Experimental Investigation of Ductility of In-Ground Hinges in Solid and HollowPrestressed Piles. Structural Systems Research Project

摘要

Analytical studies have indicated that, in developing the full inelasticpotential of the pile-cap connection, a plastic hinge may be expected to form in the pile shaft. An experimental program of six solid and four hollow prestressed piles was completed. Glassfibre jacketing significantly increased maximum flexural strength at the expense of ductility, and at the cost of an undesirable failure mode (complete tendon rupture); glassfibre jackets in the configuration tested can therefore only be recommended when ductility demand are low to moderate. The hollow piles tested failed through compression failure of the shell. The performance of hollow prestressed piles was insensitive to transverse reinforcement and external confinement, and ductility capacity was reduced by the inclusion of nonprestressed longitudinal reinforcement.