中文摘要：

通过构建以不规则五边形最小面积为特征向量的评价函数,将对既有钢筋混凝土拱肋承载力的定性描述定量化,并利用雷达图推算出承载力评定的检算系数Z1的标度评价值,有效地消除了各项因素之间的线性关系。基于最小二乘法拟合了检算系数Z1与其标度评价值之间的曲线方程。用检算系数Z1对不考虑损伤的有限元计算结果进行修正,获得承载力评定值,并对两片服役多年的既有钢筋混凝土拱肋的承载力开展试验研究。结果表明,承载力评定值与试验结果吻合较好,可为既有钢筋混凝土拱肋的承载力评估提供科学依据。

英文摘要：

For evaluating bearing capacity of existing reinforced concrete arch rib accurately and making qualitative description quantitatively,the evaluation function was established by using a minimum area of irregular pentagon as its eigenvector.The scale value of checking coefficient Z1 for evaluation of bearing capacity was calculated by radar chart to eliminate the linear relationship between the factors effectively.Using the least square method,the curve equation of the value of checking coefficient Z1 to its scale value was fitted.Checking coefficient Z1 was used to modify the finite element result without regard to damage,and the evaluation value about bearing capacity was obtained.Experiment study of bearing capacities of two existing reinforced concrete arch ribs which served for many years was carried out.The results show that the value of evaluation of bearing capacity is in good agreement with the experimental result.This method can provide scientific basis for evaluation of bearing capacity of existing reinforced concrete arch ribs.