The rigidity of a foundation affects how much weight is carried by the piles and the soil. A study looked at different types of foundations and found that rigid ones allow both the piles and soil to support weight well. Flexible foundations, on the other hand, mainly rely on the soil for support. Rigid foundations have a higher pile load share ratio, meaning the piles carry more weight compared to flexible foundations. However, flexible foundations have a higher soil load share ratio, meaning the soil supports more weight than in rigid foundations.