摘要
在合理选取碳纤维增强复材(CFRP)、钢材和核心混凝土的材料本构模型及其各自单元类型并结合构件实际受力情况设置了相应的接触模型、边界条件和加载方式的基础上,建立了CFRP包裹带环向脱空缺陷的钢管混凝土构件在轴心受压状态下的有限元模型。验证模型的可靠性后,利用所建立的有限元模型对CFRP包裹带环向脱空缺陷的钢管混凝土构件的荷载-变形过程、各部件的应力发展及接触应力变化进行了剖析。结果表明,环向脱空缺陷的存在使得钢管与核心混凝土的接触时刻延迟,二者在峰值荷载前没有发生接触,各自均单独受力。CFRP在达到其极限抗拉强度之前,限制了外钢管的变形,延长了钢管与核心混凝土在接触之后的共同工作时间,提高了二者之间的接触应力及构件的轴压承载力。
Based on the reasonable selection of carbon fiber reinforced composite(CFRP),steel and core concrete material constitutive models and their respective element types,combined with the actual stress of the members,the corresponding contact models,boundary conditions and loading methods,a finite element model of CFRP wrapped concrete-filled steel tubes with circumferential gap under axial compression is established.After verifying the reliability of the model,the established finite element model was used to analyze the load-deformation process,the stress development of each component and the change of contact stress of CFRP wrapped concrete-filled steel tubes with circumferential gap.The results show that the existence of circumferential gap delays the contact time between the steel tube and the core concrete,they did not come into contact before the peak load,and each is subjected to a separate force.Before reaching its ultimate tensile strength,CFRP limits the deformation of the outer steel tube,prolongs the common working time between the steel tube and the core concrete after contact,and improves the contact stress between them and the axial compression bearing capacity of the component.
出处
《福建建设科技》
2021年第1期32-37,共6页
Fujian Construction Science & Technology
关键词
CFRP
环向脱空缺陷
钢管混凝土
轴压性能
有限元分析模型
CFRP
circumferential gap
concrete filled steel tube(CFST)
axial compression performance
finite element analysis(FEA)model
