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[p_kadam]

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

[kalyan]

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
不是非常不同(通常智慧hin -15% and +25%).

Kalyanaraman

p_kadam_sefi@yahoo.co.in wrote:

[kalyan]

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
不是非常不同(通常智慧hin -15% and +25%).

Kalyanaraman

p_kadam_sefi@yahoo.co.in wrote:

[kalyan]

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
不是非常不同(通常智慧hin -15% and +25%).

Kalyanaraman

p_kadam_sefi@yahoo.co.in wrote: