Combined footings under two or more columns are also used under closely spaced, heavily loaded interior columns, if single footings were provided, would comp1etely or nearly merge.

• 在间距小、荷载大的柱下也可采用双柱或多柱的联合基础。如果在这种情况下采用独立基础，它们将完全或几乎完全连成一块。