Strip Footings in Foundation Engineering

Strip footings are continuous, linear concrete foundations that support load-bearing walls and partitions by spreading loads along their length to the underlying soil. They are typically rectangular in cross-section and designed to reduce soil pressure and prevent excessive settlement by distributing the structural load over a larger surface area. The width of a strip footing is calculated using the load per unit length divided by the allowable soil bearing capacity, $\displaystyle B = \frac{P}{q_{all}}$. To avoid bending failure, the minimum thickness is generally set as , where is the effective span length. Strip footings require a uniform soil bearing capacity under their length to prevent differential settlement, which can otherwise cause structural damage. They are commonly used for low-rise buildings and boundary walls where loads are distributed linearly. Proper design of strip footings ensures structural stability, cost efficiency, and durability in foundation engineering.