SEISMIC PERFORMANCE OF SLURRY ANCHOR LAPPING OF CORRUGATED PIPE RESTRAINED BY SPIRAL STIRRUP

The slurry anchor lapping of corrugated pipe restrained by spiral stirrup is a technique to connect assembly components of low cost and simplicity. In order to study the seismic performance of the connection technique, two prefabricated members with slurry anchor lapping of corrugated pipe restrained by spiral stirrup and one cast-in-place structural column were designed and manufactured. The quasi-static load test was carried out to analyze the failure mode, hysteretic curve, skeleton curve, bearing capacity, ductility, stiffness degradation curve and energy dissipation capacity of the structural columns. The test results showed that:1) the slurry anchor lapping of corrugated pipe restrained by spiral stirrup connection technique could effectively connect the precast column, and its seismic performance was better than that of the cast-in-place column on the whole; 2) the crack development and failure mode of the precast structural column were similar with that of the cast-in-place specimen; 3) the seismic performance of the precast column without bonding treatment was slightly worse than that of the cast-in-place column, but the seismic performance of the column base with non-bonding treatment could be improved; 4) the ultimate bearing capacity and ductility coefficient of precast members were higher than that of cast-in-place member; 5) the average secant stiffness degradation curve of precast members was higher than that of cast-in-place member; 6) the energy dissipation capacity of precast members was higher than that of cast-in-place member, and the unbonded treatment of column base was beneficial in improving the energy dissipation capacity of assembly members.