Composite Beams ~ stock sizes of structural softwood have
sectional limitations of about 225 mm and corresponding span
potential in the region of 6 m. At this distance, even modest
loadings could interpose with the maximum recommended deflection
of 0„003 ¾ span.
Fabricated softwood box, lattice and plywood beams are an
economic consideration for medium spans. They are produced with
adequate depth to resist deflection and with sufficient strength for
spans into double figures. The high strength to weight ratio and
simple construction provides advantages in many situations
otherwise associated with steel or reinforced concrete, e.g. frames,
trusses, beams and purlins in gymnasia, workshops, garages,
churches, shops, etc. They are also appropriate as purlins in loft
conversion.
Composite Timber Beams