Highway steel bridge fatigue analysis method based on actually measured stress spectrum

Abstract

The invention relates to the technical field of the road bridge engineering detection, and discloses a highway steel bridge fatigue analysis method based on an actually measured stress spectrum. The technical problem that the strain detection data collected through the current actual measurement method has multiple idle clutter is solved. The method comprises the following steps: S1, acquiring data; S2, processing a strain data signal: S21 filtering; S22, peak value extracting; S23, small stress circular filtering; S24, base line drift processing; S3, performing rain-flow method stress circular counting, thereby obtaining stress spectrum through the rain-flow method counting; and S4, evaluating a fatigue problem by utilizing a fatigue life evaluation theory, and computing fatigue damage and residual life of each measurement point. According to above technical scheme, the fatigue strain monitoring data is acquired and collected through an actual measurement method, and then the filtering, the peak extraction, the small stress circular filtering and the baseline drifting processing and like operations are performed on the acquired fatigue strain monitoring data, and finally, the fatigue damage and the residual life of each measurement point are computed, thereby reaching an aim of improving the evaluation accuracy and reliability.

Description

technical field [0001] The invention relates to the technical field of road and bridge engineering detection, more specifically, it relates to a fatigue analysis method of a road steel bridge based on a measured stress spectrum. Background technique [0002] With the increase of the service time of highway steel bridges in our country, in order to ensure the structural safety of steel structure bridges, based on the measured fatigue strain data, the stress spectrum acquisition and fatigue life analysis of highway steel bridges are studied. Although the fatigue properties of traditional steel materials used to build bridges have been thoroughly studied, fatigue failures of bridges still occur frequently. Cause heavy casualties and huge economic losses. [0003] In order to measure the remaining life of bridges, at present, most countries adopt traditional fatigue analysis methods in the design of bridges. The traditional fatigue analysis method is based on the S-N curve (al...

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Problems solved by technology

[0004] However, in the actual application process of the above-mentioned actual measurement method, according to engineering experience, the strain monitoring signal collected by the actual measurement method is easily interfered by various factors at the acquisition site, and contains a large number of invalid clutter that does not belong to the structural response, making the fatigue life Poor assessment accuracy and low reliability

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