to avoid a floating column than get into trouble later as the floating column is not a concept with out an alternative

Thank You

With regards

P. Nagesh

Nagesh Consultants
Bangalore -41�

On Wed, 07 Dec 2005 rsm[AT]tou... wrote :
[quote]Dear All:

Everybody is trying to give a diagnosis but nobody is telling the treatment.
Believe me floating columns/tranfer girder are here to stay. You have very
little control these days over these issues. If you can't design one just go
out of business. This seems to be the prevailing argument with developers,
architects.

现在让我们集中分析问题。th如何ese can be analysed and
designed.

Regards

Hemant K.

Posted via Email

rsm · SEFI Regulars Joined: 26 Jan 2003 Posts: 25

DearNAG1002@rediffmail.com:

You have missed the entire point. I don't think that the analysis you are
suggesting will take care of even the gravity load analysis. Floating column
analysis is non-linear. You must do a sequential construction analysis. It
is not that easy and simple as you have made it appear.

Hemanth Kr.

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p_kadam · General Sponsor Joined: 26 Jan 2003 Posts: 165

Dear all,

If we cosider it as a vertical member of braced or Virandeel system,entire vertical load will not get tranferred at its base.It will be distributed at all levels to adjacent columns thru such a system.

regards,

P Kadam

Message From rsm[AT]tou...

Date: Wednesday, December 7, 2005 3:02 pm

Subject: floating columns

Dear All:

Everybody is trying to give a diagnosis but nobody is telling the
treatment.
Believe me floating columns/tranfer girder are here to stay. You
have very
little control these days over these issues. If you can't design
one just go
out of business. This seems to be the prevailing argument with
developers,
architects.

现在让我们集中分析问题。th如何ese can be
analysed and
designed.

Regards

Hemant K.

Posted via Email