预应力碳纤维加固RC梁的可靠度分析  

Reliability analysis of RC beams strengthened with prestressed CFRP

作　　者：刘扬[1] 沈维成[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《交通科学与工程》2012年第1期35-39,88,共6页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(50608009);教育部新世纪优秀人才支持计划(2009);交通部应用基础研究项目(2006319825070)

摘　　要：目前,加固后桥梁结构的安全分析主要采用有限元等确定性分析方法,没有考虑变量的变异性.在已有研究的基础上,建立了预应力碳纤维加固RC梁的极限状态方程;运用改进的重要抽样法,对预应力碳纤维加固结构进行了可靠指标计算.计算结果表明:该算法能较好地提高解的精度;通过参数敏感性影响分析可知,抗力设计变量中,h0的均值和fy的变异系数对结构可靠度的影响最为显著,同时,可靠度指标还随着CFRP的弹性模量和截面面积的均值的增大而增大.With the exception of a few studies, most of the studies conducted on CFRP- strengthened structures have been done by using finite element analysis method, and statistical variability of the variables have been largely ignored. This paper presents a method of reliability study of such structures. The limit state function of RC beams strengthened with prestressed CFRP is given. And the improved sampling method is proposed to calculate the reliability index, which shows its accuracy. Parameter sensitiv- ity analysis shows that the mean of h0and variation coefficients of fyhave the most im- portant effects on structural reliability. Meanwhile, the reliability index also respectively increases with the increase of CFPR＇s elastic modulus and the cross-sectional area.

关 键 词：预应力碳纤维 可靠度指标 改进重要抽样法 结构抗力 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]