CFRP管约束混凝土柱轴压性能试验及有限元分析研究

Experimental and Finite Element Analysis on Axial Compression Performance of Concrete Columns Confined with CFRP Tubes

本工作以长细比、约束效应系数和配箍率为参数,设计制作了六个碳纤维增强复合塑料(CFRP)管约束混凝土柱,并对其轴心受压受力性能进行试验。研究结果表明:CFRP管约束混凝土柱轴压力学性能与长细比、约束效应系数和配箍率关系紧密,影响强度从大到小依次为:约束效应系数、配箍率和长细比。在试验研究的基础上,利用ABAQUS非线性有限元软件对其轴压性能进行了数值模拟分析研究,对CFRP管约束混凝土柱的约束机理和CFRP管对核心混凝土的约束作用进行了探讨。研究结果表明,试验值、承载力模型、数值模拟分析结果吻合良好,验证了理论计算模型与有限元模型的可靠性。在此基础上,扩大了参数的范围和种类,利用有限元分析了各种参数对CFRP管约束混凝土柱的影响规律。CFRP管约束混凝土柱轴压承载力随着约束效应系数、配箍率的增大而增大,随着长细比的提高而减小。CFRP管的约束作用能够有效提高构件的承载力和延性。

In this work,six CFRP tube confined concrete columns were designed and fabricated with slenderness ratio,confinement effect coefficient and stirrup ratio as parameters,and the axial compression mechanical properties were tested.The experimental results show that the axial compressive mechanical properties of CFRP tube confined concrete columns are closely related to slenderness ratio,confinement effect coefficient and stirrup ratio,and the influence intensity from large to small is as follow:confinement effect coefficient,stirrup ratio and slenderness ratio.On the basis of experimental study,the axial compression performance of concrete columns confined by CFRP tubes was numerically simulated and analyzed by ABAQUS nonlinear finite element software,and the constraint mechanism of CFRP tubes on concrete columns and the constraint effect of CFRP tubes on core concrete were discussed.The research results show that the test values,bearing capacity model and numerical simu-lation analysis results are in good agreement,which verifies the reliability of the theoretical calculation model and the finite element model.On this basis,the range and types of parameters are expanded,and the influence law of various parameters on CFRP tube confined concrete colu-mns is analyzed by finite element method.The axial compressive bearing capacity of CFRP tube confined concrete column increases with the increase of confinement effect coefficient and stirrup ratio,and decreases with the increase of slenderness ratio.The confinement effect of CFRP tube can effectively improve the bearing capacity and ductility of members.