Answer Posted / anjali

• In working stress,Stresses in an element is
obtained from the working loads and compared with
permissible stresses.The method follows linear stress-
strain behavior of both the materials.Material capabilities
are under estimated to large extent.moreover Ultimate load
carrying capacity cannot be predicted accurately.
• Whereas in limit state method, stresses are
obtained from design loads and compared with design
strength.In this method, it follows linear strain
relationship but not linear stress relationship (one of the
major difference between the two methods of design).The
ultimate stresses of materials itself are used as allowable
stresses.The material capabilities are not under estimated
as much as they are in working stress method. Partial
safety factors are used in limit state method.

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