Abstract: Based on the rule that the moment of piles under horizontal load decreases suddenly along the depth, the top of pile was designed as steel pipe piles having good bending properties and the rest of it was designed as PHC pile having weak bending properties, and chosen desired location to connect by welding and so on. Hammering test, horizontal bearing capacity test and bending properties test were carried out; and then compare compressive stress, tensile stress and horizontal bearing capacity with allowable value. Test results show that material composite pile gives full play to material properties, especially performing well at the aspect of horizontal bearing capacity; and the connection has a good performance. The study results can provide new ideas and test basis for the improvement of piles.

Key words: composite piles, horizontal load, bearing capacity；steel pipe piles, prestressed high concrete(PHC) piles