【作者】 冯鹏； 齐玉军； 叶列平；

【Author】 Peng Feng Yujun Qi Ye Lieping (Department of Civil Engineering,Tsinghua University Beijing 100084)

【机构】 清华大学土木工程系；

【摘要】 由于 FRP(纤维增强复合材料)的线弹性受力特征使得 FRP 加固钢筋混凝土梁的受力性能与普通钢筋混凝土梁有所不同,出现了明显的屈服后刚度,这就使得原有适用于钢筋混凝土构件的设计方法和性能指标不再适用于 FRP 加固钢筋混凝土梁。本文分析了传统结构的安全储备需求,提出了基本安全储备和附加安全储备的概念,进而定义了基本承载力安全储备系数和等效承载力安全储备系数;基于对已有结构设计规范中安全储备的分析,建议了安全储备指标的取值;通过对 FRP 加固钢筋混凝土梁的数值分析和设计计算,指出了目前基于 FRP 加固钢筋混凝土梁极限状态点的设计方法可能存在的不足,并建议在实际设计中应采用本文中安全储备指标进行复核。更多还原

【Abstract】 Due the linear elastic performance of FRP(fiber-reinforced polymer),the mechanical behavior of RC (reinforced concrete)beam strengthened with FRP is different with that of the normal RC beam,which is the considerable post-yield stiffness of the former.So the design methodology and the performance factors for RC beam are not suitable to RC beam strengthened with FRP.The concepts of basic safety storage and additional safety storage are presented based on analyzing the safety storage demand of traditional structures,and equivalent strength factor and basic strength factor are proposed.The value of the factors is determined by analyzing the existing standards for traditional structures.Then,the shortage of the existing design method for RC beams strengthened with FRP which is based on the ultimate state is indicated.It is suggested to check the safety storage with the proposed factors for design.更多还原