Which type of foundation is used to address the settlement of multiple columns?

When dealing with the settlement of multiple columns, a combined footing is particularly effective. This type of foundation is designed to support more than one column and provides a stable platform to distribute loads from the columns over a larger area.

Settlement issues can arise when individual column footings are not able to adequately support the loads or provide necessary stability, particularly in cases where the columns are close together or where soil conditions are less than ideal. By utilizing a combined footing, the foundation effectively integrates their support system, minimizing differential settlement between the columns. This approach can help to ensure that the structure above remains level and stable, addressing concerns related to uneven settling.

Other foundation types, such as spread footings or continuous footings, primarily focus on single-column or wall applications and may not provide the same level of stability when multiple columns are involved. Strip footings are typically used for load-bearing walls rather than for supporting multiple discrete columns. Therefore, the combined footing is uniquely suited to handle the complexities associated with settlement across multiple supports.