Transcription of 22 COMPOSITE BEAMS – II
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22 COMPOSITE BEAMS – II
DESIGN OF COMPOSITE BEAMS -II. COMPOSITE BEAMS II. 22. INTRODUCTION. A steel concrete COMPOSITE beam consists of a steel beam, over which a reinforced concrete slab is cast with shear connectors, as explained in the previous chapter. Since COMPOSITE action reduces the beam depth, rolled steel sections themselves are found adequate frequently (for buildings) and built-up girders are generally unnecessary. The COMPOSITE beam can also be constructed with profiled sheeting with concrete topping, instead of cast-in place or precast reinforced concrete slab. The profiled sheets are of two types Trapezoidal profile Re-entrant profile (a) Trapezoidal profile (b) Re-entrant profile Fig. 1 Types of profile deck These two types are shown in Fig 1. The profiled steel sheets are provided with indentations or embossments to prevent slip at the interface.
As composite floor beams, their usage is limited by shear capacity. These are generally unsuitable for use as primary beams in a grillage, because the associated shears would require either stiffening to or infilling of the end openings, thereby …
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