7.2　Internal stiffening members

　

7.2.1　Section modulus

　

　

where

P_r is the applicable design pressure, kN/m²

l is the unsupported span, in metres;

s is the spacing of member, in metres;

σ_a is the design stress, (see Table 3), N/mm²

　

7.2.2　Moment of inertia

The moment of inertia for stiffening members, including the effective plating shall not be less than given by the following formula.

　

　

where

P_r is the respective design bottom pressure;

l is the unsupported span, in metres;

E_TC is the mean of compressive/tensile modulus of material, N/mm².

　

7.2.3　Proportions

Members with face bars:

maximum web depth to thickness 30 for FRP

45 for aluminium

60 for steel

Outstanding face bar to thickness and flat bar depth to thickness:

7 for FRP

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