圆钢管再生混凝土框架滞回性能有限元分析

Finite element analysis on hysteretic performance analysis of recycled aggregate concrete-filled circular steel tube frame

为研究不同设计参数下圆钢管再生混凝土框架的滞回性能,在课题组前期研究基础上,建立了圆钢管再生混凝土框架抗震性能有限元模型,对8个试件进行了有限元分析,通过改变轴压比、梁柱线刚度比、梁柱屈服弯矩比等参数来研究圆钢管再生混凝土框架滞回性能指标。结果表明:不同变化参数下试件的滞回曲线均呈现梭形且较饱满。轴压比从0.2增至0.4时,位移延性系数前期增加后期减小,但均大于3.20;试件耗能系数能达到0.30以上。梁柱线刚度比从0.4增至0.79时,试件初始刚度增加了4.16%;位移延性系数变化幅度远远小于5%且均大于3.45。梁柱屈服弯矩比从0.15增至0.4时,位移延性系数降低16.52%;试件耗能系数能达到0.38以上且破坏点的耗能系数约为屈服点的2倍。随着加载位移的增加,不同变化参数下试件刚度逐渐退化,且退化速率逐渐趋于平缓。

To study the hysteretic performance analysis of recycled aggregate concrete-filled circular steel tube frame under different design parameters,based on our previous studies,the finite element analysis of eight recycled aggregate concrete-filled circular steel tube frame specimens is carried out,by changing the parameters including axial compression ratio,beam-column line rigidity ratio and beam-column yield bending moment ratio,the hysteretic performance indices of recycled aggregate concrete-flled circular steel tube frame are studied.The results demonstrate the hysteretic curves of the specimens to be fusiform and full for different parameters.As the axial compression ratio increases from 0.2 to 0.4,the displacement ductility coefficient first increases,followed by a decrease,but all are greater than 3.20,and the energy dissipation coefficient of specimen can reach more than 0.30.As the beam-column line rigidity ratio increases from 0.4 to 0.79,the initial stffness of the specimen increases by 4.16%,the variation range of displacement ductility coefficient is far less than 5%and is greater than 3.45.As the beam-column yield bending moment ratio increases from 0.15 to 0.4,the displacement ductility coefficient is decreased by 16.52%,the energy dissipation coefficient of specimen can reach more than O.38,and the energy dissipation coefficient at the failure point is about twice the yield point.On increasing the displacement,the secant rigidity under different design parameters gradually degenerates,and the degradation is initially fast,followed by gradual slowing downto become stable.