在役轨道交通矮塔斜拉桥检测与评估

Inspection and Evaluation of Low-pylon Cable-stayed Bridges in In-service Rail Transit

摘要:

以某在役轨道交通矮塔斜拉桥的检测与评估为例，通过对矮塔斜拉桥受力特点的分析，确定了定期检测中矮塔斜拉桥的检测重点。主梁、主塔和墩柱的恒载几何形态测量表明，该矮塔斜拉桥整体保持稳定的状态，主梁跨中有沉降的趋势；通过桥梁自振特性、斜拉索索力和动位移的测试，明确了该桥的动力特性和动力响应；通过外观检查，明确了主梁主塔混凝土结构的病害和斜拉索锚头的现状。该项目的检测流程和检测方法可以为类似轨道交通桥梁的检测评定提供参考。

Abstract:

Taking the detection and evaluation of a low-pylon cable-stayed bridge in in-service rail transit as an example, the loading features of the low-pylon cable-stayed bridge are analyzed and the key points of the regular inspection of the low-pylon cable-stayed bridge are determined. The measurement of the dead-load geometry of the main girder, main pylon and pier column shows that the low-pylon cable-stayed bridge remains stable as a whole, and there is a tendency to settle in the middle of main girder. The dynamic features and dynamic response of the bridge are defined through the tests of natural vibration characteristics, stayed cable force and dynamic displacement of the bridge. Through the visual inspection, the defects of the concrete structure of the main girder and the main pylon, and the present situation of the anchor head of the stayed cable are clarified. The inspection process and methods of this project can provide a reference for the inspection and evaluation of similar rail transit bridges.