为更加准确、可靠地掌握斜拉桥的整体技术状况，提出了一个基于层次证据推理框架的桥梁状态评估方法。首先将斜拉桥指标体系分为 3 个层次，第 1 层为桥梁总体状态，第 2 层分为一级、二级、三级和交通安全部件，底层为实际检测指标; 接着将底层指标信息转换为证据，且指标证据的可信度考虑了桥梁要素的重要性和采集数据的可靠性; 然后通过 Dempster-Shafer 组合规则进行融合，以传递整个模型中偶然和认知的不确定性，并得出一级、二级、三级和交通安全部件指标以及桥梁整体状态指标; 最后以一座独塔斜拉桥为例，验证所提证据推理框架的合理性。结果表明: 基于 Dempster-Shafer 规则的组合在归一化过程中丢失的数据较少，更具应用价值; 指标可靠性系数修正了桥梁评估中的主观判断误差，使评估结果更偏于保守且客观; 所建立的桥梁评估方法提供了更准确、详细的桥梁子部件状况，也可用于桥梁群的状态等级排序。

A bridge condition assessment method based on hierarchical evidence reasoning framework was proposed to help understand the overall technical condition of cable-stayed bridges． Firstly，the index system of cable-stayed bridge was divided into three levels． The first level is the bridge overall condition，the second level is primary，se-condary，tertiary and traffic safety components，and the bottom level is the actual detection index． Then，the under-lying index information was transformed into evidence，and the reliability of index evidence considered the impor-tance of bridge elements and the reliability of collected data． Afterwards，the Dempster-Shafer combination rule was fused to convey the accidental and cognitive uncertainty in the whole model，and the primary，secondary，tertiary and traffic safety component indicators as well as the overall state indicators of the bridge were obtained． Finally，the rationality of the proposed evidential reasoning framework was validated by a single-tower cable-stayed bridge．The results show that: the combination based on Dempster-Shafer rule loses less data in the normalization process thus more applicable; the index reliability coefficient corrects the subjective judgment error in bridge evaluation，making the evaluation result more conservative and objective; the established bridge evaluation method can provide
more accurate and detailed status of bridge sub-components，and can also be used for bridge group status ranking．