Abstract: Structure disease of concrete at upper part of common highway bridge is the key factor for maintenance and evaluation of bridge.Based on the analysis of 125common highway bridges with concrete girder structure in Tianjin City,the types of diseases,reasons and maintenance methods are analyzed in this paper.The research results show that the proportion of slab girder bridge,T girder bridge and box girder bridge is 70.4%,20.7%and 8.9%respectively.Six main disease types and seven main maintenance methods for common highway concrete bridges are summarized.The common disease of slab girder bridge is transverse crack at the bottom of girder with more than 61.1%incidence.And the common disease of T girder bridge and box girder bridge is vertical or oblique crack at the belly of girder with incidence of 64.3%and 75%,respectively.The most common maintenance method of slab girder is to repair in part,the utilization ratio of such method is up to 66.3%.The common maintenance method of T girder and box girder is deck reinforcement and fracture sealing,the utilization ratio is up to 50%and 83.3%,respectively.The research results show that the disease type incidence and maintenance method utilization of bridge are closely related with the structure forms of bridge.These research results will provide the reference for maintenance and reinforcement of bridge.

Key words: highway bridge, concrete, plate girder, T girder, box girder, disease type, maintenance and reinforcement

摘要： 普通公路混凝土桥梁上部结构病害研究是桥梁维修与效果评价的重要依据,以天津市辖区125座普通公路混凝土桥梁为例,研究分析病害类型、病害原因以及维修加固方法。研究结果表明:板梁桥、T梁桥和箱梁桥占比分别为70.4%,20.7%,8.9%;普通公路混凝土桥梁病害主要有6种类型,维修方法主要有7种;板梁常见病害是梁底出现横缝,发生率高达61.1%,而T梁、箱梁常见病害是梁体腹部出现竖、斜向裂缝,发生率分别为64.3%和75%;维修板梁使用率最高的方法是局部修复法,使用率为66.3%,维修T梁、箱梁常用方法分别是桥面补强法和封缝处理法,使用率分别为50%和83.3%。研究结果还表明每种类型病害发生率和维修方法使用率与桥梁结构形式均密切相关,这将为以后桥梁维修加固提供借鉴和参考。

关键词:  , 公路桥梁, 混凝土, 板梁, T梁, 箱梁, 病害类型, 维修加固