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jrm2002 ...
Joined: 26 Jan 2003 Posts: 67
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Posted: Sat Dec 31, 2005 4:43 am Post subject: Tensile Strength Of Concrete:IS 456 and IS 1343-Mr. Kunal Ka |
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Dear Mr. Kansara:
Thanks for the reply.You asked me to try: "why principal tensile stress (and not rupture tensile stress) is specified in IS:1343 ",
In the concerned problem we are talking about failure in shear.Maximum shear occurs at the neutral axis and the bending stress is zero at the neutral axis.So if we take an element at the neutral axis it will be subjected to a state of pure shear and the principal planes for this state of stress are at 45 degrees inclined to the horizontal axis. Hence here we have to take the principal tensile stress into account .
But if we are considering failure due to bending, the element at the extreme will be subjected to bending alone(no shear stress) and the principal plane in such a case is a horizontal plane(0 degree inclination).Here, it is the flexural tensile stress that needs to be accounted for------still not able to answer your question--
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