# Reliability Index¶

(1)¶

The generalised reliability index is defined as:

These indices are available:

the FORM reliability index, where is obtained with a FORM approximation (refer to ~): in this case, the generalised reliability index is equal to the Hasofer-Lindt reliability index , which is the distance of the design point from the origin of the standard space,

the SORM reliability index, where is obtained with a SORM approximation : Breitung, Hohen-Bichler or Tvedt (refer to ),

the generalised reliability index, where is obtained with another technique : Monte Carlo simulations, importance samplings,…

API:

See

`FORMResult`

See

`SORMResult`

Examples:

References:

Cornell, “A probability-based structural code,” Journal of the American Concrete Institute, 1969, 66(12), 974-985.

Ditlevsen, 1979, “Generalised Second moment reliability index,” Journal of Structural Mechanics, ASCE, Vol.7, pp. 453-472.

Ditlevsen and H.O. Madsen, 2004, “Structural reliability methods,” Department of mechanical engineering technical university of Denmark - Maritime engineering, internet publication.

Hasofer and Lind, 1974, “Exact and invariant second moment code format,” Journal of Engineering Mechanics Division, ASCE, Vol. 100, pp. 111-121.