Method for monitoring overall welded joint fatigue damage of steel bridge deck of highway

Abstract

The invention provides a method for monitoring the overall welded joint fatigue damage of a bridge deck of a highway, which comprises the following steps that: step 1, a strain sensor of a longitudinal rib of the steel bridge deck is arranged, and a bridge-directional strain sensor of the longitudinal rib is arranged at a wheel load application position of each lane of a midspan cross section of the steel bridge deck, and is used for monitoring the bridge-directional strain of the longitudinal rib, which is caused by the passing vehicle; step 2, the strain monitoring data of the longitudinal rib of the steel bridge deck is processed: one day is taken as a computational interval, the strain data which is obtained by the strain sensor of the longitudinal rib is processed, and a rain flow counting method is adopted to calculate the stress amplitude and cycle index of the bridge-directional strain of the longitudinal rib; step 3, the wheel load spectrum of the practical operation vehiclesis calculated; and step 4, the overall welded joint fatigue damage of the steel bridge deck of the highway is monitored. The method effectively solves the problem hat the welded joint fatigue damage monitoring points of the steel bridge deck of the highway are limited, and is necessarily and widely applied and popularized.

Description

technical field [0001] The invention relates to a welding seam fatigue damage monitoring method applied to highway steel bridge decks, and relates to the field of non-destructive testing of bridge engineering. Background technique [0002] The highway steel bridge deck is welded into a whole by three parts: the deck, the longitudinal rib and the transverse rib, which are perpendicular to each other. As the bridge deck system, it directly bears the repeated action of the vehicle load, and the steel bridge deck is prone to fatigue cracking. At present, accidents of steel deck fatigue cracking have occurred in highway steel bridges at home and abroad. The steel bridge decks built in Germany and the United Kingdom in the 1960s suffered fatigue cracking to varying degrees in the 1980s. In China, the Humen Bridge in Guangdong, which was completed and opened to traffic in 1997, has had fatigue cracks in the steel bridge deck since 2003. Therefore, it is necessary to monitor and e...

AI Technical Summary

Problems solved by technology

[0004] technical problem: Aiming at the deficiencies of existing highway steel bridge deck fatigue damage monitoring technology, the present invention proposes a full-field monitoring method for highway steel bridge deck weld fatigue damage, focusing on solving the limitation of limited welding seam fatigue monitoring and measuring points

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