Explain the statement 'Limit state method combines best of working stress method and ultimate load theory.'

Civil Eng > Sem 8 > Design and Drawing of Reinforced Concrete structure

ddrcs mumbai university • 1.1k  views
  • The philosophy of the limit state method of design represents a definite advancement over the traditional design philosophies.
  • Unlike WSM which based calculations on service load conditions alone, and unlike ULM, which based calculations on ultimate load conditions alone, LSM aims for a comprehensive and rational solution to the design problem, by considering safety at ultimate loads and serviceability at working loads.
  • The LSM philosophy uses a multiple safety factor format which attempts to provide adequate safety at ultimate loads as well as adequate serviceability at service loads, by considering all possible 'Limit State'.

Limits States

A limit state is a state of impending failure, beyond which a structure ceases to perform its intended function satisfactorily; in terms of either safety of serviceability i.e. it either collapses or becomes unserviceable.

There are two types of limit states:

Ultimate limit states (limit states of collapse):- Which deal with strength, overturning, sliding, buckling, fatigue fracture etc.

Serviceability limit states: - Which deals with discomfort to occupancy and or malfunction, caused by excessive deflection, crack width, vibration leakage etc., and also loss of durability etc.

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