Development of a structural health evaluation system for cable bridges by using seismic accelerometers

摘要

A program for structural health monitoring of cable-stayed bridges using seismic accelerometers is developed. Various response indices in monitoring structural safety and serviceability of the bridges are discussed. A systematic approach to process the raw data for generating appropriate response indices is proposed. The system is verified using data sets of a test-bed structure. The program for the structural condition evaluation is composed of four parts each of which corresponds to the major process of the structural health evaluation: (ⅰ) format conversion of the raw data, (ⅱ) noise filtering, (ⅲ) generation of response indices, and (ⅳ) condition evaluation. Decision of limit states included in the condition evaluation step is discussed and an example of the graphic user interface of the program is represented. The analysis procedure and usability of the developed system is presented through the reference application for a cable-stayed concrete girder bridge. It is verified that the adopted filtering algorithm is effective for the filed data from a real bridge.