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Differences between Working stress method and Limit state method
Design of RCC Structures
The design of the components of the RCC structure can be done in the following two ways:
1.Working Stress Method
2.Limit State Method


Working Stress Method
*.The Stresses in an element is obtained from the working loads and compared with permissible stresses.
*.The method follows linear stress-strain behaviour of both the materials.
*.Modular ratio can be used to determine allowable stresses.
*.Material capabilities are under estimated tolarge extent. Factor of safety are used in working stress method.
*.The member is considered as working stress.
*.Ultimate load carrying capacity cannot be predicted accurately.
*.The main drawback of this method is that it results in an uneconomical section.
Limit State Method
*.The 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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