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Question
Consider the following statements regarding the working stress design method:
1. Working stress design is based on the elastic theory.
2. The working stress in the member should be less than the permissible stress.
3. The permissible stress is the ratio of the factor of safety to the yield stress.
4. The permissible stresses for fasteners are usually based on the ultimate strength of the connection.
Which of the above statement(s) is/are not correct?
A.
1 and 3 only
B.
3 only
C.
4 only
D.
2 and 4 only
Answer ( Option B)

3 only

Solution

• Working stress design method (WSDM) is based on elastic theory.
• Attainment of initial yielding forms the design criteria for the members in this method.
• The working stress should be less than permissible stress.
• Permissible stress is defined as the ratio of yield stress to the factor of safety.
• The permissible stresses for fasteners are usually based on the ultimate strength of the connection using Factor of safety values of about 2 and 3 for various fasteners.
Note:
• When the yield point is well defined,
• Factor of safety (FOS) may also be defined as the ratio of strength of member to the expected force.

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