型钢区域约束混凝土柱抗震性能试验研究及CDP模型参数分析

Experimental study on seismic behavior of steel regional confined concrete column and parameter analysis on CDP model

通过一剪跨比为3.43的型钢区域约束混凝土柱的试验研究和有限元模拟分析对其抗震性能进行了研究,研究表明:高轴向压力下型钢区域约束混凝土柱抗震性能良好。同时,补充分析了11个有限元模型,研究了膨胀角、粘性系数及受压损伤对型钢区域约束混凝土柱有限元模型抗震性能的影响。分析表明:膨胀角取值越小,水平承载力越低、割线刚度越小、等效粘滞阻尼系数越大;粘性系数取值较小时模型不易收敛,取值较大时模拟结果与试验结果差异较大;混凝土损伤取值越小(βc越大),模型水平承载力越大,割线刚度越大,水平加载位移较小时βc取值对模型的等效粘滞阻尼系数影响不大,水平加载位移达一定值后βc取值越小,等效粘滞阻尼系数随加载水平位移增大而增大的幅度越快。

The seismic behavior of a steel regional confined concrete column（ SRCC） with shear span ratio of 3. 43 is researched through experimental study and finite element simulation analysis,the researches show that SRCC has excellent earthquake resistance at high axial pressure. Meanwhile,11 additional finite element analysis models are finished and the impact of dilation angle,viscosity coefficient and concrete compression damage for seismic behavior of finite element models of SRCC are analyzed. The analysis shows that the smaller dilation angle will cause lower horizontal bearing capacity,the smaller secant stiffness and the larger equivalent viscous damping coefficient. The finite element models aren＇t easy to convergence with small viscosity coefficient, and the test results are significantly different from the analysis results with larger viscosity coefficient. The minor concrete damage（ namely the larger βc） will obtain larger horizontal bearing capacity and secant stiffness,βchas no significant impact on equivalent viscous damping coefficient under smaller horizontal loading displacement,the growth amplitude of equivalent viscous damping coefficient will increase with the increase of horizontal loading displacement after horizontal loading displacement reaches a certain value.