Method for measuring temperature correction factor of bridge fatigue life gage

Abstract

The invention discloses a method for measuring the temperature correction factor of a bridge fatigue life gage, comprising the following steps: sticking a test fatigue life gage on a standard fatigue test piece prepared from a material to be measured; arranging in an environmental chamber; at the temperature of miuns 20-60DEG C, adjusting the temperature of the environmental chamber; measuring the real-time resistance value Ri of the test fatigue life gage of each temperature point; taking the resistance value of the fatigue life gage, which is measured at 20DEG C, to serve as a reference resistance value R; setting the rectangular Cartesian coordinate system by taking temperature as the abscissa and the resistance variation rate as the ordinate; obtaining the discrete distribution graph of the resistance variation rate data points of different temperature points; carrying out curve fitting to the discrete data points by a cubic polynomial; calculating the coefficient of each item in the cubic polynomial so as to obtain the generate cubic polynomial phi (Tj) of the corresponding material; according to the temperature correction factor S=phi(Tj)*R of the bridge fatigue life gage, calculating the temperature correction factor S of the corresponding temperature point of the material to be measured; and correcting R obtained in the practical engineering. According to the monitored material, the temperature correction factors of the bridge fatigue life gage are respectively measured with the method, the method is directly applied to the practical engineering, the on-site tests become simple and convenient, and engineering applicability is strong.

Description

A Measuring Method of Temperature Correction Coefficient of Bridge Fatigue Life Meter technical field The invention relates to a method for measuring the temperature correction coefficient of a bridge fatigue life meter, which is used for temperature compensation of the bridge fatigue life meter. technical background In 1966, there was a report on the study of fatigue life meter abroad, which immediately attracted great attention. DarrellR.Harting focuses on the automatic accumulation of resistance along with the fatigue history in the paper - the inherent characteristic of this fatigue life meter. In 1972, RoberS.Horne and OscarL.Freyre introduced the resistance fatigue cumulative performance of the fatigue life meter made of special annealed constantan foil and the experimental method of calibrating the resistance fatigue cumulative performance curve of the life meter in their research report, including Test equipment, test process, load control method, etc. In the re...

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Problems solved by technology

From the above review, it can be seen that the existing research on fatigue life sensing elements basically does not consider the special use environment of civil structures such as bridge structures. frequently

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