The study looked at how a type of foundation with both long and short piles works together with the soil. They did tests with physical models to see how the foundation supports weight and how stiff it is. They found that longer piles can hold more weight, but having multiple piles can make the foundation less stiff. The long pile affects settling more than the short pile. They also figured out how to adjust the stiffness of the foundation based on the length of the piles. This information can help design better composite foundations.