DIAGNOSIS OF BRIDGE BEARINGS IN NORTH JAPAN BASED ON FIELD MEASUREMENTS

Bridge bearings are the structural members which are installed at the connection between superstructure and substructure of a bridge, thus it is crucial to maintain bearing functions as structural members. If bearing functions are declined, it is possible for the structure of the whole bridge to be changed and have an effect on functions of superstructure and substructure. Thus, maintaining functions of bearings is not negligible. Generally, "Visual inspection" is indicated as a standard method. However, it is difficult to evaluate the deterioration degree of bearing functions with "Visual inspection" only. Therefore, we have studied to establish a qualitative evaluation method regarding basic functions required for bridge bearings as structural members based on measuring displacement and strain. In this study, measuring displacement and strain in the bridge in north japan was carried out, and evaluating the deterioration degree of bearings with the evaluation method proposed was attempted.

桥梁支座（bridge bearings）是设置于桥梁上部结构与下部结构连接部位的结构构件，因此保障其作为结构构件的功能正常至关重要。若支座功能退化，整座桥梁的结构状态可能发生改变，并影响上部结构与下部结构的工作性能。因此，支座功能的维护工作不容忽视。通常，目视检查（Visual inspection）被作为标准检测方法。然而，仅依靠目视检查难以准确评估支座功能的退化程度。为此，本研究以位移与应变量测为基础，针对桥梁支座作为结构构件所需具备的基本功能，建立了定性评估方法。本研究针对日本北部的一座桥梁开展了位移与应变测量工作，并尝试利用所提出的评估方法对支座的退化程度进行评估。