9. RESULTS

CHAPTER 9 "RESULTS" 35 Using the above form of the criterion one can conclude that: For < --> SUFFICIENCY For = --> MARGINAL ADEQUACY For > --> INDEPENDENCE An alternative form of the criterion ( FORM 2 ) is obtained if the following values are used in relation (1) instead of the main trends: ′ = (1) & ′ = 2 , ∗ ≥0 (2) 1 ∗ 2 ∗ with σ* acting as a safety factor so as to obtain a Boundary Capacity , ie: ∙ 2 + ∙ √ 2 + ∙ 1 − 1= 0 (3) 2 The solution of equation (3) with respect to σ* is done by testing as the relationship is braided. Using the above form of the criterion one can conclude that: For ∗ < --> SUFFICIENCY For ∗ = --> MARGINAL ADEQUACY For ∗ > --> INDEPENDENCE LIMITS OF APPLICATION OF THE MASONRY FAILURE CRITERION At first sight there are no restrictions on the choice of parameters b and f. The transformation of the equation from FORM 1 to FORM 2 is a one-point process so that a solution is obtained. However, there are cases where this is not possible. In particular, there are pairs b and f for which a negative discriminant may arise in equation (3b). The figure below shows in orange the zones with these inappropriate b and f pairs.