Early warning method for deterioration of bearing capacity of railway steel truss arched bridge girder

Abstract

The invention discloses an early warning method for deterioration of bearing capacity of a railway steel truss arched bridge girder. The method comprises the following steps that 1, temperature data and strain data are collected; 2, components, influenced by train loads, in the strain data are removed; 3, main components of the temperature data and temperature difference data are extracted; 4, a mathematic model between the main components of the strain data and the main components of the temperature data and the temperature difference data is built; 5, the mathematic model is utilized for calculating a residual error between measured strain data and analog strain data; 6, the bearing capacity of the girder is evaluated through the strain residual error. According to the early warning method, the early warning in the deterioration process of the bearing capacity of the railway steel truss arched bridge girder is achieved, and good project practical value is achieved.

Description

technical field [0001] The invention relates to bridge engineering, in particular to a method for early warning of bridge bearing capacity degradation. Background technique [0002] In long-span bridge structures, the strain is mainly caused by temperature loads. Previous studies have shown that the diurnal and seasonal temperature fields can cause significant strain levels, significantly exceeding those caused by vehicle loads. Therefore, there is a certain correlation between the strain and the temperature load, and this correlation can be used to characterize the bearing performance of the main girder of the long-span bridge structure; of degradation. Researchers have used the correlation between strain and temperature to establish a multiple linear regression model for evaluating the bearing performance of bridge girders. [0003] However, the existing research results have the following defects: (1) The existing research results only focus on the correlation character...

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an early warning method for the degradation of the bearing capacity of the main girder of a railway steel truss arch bridge, which is used to solve the existing research considerations on the correlation between bridge strain and temperature field Inadequately comprehensive and lack of early warning of technical issues

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