| Summary: | With certain technological advances available, especially in construction
technology, there exist various innovations in the materials of wood, reinforced
concrete and steel structural truss used as roofs. These materials possess their own
advantages and disadvantages in terms of durability, strength, utilization, and
economy. The increasing inavailability of strong, quality structural wood has
resulted in the soaring price of wood used in basic structural truss of houses and
various larger-scale buildings.. In this investigation, we propose the use of a type
of composite material made of cold formed stell profile-C (75x35) of 1 mm
thickness filled with light-weight concrete made of the mixture of concrete and
wood fibres, in order to increase the strength and over-all performance of
structural roof truss as well as optimize the durability and construction thereof.
In this investigation, we shall discuss the behavior of structural roof frameworks
of 6 m lengthusing composite materials such as cold formed steel C profile 75x35
1 mm thick with lightweight concrete as filler that is made from a mixture of
sawdust concrete on the inside of C profil. The composite truss compared with
reinforced concrete and cold formed steel structural truss. Loads of the roof is
calculated based on the 3 meters of distance between trussand at an angle of slope
of the roof is 30o. The manufacture of the test specimen in the form of a full-scale
model with joint-roller at pedestal. Tests were conducted in the form of static
loading placed on the 3 joints of the truss and then measured the amount of
deflection structure and stresses that occurs at the critical bar. Based onresultof the
test can be obtained the behavior and ability of truss structure terms service
abilitylimits and ultimate strenght.
Weight oftruss structural roof that made of cold formed steel with mortar sawdust
on all bar as filler is 81.1 kg with a maximum load capacity of 2393 kg, the truss
lightweight steel (cold formed steel) structure weighs 21.3 kg with a maximum
load capacity of 734.2 kg. For truss weighing 496.4 kg reinforced concrete
capable of withstanding a load of 6611 kg. The addition of sawdust mortar into C
profilecold formed steel was increasing considerable strength. Almost the same
stiffness and ductility both of. The cost of composite truss more expensive and
have longer duration for manufacturing than cold formed steel truss. When
compared with the structure of reinforced concrete truss, the new alternative
composite truss is cheaper and faster process.
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