The 'effective width' of a composite beam slab (IS 11384) acting with a steel beam is limited to control:
Choose the correct answer
Shrinkage of the concrete slab only
Shear lag (non-uniform bending stress across wide slab) — outer portions lag behind web in receiving stress; IS 11384: beff ≤ Le/8 per side
Maximum concrete grade allowed in composite slab
Wind load on the exposed slab edge
Correct Answer
B. Shear lag (non-uniform bending stress across wide slab) — outer portions lag behind web in receiving stress; IS 11384: beff ≤ Le/8 per side
Why is this the answer?
Effective flange width (IS 11384:2022 / Eurocode 4): limits width of RC slab acting with steel beam to: beff = b0 + Σbei where bei ≤ Le/8 per side (Le = effective span), and ≤ (actual distance to slab edge or to midpoint between beams). Limit controls: shear lag effect (outer slab cannot receive full shear from web). Without limit: over-estimated stiffness and strength. Shear connectors also limit: partial interaction reduces effective participation.
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