CFRP加固钢筋混凝土梁极限承载力的试验研究和理论分析
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摘要
随着粘贴碳纤维片材加固技术在土木工程中的广泛应用，国内外众多学者对加固后混凝土结构的极限承载力进行了大量的实验研究和理论探索。本文对七组采用不同CFRP粘贴方式的钢筋混凝土梁进行了破坏加载试验研究，并在徐兴教授提出的三维虚拟层合单元思想的基础上，进一步提出分块破坏分析方法，通过自编的计算程序对这些CFRP加固试验梁的极限承载力进行了三维非线性有限元分析，承载力的实测与计算结果比较表明，二者符合得令人满意。分析中采用载荷增量法，对各级载荷下单元中破坏的材料分块进行弹模折减处理，并重新生成单元刚度矩阵，经过多次迭代直至计算收敛，从而可以给出各类CFRP加固混凝土结构的载荷—变形全过程曲线，并预测其极限承载力。由于此法具有单元少、计算效率高、收敛快和准确性好的特点，因此在CFRP加固混凝土桥梁以及其它复杂的混凝土结构的极限承载力理论研究中将有广泛地应用前景。
When the reinforced technique with bonded carbon fiber reinforced plastic materials is widely applied in the civil engineering, many scholars have investigated the ultimate bearing capacities of the reinforced concrete structure strengthened by CFRP sheets. The paper carried out an experiment upon ultimate bearing capacities of the seven pieces of reinforced concrete beams strengthened by CFRP sheets. On the base of the method of three-dimensional virtual laminated element brought forward by Professor Xu Xing, this paper proposes further the method of element block damage analysis and analyzes those experimental beams by my own programs. The comparison between the calculating and experimental results shows that they have a good agreement. In the paper, the load incremental method is adopted. By the way of reducing the elastic model of the destructive blocks in the elements, the finite element analysis model is revised and the repeated computing process doesn't finish until the results are converged. The proposed method can simulate the entire process of concrete structures from crack to complete damage. Because that the proposed method has so many merits such as the fewer elements, the higher computational efficiency, the higher computational precision, and good convergence, it should have extensive applied foreground in the ultimate bearing capacities' researches of the bridge strengthened by CFRP sheets and the other complex concrete structures. Those research findings can be consulted in the engineering practice and design of concrete structure strengthens.
When the reinforced technique with bonded carbon fiber reinforced plastic materials is widely applied in the civil engineering, many scholars have investigated the ultimate bearing capacities of the reinforced concrete structure strengthened by CFRP sheets. The paper carried out an experiment upon ultimate bearing capacities of the seven pieces of reinforced concrete beams strengthened by CFRP sheets. On the base of the method of three-dimensional virtual laminated element brought forward by Professor Xu Xing, this paper proposes further the method of element block damage analysis and analyzes those experimental beams by my own programs. The comparison between the calculating and experimental results shows that they have a good agreement. In the paper, the load incremental method is adopted. By the way of reducing the elastic model of the destructive blocks in the elements, the finite element analysis model is revised and the repeated computing process doesn't finish until the results are converged. The proposed method can simulate the entire process of concrete structures from crack to complete damage. Because that the proposed method has so many merits such as the fewer elements, the higher computational efficiency, the higher computational precision, and good convergence, it should have extensive applied foreground in the ultimate bearing capacities' researches of the bridge strengthened by CFRP sheets and the other complex concrete structures. Those research findings can be consulted in the engineering practice and design of concrete structure strengthens.
引文
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