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When a structure is designed by working stress method, the maximum stress that is permitted to be experienced in elements, members or structures under nominal loading is called: 

When a structure is designed by working stress method, the maximum stress that is permitted to be experienced in elements, members or structures under nominal loading is called:  Correct Answer <span style="">permissible stress</span>

 Explanation:

  • Working Stress Method is based on the elastic theory and assumes that both steel and concrete and elastic and obey Hook’s law. It means that the stress is directly proportional to strain up to the point of collapse.
  • The basis of this method is that the permissible stresses are not exceeded anywhere in the structure when it is subjected to the worst combination of working loads.
  • In this method, the ultimate strength of concrete and yield strength or 0.2% proof stress of steel are divided by factors of safety to obtain permissible stresses. 
     

Type of Stress

Permissible values

Tensile or Compressive stress

0.6 fy

Bearing Stress

0.75 fy

Avg. Shear stress

0.4 fy

Stress in slab base

185 MPa for all types of steels

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