A 'strip footing' (continuous footing) is used when:
Choose the correct answer
One isolated column in firm soil
Wall foundations or closely spaced columns where individual footings would overlap — shares load over larger area
Pile foundations only
Only rock-founding conditions
Correct Answer
B. Wall foundations or closely spaced columns where individual footings would overlap — shares load over larger area
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Strip footing: continuous RC footing under a wall or a row of closely spaced columns. Used when: (1) Columns are so close that individual footings would overlap; (2) Load-bearing wall foundation; (3) Poor soil (spreads load over more area). Design: BM and shear at critical sections; soil pressure distribution (trapezoidal if eccentric); transverse reinforcement for bending perpendicular to wall.
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