Correct Answer - Option 1 : corrosion and durability
Concept:
Definition of Limit state:,
According to IS 800:2007 clause 5.2, Limit states are the states beyond which the structure no longer satisfies the performance requirements specified. The limit states are classified
- Limit state of strength - Strength related factors
- Limit state of serviceability - Durability related factors
Limit state of strength:
The limit states of strength are those associated with failures (or imminent failure), under the action of probable and most unfavorable combination of loads on the structure using the appropriate partial safety factors, which may endanger the safety of life and property. The limit state of strength includes
- Loss of equilibrium of the structure as a whole or any of its parts or components
-
Loss of stability of the structure (including the effect of sway where appropriate and overturning) or any of its parts including supports and foundations
- Failure by excessive deformation, rupture of the structure or any of its parts or components
- Fracture due to fatigue
- Brittle fracture
Limit state of serviceability
- Deformation and deflections, which may adversely affect the appearance or effective use of the structure or may cause improper functioning of equipment or services or may cause damages to finishes and non-structural members
- Vibrations in the structure or any of its components causing discomfort to people, damages to the structure, its contents or which may limit its functional effectiveness. Special consideration shall be given to systems susceptible to vibration, such as large open floor areas free of partitions to ensure that such vibrations are acceptable for the intended use and occupancy
- Repairable damage or crack due to fatigue
- Corrosion, durability
- Fire
