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Reason behind defining maximum strain in limit state design of RC structures instead of maximum stress

 
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aditya
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Joined: 05 Apr 2008
Posts: 167

PostPosted: Sun Jan 26, 2020 2:35 pm    Post subject: Reason behind defining maximum strain in limit state design of RC structures instead of maximum stress Reply with quote

Dear Sefians,
May I post a basic or elementary question in this forum:
Why is it that maximum strain is specified instead of maximum stress as a failure or limit state criteria in the design of RC structures in the codes?
with regards,
Aditya
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5364
Location: Gaithersburg, MD, U.S.A.

PostPosted: Tue Jan 28, 2020 9:42 pm    Post subject: Re: Reason behind defining maximum strain in limit state design of RC structures instead of maximum stress Reply with quote

Dear Er Aditya

I believe strain and deflections are the basic fundamental quantities that are experienced by the material and the structures. Stress and internal forces are derived from strain and deflections respectively.

Best wishes
NS
aditya wrote:
Dear Sefians,
May I post a basic or elementary question in this forum:
Why is it that maximum strain is specified instead of maximum stress as a failure or limit state criteria in the design of RC structures in the codes?
with regards,
Aditya
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View user's profile Send private message
aditya
...
...


Joined: 05 Apr 2008
Posts: 167

PostPosted: Wed Jan 29, 2020 1:45 pm    Post subject: Reply with quote

Dear Respected N S Subramanian Sir,
I would like to express my sincere gratitude for responding to my query. My observation is: In Working Stress Method (WSM) of design, we have been using the concept of permissible stresses for concrete and steel and no maximum strain values are directly defined whereas in LSM, the maximum strain values for concrete are defined in compression, bending, etc. Why has different approach been used in LSM vis-a-vis WSM?
with best regards,
Aditya
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5364
Location: Gaithersburg, MD, U.S.A.

PostPosted: Fri Jan 31, 2020 2:14 am    Post subject: Reply with quote

Dear Er Aditya
There is no need to think about maximum strain in WSM as we are considering only working loads.

In LSM we are considering the limit loads, that is loads which will fail the member. Hence the maximum stress and strain come into play.

Best wishes
Subramanian

aditya wrote:
Dear Respected N S Subramanian Sir,
I would like to express my sincere gratitude for responding to my query. My observation is: In Working Stress Method (WSM) of design, we have been using the concept of permissible stresses for concrete and steel and no maximum strain values are directly defined whereas in LSM, the maximum strain values for concrete are defined in compression, bending, etc. Why has different approach been used in LSM vis-a-vis WSM?
with best regards,
Aditya
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Ujjwal
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Joined: 07 Apr 2009
Posts: 6

PostPosted: Thu Feb 06, 2020 5:22 am    Post subject: Reply with quote

His question was "why
maximum strain is specified instead of maximum stress as a failure or limit state criteria"
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