摘要
针对CFRP加固混凝土梁配布(筋)率优化问题,提出了在考虑材料价格的基础上,采用基于应变协调条件和加固混凝土梁正截面受弯承载力的计算方法,利用拉格朗日函数推导出了配布(筋)率优化表达式,并分别运用Excel软件和预算模拟软件进行分析.结果表明:优化配布(筋)率与弹性模量之比、价格之比、抗拉强度之比有关;纤维复合材料的加固量一般在2~5层;当钢筋级别较高、混凝土强度等级较低(C20)时,不宜用碳纤维布加固,这与《混凝土结构加固设计规范》(GB50367-2013)规定较符合.
Aiming at the optimization of the ratio of sheet to reinforcement in concrete beams reinforced with the carbon fiber reinforced polymer(CFRP)and on the basis of considering the material price,a calculation method based on the strain coordination conditions and the cross-sectional flexural bearing capacity of reinforced concrete beams was proposed.The optimization formula of the ratio of sheet to reinforcement was derived with the Lagrange function,and both Excel software and budget simulation software were used for the analysis.The results show that the optimization of the ratio of sheet to reinforcement is related to the ratios of elastic modulus,price and tensile strength,and the reinforcement amount of fiber composite material is usually from 2 to 5 layers.When the reinforcement level is higher and the concrete strength level is lower(C20),CFRP is not suitable for reinforcement,which accords with the rules in the code for design of strengthening concrete structure(GB50367-2013).
作者
刘相
崔熙光
LIU Xiang;CUI Xi-guang(School of City Construction,Eastern Liaoning University,Dandong 118003,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2018年第6期713-720,共8页
Journal of Shenyang University of Technology
基金
辽宁省教育厅科学研究一般项目(L2015187)
关键词
碳纤维布(CFRP)
加固
混凝土梁
配布(筋)率
优化
拉格朗日函数
造价
预算模拟软件
carbon fiber reinforced polymer
reinforcement
concrete beam
ratio of sheet to reinforcement
optimization
Lagrange function
cost
budget simulation software
