碳纤维布加固二次受力RC构件轴拉数值

Numerical Research on Axial Tension of Secondary Load RC Members Strengthened by CFRP

目的研究碳纤维布加固二次受力钢筋混凝土构件轴拉的受力性能,探讨预加载程度、持载程度和构件开裂荷载、极限荷载之间的定量关系.方法采用大型通用有限元软件建立了碳纤维布增强二次受力钢筋混凝土轴心受拉构件计算模型,对碳纤维布加固后预加载程度和持载程度对构件开裂荷载、极限荷载的影响进行了分析,并通过8根构件进行试验对比.结果数值研究表明,计算结果与试验数据有较好的一致性,混凝土开裂后的持载对碳纤维布加固二次受力钢筋混凝土轴心受拉构件极限荷载影响很大,比不持载时提高程度降低75%.结论采用碳纤维布加固二次受力钢筋混凝土轴拉构件以提高其承载力可行,研究成果对实际工程具有借鉴作用和参考价值.

In order to study the mechanics behavior of strengthened with externally bonded carbon fiber reinforced plastic（CFRP） subject to secondary load and discuss the quantitative relation between the preloading degree, continual loading degree and cracking load, ultimate load, the general software ANSYS is adopted to establish the finite element models of secondary load axial tension of veinforced concrete members strengthened with externally bonded CFRP and used to analyze the influence of CFRP to these structural cracking loads and ultimate loads. Preloading degree and continual loading degree are some factors considered, and experiments of 8 RC members are conducted to examine the results of numerical analysis. The numerical resuits show that the calculations agree with the experimental data and it is obvious to increase ultimate load using CFRP to strengthen RC members. The study is instructive and useful in strengthening of RC members with externally bonded CFRP under axial tension.