Reduction factor for slenderness and eccentricity

(1) In the middle of the wall height, by using a simplification of the general principles given in 6.1.1, the reduction factor. Φ _m. taking into account the slenderness of the wall and the eccentricity of loading, for any modulus of elasticity E and characteristic compressive strength of unreinforced masonry f _k, may be estimated from:

where:

where:

and e _mk, h _ef, t and t _efare as defined in 6.1.2.2, and e is the base of natural logarithms

(2) For E- 1 000 f _k equations (G.3) becomes:

and for E = 700 f _k:

(3) The values of Φ _m derived from equation (G.5) and (G.6) are represented in graphical form in figure G. 1 and G.2

Figure G.l — Values of Φ _magainst slenderness ratio for different eccentricities,

based on an E of 1 000 f _k

Figure G.2 — Values of Φ _magainst slenderness ratio for different eccentricities,

based on an E of 700 f _k

Додаток H
(довідковий)

Коефіцієнт посилення згідно пункту 6.1.3

Рисунок H.1 — Графіки, що показують коефіцієнт зростання, даний у пункті 6.1.3:

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