Abstract
Nowadays, castellated beam becomes popular in building structural as beam members. This is due to several advantages of castellated beam such as increased depth without any additional mass, passing the underfloor service ducts without changing of story elevation. However, the presence of holes can develop various local effects such as local buckling, lateral torsional buckling caused by compression force at the flange section of the steel beam. Many studies have investigated the failure mechanism of castellated beam and one technique which can prevent the beam fall into local failure is the use of reinforced concrete slab as lateral support on castellated beam, so called composite castellated beam. Besides of preventing the local failure of castellated beam, the concrete slab can increase the plasticity moment of the composite castellated beam section which can deliver into increasing the ultimate load of the beam. The aim of this numerical studies of composite castellated beam on certain loading condition (monotonic quasi-static loading). ABAQUS was used for finite element modelling purpose and compared with the experimental test for checking the reliability of the model. The result shows that the ultimate load of the composite castellated beam reached 6.24 times than the ultimate load of the solid I beam and 1.2 times compared the composite beam.
Highlights
Castellation is one of technique for increasing the bending strength of steel beam and produce a new section property called castellated beam or known as honey comb beam
Fig.3. shows that the compression region lies on the concrete slab, while the tension region is in castellated beam, in this condition, reinforced concrete slab can prevent local buckling and Vierendeel mechanism so that the section can be developed until the plastic moment is reached
The composite beam which using shell elements 4-node with reduced integration (S4R) and multi point constraint (MPC) constraint was success to predict accurately the load-displacement curved compared with the numerical result which using solid element and the experimental result
Summary
Castellation is one of technique for increasing the bending strength of steel beam and produce a new section property called castellated beam or known as honey comb beam. Besides increasing the bending capacity of the beam, there are several advantages of using castellated beam such as reducing the total weight of the structures, passing the underfloor services (ducting and plumbing). The concrete section will experience compression while tension will occur in the steel profiles. Local buckling won’t happen on the steel profiles caused by there is no compression force on the steel. The other advantage of using composite on the castellated beam is to increase the plastic moment of the steel beam which automatically increase the bending capacity of the beam. This paper considered a composite castellated beam as a comparison and validation with the composite beam (not castellated) which have been done [1]
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