Experimental Analysis of Piled Raft Foundations Under Inclined Loading: Insights Into Resistance Enhancement Through Corner Pile Diameter Variation

Combined piled raft foundations (CPRF) are widely used for high-rise structures due to their ability to effectively manage total and differential settlements. The advantages of CPRF include improved load-bearing capacity and enhanced structural stability. Understanding the behavior of CPRF under inclined loading conditions is crucial for ensuring the safety and serviceability of structures subjected to such loads. This study focuses on the performance of CPRF on sand under inclined loading conditions and investigates methods to enhance resistance against such loads. Experimental tests were conducted on piled raft foundations on sand subjected to inclined loading at 0°,30°,45°,60°, and 90° to vertical. The test result shows that the initial yield load (IYL) and final yield load (FYL) are decreased while the inclination angles increase. To enhance resistance against inclined lading corner pile diameter was varied, while raft dimensions, pile spacing, pile length, and relative density were kept constant. This approach allows for a detailed examination of the effects of corner pile diameter on CPRF behavior under inclined loads. Results indicate that increasing the diameter of corner piles can significantly improve load-carrying capacity and reduce settlement under inclined loads. The load-settlement curves and derived equations highlight the relationship between inclination angles and yield loads, showing a decrease in yield loads with increased inclination.