摘要
目的研究考虑FRP筋-混凝土粘结滑移的FRP-RC柱力学性能,比较不同荷载偏心距与FRP筋直径情况下柱体压弯全过程与极限承载能力的差异.方法在已有试验的基础上建立FRP-RC偏压柱有限元模型,并引入改进的BPE(Bertero-Popov-Eligehausen)模型,研究粘结滑移对压弯柱受力全过程的影响.结果FRP筋-混凝土粘结滑移初始刚度是影响柱体压弯性能的主要因素,当BPE模型上升段曲线指数减小80%,柱体偏压刚度最大提高约14%,承载力最大提高约9%.峰值粘结应力及峰值滑移量对柱体压弯刚度影响不显著,但会小幅影响柱体承载能力.结论当荷载偏心距增大,FRP筋-混凝土粘结滑移对柱体力学性能的降低作用逐渐显现;当荷载偏心率相同时,随着柱截面配筋率增大,柱体极限承载力降低,P-M相关曲线偏离度增大.
To study the mechanical properties of FRP-RC columns with FRP bars and concrete bond slip,and compare the difference between the whole process and ultimate bearing capacity of the columns under different load eccentricity and FRP bars diameter.The finite element model of FRP-RC biased columns was established on the basis of the existing experiments,and an improved BPE(bertero-popov-eligehausen)model was introduced to study the influence of bond slip on the whole process of stress of the bending columns.The initial bond-slip stiffness of FRP bars and concrete was the main factor affecting the bending performance of the column.When the curve index of the rising section of BPE model decreased by 80%,the maximum increase of the column′s bias stiffness was about 14%,and the maximum increase of the bearing capacity was about 9%.The effect of peak bonding stress and peak slip on the bending stiffness of the column was not significant,but would slightly affect the bearing capacity of the column.When the load eccentricity increases,the decreasing effect of FRP bar-concrete bond slip on the mechanical properties of the column gradually appears;When the eccentricity of load is the same,with the increase of reinforcement ratio of column section,the ultimate bearing capacity of column decreases and the deviation of P-M correlation curve increases.
作者
朱春阳
王可心
孙天娇
郑勇
ZHU Chunyang;WANG Kexin;SUN Tianjiao;ZHENG Yong(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Shenyang Weide Technology Group Co.Ltd.,Shenyang,China,110100)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第2期220-228,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家重点研发计划项目(2018YFC1504303)
国家自然科学基金项目(51578347)。
关键词
FRP筋混凝土
粘结滑移
压弯性能
P-M相关关系
FRP reinforced concrete
bond slip
compression-bending performance
P-M interaction diagram
