Answer / a.mohamed buhari musa, sankar

In working stress method we are designing the structure for
the load acting on the structure.
In limit state method we are designing for the limit state of
safety and serviceability by applying partial safety factor
partly for the load or moment and partly for the stress
induced in the structure.

I don't know surely this is correct or not.

Answer / mohan rathish

in limit state load is overesimate than actual,so we can
assure more reliable.safe than wsm. hence we can obtain
suitable section which is stronger than wsm. it is verry
common. wsm only suitable for chimney, water tank ....etc

Answer / karthick.k

In case of design procedure , the facted load can be taken
for limit state mtd, by working stress method axial load
can be taken and strength of material is low, by limit
state method strength of material is high.

Answer / dharma raj pant

limit state is non deterministic i.e. parameters are not
known initially whereas WSM is deterministic

Answer / ghantola

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 to large 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.

Answer / guest

factor of safety

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