基于纤维模型的圆钢管混凝土柱的抗震性能  

Seismic behavior of circular concrete-filled steel tube columns with fiber model element

作　　者：张岚[1] 方亮[1] 魏刚[1] 

机构地区：[1]湖南农业大学工学院,湖南长沙410128

出　　处：《湖南农业大学学报（自然科学版）》2014年第6期669-676,共8页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：湖南省教育厅项目(11B062)

摘　　要：基于纤维模型宏观单元和开源软件Open SEES,对圆钢管混凝土柱在低周静力反复荷载下的荷载–位移滞回曲线进行了数值模拟,模拟结果与试验结果吻合较好;以含钢率、轴压比、材料强度为参数,数值模拟了这些参数对圆钢管混凝土柱滞回骨架曲线的影响,分析了各参数对圆钢管混凝土柱的抗震性能的影响。结果表明,随着含钢率的提高,柱的承载力、弹性阶段刚度会相应提高;随着轴压比提高,其延性降低,其抗震性能变差;随着钢材强度的提高,试件的承载力也会随之提高;对于非高强混凝土,其强度对试件最大承载力、弹性阶段刚度影响不明显。Based on the macro-element of fiber model and open source software OpeenSEES, the hysteresis curve of circular concrete-filled steel tube columns（CFST） between lateral load and displacement under low cyclic static statement are given with numerical simulation in this paper; it proved that the results predicted by the model were in good agreement with that obtained from experiments. The influences of parameters including steel ratio, axial compression ratio and material strength on hysteretic skeleton curve and on seismic behavior of circular concrete-filled steel tube columns were analyzed. The results showed that increasing steel ratio led to higher bearing capacity and elastic stiffness, increasing axial compression ratio led to inferior ductility and seismic behavior, and increasing steel strength led to higher bearing capacity except for low strength concrete whose strength showed no obvious effect on bearing capacity and elastic stiffness distinctly.

关 键 词：纤维模型 骨架曲线 含钢率 轴压比 材料强度 

分 类 号：TU398[建筑科学—结构工程]