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AS 3700 - Masonry Wall

Reinforced masonry is verified for load due to bending moment, shear force and combination of compressive normal force and bending moment. When load due normal force is considered, it is necessary to specify also the slenderness ratio Sr.

Design for members in compression and bending

where:

Fd

-

the design compression force acting on the cross-section

ϕ

-

the capacity reduction factor - 0.75

ks

-

a reduction factor taken as 1.18 - 0.03*Sr but not greater than 1.0

f'uc

-

the characteristic uncofined compressive strength of masonry

f'm

-

the characteristic compressive strength of masonry

Ab

-

the bedded area of the masonry cross-section

fsy

-

the design yield strength of reinforcement

As

-

the total cross-sectional area of main reinforcement

Design for members in bending

where:

Md

-

the design bending moment acting on the cross-section of member

ϕ

-

the capacity reduction factor - 0.75

fsy

-

the design yield strength of reinforcement

Asd

-

the portion of the cross-sectional area of the main tensile reinforcement used for design purposes in a reinforced masonry member

the lesser of and Ast

f'm

-

the characteristic compressive strength of masonry

d

-

the effective depth of the reinforced masonry member

fuc

-

the characteristic uncofined compressive strength of masonry

Out-of-plane shear in wall

A reinforced wall subject to out-of-plane shear shall be such that:

but not more than:

where:

Vd

-

the design shear force acting on the cross-section of the masonry wall

ϕ

-

the capacity reduction factor - 0.75

f'vm

-

the characteristic shear strength of reinforced masonry - 0.35 Mpa

d

-

the effective depth of the reinforced masonry wall

fvs

-

the design shear strength of main reinforcement - 17.5 Mpa

fsy

-

the design yield strength of reinforcement

Ast

-

the cross-sectional area of fully anchored longitudinal reinforcement in the tension zone of the cross-section