再生混凝土长柱的抗震性能研究

Research on seismic performance of recycled concrete long columns

为了提升方钢管再生混凝土结构的抗震性能,文章设计了7组方钢管再生混凝土试件,研究了轴压比、壁厚和长细比对方钢管再生混凝土试件滞回曲线、承载能力和刚度退化等的影响.结果表明,轴压比更大的试件的滞回曲线相对饱满,抗侧承载力相对轴压比更小的试件有所提高;钢管壁厚更大的试件的滞回曲线更为饱满、耗能能力也相对壁厚较小试件更大,壁厚较小试件的刚度退化相对更加明显;长细比更大的试件的承载能力相对长细比更小的试件有所减小.钢管壁厚不会对弹性阶段刚度产生明显影响,长细比小的试件在低周往复加载过程中的抗侧刚度较大、水平承载力相对较大,轴压比更大的试件的水平承载力会相对较大.在往复低周加载过程中,钢管壁厚不会对刚度退化产生明显影响,长细比越大的试件的刚度退化相对较慢,轴压比越大则试件的刚度退化系数要小、刚度退化越快.

In order to improve the seismic performance of recycled concrete-filled square steel tubular structures,seven groups of recycled concrete-filled square steel tubular specimens are designed in this paper.The effects of axial compression ratio,wall thickness and slenderness ratio on the hysteretic curve,bearing capacity and stiffness degradation of recycled concrete-filled square steel tubular specimens are studied.The results show that the hysteretic curves of specimens with larger axial compression ratio are relatively full,and the lateral bearing capacity is higher than that of specimens with smaller axial compression ratio.The hysteretic curve of the specimen with larger wall thickness is fuller,the energy dissipation capacity is larger than that of the specimen with smaller wall thickness,and the stiffness degradation of the specimen with smaller wall thickness is more obvious.The bearing capacity of the specimens with larger slenderness ratio is reduced compared with the specimens with smaller slenderness ratio.The wall thickness of steel pipe will not have a significant impact on the stiffness in the elastic stage.The specimens with small slenderness ratio have large lateral stiffness and relatively large horizontal bearing capacity during low cycle reciprocating loading,and the specimens with larger axial compression ratio have relatively large horizontal bearing capacity.In the process of reciprocating low cycle loading,the wall thickness of the steel pipe will not have a significant impact on the stiffness degradation.The greater the slenderness ratio,the slower the stiffness degradation of the specimen.The greater the axial compression ratio,the smaller the stiffness degradation coefficient and the faster the stiffness degradation.