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Query about Tata Structura steel mechanical properties

 
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sushant_goel
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PostPosted: Thu Oct 11, 2018 9:40 am    Post subject: Query about Tata Structura steel mechanical properties Reply with quote

Hello,
Please refer to the attached extract from Tata Structura steel brochure which states the mechanical properties of YST310. I have the following queries and would be glad if someone could share their knowledge with me.

1. Minimum yield stress (310MPa) and minimum UTS (450MPa) is clear. Why is the allowable axial stress in tension (186MPa), allowable bending stress in T or C (205 MPa), allowable shear stress (140MPa) and bearing stress (232MPa) less than the minimum yield stress value?

2. What is the difference between yield stress and equivalent stress?

3. Equivalent stress is given as 279 MPa. Is it correct to use the values given in point no. 1 in the formula "[(Axial stress)^2+3(Shear stress)^2]^0.5" to derive this value of 279 MPa?



Extract from Tata Structura_YST310.PNG
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Extract from Tata Structura_YST310.PNG



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Sushant Goel
MSc Uni Stuttgart
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sakumar79
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PostPosted: Thu Oct 11, 2018 2:47 pm    Post subject: Reply with quote

Dear Er Sushant Goel,
    With reference to your first query, please note that the allowable stress is probably worked out as per old IS 800 in working stress method (for tension, allowable stress is 0.6 fy, etc)

Yours sincerely
Arunkumar
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sushant_goel
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PostPosted: Fri Oct 12, 2018 8:09 am    Post subject: Reply with quote

Dear Arun Kumar,

Thanks for rightly pointing out that working stress method has been used to calculate the allowable axial stress in tension (0.60*310=186MPa). I was trying to figure it out using the limit state method.

Regards,
Sushant
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