内置GFRP管钢管混凝土柱延性非线性分析

Analysis of Influence Parameterson Ductility of Concrete Column with Built-in GFRP Tube and Circular Steel Tube under Axial Compression Bias

利用ABAQUS有限元软件建立内套圆形GFRP(玻璃纤维增强复合材料)管圆钢管混凝土组合柱轴心受压和单向偏心受压模型,研究内套GFRP管厚度、纤维缠绕角度、外层钢管厚度和构件长径比4个因素对构件的位移延性系数的影响,从而得到对构件的延性影响。结果表明:轴压工况下,此组合柱的位移延性系数随着内套圆形GFRP管厚度、长径比的增加而变小,随着外层钢管厚度递增而变大,GFRP管纤维缠绕角度在75°~90°对构件位移延性系数提升效果最好;偏压工况下,内套GFRP管厚度对组合柱的位移延性系数影响规律不明显,外层钢管厚度对构件的位移延性系数前期影响不大,但对后期影响显著,随着构件的长径比增大,构件的位移延性系数呈非线性下降。

Based on the complete analysis of mechanical properties of GFRP(glass-fiber reinforced plastic)tube-circular steel tube concrete column under axial compression and bias,in order to study the influence of the four influencing parameters of the thickness of the internal GFRP tube,the thickness of the external steel tube and the aspect ratio of the member on the ductility of the composite short column of GFRP tube-circular steel tube concrete under axial compression and bias,the finite element software ABAQUS is used to simulate the influence of the combined short column under axial compression and bias pressure under the condition of influencing parameter changes.The numerical simulation results show that the simulation results of ABAQUS are in good agreement with the experimental results.In the axial pressure state,when the diameter of the internal GFRP tube remains the same,the ductility of the composite column decreases with the increase of the thickness of the internal GFRP tube,the ductility of composite column is improved with increasing thickness of external steel tube,the ductility of composite column deteriorates with the increase of aspect ratio GFRP tube fiber winding Angle of 75°~90°has the best effect on improving the displacement ductility coefficient of components.In the state of bias mechanics,the thickness of GFRP tube has the greatest influence on the ductility of composite column,the ductility of the small eccentricity column is not affected by the thickness of the outer steel tube,the ductility of the large eccentricity column is improved with the thickness of the outer steel tube increasing,the ductility of the composite column decreases nonlinearly with the increase of the aspect ratio of the member.The decreasing speed is faster in the early stage and slower in the later stage.