Different between limit state and working stress method

Limit State Design Method is the latest approach in structural design which is based on not exceeding the limiting conditions of probable load and probable strength of materials through probabilistic approach.

Thus, the philosophy of limit state design method is to see that the structure remains fit for use throughout its designed life by remaining within the acceptable limit of safety and serviceability requitements based on the risk involved.

Different limit states for design Limit states are the states beyond which the structure no longer satisfies the specified performance requirements.

Different between limit state and working stress methos
Different between limit state and working stress method

The various limit states to be considered in design may be grouped into the following two major categories:

a) Limit state of strength

b) Limit state of serviceability

a) Limit state of strength:

The limit state prescribed to avoid collapse of structure which may endanger the safety of life and property are grouped nder this category. The limit state of strength includes: a)

i) Loss of equilibrium of whole or part of the structure.

ii) Loss of stability of structure as whole as part of it.

iii) Failure by excessive deformation.

iv) Fracture due to fatigue.

v) Brittle Fracture.

b) Limit state of serviceability:

The limit state of serviceability includes: ) Deformations and deflections adversely affecting the appearance effective use of structure are casing improper functioning of equipmem or services or causing damage to finishing.

i) Vibrations in structures or any part of its components limiting functional effectiveness.

ii) Repairable damage or crack due to fatigue:

iv) Corrosion

v) Fire.

I hope this article on “Different between limit state and working stress method” remains helpful for you.

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