Working stress method of design is the old method which is replaced by the limit state design method now. It is still taught in the engineering studies, because it is important to understand the method, and some might also use this method.
In this method we take the design strength of the material as their yield strength. Further this strength is divided by a factor of safety to have a safer structure.
Generally the factor of safety for the concrete is almost equal to 3. So if you are using a M15 concrete then the design strength of the concrete in the bending compression for a RCC structure will be 5 N/sq.mm. M15 is not generally used for the construction of the RCC structures, generally M20 and M25 is used.
Design has two processes going side by side, one is analysis and other is the design. Structure is designed for the safety and economy at the same time, so we have to design the structural components by a number of trials until we get both economy and safety.
In this method we take the design strength of the material as their yield strength. Further this strength is divided by a factor of safety to have a safer structure.
Generally the factor of safety for the concrete is almost equal to 3. So if you are using a M15 concrete then the design strength of the concrete in the bending compression for a RCC structure will be 5 N/sq.mm. M15 is not generally used for the construction of the RCC structures, generally M20 and M25 is used.
Design has two processes going side by side, one is analysis and other is the design. Structure is designed for the safety and economy at the same time, so we have to design the structural components by a number of trials until we get both economy and safety.
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