【摘要】 目的 研究大跨径空心板梁桥铰缝在不同损伤状态下铰缝混凝土劣化指标，为该类梁桥的预养护提供参考。方法 应用MIDAS软件建立有限元分析模型，并通过试验分析不同受损长度及位置下铰缝劣化指标，进而提出新型铰缝检测方案，基于试验提出铰缝劣化指标，结合注环氧树脂加固技术进行铰缝预养护；结合现有桥梁历年检测数据，提出铰缝混凝土服役年限预估方法。结果 提出了劣化指标公式及铰缝混凝土劣化模型，通过铰缝混凝土劣化模型可计算出劣化时间，试验桥梁采取新型检测方案和预养护结合技术后，铰缝混凝土劣化时间延长至未采取措施前的2倍以上。结论 应用新技术可以提前预防铰缝受损，节约维修加固成本，延长寿命，为此类空心板梁桥铰缝的预养护管理和维修加固提供参考。更多还原

【Abstract】 The deterioration index of hinge joint concrete of long-span hollow-slab girder bridge under different damage states is studied, and to provide a reference for the pre-conservation program of this type of girder bridges.The finite element analysis model is established by MIDAS software, the deterioration index of hinge joint under different damaged length and position of hinge joint is studied by experiment, and then a new hinge joint detection scheme is proposed, based on the test, the deterioration index of hinge joint is proposed, combined with epoxy resin injection reinforcement technology, hinge joint pre-maintenance is carried out; Combined with the existing bridge over the years of test data on the hinge joint degradation time, the hinge joint concrete service life prediction method is put forward.The formula of deterioration index and the deterioration model of hinge joint concrete are put forward.through the calculation of the deterioration model of hinge joint concrete, it is concluded that the deterioration time of hinge joint concrete is extended to more than 2 times before the measures are not taken after the test bridge adopts the new detection scheme and the pre-maintenance combined technology.The application of new technology can prevent the damage of hinge joints in advance, save the cost of maintenance and reinforcement, prolong the service life, and provide reference for the pre-maintenance management and maintenance and reinforcement of hinge joints of such hollow-slab girder bridges.更多还原