摘要
纤维增强复合材料(FRP)加固钢筋混凝土(RC)圆柱可以有效提高其抗震性能。本文研究地震荷载作用下FRP用量对加固圆柱变形能力的影响。运用数值计算方法对加固柱截面曲率进行计算,发现FRP用量对屈服曲率影响很小,但对极限曲率有显著的影响。试验结果显示,加固柱顶点侧向位移角并不随FRP加固用量的增加一直增加,当FRP用量达到一定值后进一步增加会降低侧向位移角。理论分析表明,这是由于加固柱塑性铰长度也受FRP用量的影响,随着FRP用量的增加塑性铰长度变小。最后讨论了具有良好加固效果的FRP用量上限范围。
Fiber reinforced polymer（FRP） have great efficiency to retrofit circular reinforced concrete（RC） columns under simulated seismic loading.In this paper,the impact of the FRP amount to the deformation capacity of the retrofitted columns is studied.The sectional curvature is calculated with numerical analysis method.It is found the FRP amount has very limited influence to sectional yield curvature,however,the ultimate curvature can be significantly influenced.The test results demonstrate that the ultimate drift ratio does not always increase with an increase of the amount of FPR.The peak of the ultimate drift ratio is attained at a critical value of the amount of FPR,after which the ultimate drift ratio can be decreased with an increase in the amount of FPR.This is because the plastic hinge length of retrofitted columns can also be influenced by the amount of FRP,and it will decrease with an increase of the amount of FRP.Then the upper bound of the amount of FRP for an efficient retrofit is discussed.
出处
《工程抗震与加固改造》
北大核心
2010年第5期79-84,共6页
Earthquake Resistant Engineering and Retrofitting
基金
国家"937"计划项目(2007CB714200)
国家自然科学基金资助项目(50608015
50908102)
东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题资助项目
关键词
FRP约束
加固
延性
侧向位移
FRP confinement
retrofitting
ductility
drift ratio
