内置GFRP管-钢管混凝土组合柱的轴压力学性能分析

Axial Compression Mechanical Performance Analysis of a Built-in GFRP Tube Concrete Filled Steel Tube Composite Column

在数值计算本构模型的基础之上,对内置GFRP管-钢管混凝土组合柱的轴压力学性能展开深入的数值模拟计算分析。研究结果表明,组合柱的最大轴压荷载随着GFRP管直径的增大而增大,极限承载力随着壁厚的增加而增大,且基本呈线性增长关系;在弹性阶段,GFRP管纤维缠绕角度不起作用;在弹塑性阶段,随着纤维缠绕角度的增大仅限承载力先减小后增加,且呈开口向上的二次抛物线型,缠绕角度为0°比45°的组合柱所能承受的荷载增加15.7%;组合柱外侧钢管的厚度大小对组合柱的轴压力学性能影响较为明显,且组合柱的极限承载力与钢管壁厚呈线性增长关系;组合柱的极限承载力随着混凝土强度等级的增加基本呈线性增加。

Based on the numerical calculation constitutive model,the axial compression mechanical properties of GFRP pipe concrete filled steel tubular composite columns were numerically simulated and analyzed.The results show that the combination of the column and the maximum axial load increases with the increase of GFRP tube diameter,wall thickness increases with the increase of ultimate bearing capacity,and increases linearly;in the elastic phase,GFRP tube has no effect on fiber winding angle;in the elastic-plastic stage,with the increase of fiber winding angle only first decreases the bearing capacity increases,and is opening two parabolic upward,winding angle is 0 degrees higher than 15.7%degrees 45 column load combination can withstand the thickness of steel tube composite column;lateral size of column axial compression mechanical properties is more obvious,and the limit of composite column bearing force and pipe wall thickness increases linearly;the ultimate bearing capacity of composite columns with the increase of concrete strength grade increases linearly.