Abstract: From 1960s to 1990s, a large number of double-curved arch bridges and truss composite arch bridges were built in China. Serious diseases occurred during operation, and many arch bridges were forced to be reinforced or demolished and reconstructed. However, the reinforcement or demolition of arch bridges involved many factors, such as technology, economy, society and resources. The current studies usually only considered the technical status of bridges, and it was difficult to make a scientific and reasonable decision-making scheme. In view of the shortcoming of the singularity of decision-making factors, according to the diseases of double-curved arch bridge and truss composite arch bridge, the evaluation index system including “technical category, social category and economic category” was constructed from the aspects such as technical status, social development, national policy, government behavior, social resources and life cost. Based on rough set theory, a comprehensive judgment model for the reinforcement or demolition scheme of concrete arch bridge was established, which had rigorous calculation logic, simple index weight determination and accurate judgment results. And the proposed model was applied to Huayudong Bridge in Guizhou Province. The results show that the proposed evaluation index system can objectively carry out the comprehensive judgment of the reinforcement or demolition scheme of the concrete arch bridge and verify the feasibility of the comprehensive judgment model.

Key words: bridge engineering; concrete arch bridge; reinforcement or demolition; evaluation index system; rough set theory; comprehensive decision model

摘要： 20世纪60年代至90年代，国内建造了数量众多的双曲拱桥和桁式组合拱桥，使用过程中出现了较为严重的病害，不少拱桥进行了加固改造或拆除重建。然而，拱桥的加固或拆除涉及到技术、经济、社会、资源等多种因素，现有研究通常只考虑桥梁技术状况，难以做出科学合理的决策方案。针对决策因素单一性的不足，根据双曲拱桥和桁式组合拱桥的病害，从技术状况、社会发展、国家方针、政府行为、社会资源、寿命成本等方面构建了包含“技术类、社会类、经济类”的评判指标体系；运用粗糙集理论，建立计算逻辑严谨、指标定权简便、判定结果准确的混凝土拱桥加固或拆除方案综合判定模型，将其应用于贵州省花鱼洞大桥中。研究表明：建立的评判指标体系，能够客观地开展混凝土拱桥加固或拆除方案综合判定，验证了综合判定模型的可行性。

关键词: 桥梁工程；混凝土拱桥；加固或拆除；评判指标体系；粗糙集理论；综合判定模型