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为合理评估既有RC拱桥的承载能力,对损伤后拱肋最不利车载效应的变化问题进行了研究。采用机动法分析了拱肋区段刚度损伤后各典型截面弯矩和轴压力影响线的变化情况。在此基础上,按照现行公路桥涵设计通用规范中的车道荷载布置方式,并结合正交试验设计方法,研究了具有不同拱轴系数、矢跨比和跨度参数的无铰拱肋各典型截面的不利弯矩和轴压力值随损伤程度的变化规律。结果表明在无铰拱肋中各截面不利轴压力值随损伤程度的变化不大,而不利弯矩值则有较大变化;当损伤程度相同时,拱顶截面不利负弯矩对应的变化系数值最大,而拱脚截面不利正、负弯矩对应的变化系数值相当,且数值也较大。
In order to reasonably evaluate the bearing capacity of existing RC arch bridge and study the problem of the most unfavorable in-vehicle effect of arch ribs after damage, The influence of bending moment and axial pressure on the typical cross-section after arch rib section stiffness damage was analyzed by using the maneuvering method. On the basis of this, according to the layout of the lane load in the current general rules for the design of highway bridges and culverts, combined with the orthogonal experimental design method, the typical sections of the non-hinged arch ribs with different arch coefficient, ratio of span to span and span parameters Adverse bending moment and axial pressure with the degree of damage changes. The results show that the unfavorable axial pressure values vary little with the degree of damage, but the unfavorable bending moment values change greatly in the non-hinge arch rib. When the degree of damage is the same, the coefficient of variation of adverse negative bending moment The value of the maximum, while the arch foot cross-section negative positive and negative moments corresponding to the value of the coefficient of change quite large, and the value is large.