The seismic performance of precast T-shaped joints and cross-shaped joints after the longitudinal bar spacing of prefabricated column is enlarged is studied,which provides a basis for practical engineering.low cyclic reversed loading tests were carried out on five full-size beam-column joint specimens.By comparing the hysteretic curve,skeleton curve and displacement ductility of each specimen,the effects of three parameters,joint type,longitudinal bar spacing of prefabricated column and axial force ratio,on the seismic performance of the beam-column joint were studied.The beam end bending failure occurred in all the prefabricated joints,but no obvious failure was found in the core area of the prefabricated column and the joint.The main failure was the buckling of the longitudinal bar at the bottom of the prefabricated beam end and the crushing of the concrete at the bottom of the beam end.The floor slab strengthens the negative moment resistance of the superimposed beam,and obvious horizontal shear cracks appear at the interface of cast-in-place concrete and precast concrete in the upper part of the superimposed beam.The bearing capacity of T-shaped joints and cross-shaped joints is increased by 9.2%and 1.3%respectively.The ductility and energy dissipation capacity of the specimens amplified by column longitudinal bar spacing are not much different from those of the contrast specimens.The amplification of the longitudinal bar spacing of prefabricated column has little effect on the seismic performance of beam-column joints.There is little difference in the displacement ductility coefficient between the T-shaped joint and the cross-shaped joint.
关键词
装配混凝土节点/抗震性能/足尺试件/低周往复荷载试验
Key words
precast joint/seismic performance/full size specimen/low cyclic reversed loading test
维普
万方数据