A 'corbel' in RC is designed for shear-to-depth ratio a/d ≤ 1 using:
Choose the correct answer
Standard beam flexure (M/Z) with no shear check
Strut-and-tie model (STM) — inclined compressive strut + horizontal tensile tie; IS 456 Annex B for a/d ≤ 1
Column interaction diagram
Simple bending formula M = Vu×a
Correct Answer
B. Strut-and-tie model (STM) — inclined compressive strut + horizontal tensile tie; IS 456 Annex B for a/d ≤ 1
Why is this the answer?
Corbel (bracket): short cantilever with a/d ≤ 1. Design by strut-and-tie model (STM): inclined strut carries compressive force; horizontal tie at top carries tension = Vh = Vu×a/z ≈ Vu×a/0.9d. Main reinforcement: closed horizontal ties at top (tension). Framing bars: additional closed links below main bars for confinement. IS 456 Annex B: empirical design chart for a/d ≤ 1. Bearing area: critical at column face.
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