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中文摘要：
摘要：对碳纤维加固复合受力的钢筋混凝土箱粱进行应力分析。针对扭剪比较大的矩形箱梁构件，在斜压场理论的基础上，考虑混凝土软化的影响，提出了弯剪扭复合受力下碳纤维加固钢筋混凝土箱梁受力分析的计算理论，推导了相应的计算公式，编制了相应的计算机程序，并对4根碳纤维加固复合受力钢筋混凝土箱粱抗扭性能试验模型进行了数值分析。通过理论计算值与试验测试值的对比分析可以看出，各箱粱试件单位长度扭转角的试验测试值与理论计算值的比值的平均值为0．846～1．064，均方差为0．071～0．177；各箱梁试件底部纵筋应变的试验测试值与理论计算值的比值的平均值为0．946～0．997，均方差为0．051～0．093，即理论计算值与试验测试值吻合较好。由此得出结论，所建立的碳纤维加固钢筋混凝土箱梁受力分析的计算理论是合理可行的，能较好地反映碳纤维加固钢筋混凝土箱粱的复合受力情况。
英文摘要：
The stress analysis of carbon fiber sheet （CFS） strengthened reinforced concrete （RC） box girders subjected to combined loadings is conducted. Based on the diagonal-compression-field theory considering concrete softening, the stress analysis method of CFS strengthened RC box girders under the combined loadings of the bending moment, shear force and torque is established, the corresponding computer program was developed, and the numerical investigations of four experimental models of CFS strengthened RC box girders subjected combined loadings were carded out. The comparisons of the calculated and the experimental results shows good agreement, the average ratios of the experimental and calculated results of the torsion angle within unit length of the specimens range from 0.846 to 1.064, and its mean square deviations range from 0.071 to 0.177; the average ratios of the experimental and calculated results of the strains in the longitudinal bars range from 0.946 to 0.997, and its mean square deviations range from 0.051 to 0.093. The established stress analysis method is reasonable and feasible for CFS strengthened RC box girders subjected to combined loadings.
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