火灾后方钢管再生混凝土轴压有限元分析

Axial Compression Finite Element Analysis of Square Steel Tube Filled with Regenerative Concrete after Fire

在确定了火灾后钢管与再生混凝土的本构关系、单元类型及界面接触模型的基础上,根据构件的几何和材料非线性,建立了火灾后钢管再生混凝土轴压构件的ABAQUS有限元模型.利用有限元模型计算结果,对比了不同温度和不同取代率下的方钢管再生混凝土轴压短柱的载荷-应变关系曲线.结果表明,随着温度的升高,钢管再生混凝土的极限承载力整体上呈下降趋势,极限承载力随着再生粗骨料取代率的增大而逐渐降低.

On the basic of determining the steel tube and concrete＇s constitutive relations, element type and interface contact model after fire, according to the components＇ nonlinear geometric and material, the ABAQUS finite-element model of the steel tube filled with regenerative concrete components under axial compression was established which are after the fire. By using the calculated results of the finite-element model, the load-strain curve of the square steel tube filled with regenerative concrete short columns were compared which are under axial compression by different temperature and different replacement ratio. The results show that： with the temperature increasing, the ultimate bearing capacity of the steel tube filled with regenerative concrete appears a downward trend in the mass; the ultimate bearing capacity is gradually decreasing as the replacement ratio of the recycled coarse aggregate increasing progressively.