An experimental study on the seismic performance of recycled concrete-filled square steel tube （RCFST） columns is carried out. Six specimens were designed and tested under constant axial compression and cyclic later...An experimental study on the seismic performance of recycled concrete-filled square steel tube （RCFST） columns is carried out. Six specimens were designed and tested under constant axial compression and cyclic lateral loading. Two parameters, replacement percentage of recycled coarse aggregate （RCA） and axial compression level, were considered in the test. Based on the experimental data, the hysteretic loops, skeleton curves, ductility, energy dissipation capacity and stiffness degradation of RCFST columns were analyzed. The test results indicate that the failure modes of RCFST columns are the local buckling of the steel tube at the bottom of the columns, and the hysteretic loops are full and their shapes are similar to normal CFST columns. Furthermore, the ductility coefficient of all specimens are close to 3.0, and the equivalent viscous damping coefficient corresponding to the ultimate lateral load ranges from 0.323 to 0.360, which demonstrates that RCFST columns exhibit remarkable seismic performance.展开更多
目的研究不同粗骨料取代率下L形方钢管再生混凝土组合异形柱在压弯扭等复合受力下的力学性能。方法采用ABAQUS软件建立L形方钢管再生混凝土组合异形柱有限元模型,分析其在压弯扭等复合受力下的受力机理,及常见参数对其力学性能的影响。...目的研究不同粗骨料取代率下L形方钢管再生混凝土组合异形柱在压弯扭等复合受力下的力学性能。方法采用ABAQUS软件建立L形方钢管再生混凝土组合异形柱有限元模型,分析其在压弯扭等复合受力下的受力机理,及常见参数对其力学性能的影响。结果在压弯扭复合受力作用下,不同粗骨料取代率下各试件的受力全过程均分为弹性阶段、弹塑性阶段和塑性阶段,当试件承受的轴压力大于0.4 F p且弯矩值大于0.6 M p时,试件抗扭承载力降低、延性较差。在相同的轴压力及弯矩作用下,随着粗骨料取代率的增大,试件的峰值扭矩和延性逐渐降低。结论在工程设计中,大轴压比试件应重点考虑扭矩对L形方钢管再生混凝土组合异形柱的影响。展开更多
基金the National Natural Science Foundation of China under Grant Nos.51268004 and 51578163the Guangxi Science and Technology Key Project under Grant No.12118023-3
文摘An experimental study on the seismic performance of recycled concrete-filled square steel tube （RCFST） columns is carried out. Six specimens were designed and tested under constant axial compression and cyclic lateral loading. Two parameters, replacement percentage of recycled coarse aggregate （RCA） and axial compression level, were considered in the test. Based on the experimental data, the hysteretic loops, skeleton curves, ductility, energy dissipation capacity and stiffness degradation of RCFST columns were analyzed. The test results indicate that the failure modes of RCFST columns are the local buckling of the steel tube at the bottom of the columns, and the hysteretic loops are full and their shapes are similar to normal CFST columns. Furthermore, the ductility coefficient of all specimens are close to 3.0, and the equivalent viscous damping coefficient corresponding to the ultimate lateral load ranges from 0.323 to 0.360, which demonstrates that RCFST columns exhibit remarkable seismic performance.
文摘目的研究不同粗骨料取代率下L形方钢管再生混凝土组合异形柱在压弯扭等复合受力下的力学性能。方法采用ABAQUS软件建立L形方钢管再生混凝土组合异形柱有限元模型,分析其在压弯扭等复合受力下的受力机理,及常见参数对其力学性能的影响。结果在压弯扭复合受力作用下,不同粗骨料取代率下各试件的受力全过程均分为弹性阶段、弹塑性阶段和塑性阶段,当试件承受的轴压力大于0.4 F p且弯矩值大于0.6 M p时,试件抗扭承载力降低、延性较差。在相同的轴压力及弯矩作用下,随着粗骨料取代率的增大,试件的峰值扭矩和延性逐渐降低。结论在工程设计中,大轴压比试件应重点考虑扭矩对L形方钢管再生混凝土组合异形柱的影响。
