Answer / bilal riaz chughtai

a limti state mehtod is a condition beyound which structure no longer fulfill the design criteria.
in working stress method it is assumed that plane section in bending will remain plane after bending.
stress strain relationships will obey hookx law.

Answer / rethina kumar

working stress method is classical method to design structure element. for ie:- if we design beam (r) any other element its reinforcement requirement will be more than actual requirement. 
in limit state method design will be based on factored load. reinforcement will be corresponding factored load. design section and Ast can use economically.

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