中文摘要：

结合在役钢筋混凝土受拉构件承载力不足的特点,推导了碳纤维布增强二次受力钢筋混凝土构件轴心受拉计算表达式,探讨了预加载程度、持载程度和构件开裂载荷、极限载荷之间的定量关系,并进行了8根碳纤维布增强二次受力钢筋混凝土构件轴心抗拉性能试验研究,分析预加载程度、持载程度对构件开裂载荷和极限载荷的影响。结果表明,粘贴碳纤维布可以有效地提高二次受力钢筋混凝土轴心受拉构件极限承载力。所提表达式与试验数据有较好的一致性,可供实际工程设计参考,并对二次受力钢筋混凝土轴心受拉加固具有理论指导意义和工程应用价值。

英文摘要：

To overcome the problem of insufficient beating capacity in some existing aging reinforced concrete （RC）, a formulation is presented in this paper for calculating the tension capacity of the secondary load RC members strengthened with externally bonded carbon fiber reinforced plastic （CFRP） sheets. Also, the relationship between preloading/continual loading and cracking load/ultimate load is investigated. Eight RC members are tested to examine the impact of preloading and continual loading on the cracking load and the ultimate load of RC members. The results show that ultimate load increases with the use of CFRP sheets to strengthen the secondary load RC members. The calculation formula is in agreement with the experimental data and provides a tool for engineering design. The study result is useful and can be applied in strengthening secondary load RC members with externally bonded CFRP sheets under axial tension.