Abstract
The purpose of this work is to clarify the stress-strain state of the superstructure under the influence of solar radiation using the results of a non-contact pyrometer and contact thermometer. Full-scale measurements of the temperature of the superstructure elements with orthotropic slab during daylight at extremely high temperatures and exposure to solar radiation were carried out. Temperature readings on two measuring instruments were taken at the designated points of the asphalt pavement and main beams. Verification of the non-contact pyrometer according to the readings of the contact thermometer was performed. The analysis of the results of full-scale measurements showed that when measuring the temperature of the superstructure elements using a non-contact pyrometer, an error in the results may occur in comparison with a contact thermometer. With the help of a special software package, a detailed temperature distribution was determined by the thickness of the layers of road pavement, orthotropic slab and the height of the main beams for various cases of solar radiation exposure. With the help of the developed finite element model of the superstructure, 2 variants of calculating the stress-strain state were performed: (1) in accordance with the readings of the non-contact pyrometer; (2) in accordance with the readings of the contact thermometer. The results of calculations obtained on the basis of the contact thermometer and non-contact pyrometer are compared. The results of numerical studies have shown that when calculating the stress-strain state of the span structure, there is a discrepancy between the results of the initial data of the pyrometer and the thermometer. In full-scale temperature measurements under the influence of solar radiation to clarify the results, it is recommended to specify the readings of the non-contact pyrometer according to the readings of the contact thermometer.
Highlights
The purpose of this work is to clarify the stress-strain state of the superstructure under the influence of solar radiation using the results of a non-contact pyrometer and contact thermometer
Verification of the non-contact pyrometer according to the readings of the contact thermometer was performed
The analysis of the results of full-scale measurements showed that when measuring the temperature of the superstructure elements using a non-contact pyrometer, an error in the results may occur in comparison with a contact thermometer
Summary
Натурные измерения температуры проводились на пролетном строении L = 43,1 м автодорожного моста через реку Ворона в г. Измерения на объекте проводились в течение светового дня 15 августа 2019 года в 08:30, 10:00, 12:00, 14:30 и 17:00. На каждом этапе были проведены замеры температуры в 3 точках асфальтобетонного покрытия пролетного строения и температура по высоте главных балок при различных температурах воздуха и положениях солнца. Измеряемые элементы пролетного строения представлены на рис. Измеряемые элементы пролетного строения: а) асфальтобетонное покрытие; б) главные балки. Измерение температуры выполнялось с использованием двух приборов Диапазон измерения температуры составляет -20 °С...1000 °С (±2 %). Приборы для измерения температуры элементов пролетного строения: а) пирометр Мегеон 16400; б) термометр РМ838. 4 приведен график изменения температуры в течение светового дня 15 августа 2019 года На рис. 4 приведен график изменения температуры в течение светового дня 15 августа 2019 года
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