Experimental study on seismic behavior of square steel tube spiral reinforcement confined self compacting high strength concrete columns
To investigate the seismic behavior of square steel tube spiral reinforced confined self-compacting high-strength concrete columns,low-cycle repeated loading tests were carried out on 7 specimens with axial compression ratio,shear-span ratio,presence or absence of spiral reinforcement,and spacing of spiral reinforcement as design parameters.The hysteresis curves and strain distribution were obtained.The results showed that the failure patterns of the specimens were mainly the appearance of bulges at the foot of the column,forming a plastic hinge zone.With the increase of axial compression ratio,the seismic capacity,stiffness,and energy dissipation capacity of the specimens all increased,while the influence of shear-span ratio on the seismic behavior of the specimens was not significant.The effect of spiral reinforcement on ultimate bearing capacity and stiffness was relatively small,but it can improved the ductility and energy dissipation of the specimens.Compared with specimens without spiral reinforcement,the ductility and energy dissipation of the specimens on average increased by 15.4%and 114.9%,respectively.The closer the spacing of the spiral reinforcement,the better the effect on improving the seismic performance of the specimens.Appropriately increasing the axial compression ratio,controlling the shear-span ratio within 5,and adding spiral reinforcement have a positive effect on improving their bearing and deformation capacity.
square steel tubespiral reinforcementself compacting high strength concretecolumnsseismic behavior
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