偏心率对工字型CFRP-高强圆钢管高强混凝土短柱力学性能的影响  

Effect of Eccentricity Ratio on Mechanical Behavior of High-strength Concrete-Filled High-strength Circular Steel Tube Short Columns with Inner I-shaped CFRP Profiles

作　　者：李帼昌[1] 于潇 李晓 LI Guochang;YU Xiao;LI Xiao(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第4期577-586,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金重点项目(51938009)。

摘　　要：目的研究偏心率对内置工字型CFRP型材的高强圆钢管高强混凝土短柱力学性能的影响。方法利用ABAQUS有限元软件建立了工字型CFRP-高强圆钢管高强混凝土短柱模型,分析不同偏心率下构件的受力-变形关系、各材料分担荷载以及应力发展,探究混凝土强度、钢材屈服强度、含钢率和CFRP型材对组合柱力学性能的影响。结果随着偏心率的增大,构件延性提高,初始刚度与极限承载力降低,且降低幅度减小,偏心率与极限承载力呈非线性关系;偏心率越小,加入CFRP型材对组合柱承载力的提高越显著。结论偏心率越大,混凝土强度的利用率越低,钢管力学性能发挥越充分。偏心率小于0.328时,建议采用增大混凝土强度的方式增加构件极限承载力;偏心率大于0.328时,建议采取增大钢材屈服强度和含钢率的方式增加构件的极限承载力。In order to study the influence of eccentricity on the mechanical properties of high strength concrete filled high strength circular steel tube short columns with inner I-shaped CFRP profiles.I-shaped CFRP-high strength concrete filled high strength circular steel tube short column model is established by using ABAQUS finite element software.The stress-deformation relationship,load sharing and stress development of each material under different eccentricity ratios are analyzed.The effects of concrete strength,steel yield strength,steel ratio and CFRP profile on the mechanical properties of composite columns were investigated.With the increase of eccentricity,the ductility of the members increases,the initial stiffness and ultimate bearing capacity decrease,and the decrease amplitude decreases.There is a nonlinear relationship between eccentricity and ultimate bearing capacity.The smaller the eccentricity,the more significant the improvement of the bearing capacity of the composite column by adding CFRP profiles.The greater the eccentricity ratio,the lower the utilization rate of concrete strength,and the more fully the mechanical properties of the steel tube are exerted.When the eccentricity is less than 0.328,it is recommended to increase the ultimate bearing capacity of the component by increasing the concrete strength.When the eccentricity is greater than 0.328,it is recommended to increase the ultimate bearing capacity of the component by increasing the yield strength and steel content of the steel.

关 键 词：单向偏压短柱 工字型CFRP型材 高强钢管 高强混凝土 

分 类 号：TU391[建筑科学—结构工程]