中文摘要：

在分析使既有钢筋混凝土（RC）桥梁构件承载力下降因素的基础上，通过对这些因素进行无损检测，利用模糊数学和层次分析（AHP）法把这些既相互关联又相互影响的不确定因素系统化，通过模糊隶属函数将定性描述定量化，从而计算出其在这些影响因素下的综合折减系数，再与不考虑损伤的有限元计算结果相结合，采估算既有钢筋混凝土桥梁构件承载力。通过两个实例分析表明：该方法具有良好的可靠性，可为既有桥梁的承载力评估提供科学依据。

英文摘要：

Based on analysis of some factors reducing the carrying capacity of existing RC bridge, authors used fuzzy mathematics and analytic hierarchy process （AHP） to systematize these interrelated and interactional factors after nondestructive examination, quantified qualitative description with fuzzy membership function, and accordingly computed synthetical reduction coefficient, and then finite element result without damage was united with synthetical reduction coefficient to estimate carrying capacity of existing RC bridge members. Reliability of this method was validated by two examples. This method can provide scientific basis for estimation of carrying capacity of existing bridge.