【摘要】 为完善CFRP布加固混凝土梁裂缝宽度计算方法,一方面基于粘结-滑移理论,对CFRP布加固混凝土梁的裂缝间距和宽度公式进行推导,提出了适用于计算CFRP布加固钢筋混凝土梁和有粘结预应力混凝土梁裂缝宽度的理论分析方法;另一方面又按照传统钢筋混凝土结构裂缝分析思路,在平均裂缝宽度lm计算公式中引入CFRP布和有粘结预应力筋影响项,在裂缝宽度wm计算公式和钢筋应力不均匀系数ψ的计算公式中引入考虑CFRP布和有粘结预应力筋作用的影响系数δf,并给出相应半理论半经验公式.两种分析方法的计算结果与试验结果吻合较好.更多还原

【Abstract】 In order to improve the calculation method of creak width of concrete beams strengthened with CFRP sheet,based on the theory of bond-slippage,the calculation formulas for the crack spacing and width of concrete beam strengthened with CFRP sheet are derived,and theoretical calculation method for the crack width is presented,which is suitable for concrete and prestressed concrete beams strengthened with CFRP sheet.On the other hand,following the traditional idea of crack width of reinforced concrete structures,the influence coefficients considering the CFRP sheet and the bonded prestressing steel are introduced in the calculation formula of the average crack width l m.The influence coefficient δ f considering the CFRP sheet and the bonded prestressing steel is introduced in the calculation formula of crack width w m and the calculation formula of coefficient of uneven stress of steel bar ψ,and the corresponding semi-theoretical-semi-empirical formula is given.The calculation results in above two methods are in good agreement with the test results.更多还原