Metal structures are a great asset in the
construction of industrial areas. They offer
advantages such as speed,
economy, versatility of design, large openings and
good behavior under
earthquake. Detailed design of the members and
connections is demanded so that quality and
precision during cutting and welding of
individual blocks is achieved in the factory. A
further prequisite should
be the complete prefabrication of the construction
groups so that on-site
welding, which is of questionable quality, is
avoided. At the same time
errection, placing, bolting are achieved and perfect
fitting of the members is realized.
Metal structure with 30m spans, with two story
office areas, of total area 18.000m2, was
completed within six months. The office
floors are composite elements of an average
thickness of concrete of
10cm. Seismic forces are undertaken by metal cores
of stairs and elevators.
Prestressed clinker silo of 50.000t capacity in
Volos, with wall thickness of 40cm was
constructed using sliding metalform. Its roof
shell was constructed using metalform in free
cantilever method. Temperature differences
were of a class of 50οC and therefore special
calculations for cracking were required. The
foundation was on piles on two different levels.
A metal roof of a span of 60m and 140m long, for
covering raw materials, was designed and
constructed in Chalkis. The roof was designed
as a light space trichord truss of hollow sections.
Steel consumption was 35 kg/m2 which is
considered to be very low for such a span. Special
calculation was required for wind loads, due
to its form.
In UAE, cement and clinker silos have been founded
on sandy soil using a relatively stiff slab
on short friction piles. Differential
settlements have been avoided through
foundation. Dynamic earthquake loads are also
afforded without risk of soil liquifaction.