| Summary: | Composite structural element are often used in several years ago, which
have a main weakness, expensive. IWF section is commonly used in this case. To
solve the expensive problem, utilizing the castellated beam can be used to
subtitute IWF section. The castellated beam is made from enhancing the depth of
IWF section, but have a higher flexural capacity than IWF section. If this two
system are combined into a composite catellated, then will be capable to solve the
weakness on each system.
This research objectives is to investigate the flexural behavior of composite
castellated beam with hexagonal opening encase with mortar. The test using two
speciments, castellated beam and composite beam. Composite beam is composed
from composite section which encase with mortar. Mortar mix design used in this
research have a weight ratio 1:1.5, and water-cement ratio 0.4 and admixture
viscocrete 0.7% from cement weight. Test method using static loading in two
point, and designed have a flexure failure mode.
Research result show increasing in flexural capacity from composite beam
about 229% from castellated beam. Failure mode wich occur is different for each
specimens.On composite beam, occur a lateral buckling failure, whereas on
castellated beam lateral torsional buckling was occured. With adding mortar, the
behaviour of castellated section stability is increased because along the beam
span was restrained by mortar. Using composite beam is not efficient in weight,
because it�s moment ratio bigger than 1,09%, eventhough it�s more efficient in
price, because the price ratio is less than comparable beam which has a capacity
equivalent.
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