中文摘要：

鉴于现行桥梁技术状态评定方法未体现评定过程模糊性和随机性的不足，本文将云重心评价理论及劣化模型引入到桥梁技术状态评定当中，在桥梁技术状态的云划分方法的基础上，分别建立各层级结构与构件的云模型，将桥梁技术状态划分为5个云图，建立基于云重心理论的桥梁技术状态评定方法，获得了桥梁技术状态劣化模型，对南宁大桥采用云重心方法及现行规范方法进行详细的技术状态评价，研究表明，本文提出的方法与规范方法评估结果等级相同，但本文提出的模型同时考虑了桥梁技术状态评定过程中的随机性和模糊性，在桥梁技术状态评定中具有很高的可信度和广泛的适用性。

英文摘要：

Current evaluation methods for bridge technical condition often fail to reflect the fuzziness and stochastieity during the evaluation process, so the Cloud Barycenter Theory and the deterioration model are introduced to conquer the shortcomings. The cloud models of every hierarchy and every member are built respectively based on the Cloud Partition Method, and the bridge technical condition are divided into five clouds. The evaluation method based on the Cloud Barycenter Theory is developed and the deterioration model of bridge technical condition is obtained. Detailed technical condition evaluation is conducted on the Nanning Bridge by the proposed evaluation methods based on Cloud Barycenter Theory and current standards, respectively. The study results show that the final condition grade evaluated by the proposed method by this thesis agrees well with the method provided in current standards. However, the biggest difference is that the model built herein gives consideration to the fuzziness and randomness during the evaluation process, which shows higb reliability and wide applicability of the proposed bridge technical condition assessment method.