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, Gable truss also at other gable

Horizontal bracing members

, Gable truss also at other gable

Horizontal bracing members

Determine the lateral force to be taken by the bracing truss at each gable end from the roof bracing members.

The vertical loading on the structure is:

Characteristic permanent loading 4.2 kN/m along the direction of each beam Characteristic variable loading 5.0 kN/m along the direction of each beam -

(medium-term action)

1. Roof beam geometric properties

Breadth of each beam, b

Depth of each beam, h

Beam spacing, Js

Span of each beam, I

Length of the building, Lb

Number of beams contributing to the loading, n (each end beam only contributing 50% of internal beam loading)

Number of bays in the beam span, ni

Laterally restrained length of the beam, lc

Section modulus of the beam about the y-y axis, Wy b = 155 mm h = 1200 mm Js = 4000 mm I = 19200 mm Lb = 52m

n1 b-h2

Glulam strength properties

Table 6.2 (BS EN 1194:1999, Table 1-GL 28h) Characteristic bending strength, fm.g.k fm.g.k = 28 N/mm2

Fifth-percentile modulus of elasticity parallel to the grain, E0.g.05

Fifth-percentile shear modulus

0 0

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