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(sefi)WSM in IS 800

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2003
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p_kadam
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Joined: 26 Jan 2003
Posts: 165

PostPosted: Thu Nov 20, 2003 3:38 am    Post subject: (sefi)WSM in IS 800 Reply with quote

Dear friends,
Congrats to codemakers of new IS 800 for bringing out a very good code & successfully defending the same.
WSM is proposed to be retained for a while till limit state approach is digested.
Is it a truth or myth that WSM is more conservative?
Does WSM recognise permissible statistical variations in working loads & permissible stresses?If no,should WSM be allowed without a penalty?
regards,
P Kadam

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kalyan
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 7

PostPosted: Mon Nov 24, 2003 4:53 am    Post subject: (sefi)WSM in IS 800 Reply with quote

Reply:

In the limit states code the partial safety factors are calibrated such
that the designs based on the limit states method are essentially the
same as that from working stress method.  Hence, just by designing based
on the limit states method alone one is not likely to obtain any greater
economy.  However the limit states method would allow plastic and other
analysis method through which some economic benefit may accrue.  
Further, the improvements in design provisions in the new draft code
based on latest State of the art could result in some ecomony.  Finally
in a few situation the existing code was unconservative,  and the new
code has corrected it, because of which new designs based on limit
states method may be heavier.  However, the limit states method proposed
is most rational and will help to improve the partial safety factors in
a rational way as the technology improves.

We have also carried out comparison studies of strength of different
type of members based on the existing and new codes and find the results
are not very different (normally within -15% and +25%).

Kalyanaraman

p_kadam_sefi@yahoo.co.in wrote:

Quote:
Dear friends,
Congrats to codemakers of new IS 800 for bringing out a very good code & successfully defending the same.
WSM is proposed to be retained for a while till limit state approach is digested.
Is it a truth or myth that WSM is more conservative?
Does WSM recognise permissible statistical variations in working loads & permissible stresses?If no,should WSM be allowed without a penalty?
regards,
P Kadam










Posted via Email
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View user's profile Send private message
kalyan
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 7

PostPosted: Mon Nov 24, 2003 4:53 am    Post subject: (sefi)WSM in IS 800 Reply with quote

Reply:

In the limit states code the partial safety factors are calibrated such
that the designs based on the limit states method are essentially the
same as that from working stress method.  Hence, just by designing based
on the limit states method alone one is not likely to obtain any greater
economy.  However the limit states method would allow plastic and other
analysis method through which some economic benefit may accrue.  
Further, the improvements in design provisions in the new draft code
based on latest State of the art could result in some ecomony.  Finally
in a few situation the existing code was unconservative,  and the new
code has corrected it, because of which new designs based on limit
states method may be heavier.  However, the limit states method proposed
is most rational and will help to improve the partial safety factors in
a rational way as the technology improves.

We have also carried out comparison studies of strength of different
type of members based on the existing and new codes and find the results
are not very different (normally within -15% and +25%).

Kalyanaraman

p_kadam_sefi@yahoo.co.in wrote:

Quote:
Dear friends,
Congrats to codemakers of new IS 800 for bringing out a very good code & successfully defending the same.
WSM is proposed to be retained for a while till limit state approach is digested.
Is it a truth or myth that WSM is more conservative?
Does WSM recognise permissible statistical variations in working loads & permissible stresses?If no,should WSM be allowed without a penalty?
regards,
P Kadam










Posted via Email
Back to top
View user's profile Send private message
kalyan
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 7

PostPosted: Mon Nov 24, 2003 4:53 am    Post subject: (sefi)WSM in IS 800 Reply with quote

Reply:

In the limit states code the partial safety factors are calibrated such
that the designs based on the limit states method are essentially the
same as that from working stress method.  Hence, just by designing based
on the limit states method alone one is not likely to obtain any greater
economy.  However the limit states method would allow plastic and other
analysis method through which some economic benefit may accrue.  
Further, the improvements in design provisions in the new draft code
based on latest State of the art could result in some ecomony.  Finally
in a few situation the existing code was unconservative,  and the new
code has corrected it, because of which new designs based on limit
states method may be heavier.  However, the limit states method proposed
is most rational and will help to improve the partial safety factors in
a rational way as the technology improves.

We have also carried out comparison studies of strength of different
type of members based on the existing and new codes and find the results
are not very different (normally within -15% and +25%).

Kalyanaraman

p_kadam_sefi@yahoo.co.in wrote:

Quote:
Dear friends,
Congrats to codemakers of new IS 800 for bringing out a very good code & successfully defending the same.
WSM is proposed to be retained for a while till limit state approach is digested.
Is it a truth or myth that WSM is more conservative?
Does WSM recognise permissible statistical variations in working loads & permissible stresses?If no,should WSM be allowed without a penalty?
regards,
P Kadam










Posted via Email
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View user's profile Send private message
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