Dynamic centrifuge model test of pile-supported building with semi-rigid pile head connections in liquefiable soil

摘要

Dynamic centrifuge model tests were conducted to investigate the seismic behavior of buildings with semi-rigid pile head connections in liquefiable soil. The test results and analysis show that: (1) The semi-rigid pile head connections effectively reduce the bending moment of piles both before and during liquefaction; (2) The natural period of the soil-pile-structure system with semi-rigid pile head connections becomes longer than that with rigid pile head connections during liquefaction; (3) The hysteresis damping in the relation between inertia force of the structure and displacement of the foundation, with semi-rigid pile head connections, increases with larger displacement; and (4) The maximum acceleration of the superstructure with semi-rigid pile head connections is considerably smaller than that with rigid pile head connections in liquefied soil..