To investigate the seismic performance of partially-encased composite beam-column nodes with steel and concrete(PEC beam-column node)with different connection details,quasi-static loading tests were conducted on two PEC beam-column nodes specimens.The failure phenomenon,hysteretic curve,skeleton curve,ductility,energy dissipation capacity and stiffness degradation of PEC beam-column node specimens under low cyclic load were studied.The results show that the hysteresis curves of the PEC beam-column nodes with strong-axis connections exhibit a lozenge and bow-shaped pattern,and can maintain a certain degree of ductility and energy dissipation capacity after reaching the ultimate bearing capacity.The weld between the corbel and the beam at the PEC beam-column nodes with weak-axis connection is damaged,which does not show the expected energy dissipation capacity,and the PEC beam is still in the elastoplastic state and does not reach the limit state.After replacing the core area concrete in the PEC beam-column node with reinforcing rib plates,the specimens retaining good capacity,ductility and energy dissipation capacity.The degradation pattern of stiffness shows no significant change,and the stiffness variation of nodes with strong-axis and weak-axis connection are generally consistent.An inadequately designed length of PEC column corbel can lead to fractures at the weld connections,limiting the expression of ductility and energy dissipation capacity,and resulting in a comparatively high residual stiffness.
partially-encased composite beam-column node of steel and concretestrong-axis connectionweak-axis connectiondamage modeseismic performance
NETL
NSTL
万方数据
