适用于扩展有限元裂缝计算的钢筋与混凝土粘结滑移关系

以定量分析钢筋与混凝土粘结滑移关系为目标,利用RCXFEHohai-P扩展有限元程序,计算采用不同粘结滑移公式时钢筋混凝土简支梁的最大裂缝宽度。结果表明,计算所得最大裂缝宽度各不相同,且都与《混凝土结构设计规范》(GB 50010—2010)所列最大裂缝宽度公式计算值存在差别。为此,基于GA-BP神经遗传网络,以规范最大裂缝宽度公式计算值为预测目标,反演得到适用于扩展有限元裂缝计算的粘结滑移公式,算例表明该公式能满足扩展有限元裂缝宽度计算要求。研究成果对提高扩展有限元裂缝分析的准确性具有一定的参考价值。

Bond-slip relationship between reinforcement and concrete applicable to extended finite element calculation of crack

By taking the quantitative analysis of the bond-slip relationship between reinforcement and concrete as the objective，the maximum crack widths of a reinforced concrete simply supported beam obtained from various bond-slip formulas are calculated with the extended finite element program RCXFEHohai-P herein. The results show that the maximum crack widths from the calculations are different，and all are different from the calculated values from the formulas listed in the Code for Design of Concrete Structures（GB 50010—2010） as well. Therefore，based on GA-BP genetic neural network，a bond-slip formula applicable to the extended finite element calculation of cracks obtained with the relevant inversion by taking the calculated value of the maximum crack width from the formula listed in the code as the predicted target. The calculated case shows that the formula can meet the requirement of the calculation on the extended finite element calculation of crack. The study result has a certain reference value for enhancing the accuracy of the analysis made on the extended finite element calculation of crack.