配筋圆钢管再生混凝土短柱箍筋的作用机理

为探究100%再生粗骨料取代率下配筋钢管再生混凝土（R-RACFST）短柱中箍筋的作用机理，以箍筋形式和间距为变量，进行了轴压试验，分析了破坏模式、受力响应、延性、断裂韧性和套箍作用等，结果表明：无论采用何种箍筋形式和间距，此类构件破坏模式均表现为剪切破坏；R-RACFST各力学性能均优于钢管再生混凝土（RACFST）；箍筋形式和间距对构件峰值荷载前的受力性能、承载力和套箍作用无显著影响；就形式而言，螺旋式箍筋的延性和断裂韧性更为优越；就间距而言，随着箍筋间距的减小，构件的延性、断裂韧性更为优越。因此，就轴心受压承载力而言，求解时可不考虑箍筋形式和间距的影响，而为了获得更好的能量吸收和塑性变形性能，还是推荐采用较小间距的螺旋式箍筋。

The Influencing Rule of Lateral Hoops of Reinforced Recycled Aggregate Concrete-Filled Steel Tube Short Column

To investigate the influencing rule of lateral hoops on Reinforced Recycled Aggregate Concrete-Filled Steel Tube(R-RACFST) Short Columnwith 100% recycled coarse aggregate replacement-rate, axial compression tests were performed, using pattern and spacing of lateral hoops as variables, and the failure mode, load transfer response, ductility, fracture toughness and confinement effect were analyzed. Results showed that the failure mode characters with shear failure, regardless of pattern and spacing of lateral hoops; R-RACFST exhibits more excellent mechanical performance compared to Recycled Aggregate Concrete-Filled Steel Tube(RACFST), due to the reinforcements; the pattern and spacing of lateral hoops have no significant effect on the before-peak loading performance, bearing capacity and confinement effect; as far as the pattern is concerned, spiral hoops are superior in ductility and fracture toughness; as far as the spacing is concerned, ductility and fracture toughness is superior with the decrease of the spacing. As results, in terms of the bearing capacity of R-RACFST subjected to axial loading, the influence of pattern and spacing of lateral hoops can be neglected; and in order to perform better energy absorption and plastic deformability, it is still recommended to adopt the spiral lateral hoops with tighter spacing.